<div><p><strong>Purifying the target protein is crucial for investigating its specific properties and interactions with biomolecules like DNA, RNA, and other proteins. A range of purification strategies is available, and the optimal approach depends on factors such as the required scale, throughput, and downstream application. In many cases, the process must be fine-tuned through empirical optimization to achieve the desired purity and yield.</strong></p></div><div><div><div><div><h3><strong>What is Protein Purification?</strong></h3><p>Protein purification is a critical process in biotechnology and life sciences, aimed at isolating a specific protein from complex biological mixtures such as cell lysates or tissue extracts. The goal is to obtain a highly purified protein sample, free from contaminants like other proteins, nucleic acids, and lipids, to enable accurate analysis of its structure, function, and interactions.</p><p>This process is especially vital in biotechnological areas inside immunology and microbiology. In <strong>immunology</strong>, it underpins the production of vaccines, therapeutic antibodies, and diagnostic assays by enabling the isolation of key immune proteins and antibodies. It also supports the investigation of cell signaling and immune response mechanisms. In <strong>microbiology</strong>, purified proteins are essential for studying pathogens, identifying disease-related antigens, and driving drug discovery efforts. Ultimately, protein purification is fundamental to the development of targeted vaccines, innovative diagnostics, and effective therapeutic strategies.</p></div></div></div></div><div><div><div><div><h3><strong>Types of Protein Purification Methods</strong></h3></div></div></div></div><div><p>There are several types of protein purification methods, each chosen based on the protein’s characteristics such as size, charge, solubility, and binding affinity. Below are some commonly used methods:</p></div><div><div><div><div><h4><strong>Non-Chromatographic Approaches</strong></h4></div></div><div><p>Non-chromatographic approaches use simpler physicochemical principles—such as solubility, molecular size, or diffusional properties—to separate and purify proteins. These techniques are often employed as initial purification or concentration steps before further refinement.</p><h5><strong>Precipitation Techniques</strong></h5><p>Protein precipitation is a widely used approach in purification workflows, typically relying on one of three main methods:</p><ul><li><strong>Organic solvent precipitation</strong> involves adding solvents like ethanol or acetone to lower the solution's dielectric constant. This promotes protein–protein interactions, reducing solubility and leading to aggregation and precipitation.</li><li><strong>Isoelectric point precipitation </strong>exploits the pH at which a protein carries no net charge. At this point, solubility is minimized, causing the protein to precipitate from solution.</li><li><strong>Nonionic polymer precipitation</strong> uses polymers such as dextran, polyethylene glycol (PEG), or NPEP to alter the solution’s physical properties. These agents create crowding effects that promote protein aggregation without directly binding to the proteins.</li></ul><h5><strong>Dialysis</strong></h5><p>Dialysis involves placing a protein solution inside a semi-permeable membrane that allows water and ions to pass while the protein remains inside, facilitating buffer exchange.This method is commonly used during protein expression and purification workflows for buffer exchange, desalting, and removal of unwanted small molecules such as imidazole, urea, or ammonium sulfate. The process helps maintain protein stability and activity by gradually equilibrating the sample with the desired buffer conditions.</p><h5><strong>Immunocapture (Magnetic Bead-Based Purification</strong></h5><p>Immunocapture uses antibodies immobilized on solid supports like magnetic beads to selectively bind and isolate a target protein. This method is highly specific and particularly useful for low-abundance targets or small-scale prep, such as:</p><ul><li>Pulling down proteins from complex mixtures</li><li>Capturing tagged recombinant proteins (e.g., FLAG, HA, or His tags)</li><li>Enrichment before western blotting, MS, or ELISA</li></ul><p>Magnetic beads offer speed, ease of use, and minimal sample loss, making them ideal for lab-scale workflows.</p><p><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/products/biozenspe-sample-preparation-products/biozen-magbeads">Biozen MagBeads</a> provide a fast and efficient method for purifying, isolating, and cleaning up monoclonal antibodies (mAbs), proteins, and peptides. These paramagnetic beads feature a streptavidin-coated surface, enabling high-affinity binding in immuno-based workflows. Compared to traditional sample preparation techniques, magnetic bead-based immunocapture offers greater speed and consistency by delivering high binding capacity with uniform particle size, ensuring accurate and reproducible results in significantly less time.</p><h5><strong>Centrifugation</strong></h5><p>Centrifugation of crude protein mixtures is an essential step in the investigation of protein purification and aggregation. Outlined below are the various types of centrifugations employed in protein purification.</p><p><strong>Preparative Ultracentrifugation</strong><br>Ultracentrifugation is an effective method of purifying proteins from aggregates based on their size, shape and density. Centrifugation, widely recognized as a robust and versatile method, is commonly used to separate complex mixtures of cellular components. Ultracentrifuges separate small particles by spinning at high speeds, utilizing centrifugal force based on size and density.</p><p><strong>Differential Centrifugation</strong><br>Differential centrifugation operates by separating components based on differences in size and density, using varying speeds of centrifugation to achieve this. Its resolving power ranges from low to medium. A key advantage of this technique is its convenience for processing multiple samples simultaneously, making it effective for purifying crude samples. Additionally, it preserves cell viability and maintains the natural distribution of hematopoietic cell populations.</p><p><strong>Rate-zonal Gradient Centrifugation</strong><br>This technique separates components based on their sedimentation rate within a medium that contains a density gradient. It offers medium resolving power and is particularly effective for separating multiple components in complex mixtures with high precision. It is also considered a cost-effective and widely used technique in molecular biology and biochemistry.</p><p><strong>Isopycnic Centrifugation (Equilibrium Centrifugation)</strong><br>Isopycnic centrifugation is an advanced protein purification method that relies on the principle of separating particles according to their intrinsic buoyant density, irrespective of their size or morphology. During the process, proteins migrate through a density gradient until they equilibrate at a position where their density matches that of the surrounding medium, resulting in precise separation without further sedimentation.</p></div></div></div><div><div><div><div><h4><strong>Chromatographic Approaches</strong></h4><p>Chromatography is a common method of protein purification and is based on the separation of molecules in a mixture as they move through a stationary phase and a mobile phase. Outlined below are the various types of chromatography employed in protein purification.</p><h5><strong>Ion Exchange Chromatography</strong></h5><p><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/techniques/hplc-ion-exchange">Ion exchange chromatography</a> relies on the interaction between a charged stationary phase and oppositely charged analytes, with cation exchange chromatography attracting positively charged molecules to a negatively charged stationary phase. Successful application of this technique requires careful selection of the appropriate ion exchange column, buffer pH, and salt concentration. This approach is often used in the biopharmaceutical industries as mAb polishing steps, viral clearance and charge variant analyses as part of the product quality control.</p><p><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/">Phenomenex</a> offers a range of protein purification columns. Their ion exchange chromatography solutions include:&nbsp;</p><ul><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1526"><strong>Luna SCX </strong></a>for strong selectivity of positively charged compounds, such as peptides</li><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1540"><strong>Biozen WCX</strong></a> for efficient separation of proteins such as monoclonal antibodies charged variants</li><li><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/part/00g-3151-e0">PhenoSphere SAX</a>, a strong anion-exchanger with fully porous 80Å particles, particularly useful for small molecules such as nucleotides</li></ul><h5><strong>Size Exclusion Chromatography</strong></h5><p><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/techniques/hplc-sec">Size exclusion chromatography (SEC)</a> separates molecules based on their size, with larger analytes eluting first due to their exclusion from the pores in the column packing material, while smaller molecules are able to enter the pores, facing a longer travelling path, and hence, eluting later. This method can be categorized into aqueous SEC (gel filtration chromatography, GFC) for analyzing biomolecules such as proteins and antibodies. This type of chromatography is widely used as an analytical tool for quality control in the biopharmaceutical industry and can also be an approach of choice for polishing steps.</p><p>Phenomenex offers a range of <strong>Biozen columns for SEC</strong> separations. In the case of mAbs, <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1534"><strong>Biozen dSEC-2</strong></a> and<a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1537"><strong> Biozen dSEC-7 </strong></a>columns are the top choices for monoclonal antibody (mAb) analysis, delivering high-resolution separation of monomers, aggregates, and fragments formed during mAb manufacturing, processing, or storage. The dSEC-7 column, featuring a larger pore size and optimized particle design, extends the dynamic range to accommodate larger biomolecules and complex biotherapeutics.</p><p>For more general applications, <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1533"><strong>Biozen SEC-2</strong></a><strong> </strong>and <a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/products/1532"><strong>Biozen SEC-3</strong></a> phases cover different MW ranges for high-efficiency separation of biomolecules (e.g., proteins and antibodies). Additionally, the BioSep and Yarra lines become top choices when looking for preparative scale columns.</p><h5><strong>Reversed-Phase Chromatography</strong></h5><p><a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/techniques/hplc-reversed-phase">Reversed-phase chromatography</a>, the most common mode in high-performance liquid chromatography/ ultra-high-performance liquid chromatography (HPLC/UHPLC), separates compounds based on hydrophobic and van der Waals interactions using alkyl (C18, C8, C4) stationary phases or other hydrophobic polymers. For large biomolecules such as proteins and peptides, <a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/resources/blog/wider-pore-biozen-column">wide-pore</a> (typically 300 Å) C4, C8 and C18 columns are ideal, as the larger pore size allows better accessibility of the protein molecules to the stationary phase surface, improving mass transfer and peak shape during separation.</p><p>The Biozen line from Phenomenex offers a wide range of HPLC/UHPLC columns for the analysis of biomolecules.These include phases optimized for high-resolution analysis of intact proteins (Native-RP, Widepore C4, Intact XB-C8) and peptides (Peptide PS-C18, Peptide XB-C18 and Peptide Polar-C18). Kinetex could also be an option when looking for more selectivities for the analysis of peptides and small proteins. Additionally, when aiming to preparative scale processes, several of these media are also available in Phenomenex Axia formats to easily up-scale your separations.</p><h5><strong>Hydroxyapatite Chromatography</strong></h5><p>Hydroxyapatite chromatography (HAC) is a sophisticated mixed-mode chromatographic technique that exploits the unique properties of hydroxyapatite (Ca10(PO4)6(OH)2), utilizing both cation-exchange interactions via its phosphate groups and metal affinity through its calcium sites to achieve highly selective protein separations.</p><p>Renowned for its efficacy in resolving complex biomolecular separations, HAC excels in tasks like aggregate removal from monoclonal antibodies, surpassing the capabilities of traditional single-mode chromatographic methods such as ion-exchange or hydrophobic interaction chromatography.</p><h5><strong>Hydrophobic Interaction Chromatography</strong></h5><p>Hydrophobic interaction chromatography (HIC) is a method of protein purification that separates molecules based on their hydrophobicity, using high-salt buffers to promote protein-ligand interactions while maintaining the protein's biological activity. The process involves gradually reducing the salt concentration to elute proteins in order to increase hydrophobicity, making it effective for purifying target molecules and removing impurities or aggregates, making it a valuable approach for intermediate and polishing steps during purification processes.</p><h5><strong>Affinity Chromatography</strong></h5><p>Affinity chromatography is a powerful and highly selective technique used to purify biomolecules based on specific, reversible interactions between a target molecule and an immobilized ligand. In many cases, recombinant proteins are engineered with affinity tags—such as His-tags or GST-tags—that facilitate binding to complementary ligands on the chromatography matrix.</p><p>This method offers the advantage of achieving several thousand-fold purifications in a single step while preserving the biological activity of the protein. It is widely employed for purifying enzymes, antibodies, and antigens, using a variety of ligands including specific antibodies, enzymes, and multifunctional compounds like concanavalin A and triazine dyes.</p></div></div></div></div>

Exploring Protein Purification Methods: Essential Techniques for Accurate Results

<h3><span><strong>A Practical Guide to Getting the Most from Syringe Filters: Tips, Tricks, and Common Pitfalls</strong></span></h3><p><span><strong>Syringe filters play a crucial role in chromatography and many other laboratory applications by removing particulate matter before analysis. Proper sample filtration helps protect analytical instruments, extends column lifetime, and improves data quality. However, selecting an unsuitable filter—or using one incorrectly—can introduce contamination, reduce filtration efficiency, or even compromise analytical results. The following recommendations will help you avoid common mistakes and ensure reliable filtration every time.</strong></span></p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_3_150e8c1c2b.webp" alt="KNAUER: Avoiding Common Syringe Filter Mistakes" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_3_150e8c1c2b.webp 133w," sizes="100vw" width="1276" height="1496"></p><h4><span><strong>1. Improper Filter Handling</strong></span></h4><p><span>Using excessive force during filtration or attempting to reuse disposable syringe filters can damage the membrane and increase the risk of sample contamination.</span></p><ul><li><span><strong>Solution:</strong> Apply slow, even pressure throughout the filtration process and always dispose of single-use filters after one use. If the flow rate decreases noticeably, replace the filter instead of applying additional force.</span></li></ul><h4><span><strong>2. Selecting an Inappropriate Pore Size</strong></span></h4><p><span>Using the wrong pore size may either fail to remove unwanted particles or cause the membrane to clog prematurely, reducing filtration efficiency.</span></p><ul><li><span><strong>Solution:</strong> A 0.45 µm membrane is generally suitable for routine particulate removal, while a 0.22 µm membrane is recommended for finer filtration and bacterial removal. Samples with higher viscosity may require a pre-filter to prevent rapid clogging. It is also important to consider the intended analytical technique. For example, 0.22 µm filters are typically preferred for UHPLC and LC-MS applications, whereas 0.45 µm filters are often sufficient for conventional HPLC analyses.</span></li></ul><h4><span><strong>3. Choosing the Wrong Membrane Material</strong></span></h4><p><span>Different membrane materials exhibit different chemical resistance. Using an incompatible membrane may lead to degradation of the filter, sample contamination, or complete filtration failure.</span></p><ul><li><span><strong>Solution:</strong> Always verify solvent compatibility before filtration. PTFE membranes are an excellent choice for organic solvents, while PES and nylon membranes are better suited to aqueous samples. If compatibility is uncertain, perform a small-scale trial before filtering valuable samples.</span></li><li><span><strong>Pro Tip:</strong> For additional guidance, see our blog article <strong>"How to Choose the Right Membrane for your Syringe Filter"</strong>, which provides a detailed comparison of membrane materials and their recommended applications.</span></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_2_e47021fb11.jpg" alt="KNAUER Sepapure® Syringe Filters are available with multiple membrane materials, each identified by a dedicated color code for quick and reliable selection." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_2_e47021fb11.jpg 245w," sizes="100vw" width="1580" height="902"></p><h4><span><strong>4. Ignoring Filter Capacity</strong></span></h4><p><span>Using a filter with insufficient capacity can result in rapid membrane blockage, increasing filtration time and reducing laboratory productivity.</span></p><ul><li><span><strong>Solution:</strong> When filtering larger sample volumes, choose high-capacity syringe filters or introduce a pre-filtration step. Never force liquid through a clogged membrane, as doing so may damage the filter and negatively affect sample quality.</span></li></ul><h4><span><strong>5. Overlooking Sample Adsorption</strong></span></h4><p><span>Certain membrane materials may adsorb analytes of interest, leading to lower recoveries and potentially affecting quantitative results.</span></p><ul><li><span><strong>Solution:</strong> For protein samples or other adsorption-sensitive analytes, select membranes with low binding characteristics, such as nylon or glass fiber, whenever appropriate. Performing a small recovery test before routine analysis can help identify potential analyte losses.</span></li></ul><h4><span><strong>6. Failing to Optimize Filtration Performance</strong></span></h4><p><span>Slow filtration is more than just an inconvenience—it often indicates that the filtration conditions are not optimal.</span></p><ul><li><span><strong>Solution:</strong> If filtration becomes unusually slow, investigate possible causes such as membrane clogging, excessive sample viscosity, or an unnecessarily small pore size. Depending on the sample, dilution or sequential filtration using progressively finer filters may significantly improve performance.</span></li></ul><h4><span><strong>Final Thoughts</strong></span></h4><p><span>Selecting the appropriate syringe filter is a straightforward process, but overlooking small details can have a significant impact on analytical performance. Choosing the correct membrane material, pore size, and filtration strategy helps improve laboratory efficiency, protects chromatography systems and columns, and contributes to accurate, reproducible analytical results.</span></p><p><span>With the right syringe filter and proper filtration technique, you can minimize sample preparation problems and maximize confidence in every analysis.</span></p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_4_983a15e289.jpg" alt="KNAUER: Sepapure® Syringe Filter Selection" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Avoiding_Common_Syringe_Filter_Mistakes_4_983a15e289.jpg 245w," sizes="100vw" width="1160" height="627"></p><p><span><strong>Happy filtering!</strong></span></p>

Avoiding Common Syringe Filter Mistakes

News from LabRulezLCMS Library - Week 27, 2026

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Phenomenex is a global technology leader committed to developing novel analytical chemistry solutions that solve the separation and purification challenges of researchers in industrial, government and academic laboratories.

Phenomenex

Based in Berlin, KNAUER is a medium-sized, owner-managed company that has been serving the sciences since 1962. We develop and manufacture scientific instruments of superior quality for liquid chromatography, including: Analytical HPLC/UHPLC, Preparative HPLC, Fast protein liquid chromatography (FPLC), Multi-column chromatography/Simulated moving bed (SMB) chromatography. High pressure dosing, in-line detection systems, and osmometry are additional business areas.

KNAUER

KNAUER Eurospher II 100 C8 & C8A (U)HPLC Columns (USP L7)

C8 is a silica gel based stationary phase in reversed phase mode with alternative selectivity compared to C18 phases. 

<p class="cke-user_style-important"><strong>Classical and hydrophilic/aqueous C8 columns for HPLC and UHPLC (USP L7)</strong></p><p>C8 is a <strong>silica gel based stationary phase</strong> in <strong>reversed phase</strong> mode with alternative selectivity compared to C18 phases. Compared to C18 phases, these columns show <strong>less retention</strong> due to the <strong>lower hydrophobicity</strong>.</p><ul><li>Ultra pure, spherical high performance HPLC phase based on silica gel</li><li>Monomeric C8 (Octyl) modification, standard endcapping, with 10 % carbon content (~ 50 % endcapping)</li></ul><h5><strong>Properties</strong></h5><ul><li><strong>Separation mechanism</strong>: Hydrophobic interaction(lower compared to C18 phases)</li></ul><h5><strong>Key features</strong></h5><ul><li>Classical C8 phase, standard 50 % endcapping and 10 % carbon load, outstanding mechanical and chemical stability, suited for analytical as well as semi preparative and preparative applications.</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>Similar selectivity to C18 phase but less retention due to the lower hydrophobicity; useful for determination of:<ul><li>Water soluble vitamins</li><li>Steroids</li><li>Catecholamines</li><li>Sedatives</li></ul></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C8_rp_non_endcapped_3f7727d3fd.webp" alt="KNAUER: C8 RP Non-endcapped" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C8_rp_non_endcapped_3f7727d3fd.webp 148w," sizes="100vw" width="304" height="321"></p><p><strong>Hydrophilic C8A phase</strong> offers an alternative, more polar selectivity. It is suited for highly polar reversed phase applications with up to 100 % aqueous mobile phases.&nbsp;</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C8_A_e1f371165e.webp" alt="KNAUER: C8A" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C8_A_e1f371165e.webp 198w," sizes="100vw" width="473" height="373"></p><blockquote><p><strong>Tip: Caution! </strong>Even for short term storage all buffer solutions have to be rinsed from the column to prevent crystallization effects.</p></blockquote><p class="cke-user_style-important"><strong>Stationary phases Eurospher II 100 C8 and C8A are provided in these column types: </strong>analytical, semi-preparative and preparative.</p><p><strong>Eurospher II 100 C8 and C8A Analytical Columns </strong>are available with these parameters:</p><ul><li><strong>Column length (mm): </strong>50, 100, 150, 250</li><li><strong>Column ID (mm): </strong>2, 3, 4, 4.6</li><li><strong>Particle size (µm): </strong>2, 3, 5</li></ul><p><strong>Eurospher II 100 C8 and C8A Semi-Preparative Standard Columns </strong>are available with these parameters:</p><ul><li><strong>Column length (mm): </strong>30,<strong> </strong>50, 125, 150, 250</li><li><strong>Column ID (mm): </strong>8, 16</li><li><strong>Particle size (µm): </strong>5, 10</li></ul><h3><strong>KNAUER (U)HPLC Columns</strong></h3><p><strong>Widest range of HPLC and UHPLC columns for all separation modes and applications.</strong></p><ul><li><strong>Safe Investment</strong>: Robust and reliable columns for attractive price&nbsp;</li><li><strong>Separation Mode</strong>: Reversed Phase, HILIC, Normale</li><li><strong>Simplicity: </strong>Easy purchase via our online store with fast delivery</li><li><strong>Application: </strong>All-rounder for research or highly specialised for high-throughput analysis? We have the best column for your requirements.</li><li><strong>Flexibility:</strong> Wide selection of column and particle sizes, for (U)HPLC applications up to 1000 bar</li></ul><p><strong>KNAUER offers the perfect column for any small molecule separation.</strong> No matter which separation mode, molecule and the mobile phase, we offer a suitable (U)HPLC stationary phase. Choose from a wide range of modifications, particle sizes and column dimensions to suit your application. To elongate the lifetime of your column, you can choose to use a suitable precolumn.</p><figure class="image"><img style="aspect-ratio:787/674;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_KNAUER_U_HPLC_C8_and_C8_A_Columns_083c60f401.webp" alt="KNAUER: KNAUER (U)HPLC Columns" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_KNAUER_U_HPLC_C8_and_C8_A_Columns_083c60f401.webp 182w," sizes="100vw" width="787" height="674"></figure>

KNAUER Eurospher II 100 C18 (U)HPLC Columns (USP L1)

Stationary phase Eurospher II 100 C18 (U)HPLC is the most often used stationary phase in reversed phase mode

<p class="cke-user_style-important"><strong>Classical Reversed Phase columns for HPLC and UHPLC (USP L1)</strong></p><p><strong>Most often used stationary phase in reversed phase mode</strong>. Silica gel based columns with C18 modification are available with or without endcapping. Classically endcapped phases are slightly more hydrophobic and unpolar than the not endcapped phases.</p><h5><strong>Properties</strong></h5><ul><li><strong>Separation mechanism</strong>: Hydrophobic interaction</li><li><strong>Ultra pure</strong>, spherical high performance HPLC phase based on silica gel</li><li><strong>Unpolar, monomeric C18</strong> (Octadecyl) modification, endcapped, with 16 % carbon content (~ 50 % endcapping).</li></ul><h5><strong>Key features</strong></h5><ul><li>High-class HPLC phase perfectly suited to take on routine analyses as well as the most ambitious chromatography tasks, classical C18 phase with ca. 50 % endcapping and resulting 16 % carbon content, outstanding mechanical and chemical stability.</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>acidic, basic and neutral analytes in reversed phase mode, for example sulphonamides</li><li>anabolic steroids</li><li>anti-psychotics</li><li>beta blocker</li><li>sudan dyes</li><li>phenols and preservatives</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C18_non_endcapped_6e4fce9989.webp" alt="KNAUER: C18 Non-endcapped" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C18_non_endcapped_6e4fce9989.webp 245w," sizes="100vw" width="682" height="420"></p><blockquote><p><strong>Tip: Caution! </strong>Never use classical C18 phases with 100 % aqueous mobile phase. The hydrophobic C18 chains will collapse</p></blockquote><p class="cke-user_style-important"><strong>Stationary phase Eurospher II 100 C18 is provided in these column types: </strong>analytical, semi-preparative and preparative.</p><p><strong>Eurospher II 100 C18 Analytical Columns </strong>are available with these parameters:</p><ul><li><strong>Column length (mm): </strong>50, 100, 150, 250</li><li><strong>Column ID (mm): </strong>2, 3, 4, 4.6</li><li><strong>Particle size (µm): </strong>2, 3, 5</li></ul><p><strong>Eurospher II 100 C18 Semi-Preparative Standard Columns </strong>are available with these parameters:</p><ul><li><strong>Column length (mm): </strong>30,<strong> </strong>50, 125, 150, 250</li><li><strong>Column ID (mm): </strong>8, 16</li><li><strong>Particle size (µm): </strong>5, 10</li></ul><h3><strong>KNAUER (U)HPLC Columns</strong></h3><p><strong>Widest range of HPLC and UHPLC columns for all separation modes and applications.</strong></p><ul><li><strong>Safe Investment</strong>: Robust and reliable columns for attractive price&nbsp;</li><li><strong>Separation Mode</strong>: Reversed Phase, HILIC, Normale</li><li><strong>Simplicity: </strong>Easy purchase via our online store with fast delivery</li><li><strong>Application: </strong>All-rounder for research or highly specialised for high-throughput analysis? We have the best column for your requirements.</li><li><strong>Flexibility:</strong> Wide selection of column and particle sizes, for (U)HPLC applications up to 1000 bar</li></ul><p><strong>KNAUER offers the perfect column for any small molecule separation.</strong> No matter which separation mode, molecule and the mobile phase, we offer a suitable (U)HPLC stationary phase. Choose from a wide range of modifications, particle sizes and column dimensions to suit your application. To elongate the lifetime of your column, you can choose to use a suitable precolumn.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_KNAUER_U_HPLC_C8_and_C8_A_Columns_083c60f401.webp" alt="KNAUER: KNAUER (U)HPLC Columns" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_KNAUER_U_HPLC_C8_and_C8_A_Columns_083c60f401.webp 182w," sizes="100vw" width="787" height="674"></p>

KNAUER Eurospher II Chiral NR Columns for NP & RP

Eurospher II Chiral NR is an immobilized brush-type phase with very broad generality and orhogonal selectivity to Eurospher II Chiral AM and OM.

<p><strong>Eurospher II Chiral NR</strong> is an immobilized brush-type phase with very broad generality and <strong>orhogonal selectivity to Eurospher II Chiral AM and OM</strong>. In many cases it is <strong>much more stable</strong> compared to Eurospher II Chiral AM or OM. The Chiral-NR selector is <strong>covalently bound</strong>, so that you can use all HPLC-eluents.</p><p>Due to its high loadability it is perfectly suited for preparative separations. Both phases can be used in RP and NP mode. Eurospher II Chiral-NR-R shows reversed elution order compared to Eurospher II Chiral-NR caused by the modification with the opposite enantiomeric form of the chiral selector.</p><h5><strong>Properties</strong></h5><ul><li><strong>Silica gel: </strong>ultra pure, &gt; 99.99 %</li><li><strong>Metal content: </strong>&lt; 10 ppm</li><li><strong>Particle size:&nbsp;</strong><ul><li>Eurospher II Chiral NR: 3 μm, 5 μm, 8 µm, 12 µm</li><li>Eurospher II Chiral NR-R: 8 µm, 12 µm</li></ul></li><li><strong>Particle form: </strong>spherical</li><li><strong>Pore size of base material: </strong>1000 Å</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>Eurospher II Chiral NR columns are able to separate analytes with an oxygen at or near the chiral center and additionally an aromatic ring.</li></ul><blockquote><p class="cke-user_style-important"><strong>Stationary phase Eurospher II Chiral NR (NR-R) is provided in these column types: analytical, semi-preparative and preparative.</strong></p></blockquote><p><strong>Eurospher II Chiral NR and NR-R Analytical Columns are available with these parameters:</strong></p><ul><li><strong>Column length (mm): </strong>50, 100, 150, 250</li><li><strong>Column ID (mm): </strong>3,<strong> </strong>4, 4.6</li><li><strong>Particle size (µm): </strong>3, 5, 8, 12</li></ul><p><strong>Eurospher II Chiral NR and NR-R Semi-Preparative Standard Columns are available with these parameters:</strong></p><ul><li><strong>Column length (mm): </strong>150, 250</li><li><strong>Column ID (mm): </strong>8,<strong> </strong>10</li><li><strong>Particle size (µm): </strong>8, 12</li></ul><h3><strong>KNAUER Chiral HPLC Columns</strong></h3><p><strong>For analytical, preparative and SMB chiral separations</strong></p><ul><li><strong>Column Brand</strong><ul><li>Eurospher II</li></ul></li><li><strong>Reversed Phase Modifications</strong><ul><li>Chiral NR-R</li><li>Chiral AM-R</li><li>Chiral OM-R</li></ul></li><li><strong>Normal Phase Modifications</strong><ul><li>Chiral NR</li><li>Chiral AM</li><li>Chiral OM</li></ul></li><li><strong>Flexibility: </strong>Wide selection of column and particle sizes, for preparative and analytical applications</li><li><strong>Expandable:</strong> Upscaling even for continuous SMB</li><li><strong>Application Service: </strong>We offer a customized screening service for your analytes. You will receive an optimal column recommendation including the method parameters.</li></ul><h4><strong>Eurospher II Chiral</strong></h4><p>Based on ultra-high purity silica, the Eurospher II chiral column materials are characterized by <strong>high enantioselectivity</strong> and <strong>loadability</strong>.&nbsp;</p><p>Available in a <strong>wide range of dimensions</strong> for <strong>analytical</strong>, <strong>preparative</strong> and<strong> SMB</strong> (simulated moving bed) applications, Eurospher II Chiral columns are the perfect choice for even the most challenging enantioseparation tasks&nbsp;</p><p>Since chiral separations are not very well predictable, KNAUER offers a chiral screening service for your samples (Article number: AL0220).</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurospher_II_chiral_48c53afebe.jpg" alt="KNAUER: Eurospher II chiral" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurospher_II_chiral_48c53afebe.jpg 245w," sizes="100vw" width="1369" height="633"></p><blockquote><p><strong>Tip:</strong> Some of the most popular eluents for HPLC (such as acetone, chloroform, DMF, DMSO, MEK, toluene, dioxane, ethyl acetate, methylene chloride, pyridine and THF) which may be remaining in your HPLC system, can destroy Eurospher II Chiral AM and OM phases even in small concentrations! It is highly recommended that the HPLC system is flushed with appropriate eluents before the installation of the chiral column.</p></blockquote>

KNAUER Eurokat H Ion Exclusion/Ligand Exchange Columns (USP L17)

The Eurokat H ionic form is especially designed for the analysis of organic acids and even complex mixtures of acids, sugars and alcohols as well as sugar alcohols.

<p class="cke-user_style-important"><strong>Organic acids and alcohols</strong></p><p><strong>The Eurokat H ionic form </strong>is especially designed for the analysis of <strong>organic acids</strong> and even <strong>complex mixtures of acids</strong>, <strong>sugars</strong> and <strong>alcohols</strong> as well as <strong>sugar alcohols</strong>. It is a <strong>cation exchange</strong> material with 8 % cross linkage of the styrenedivinylbenzene copolymer. Best results are acieved with aqueous eluents and small amounts of anorganic acids, recommended eluent 0.005 M sulfuric acid. The usage of up to 10 % organic content in the mobile phase is possible.</p><h5><strong>Properties</strong></h5><ul><li><strong>Sulfonated cross-linked styrenedivinylbenzene copolymer </strong>phase for the determination of organic acids, carbohydrates and alcohols</li><li><strong>H-form, 8 % cross linkage</strong></li><li>Cation exchanger, extremly long lasting lifetime when correctly handled, best results with aqueous eluents and small amounts of anorganic acids, recommended eluent 0,01 N sulfuric acid, usage of up to 10 % organic content in the mobile phase is possible</li></ul><h5><strong>Technical Data</strong></h5><ul><li>Sulfonated cross-linked styrenedivinylbenzene copolymer with 8 % cross linkage in the ionic form H, available in 10 μm particle size, pressure stable up to maximum 100 bar</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>Eurokat H is especially designed for the analysis of organic acids and even complex mixtures of acids, sugars and alcohols as well as sugar alcohols. Due to a differing separation process we recommend the use of these type of columns only in 8 mm ID or 4 mm ID.</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurokat_H_Chromatogram_e2c6665a1f.webp" alt="KNAUER: Eurokat H Chromatogram" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurokat_H_Chromatogram_e2c6665a1f.webp 245w," sizes="100vw" width="690" height="281"></p><blockquote><p><strong>Tip:</strong> Eurokat columns are characterized by an extremely long lifetime if handled properly. Especially pressure shocks and organic solvent contents of more than 10 % in the mobile phase should be avoided absolutely.</p></blockquote><h3><strong>KNAUER Ion Exclusion and Ligand Exchange Columns</strong></h3><p><strong>Separation of organic acids, carbohydrates, alcohols on sulfonated cross-linked styrenedivinylbenzene copolymer</strong></p><ul><li><strong>Modifications</strong><ul><li>Eurokat H</li><li>Eurokat Ca</li><li>Eurokat Pb</li><li>Eurokat Na</li></ul></li><li><strong>High Temperature Methods:</strong> Up to 90 °C</li><li><strong>Method Development: </strong>Optional up to 10 % organic solvent</li><li><strong>Chemically stable: </strong>pH 1–12</li><li><strong>Sustainability:</strong> Aqueous eluents protect the environment and are cost-effectiv</li><li><strong>User Friendly:</strong> Simple and robust methods for daily analysis. Versatile in its use.</li><li><strong>Simplicity:</strong> Easy purchase via our online store with fast delivery.&nbsp;</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><p>Eurokat high performance polymer phases were especially developed for the separation of organic acids, carbohydrates, alcohols and even complex mixtures of these compounds. Eurokat is a sulfonated cross-linked styrenedivinylbenzene copolymer available in several ionic forms (H, Ca and Pb). This particular cation exchanger is characterized by an outstanding density of functional groups, making it the ideal choice for your ion exclusion, size exclusion and ligand exchange chromatography.</p><h4><strong>Choice of chromatographic conditions&nbsp;</strong></h4><p>The Eurokat stationary phase is designed to be applicable to a wide range of diverse chromatographic conditions. All Eurokat columns can be used at temperatures up to 90 °C with no organic solvents. The best separation of sugars can be achieved using between 60 to 90 °C. To extend separation performance, it is possible to connect up to three columns of Eurokat in series. Eurokat columns require no organic solvents and thus are environmentally friendly.&nbsp;</p><h4><strong>Stability&nbsp;</strong></h4><p>Eurokat polymer columns are extremely stable over the whole pH range. This is one striking advantage compared with silica-based phases which have a limited lifetime at pH extremes, especially in the higher pH range. Most importantly, Eurokat phases show extraordinary column lifetime stability and are not affected by aqueous solvents.&nbsp;</p><h4><strong>Application areas&nbsp;</strong></h4><ul><li>Carbohydrates and organic acids in softdrinks and fruit juices&nbsp;</li><li>Sugar substitutes</li><li>Food preservatives</li><li>Dairy products</li><li>Urine analytic (Uric acid, Hippuric acid)</li><li>Monitoring of fermentation processes</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg" alt="KNAUER: Eurokat - Principle of ligand exchange mechanism" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg 245w," sizes="100vw" width="1382" height="570"></p>

KNAUER Eurokat Pb & Ca Ion Exclusion/Ligand Exchange Columns (USP L34 / USP L19)

The ionic forms Ca and Pb are best suited for the analysis of smaller carbohydrates like mono- and disaccharides and sugars up to a degree of polymerization (DP) of 4. 

<p class="cke-user_style-important"><strong>Analysis of mono- and disaccharides</strong></p><p><strong>The ionic forms Ca and Pb</strong> are best suited for the analysis of smaller carbohydrates like <strong>mono- and disaccharides </strong>and <strong>sugars up to a degree of polymerization (DP) of 4</strong>. It is a cation exchange material with 6 % cross linkage of the styrenedivinylbenzene copolymer. Best results are achieved with aqueous eluents, recommended eluent is pure deionized water. The usage of up to 10 % organic content in the mobile phase is possible.</p><h5><strong>Properties</strong></h5><ul><li><strong>Polymer phase for the determination of mono- and disaccharides</strong></li><li><strong>Pb (USP L34) form, 6 % cross linkage</strong></li><li>Cation exchanger, extremely long lasting lifetime when correctly handled, best results with aqueous eluents, recommended eluent is pure deionized water, usage of up to 10 % organic content in the mobile phase is possible</li></ul><h5><strong>Technical Data</strong></h5><ul><li>Sulfonated cross-linked styrenedivinylbenzene copolymer with 6 % cross linkage in the ionic form Pb, available in 10μm particle size, pressure stable up to maximum 100 bar</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>Especially designed for the analysis of small carbohydrates up to DP 4</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurokat_Pb_Ca_Chromatogram_2054f70e49.webp" alt="KNAUER: Eurokat Pb &amp; Ca Chromatogram" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurokat_Pb_Ca_Chromatogram_2054f70e49.webp 245w," sizes="100vw" width="690" height="271"></p><blockquote><p><strong>Tip:</strong> Eurokat columns are used at high temperatures. During equilibration it is very important to have an eye on the backpressure and to start with very low flow rates and increase them only slowly and stepwise after the column has adapted to the temperature.</p></blockquote><h3><strong>KNAUER Ion Exclusion and Ligand Exchange Columns</strong></h3><p><strong>Separation of organic acids, carbohydrates, alcohols on sulfonated cross-linked styrenedivinylbenzene copolymer</strong></p><ul><li><strong>Modifications</strong><ul><li>Eurokat H</li><li>Eurokat Ca</li><li>Eurokat Pb</li><li>Eurokat Na</li></ul></li><li><strong>High Temperature Methods:</strong> Up to 90 °C</li><li><strong>Method Development: </strong>Optional up to 10 % organic solvent</li><li><strong>Chemically stable: </strong>pH 1–12</li><li><strong>Sustainability:</strong> Aqueous eluents protect the environment and are cost-effectiv</li><li><strong>User Friendly:</strong> Simple and robust methods for daily analysis. Versatile in its use.</li><li><strong>Simplicity:</strong> Easy purchase via our online store with fast delivery.&nbsp;</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><p>Eurokat high performance polymer phases were especially developed for the separation of organic acids, carbohydrates, alcohols and even complex mixtures of these compounds. Eurokat is a sulfonated cross-linked styrenedivinylbenzene copolymer available in several ionic forms (H, Ca and Pb). This particular cation exchanger is characterized by an outstanding density of functional groups, making it the ideal choice for your ion exclusion, size exclusion and ligand exchange chromatography.</p><h4><strong>Choice of chromatographic conditions&nbsp;</strong></h4><p>The Eurokat stationary phase is designed to be applicable to a wide range of diverse chromatographic conditions. All Eurokat columns can be used at temperatures up to 90 °C with no organic solvents. The best separation of sugars can be achieved using between 60 to 90 °C. To extend separation performance, it is possible to connect up to three columns of Eurokat in series. Eurokat columns require no organic solvents and thus are environmentally friendly.&nbsp;</p><h4><strong>Stability&nbsp;</strong></h4><p>Eurokat polymer columns are extremely stable over the whole pH range. This is one striking advantage compared with silica-based phases which have a limited lifetime at pH extremes, especially in the higher pH range. Most importantly, Eurokat phases show extraordinary column lifetime stability and are not affected by aqueous solvents.&nbsp;</p><h4><strong>Application areas&nbsp;</strong></h4><ul><li>Carbohydrates and organic acids in softdrinks and fruit juices&nbsp;</li><li>Sugar substitutes</li><li>Food preservatives</li><li>Dairy products</li><li>Urine analytic (Uric acid, Hippuric acid)</li><li>Monitoring of fermentation processes</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg" alt="KNAUER: Eurokat - Principle of ligand exchange mechanism" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg 245w," sizes="100vw" width="1382" height="570"></p>

KNAUER Eurokat Na Ion Exclusion/Ligand Exchange Columns

The ionic form Na is best suited for the analysis of sugars oligomers up to a degree of polymerization (DP) of 8. 

<p class="cke-user_style-important"><strong>Analysis of sugar oligomers</strong></p><p><strong>The ionic form Na</strong> is best suited for the analysis of <strong>sugars oligomers</strong> up to a <strong>degree of polymerization (DP) of 8</strong>. It is a cation exchange material with <strong>6 % cross linkage of the styrenedivinylbenzene copolymer</strong>. Best results are achieved with aqueous eluents, recommended eluent is pure deionized water. The usage of up to 10 % organic content in the mobile phase is possible.&nbsp;</p><h5><strong>Properties</strong></h5><ul><li><strong>Polymer phase for the determination of sugar oligomers</strong></li><li><strong>Na form, 6 % cross linkage</strong></li><li>Cation exchanger, extremly long lasting lifetime when correctly handled, best results with aqueous eluents, recommended eluent is pure deionized water, usage of up to 10 % organic content in the mobile phase is possible</li></ul><h5><strong>Technical Data</strong></h5><ul><li>Sulfonated cross-linked styrenedivinylbenzene copolymer with 6 % cross linkage in the ionic form Na, available in 10 μm particle size, pressure stable up to maximum 100 bar</li></ul><h5><strong>Recommended application areas</strong></h5><ul><li>Especially designed for the analysis of sugar oligomers, separates carbohydrates up to DP 8</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurokat_Na_Chromatogram_7d3d81fa52.webp" alt="KNAUER: Eurokat Na Chromatogram" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurokat_Na_Chromatogram_7d3d81fa52.webp 188w," sizes="100vw" width="686" height="568"></p><blockquote><p><strong>Tip:</strong> Eurokat columns are typically used with 100 % aqueous eluents. For storage, please avoid microbial growth by flushing the Eurokat column with 0.45 µm filtered ultrapure water and storing it at 4 °C.</p></blockquote><h3><strong>KNAUER Ion Exclusion and Ligand Exchange Columns</strong></h3><p><strong>Separation of organic acids, carbohydrates, alcohols on sulfonated cross-linked styrenedivinylbenzene copolymer</strong></p><ul><li><strong>Modifications</strong><ul><li>Eurokat H</li><li>Eurokat Ca</li><li>Eurokat Pb</li><li>Eurokat Na</li></ul></li><li><strong>High Temperature Methods:</strong> Up to 90 °C</li><li><strong>Method Development: </strong>Optional up to 10 % organic solvent</li><li><strong>Chemically stable: </strong>pH 1–12</li><li><strong>Sustainability:</strong> Aqueous eluents protect the environment and are cost-effectiv</li><li><strong>User Friendly:</strong> Simple and robust methods for daily analysis. Versatile in its use.</li><li><strong>Simplicity:</strong> Easy purchase via our online store with fast delivery.&nbsp;</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><p>Eurokat high performance polymer phases were especially developed for the separation of organic acids, carbohydrates, alcohols and even complex mixtures of these compounds. Eurokat is a sulfonated cross-linked styrenedivinylbenzene copolymer available in several ionic forms (H, Ca and Pb). This particular cation exchanger is characterized by an outstanding density of functional groups, making it the ideal choice for your ion exclusion, size exclusion and ligand exchange chromatography.</p><h4><strong>Choice of chromatographic conditions&nbsp;</strong></h4><p>The Eurokat stationary phase is designed to be applicable to a wide range of diverse chromatographic conditions. All Eurokat columns can be used at temperatures up to 90 °C with no organic solvents. The best separation of sugars can be achieved using between 60 to 90 °C. To extend separation performance, it is possible to connect up to three columns of Eurokat in series. Eurokat columns require no organic solvents and thus are environmentally friendly.&nbsp;</p><h4><strong>Stability&nbsp;</strong></h4><p>Eurokat polymer columns are extremely stable over the whole pH range. This is one striking advantage compared with silica-based phases which have a limited lifetime at pH extremes, especially in the higher pH range. Most importantly, Eurokat phases show extraordinary column lifetime stability and are not affected by aqueous solvents.&nbsp;</p><h4><strong>Application areas&nbsp;</strong></h4><ul><li>Carbohydrates and organic acids in softdrinks and fruit juices&nbsp;</li><li>Sugar substitutes</li><li>Food preservatives</li><li>Dairy products</li><li>Urine analytic (Uric acid, Hippuric acid)</li><li>Monitoring of fermentation processes</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg" alt="KNAUER: Eurokat - Principle of ligand exchange mechanism" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Principle_of_ligand_exchange_mechanism_a5b7c21c43.jpg 245w," sizes="100vw" width="1382" height="570"></p>

KNAUER Eurosil Bioselect 300 C4 HPLC Columns (USP L26)

Eurosil Bioselect C4 has been specifically developed for the determination and purification of peptides, proteins, and oligonucleotides up to a molecular weight of approximately 100 kDa. 

<p class="cke-user_style-important"><strong>Analytical wide pore phase for the determination of biomolecules bigger than 20 kDa</strong></p><p><strong>Eurosil Bioselect C4</strong> has been specifically developed for the <strong>determination</strong> and <strong>purification</strong> of <strong>peptides</strong>, <strong>proteins</strong>, and <strong>oligonucleotides</strong> up to a molecular weight of approximately <strong>100 kDa</strong>. The optimized manufacturing process guarantees excellent batch–to-batch reproducibility. The Eurosil Bioselect sorbent is the first choice for Biochromatography with silica material.</p><h5><strong>Properties</strong></h5><ul><li><strong>Ultra pure, spherical wide pore HPLC </strong>phase based on wide pore silica gel</li><li>Unpolar, monomeric C4 modification, endcapped</li><li><strong>2 % carbon content </strong>(conventional endcapping)</li><li><strong>Separation mechanism: </strong>hydrophobic and hydrophilic interaction</li></ul><figure class="image"><img style="aspect-ratio:200/400;" src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C4_3f3adfbdb4.webp" alt="KNAUER: C4" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C4_3f3adfbdb4.webp 78w," sizes="100vw" width="200" height="400"></figure><h5><strong>Recommended application areas</strong></h5><ul><li>Hydrophilic biomolecules and especially peptides larger than 10 000- 20 000 Da</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg" alt="KNAUER: Eurosil Bioselect - Phases and recommended sizes of molecules" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg 245w," sizes="100vw" width="1385" height="778"></p><h3><strong>KNAUER Wide pore HPLC columns</strong></h3><p><strong>For enhanced resolution, capacity and recovery of proteins and other biomolecules</strong></p><ul><li><strong>Material: </strong>Silica or polymer particles</li><li><strong>Separation Ranges</strong>: 2–100 kDa</li><li><strong>Column Brands</strong>: Eurosil Bioselect or AppliChrom®</li><li><strong>Particle sizes:</strong> 3–10 µm</li><li><strong>Pore Sizes: </strong>300 or 100–1000 Å</li><li><strong>Specific surface: </strong>90 ± 5 m2/g</li><li><strong>Pore volume:</strong> 0.8 ml/g</li><li><strong>Density:</strong> 450 g/l</li><li><strong>Applications:</strong> Peptides exceeding approximately 50 amino acids and oligonucleotides greater than 25 residues</li><li><strong>Customize: </strong>Bioanalysis requires a lot of flexibility in the pore size, the pH range, the temperatures and the solvents used. To achieve this, we cross phase limits.</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><ul><li>Eurosil Bioselect columns are available in 4 modifications, useful for a wide range of separation tasks involving large molecules up to 100 000 Da.</li><li>Strict manufacturing procedures ensure a very narrow pore size distribution.</li><li>Interfering anions or heavy metal ions on the silica surface are not present in Eurosil Bioselect columns because only ultra pure silica gel and high quality chemical modifications are employed.</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_85cfc2d201.jpg" alt="KNAUER: Eurosil Bioselect" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_85cfc2d201.jpg 222w," sizes="100vw" width="1114" height="782"></p><h4><strong>Separation mechanism of Eurosil Bioselect</strong></h4><p>To separate larger molecules, they need to freely access the interior of the pores of the packing material. Therefore, the analytes’ diameter must be smaller than the average pore diameter.&nbsp;</p><p>For higher molecular weight solutes, the use of lower pore size materials (60-120 Å) as typically used for the analysis of small molecules may result restricted diffusion in the material´s pores and therewith reduced column efficiency.&nbsp;</p><h4><strong>Modifications</strong></h4><p>The recommended modification of Eurosil Bioselect depends on the molecular weight of the analytes.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg" alt="KNAUER: Eurosil Bioselect - chemical modifications" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg 245w," sizes="100vw" width="955" height="505"><br>&nbsp;</p>

KNAUER Eurosil Bioselect 300 C8 HPLC Columns (USP L7)

Eurosil Bioselect C8 has been specifically developed for the determination and purification of peptides, proteins, and oligonucleotides up to a molecular weight of approximately 20 kDa.

<p class="cke-user_style-important"><strong>Analytical wide pore phase for the determination of biomolecules bigger than 5000 Da</strong></p><p><strong>Eurosil Bioselect C8</strong> has been specifically developed for the <strong>determination </strong>and <strong>purification </strong>of <strong>peptides</strong>, <strong>proteins</strong>, and <strong>oligonucleotides</strong> <strong>up to</strong> a molecular weight of approximately <strong>20 kDa</strong>.</p><h5><strong>Properties</strong></h5><ul><li><strong>Ultra pure, spherical wide pore HPLC </strong>phase based on wide pore silica gel</li><li>Unpolar, monomeric C8 modification, endcapped</li><li><strong>4.5 % carbon content </strong>(conventional endcapping)</li><li><strong>Separation mechanism: </strong>hydrophobic interaction</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C8_hydrosphob_6986c292b4.webp" alt="KNAUER: C8" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C8_hydrosphob_6986c292b4.webp 144w," sizes="100vw" width="381" height="413"></p><h5><strong>Recommended application areas</strong></h5><ul><li>Hydrophilic biomolecules, peptides, peptide mapping after enzymatic digestion</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg" alt="KNAUER: Eurosil Bioselect - Phases and recommended sizes of molecules" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg 245w," sizes="100vw" width="1385" height="778"></p><h3><strong>KNAUER Wide pore HPLC columns</strong></h3><p><strong>For enhanced resolution, capacity and recovery of proteins and other biomolecules</strong></p><ul><li><strong>Material: </strong>Silica or polymer particles</li><li><strong>Separation Ranges</strong>: 2–100 kDa</li><li><strong>Column Brands</strong>: Eurosil Bioselect or AppliChrom®</li><li><strong>Particle sizes:</strong> 3–10 µm</li><li><strong>Pore Sizes: </strong>300 or 100–1000 Å</li><li><strong>Specific surface: </strong>90 ± 5 m2/g</li><li><strong>Pore volume:</strong> 0.8 ml/g</li><li><strong>Density:</strong> 450 g/l</li><li><strong>Applications:</strong> Peptides exceeding approximately 50 amino acids and oligonucleotides greater than 25 residues</li><li><strong>Customize: </strong>Bioanalysis requires a lot of flexibility in the pore size, the pH range, the temperatures and the solvents used. To achieve this, we cross phase limits.</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><ul><li>Eurosil Bioselect columns are available in 4 modifications, useful for a wide range of separation tasks involving large molecules up to 100 000 Da.</li><li>Strict manufacturing procedures ensure a very narrow pore size distribution.</li><li>Interfering anions or heavy metal ions on the silica surface are not present in Eurosil Bioselect columns because only ultra pure silica gel and high quality chemical modifications are employed.</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_85cfc2d201.jpg" alt="KNAUER: Eurosil Bioselect" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_85cfc2d201.jpg 222w," sizes="100vw" width="1114" height="782"></p><h4><strong>Separation mechanism of Eurosil Bioselect</strong></h4><p>To separate larger molecules, they need to freely access the interior of the pores of the packing material. Therefore, the analytes’ diameter must be smaller than the average pore diameter.&nbsp;</p><p>For higher molecular weight solutes, the use of lower pore size materials (60-120 Å) as typically used for the analysis of small molecules may result restricted diffusion in the material´s pores and therewith reduced column efficiency.&nbsp;</p><h4><strong>Modifications</strong></h4><p>The recommended modification of Eurosil Bioselect depends on the molecular weight of the analytes.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg" alt="KNAUER: Eurosil Bioselect - chemical modifications" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg 245w," sizes="100vw" width="955" height="505"><br>&nbsp;</p>

KNAUER Eurosil Bioselect 300 C18 HPLC Columns (USP L1)

Eurosil Bioselect C18 has been specifically developed for the determination and purification of peptides, proteins, and oligonucleotides up to a molecular weigth of approximately 5 kDa.

<p class="cke-user_style-important"><strong>Analytical wide pore phase for the determination of biomolecules bigger than 2000 Da​</strong></p><p><strong>Eurosil Bioselect C18 </strong>has been specifically developed for the <strong>determination</strong> and <strong>purification</strong> of <strong>peptides</strong>, <strong>proteins</strong>, and <strong>oligonucleotides</strong> up to a molecular weigth of approximately <strong>5 kDa</strong>.</p><h5><strong>Properties</strong></h5><ul><li><strong>Ultra pure, spherical wide pore HPLC </strong>phase based on silica gel</li><li>Unpolar, monomeric C18 (Octadecyl) modification, endcapped</li><li><strong>7.5 % carbon content </strong>(conventional endcapping)</li><li><strong>Separation mechanism: </strong>hydrophobic interaction</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C18_Endcapped_standard_edd2523aca.webp" alt="KNAUER: C18 Endcapped standard" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C18_Endcapped_standard_edd2523aca.webp 234w," sizes="100vw" width="688" height="458"></p><h5><strong>Recommended application areas</strong></h5><ul><li>Hydrophilic biomolecules, peptides, peptide mapping after enzymatic digestion</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg" alt="KNAUER: Eurosil Bioselect - Phases and recommended sizes of molecules" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg 245w," sizes="100vw" width="1385" height="778"></p><blockquote><p><strong>Tip: </strong>Caused by the larger pore size of 300 Å, Eurosil Bioselect phases are not as mechanical stable as classical silica gel phases with up to 150 Å and should not be used above 200 bar pressure.</p></blockquote><h3><strong>KNAUER Wide pore HPLC columns</strong></h3><p><strong>For enhanced resolution, capacity and recovery of proteins and other biomolecules</strong></p><ul><li><strong>Material: </strong>Silica or polymer particles</li><li><strong>Separation Ranges</strong>: 2–100 kDa</li><li><strong>Column Brands</strong>: Eurosil Bioselect or AppliChrom®</li><li><strong>Particle sizes:</strong> 3–10 µm</li><li><strong>Pore Sizes: </strong>300 or 100–1000 Å</li><li><strong>Specific surface: </strong>90 ± 5 m2/g</li><li><strong>Pore volume:</strong> 0.8 ml/g</li><li><strong>Density:</strong> 450 g/l</li><li><strong>Applications:</strong> Peptides exceeding approximately 50 amino acids and oligonucleotides greater than 25 residues</li><li><strong>Customize: </strong>Bioanalysis requires a lot of flexibility in the pore size, the pH range, the temperatures and the solvents used. To achieve this, we cross phase limits.</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><ul><li>Eurosil Bioselect columns are available in 4 modifications, useful for a wide range of separation tasks involving large molecules up to 100 000 Da.</li><li>Strict manufacturing procedures ensure a very narrow pore size distribution.</li><li>Interfering anions or heavy metal ions on the silica surface are not present in Eurosil Bioselect columns because only ultra pure silica gel and high quality chemical modifications are employed.</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_85cfc2d201.jpg" alt="KNAUER: Eurosil Bioselect" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_85cfc2d201.jpg 222w," sizes="100vw" width="1114" height="782"></p><h4><strong>Separation mechanism of Eurosil Bioselect</strong></h4><p>To separate larger molecules, they need to freely access the interior of the pores of the packing material. Therefore, the analytes’ diameter must be smaller than the average pore diameter.&nbsp;</p><p>For higher molecular weight solutes, the use of lower pore size materials (60-120 Å) as typically used for the analysis of small molecules may result restricted diffusion in the material´s pores and therewith reduced column efficiency.&nbsp;</p><h4><strong>Modifications</strong></h4><p>The recommended modification of Eurosil Bioselect depends on the molecular weight of the analytes.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg" alt="KNAUER: Eurosil Bioselect - chemical modifications" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg 245w," sizes="100vw" width="955" height="505"><br>&nbsp;</p>

KNAUER Eurosil Bioselect 300 C18A HPLC Columns (USP L1)

Eurosil Bioselect C18A has been specifically developed for the determination and purification of peptides, proteins, and oligonucleotides up to a molecular weigth of approximately 5 kDa.

<p class="cke-user_style-important"><strong>Analytical wide pore phase for the determination of biomolecules up to 5000 Da​</strong></p><p><strong>Eurosil Bioselect C18A </strong>has been specifically developed for the <strong>determination</strong> and <strong>purification</strong> of <strong>peptides</strong>, <strong>proteins</strong>, and <strong>oligonucleotides</strong> up to a molecular weigth of approximately <strong>5 kDa</strong>.</p><h5><strong>Properties</strong></h5><ul><li><strong>Ultra pure, spherical wide pore HPLC </strong>phase based on silica gel</li><li>Unpolar, monomeric C18 (Octadecyl) modification, endcapped</li><li><strong>7 % carbon content </strong>(hydrophilic endcapping)</li><li><strong>Separation mechanism: </strong>hydrophobic interaction</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_C18_A_6f4b0c3063.webp" alt="KNAUER: C18A" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_C18_A_6f4b0c3063.webp 245w," sizes="100vw" width="690" height="428"></p><h5><strong>Recommended application areas</strong></h5><ul><li>Hydrophilic and polar biomolecules, peptides, very polar biomolecules separated with 100 % aqueous eluents</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg" alt="KNAUER: Eurosil Bioselect - Phases and recommended sizes of molecules" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_Phases_98acc32d0e.jpg 245w," sizes="100vw" width="1385" height="778"></p><h3><strong>KNAUER Wide pore HPLC columns</strong></h3><p><strong>For enhanced resolution, capacity and recovery of proteins and other biomolecules</strong></p><ul><li><strong>Material: </strong>Silica or polymer particles</li><li><strong>Separation Ranges</strong>: 2–100 kDa</li><li><strong>Column Brands</strong>: Eurosil Bioselect or AppliChrom®</li><li><strong>Particle sizes:</strong> 3–10 µm</li><li><strong>Pore Sizes: </strong>300 or 100–1000 Å</li><li><strong>Specific surface: </strong>90 ± 5 m2/g</li><li><strong>Pore volume:</strong> 0.8 ml/g</li><li><strong>Density:</strong> 450 g/l</li><li><strong>Applications:</strong> Peptides exceeding approximately 50 amino acids and oligonucleotides greater than 25 residues</li><li><strong>Customize: </strong>Bioanalysis requires a lot of flexibility in the pore size, the pH range, the temperatures and the solvents used. To achieve this, we cross phase limits.</li></ul><h4><strong>Characteristics&nbsp;</strong></h4><ul><li>Eurosil Bioselect columns are available in 4 modifications, useful for a wide range of separation tasks involving large molecules up to 100 000 Da.</li><li>Strict manufacturing procedures ensure a very narrow pore size distribution.</li><li>Interfering anions or heavy metal ions on the silica surface are not present in Eurosil Bioselect columns because only ultra pure silica gel and high quality chemical modifications are employed.</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_85cfc2d201.jpg" alt="KNAUER: Eurosil Bioselect" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_85cfc2d201.jpg 222w," sizes="100vw" width="1114" height="782"></p><h4><strong>Separation mechanism of Eurosil Bioselect</strong></h4><p>To separate larger molecules, they need to freely access the interior of the pores of the packing material. Therefore, the analytes’ diameter must be smaller than the average pore diameter.&nbsp;</p><p>For higher molecular weight solutes, the use of lower pore size materials (60-120 Å) as typically used for the analysis of small molecules may result restricted diffusion in the material´s pores and therewith reduced column efficiency.&nbsp;</p><h4><strong>Modifications</strong></h4><p>The recommended modification of Eurosil Bioselect depends on the molecular weight of the analytes.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg" alt="KNAUER: Eurosil Bioselect - chemical modifications" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_KNAUER_Eurosil_Bioselect_chemical_modifications_1fd5d87f7b.jpg 245w," sizes="100vw" width="955" height="505"><br>&nbsp;</p>

Products from category Analytical HPLC columns focused on Consumables - page 11

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