EU Regulation 396/2005: Pesticide Residue Testing and the Critical Role of QuEChERS Evaporation in Food Safety

<div><div><p><strong>Researchers led by </strong><a target="_blank" rel="noopener noreferrer" href="https://kudova.group.uochb.cz/en"><strong>Eva Kudová</strong></a><strong> from IOCB Prague and Jitka Viktorová from UCT Prague have identified new androstane-based steroid derivatives that can significantly improve the effectiveness of existing antibiotics against multidrug-resistant </strong><i><strong>Staphylococcus aureus</strong></i><strong>.</strong></p></div></div><div><p>The team screened dozens of natural steroidal hormones and synthetic derivatives to see whether they could block bacterial efflux pumps – mechanisms that bacteria use to eject antibiotics and survive treatment. Two compounds emerged as particularly promising: they inhibited efflux pumps and lowered the effective doses of antibiotics such as ciprofloxacin and erythromycin.</p><p>Further analysis showed that one of the compounds also suppressed genes linked to bacterial virulence. Another key finding is that the most active molecules are non-toxic to human immune cells and showed no detectable endocrine activity, suggesting a favorable safety profile.</p><p>These findings support the idea that rationally designed steroid-based molecules could act as antibiotic adjuvants, helping existing drugs overcome bacterial resistance.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/IOCB_Prague_Steroidal_hormones_and_neurosteroids_novel_therapeutic_strategies_in_bacterial_infections_8e5d2a7b48.jpg" alt="IOCB Prague: Steroidal hormones and neurosteroids – novel therapeutic strategies in bacterial infections" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_IOCB_Prague_Steroidal_hormones_and_neurosteroids_novel_therapeutic_strategies_in_bacterial_infections_8e5d2a7b48.jpg 222w," sizes="100vw" width="1258" height="886"></p><blockquote><h4><strong>Original Article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://www.sciencedirect.com/science/article/pii/S0223523426001613?via%3Dihub"><strong>Steroidal hormones and neurosteroids - novel therapeutic strategies in bacterial infections: Design, synthesis, and biological evaluation</strong></a></h4><p>Daniela Brdová, Bára Křížkovská, Jan Špaček, Zdeněk Míchal, Eva Jablonská, Ondřej Strnad, Hana Chodounská, Eszter Szánti-Pintér, Marina Morozovová, Václav Hanžl, Jan Tkadlec, Martijn Riool, Jan Lipov, Jitka Viktorová, Eva Kudová&nbsp;</p><p><i><strong>Eur. J. Med. Chem., 2026, 308, 118716</strong></i></p><p><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1016/j.ejmech.2026.118716">https://doi.org/10.1016/j.ejmech.2026.118716</a></p><h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><h4><strong>Abstract</strong></h4><p>The global rise of antibiotic resistance necessitates novel therapeutic strategies for infectious diseases. Inhibition of bacterial efflux pumps, which contribute to multidrug resistance, represents a promising approach to restore or even increase the efficacy of existing antibiotics. Using fluorescence-based ethidium bromide accumulation, broth microdilution, and checkerboard assays, we evaluated 26 endogenous steroidal hormones and neurosteroids, along with 30 synthetic derivatives, for their ability to enhance antibiotic susceptibility in multidrug-resistant <i>Staphylococcus aureus</i>. Structure-activity relationship analysis identified compounds <strong>13</strong> and <strong>16</strong> as lead candidates, exhibiting strong efflux pump inhibition and marked reductions in the minimum inhibitory concentrations of ciprofloxacin and erythromycin. Both compounds showed additive effects in checkerboard assays. Modifications at C-3 (polar substitution) and C-17 (3α,5β-stereochemistry and nonpolar substitution) were essential for potent efflux inhibition and sensitization, although these modifications were not additive when combined. Transcriptome analysis further revealed that compound <strong>13</strong> significantly downregulated <i>S. aureus</i> virulence-associated genes when administered alone or in combination with antibiotics. Cytotoxicity assessment in human peripheral blood mononuclear cells and receptor transactivation assays for estrogen, androgen, and progesterone receptors indicated that the most active derivatives were non-toxic and lacked detectable endocrine activity, suggesting a favorable safety profile. Overall, these findings support the concept that rationally designed andostane-based steroidal scaffolds can function as competitive bacterial efflux pump inhibitors and serve as potential antibiotic adjuvants to mitigate efflux-mediated resistance.</p><h4><strong>Instrumentation</strong></h4><h5><strong>Structural characterization</strong></h5><ul><li><strong>AVANCE III 400 MHz NMR spectrometer</strong> (Bruker)</li><li><a target="_blank" rel="noopener noreferrer" href="https://lcms.labrulez.com/library?mainauthorItems=3&amp;search=LTQ+Orbitrap+XL"><strong>LTQ Orbitrap XL HRMS</strong></a> (Thermo Fisher Scientific, ESI)</li></ul></div>

Steroidal hormones and neurosteroids – novel therapeutic strategies in bacterial infections

<p><strong>Metformin is currently the first-line oral drug of choice for the treatment of type 2 diabetes. It reduces glucose production in the liver, improves tissue sensitivity to insulin, and does not cause weight gain or hypoglycemia, which sets it apart from some other antidiabetic drugs. Moreover, its long-term beneficial effects on the risk of cardiovascular complications and mortality in people with type 2 diabetes have been well established. Researchers from the Institute of Physiology CAS (IPHYS) have identified a new group of blood metabolites that could help physicians objectively monitor whether patients with type 2 diabetes are taking their metformin as prescribed.</strong></p><h4><strong>New biomarkers for metformin use</strong></h4><p>A team led by Tomáš Čajka from the Laboratory of Translational Metabolism at IPHYS analyzed plasma samples from <strong>637 patients with type 2 diabetes treated with metformin</strong> and <strong>143 non-diabetic controls</strong> using advanced metabolomics and lipidomics. Among 614 detected metabolites, they identified five from the group of <strong>N-lactoyl-amino acids </strong>(e.g. N‑lactoyl-phenylalanine), which had previously been seen as unknown signals due to missing reference spectra in databases. The levels of these metabolites in the blood closely reflected the plasma concentrations of metformin. In patients with the highest metformin exposure, the concentrations of these metabolites were up to 7.2 times higher than in controls.</p><h4><strong>A sensitive “fingerprint” of the drug’s effect</strong></h4><p>N-Lactoyl-amino acids are formed in cells by combining lactate and amino acids, thus reflecting the metformin-induced changes in cellular energy metabolism. “<i>Importantly, even though they occur in plasma only at nanomolar concentrations, they reliably distinguish patients who take metformin regularly from those who take it irregularly or not at all</i>,” emphasizes T. Čajka.</p><h4><strong>Metabolomics in practice and international collaboration</strong></h4><p>The study also provides a detailed description of broader metabolic changes in type 2 diabetes, including increases in lactate, organic acids, and branched-chain amino acids, as well as extensive remodelling of the lipid profile. In addition to T. Čajka’s team, collaborators from the Institute for <strong>Clinical and Experimental Medicine in Prague</strong> and the <strong>West Coast Metabolomics Center</strong> (University of California, Davis) also participated in the study.</p><p>The results demonstrate that advanced metabolomics approaches developed at IPHYS within the <strong>CarDia project</strong> can find highly practical applications both in clinical studies and in personalized monitoring of treatment in patients with diabetes.</p><blockquote><h4><strong>The original article</strong></h4><h4><a target="_blank" rel="noopener noreferrer" href="https://ascpt.onlinelibrary.wiley.com/doi/10.1002/cpt.70205"><strong>Untargeted Metabolomics Identifies N-Lactoyl-Amino Acids as Dose-Responsive Plasma Biomarkers of Metformin Adherence in Type 2 Diabetes</strong></a></h4><p>Tomas Cajka, Jiri Hricko, Lucie Rudl Kulhava, Michaela Paucova, Michaela Novakova, Veronika Hola, Stanislava Rakusanova, Oliver Fiehn, Vojtech Skop, Ivana Lankova, Iva Miskova, Terezie Pelikanova, Martin Haluzik</p><p>Clin Pharmacol Ther, 119: 1057-1069</p><p><a target="_blank" rel="noopener noreferrer" href="https://doi.org/10.1002/cpt.70205">https://doi.org/10.1002/cpt.70205</a></p><h6>licensed under <a target="_blank" rel="noopener noreferrer" href="https://creativecommons.org/licenses/by/4.0/"><strong>CC-BY 4.0</strong></a></h6></blockquote><h4><strong>Abstract</strong></h4><p>Metformin is the most widely prescribed antidiabetic drug, yet adherence remains difficult to objectively assess. Using untargeted metabolomics and lipidomics, we analyzed plasma from 637 patients with type 2 diabetes (T2D) with confirmed metformin use and 143 nondiabetic controls, annotating 614 metabolites. Patients were stratified by plasma metformin into sub-therapeutic, therapeutic, and supra-therapeutic groups, and associations were evaluated by multiple linear regression and composite metabolite ranking. Five previously unannotated features were structurally identified as N-lactoyl-amino acids, whose levels correlated strongly with plasma metformin (ρ = 0.42–0.55, P &lt; 0.0001) and increased up to 7.2-fold in the supra-therapeutic group (&gt; 2000 ng/mL). While N-lactoyl-amino acids were consistently detected in the nanomolar range, they still displayed robust and dose-dependent associations with metformin. Broader metabolic changes in T2D included elevated lactate, organic acids, and branched-chain amino acids, together with reduced urea cycle metabolites. Lipidomics showed increases in saturated triacylglycerols and diacylglycerols and decreases in cholesteryl esters, sphingomyelins, and phospholipids. These findings establish N-lactoyl-amino acids as robust, dose-responsive plasma biomarkers of metformin exposure. Despite being up to four orders of magnitude less abundant than their amino acid precursors, they sensitively reflect mitochondrial lactate overflow and pharmacodynamic adaptation, offering objective assessment of adherence.</p>

New blood biomarkers reveal how faithfully diabetes patients take metformin

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The Czech Academy of Sciences (CAS) was established by Act No. 283/1992 Coll. as the Czech successor of the former Czechoslovak Academy of Sciences. It is set up as a complex of 54 public research institutions.

Czech Academy of Sciences

The Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences (IOCB Prague) is a leading scientific institution in the Czech Republic, recognized internationally. Its primary mission is basic research in the fields of chemical biology and medicinal chemistry, organic and material oriented chemistry, chemistry of natural compounds, biochemistry and molecular biology, physical chemistry, theoretical chemistry, and analytical chemistry. 

Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences

Organomation, founded in 1959, designs and manufactures high-quality nitrogen evaporators and extraction systems. Known for innovation and durability, their lab instruments are used globally for efficient sample preparation with strong customer support.

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Thermo Scientific Syncronis C18 Columns

Achieve repeatable and consistent liquid chromatography (LC) separations using Thermo Scientific™ Syncronis™ C18 columns. 

<p><strong>Achieve repeatable and consistent liquid chromatography (LC) separations using Thermo Scientific™ Syncronis™ C18 columns. Highly pure, high surface area silica and dense stationary phase coverage minimize secondary interactions and ensure robust, high-resolution separations.&nbsp;</strong></p><p>Double end-capping provides extra surface coverage and inertness toward basic compounds. Manufactured and rigorously tested in ISO 9000 facilities, these columns are designed to meet a range of analytical needs including fast method development, quantitative analysis, and quality control.</p><h5><strong>Highly Reproducible Separations</strong></h5><ul><li>Rigorously tested stationary phase bonded to the highest quality silica ensures consistent, predictable LC performance.</li></ul><h5><strong>Excellent Peak Shapes for Enhanced Resolution and Sensitivity</strong></h5><ul><li>Dense surface coverage of silica minimizes secondary interactions and peak tailing</li><li>Double endcapped for extra surface coverage</li></ul><h5><strong>Exceptional Column-to-Column Consistency</strong></h5><ul><li>Manufactured, packed, and tested in ISO-9000-accredited facilities</li><li>Every column individually tested to meet stringent retention, efficiency, and peak symmetry specifications</li><li>Enhanced automated packing process</li></ul><h5><strong>Available in Three Particle Sizes</strong></h5><ul><li>1.7 μm for rapid ultrahigh-performance LC (UHPLC) separations, and 3 μm and 5 μm for more traditional HPLC analysis</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Column type:</strong> Reversed Phase</li><li><strong>Endcapped:</strong> yes</li><li><strong>Max. Pressure:</strong> 5800 psi (400 bar)</li><li><strong>Packing Material:</strong> Spherical, Fully Porous, Ultrapure Silica</li><li><strong>Stationary phase:</strong> C18</li><li><strong>USP Type:</strong> L1</li><li><strong>Surface Area:</strong> 320 m<sup>2</sup>/g</li><li><strong>Temperature:</strong> 60°C</li><li><strong>Carbon load: </strong>16%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>100 Å</li><li><strong>pH: </strong>2 to 9</li></ul><h4><strong>Syncronis HPLC and UHPLC Columns</strong></h4><h5><strong>Enter a new world of chromatography</strong></h5><p>When developing a new method, one of the most important goals for the chromatographer is to achieve a consistent, reproducible separation. This makes selecting an HPLC column that offers highly-reproducible results essential to attaining this goal.</p><h5><strong>Features of Syncronis columns</strong></h5><p>Thermo Scientific Syncronis LC columns achieve high levels of consistency and reproducibility through:</p><ul><li>Highly-pure, high-surface-area silica</li><li>Dense bonding and double endcapping</li><li>Stringent manufacturing and testing protocols</li></ul>

Thermo Scientific Syncronis C18 HPLC Columns

Attain repeatable and consistent LC separations for your scale up purification needs with Thermo Scientific™ Syncronis™ C18 reversed phase preparative HPLC columns. 

<p><strong>Attain repeatable and consistent LC separations for your scale up purification needs with Thermo Scientific™ Syncronis™ C18 reversed phase preparative HPLC columns. These preparative HPLC columns have extremely pure, high surface area silica with dense stationary phase coverage to minimize secondary interactions and ensure robust, high-resolution separations. Double endcapping provides additional surface coverage and inertness toward basic compounds. Columns come in a variety of dimensions and an option for XtendedLife hardware which improves column lifetime by maintaining a uniform packed bed.</strong></p><h5><strong>Highly Reproducible Separations</strong></h5><ul><li>Rigorously tested stationary phase bonded to the highest quality silica ensures consistent, predictable LC performance.</li></ul><h5><strong>Enhanced Resolution and Sensitivity</strong></h5><ul><li>Dense surface coverage of silica minimizes secondary interactions and peak tailing.</li><li>Double endcapped for extra surface coverage.<br>C18 (USP L1) selectivity.</li></ul><p><strong>Preparative HPLC Column Hardware Options</strong> - based on column inner diameter (i.d.) and column performance needs.</p><h5><strong>Standard Threaded and Standard Flange Hardware</strong></h5><ul><li>Designed for standard applications, expertly packed and robustly designed to provide versatile products for routine use.</li><li>Standard threaded hardware for column i.d. &lt; 40mm.</li><li>Standard flange hardware for column i.d. ≥ 40mm.</li><li>Standard hardware can be modified on request to be compatible with SFC.</li></ul><h5><strong>XtendedLife Hardware</strong></h5><ul><li>Improves column lifetime by incorporating an internal Dynamic Axial Compression (DAC) system, ensuring the media bed is continuously packed tightly.</li><li>Compatible with SFC and is available in dimensions up to 50mm i.d.</li></ul><p>Preparative Guards are a proven and cost effective way to extend the lifetime of your prep column. Our preparative guard columns require the use of a preparative guard holder.</p><h5><strong>Customer Specific Orders</strong></h5><p>If there is a Thermo Scientific stationary phase you are currently using and would like to obtain in a preparative scale not shown or would like to discuss a specific column dimension, we would be happy to discuss your requirements.<br>Please contact your local sales representative for Customer Specific Orders.<br>Custom built columns are not eligible for returns.</p><h4><strong>Specifications</strong></h4><ul><li><strong>Column type:</strong> Reversed Phase</li><li><strong>Endcapped:</strong> yes</li><li><strong>Max. Pressure:</strong> 4300 psi (295 bar)</li><li><strong>Packing Material:</strong> Spherical, Fully Porous, Ultrapure Silica</li><li><strong>Stationary phase:</strong> C18</li><li><strong>USP Type:</strong> L1</li><li><strong>Surface Area:</strong> 320 m<sup>2</sup>/g</li><li><strong>Temperature:</strong> 60°C</li><li><strong>Carbon load: </strong>16%</li><li><strong>Phase:</strong> Reversed Phase</li><li><strong>Pore Size: </strong>100 Å</li><li><strong>pH: </strong>2 to 9</li></ul><h4><strong>Syncronis HPLC and UHPLC Columns</strong></h4><h5><strong>Enter a new world of chromatography</strong></h5><p>When developing a new method, one of the most important goals for the chromatographer is to achieve a consistent, reproducible separation. This makes selecting an HPLC column that offers highly-reproducible results essential to attaining this goal.</p><h5><strong>Features of Syncronis columns</strong></h5><p>Thermo Scientific Syncronis LC columns achieve high levels of consistency and reproducibility through:</p><ul><li>Highly-pure, high-surface-area silica</li><li>Dense bonding and double endcapping</li><li>Stringent manufacturing and testing protocols</li></ul>

Thermo Scientific Syncronis C8 HPLC Columns

Improve the consistency and reliability of your liquid chromatography (LC) separations using Thermo Scientific™ Syncronis™ C8 LC columns.

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Thermo Scientific Syncronis HILIC HPLC Columns

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The polar end-capped C18 phase in Thermo Scientific Syncronis aQ Column provides optimal retention of polar analytes and is fully compatible with 100% aqueous mobile phases. 

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<p><strong>Deliver excellent results for fast isocratic separations of inorganic anions in diverse matrices with the Thermo Scientific™ Dionex™ IonPac™ AS14 Carbon Eluent Anion-Exchange Column. This universal column for the separation of inorganic anions delivers improved peak resolution and retention of fluoride in applications performed previously with the Dionex IonPac AS4A, AS4A-SC and AS12A columns, however, the Dionex IonPac AS22 Carbonate Eluent Anion-Exchange column, an advanced carbonate eluent column, is recommended for fast analysis of inorganic anions.</strong></p><h5><strong>Fast Separation of Inorganic Anions in Diverse Matrices</strong></h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Method 300.0 (A)</li><li>Separation of common inorganic anions in 13 min in drinking water, wastewater, food &amp; beverages, scrubber solutions, and other diverse sample matrices</li><li>Superior retention and quantification of fluoride, glycolate, acetate, and formate</li><li>Compatible with a sodium tetraborate gradient to optimize difficult separations</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li></ul><h5><strong>Multiple Formats Available for Application Flexibility</strong></h5><ul><li>4x250mm, 2x250mm analytical columns</li><li>4x50mm, 2x50mm guard columns</li><li>Longer 25mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul><p><i><strong>Note: </strong>Use with the Dionex IonPac AS14 Eluent Concentrate for simple, accurate eluent preparation.</i></p><h4><strong>Specifications</strong></h4><ul><li><strong>Anion Exchange Capacity:</strong> 65 μeq</li><li><strong>Crosslinking: </strong>55% DVB</li><li><strong>Column Capacity:</strong> 65 μeq</li><li><strong>Column Chemistry:</strong> Carbonate/Bicarbonate</li><li><strong>For Use With (Application):</strong> Analysis of Fluorides and Other Inorganic Anions</li><li><strong>Ion Exchange Group: </strong>Alkyl Quaternary Ammonium</li><li><strong>Max. Pressure:</strong> 4000 psi (275 bar)</li><li><strong>Solvent Compatibility:</strong> pH 2 to 12, 0 to 100% HPLC Solvents</li><li><strong>Stationary phase:</strong> IonPac AS14</li><li><strong>Format:</strong> Standard Bore</li><li><strong>Packing Material: </strong>Ethylvinylbenzene/Divinylbenzene</li><li><strong>pH: </strong>2<strong> </strong>to 12</li></ul>

Thermo Scientific Dionex IonPac AS14A IC Columns

Thermo Scientific Dionex IonPac AS14A IC Column is high capacity anion-exchange column for fast isocratic separation of inorganic anions in environmental matrices

<p><strong>Deliver fast isocratic separation of inorganic anions from diverse and complex matrices such as drinking water, wastewater, foods and beverages, and scrubber solutions with the Thermo Scientific™ Dionex™ IonPac™ AS14A Carbon Eluent Anion-Exchange Column. The Dionex IonPac AS14A column meets or exceeds the requirements of U.S EPA Method 300.0 (A). However, the Dionex IonPac AS22 Carbonate Eluent Anion-Exchange column, an advanced carbonate eluent column, is recommended for fast analysis of inorganic anions. For the fastest separation of inorganic anions using a carbonate/bicarbonate eluent, the Dionex IonPac AS22-Fast column is recommended.</strong></p><h5><strong>Fast Separation of Inorganic Anions in Diverse Matrices</strong></h5><ul><li>Compliance monitoring of common anions in drinking water as specified in U.S. EPA Method 300.0 (A)</li><li>Separation of common inorganic anions in 8 min (3 x 150mm format) or 13 min (4 x 250mm format) in diverse sample matrices</li><li>Superior retention and quantification of fluoride</li><li>Compatible with sodium or potassium hydroxide gradient to optimize difficult separations</li><li>Solvent compatibility permits easy column cleanup after the analysis of samples with hydrophobic components.</li></ul><h5><strong>Multiple Formats Available for Application Flexibility</strong></h5><ul><li>4x250mm, 3x150mm analytical columns</li><li>4x50mm, 3x30mm guard columns</li><li>Longer 250mm columns facilitate higher resolution separations of more complex sample matrices</li><li>Shorter 150mm columns produce faster runs of relatively clean matrices</li><li>Smaller i.d. columns provide higher mass sensitivity, eluent and reagent conservation and lower operating costs</li></ul><p><i><strong>Note: </strong>Use with the Dionex IonPac AS14 Eluent Concentrate and the Combined Seven Anion Standard for simple, accurate eluent preparation.</i></p><h4><strong>Specifications</strong></h4><ul><li><strong>Anion Exchange Capacity:</strong> 65 μeq</li><li><strong>Crosslinking: </strong>55% DVB</li><li><strong>Column Capacity:</strong> 120 μeq</li><li><strong>Column Chemistry:</strong> Carbonate/Bicarbonate</li><li><strong>For Use With (Application):</strong> Anion Exchange</li><li><strong>Ion Exchange Group: </strong>Alkyl Quaternary Ammonium</li><li><strong>Max. Pressure:</strong> 4000 psi (275 bar)</li><li><strong>Solvent Compatibility:</strong> pH 2 to 11, 0 to 100% HPLC Solvents</li><li><strong>Stationary phase:</strong> IonPac AS14A</li><li><strong>Format:</strong> Standard Bore</li><li><strong>pH: </strong>2<strong> </strong>to 11</li></ul>

Thermo Scientific Dionex IonPac AS15 IC Columns

Determine trace-level concentrations of inorganic anions and low-molecular-weight organic acids in high-purity water matrices with the Thermo Scientific Dionex IonPac AS15 Capillary, Analytical & Guard Columns.

<p><strong>Determine trace-level concentrations of inorganic anions and low-molecular-weight organic acids in high-purity water matrices with the Thermo Scientific™ Dionex™ IonPac™ AS15 Capillary, Analytical &amp; Guard Columns. Specifically designed for analysis of trace anions in high-purity water matrices used by the semiconductor and power generation industries, the column delivers high sensitivity and superior resolution of early-eluting anions (e.g., fluoride, glycolate, acetate, and formate). The column is optimized for selective at an operating temperature of 30°C, and it is ideal for use with large-loop injections.</strong></p><h5><strong>Available in Multiple Formats</strong></h5><ul><li>Dionex IonPac AS15-5μm (3x150mm) column for high efficiency, fast analysis (15 min)</li><li>Dionex IonPac AS15-9μm (2x250mm, 4x250mm, and 0.4x250mm) columns for higher-capacity applications</li><li>Dionex IonPac AS15 capillary column (0.4x250mm) delivers the performance of the standard bore version but requires only 1% of the eluent flow rate, which helps reduce operating costs</li></ul><h5><strong>For Best Performance</strong></h5><ul><li>Use the Thermo Scientific™ Dionex™ IonPac™ AC15 Concentrator column for ultratrace (part per trillion) analyses</li><li>Use a Dionex eluent generator for simplified eluent preparation</li><li>Use the Thermo Scientific™ Dionex™ Anion Self-Regenerating Suppressor (ASRS™ 300) or the Thermo Scientific™ Dionex™ Anion Capillary Electrolytic Suppressor (ACES™ 300) with the Dionex IonPac AS15 column for eluent suppression</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Anion Exchange Capacity:</strong> 225 μeq</li><li><strong>Crosslinking: </strong>55% DVB</li><li><strong>Column Capacity:</strong> 225 μeq</li><li><strong>Column Chemistry:</strong> Hydroxide</li><li><strong>For Use With (Application):</strong> Anion Exchange</li><li><strong>Ion Exchange Group: </strong>Alkanol Quaternary Ammonium Ion</li><li><strong>Max. Pressure:</strong> 4000 psi (275 bar)</li><li><strong>Solvent Compatibility:</strong> pH 0 to 14, 0 to 100% HPLC Solvents</li><li><strong>Stationary phase:</strong> IonPac AS15</li><li><strong>Format:</strong> Standard Bore</li><li><strong>Packing Material: </strong>Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS16 IC Columns

Measure trace perchlorate and other highly polarizable anions quickly and accurately in a variety of water matrices with the Thermo Scientific Dionex IonPac AS16 IC Columns.

<p><strong>Measure trace perchlorate and other highly polarizable anions quickly and accurately in a variety of water matrices with the Thermo Scientific™ Dionex™ IonPac™ AS16 IC Columns . This column simplifies the determination of polarizable anions, including thiosulfate, iodide, thiocyanate, and perchlorate using an isocratic hydroxide eluent. It is ideally suited for determination of trace perchlorate in drinking water in accordance with U.S. EPA Methods 314.0 and 314.1 (Primary Method).</strong></p><h5><strong>Designed for Simple, Sensitive Analysis</strong></h5><ul><li>Easily measure trace concentrations of perchlorate in drinking water, surface water, and ground water matrices using a large-loop injection</li><li>Separate hydrophobic anions (iodide, thiocyanate, and thiosulfate) in less than 20 min</li><li>Ideal for polyvalent anions, including polyphosphates and polycarboxylates</li><li>Ultralow hydrophobicity allows fast analysis of polarizable anions</li><li>Can be used in the second dimension of the 2D-IC method for the analysis of trace perchlorate (sub ppb) in drinking water</li></ul><h5><strong>Available in Multiple Formats</strong></h5><ul><li>Standard bore (4x250mm) and microbore (2x250mm) formats</li></ul><h4><strong>Specifications</strong></h4><ul><li><strong>Anion Exchange Capacity:</strong> 170 μeq</li><li><strong>Crosslinking: </strong>55% DVB</li><li><strong>Column Capacity:</strong> 170 μeq</li><li><strong>Column Chemistry:</strong> Hydroxide</li><li><strong>For Use With (Application):</strong> Anion Exchange</li><li><strong>Ion Exchange Group: </strong>Alkanol Quaternary Ammonium Ion</li><li><strong>Max. Pressure:</strong> 4000 psi (275 bar)</li><li><strong>Solvent Compatibility:</strong> pH 0 to 14, 0 to 100% HPLC Solvents</li><li><strong>Stationary phase:</strong> IonPac AS16</li><li><strong>Format:</strong> Standard Bore</li><li><strong>Packing Material: </strong>Ethylvinylbenzene/Divinylbenzene</li></ul>

Thermo Scientific Dionex IonPac AS17-C IC Columns

Quickly determine common inorganic anions in high-purity water matrices with the Thermo Scientific Dionex IonPac AS17-C column. 

<p><strong>Quickly determine common inorganic anions in high-purity water matrices with the Thermo Scientific™ Dionex IonPac AS17-C column. This low-capacity column is optimized for fast gradient separation of inorganic anions in simple sample matrices. It is also ideal for fast gradient separation of sulfur species, including sulfite, sulfate, and thiosulfate. The Dionex IonPac AS17C column is the recommended replacement for all Dionex IonPac AS17 column anion applications.</strong></p><h5><strong>Make Gradient Separations as Easy as Isocratic Runs</strong></h5><p>The Dionex IonPac AS17-C column is designed to be used in conjunction with the Dionex Eluent Generator. The Dionex Eluent Generator automatically produces potassium hydroxide eluents from water, making gradient separations as easy as isocratic runs. Using the Dionex Eluent Generator under gradient conditions, common inorganic anions can easily be separated in a variety of sample matrices including high purity water, drinking water, wastewater, process streams, and scrubber solutions.</p><h5><strong>Achieve Superior Chromatographic Performance</strong></h5><ul><li>Fast gradient separation of inorganic anions in high purity water matrices</li><li>Easy suppression of hydroxide eluent to a very low background with the Thermo Scientific™ Dionex™ Anion Self-Regenerating Suppressor (ASRS™ 300) for trace level determinations (including fluoride) even with a large loop injection</li><li>Superior retention and quantification of fluoride, acetate, propionate, and formate</li><li>Meets performance requirements specified in U.S. EPA Method 300.0 (A)</li><li>Operates at ambient or elevated temperatures</li><li>Column selectivity is optimized for operating temperature of 30°C to ensure reproducible results</li><li>Compatible with Reagent-Free™ Ion Chromatography (RFIC™) systems</li><li>Compatible with organic solvents to enhance analyte solubility, modify column selectivity, or for effective column clean-up</li></ul><p><strong>Note:</strong><i> The Thermo Scientific™ Dionex™ IonPac™ AS18 column is the recommended hydroxide-selective column for determination of common anions in diverse sample matrices.</i></p><h4><strong>Specifications</strong></h4><ul><li><strong>Anion Exchange Capacity:</strong> 30 μeq</li><li><strong>Crosslinking: </strong>55% DVB</li><li><strong>Column Capacity:</strong> 30 μeq</li><li><strong>Column Chemistry:</strong> Hydroxide</li><li><strong>For Use With (Application):</strong> Anion Exchange</li><li><strong>Ion Exchange Group: </strong>Alkanol Quaternary Ammonium Ion</li><li><strong>Max. Pressure:</strong> 4000 psi (275 bar)</li><li><strong>Solvent Compatibility:</strong> pH 0 to 14, 0 to 100% HPLC Solvents</li><li><strong>Stationary phase:</strong> IonPac AS17-C</li><li><strong>Format:</strong> Standard Bore</li><li><strong>Packing Material: </strong>Ethylvinylbenzene/Divinylbenzene</li></ul>

Products from category HPLC columns - page 7

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