Professor Michaela Rumlová, head of a research group of the National Institute of Virology and Bacteriology at UCT Prague (and Vice-Rector for doctoral studies), holder of a licensed patent &nbsp;for antiretroviral testing assays, and recipient of the Czech Science Foundation’s President’s Award for HIV research, has also become the principal investigator of the bilateral INTER-EXCELLENCE II project “Cellular factors regulating the export and packaging of unspliced ​​retroviral RNA”, starting this year. In this interview, she explains how retroviruses such as HIV “hack” the cell in order to export their own genome from the nucleus into the cytoplasm, and then to the site where it is specifically packaged into nascent viral particles, a key step in viral replication. Her team is collaborating with the NIH (National Institutes of Health) and Rockefeller University to elucidate mechanisms that may help reveal new vulnerable points in the retrovirus replication cycle while simultaneously clarifying related cellular processes.<h5>Could you describe your project and its main objectives?</h5>Retroviruses, such as HIV, are viruses that carry genetic information in the form of RNA; however, after entering a cell, they are able to reverse transcribe it into DNA and integrate it into the host genome. In order to replicate, they must transport their genetic information—in the form of unspliced RNA—from the nucleus into the cytosol. There, it serves both as a template for the production of viral proteins and as the genome of new viral particles. This is highly unusual, as the cell very carefully controls which RNA molecules are allowed to leave the nucleus. Normal protein-coding cellular RNAs, known as messenger RNAs (mRNAs), must undergo splicing—a processing step in which certain segments are removed—before being exported. When this process fails, mRNA that retains these segments is held back in the nucleus as part of quality control and subsequently degraded. Retroviruses have managed to outwit this cellular control machinery, allowing their unspliced RNA to pass into the cytoplasm.Our project focuses on identifying the cellular proteins that assist retroviruses in this step and on the mechanism by which protein complexes bound to viral RNA are remodelled during RNA transport. The goal is to understand how the virus uses cellular mechanisms to its advantage and how this pathway is linked to the subsequent fate of the RNA, i.e. to its translation and packaging into new viral particles.<h5>Why is this export of unspliced ​​RNA so important for retroviral replication?</h5>Because this RNA has a dual role for the virus. On the one hand, it serves as a template for synthesizing viral proteins in the cytoplasm; on the other, it represents the genetic material itself, which must be packaged into new viral particles. The virus must package its RNA genome in its unspliced form, as only this RNA contains essential sequences without which further viral replication would be impossible.Simply put: the virus needs to get a complete copy of its genetic instructions out of the nucleus. Once the viral RNA is in the cytoplasm, it can be used as a template for synthesizing viral proteins; and a portion of these RNA molecules is then selected and packaged into a new particle as a genome. We are interested in how the virus forces the cell to allow viral RNA that is, from the cell’s perspective, “unfinished,” that is unspliced, to leave the nucleus. We are also investigating how the cell and the virus together - albeit unintentionally from the cell’s perspective - determine which RNA molecule will be translated into proteins and which will be packaged as the genome. This is one of the key, yet still not fully understood, steps of retroviral replication.<h5>What do you think it was about your project that impressed the Ministry of Education, Youth and Sports’ jury the most?</h5>I believe the decisive factor was a combination of several elements. First, the reviewers were primarily interested in the scientific problem itself. We are investigating a mechanism that is essential for retroviruses, but still not sufficiently understood, which may also have broader implications for the regulation of cellular processes. In addition, the quality of the team, our strong collaboration with the NIH and Rockefeller University, and the use of modern methods that will allow us to track viral RNA in great detail also played a role. It was also important that the project has clear objectives and a realistic plan.<h5>How will this research contribute to the development of new treatments for retroviral infections?</h5>It is important to say that this is primarily basic research. Rather than developing a new drug directly, we are trying to understand, at the molecular level, the step that the virus cannot do without. Only when we fully understand the mechanism of these cellular processes and identify the essential factors for the export of unspliced ​​RNA and how they function, will we be able to better determine which interactions or mechanisms represent potentially vulnerable points. Similar mechanisms associated with the export of unspliced ​​mRNA also appear in some diseases, such as cancer, so I &nbsp;see the benefit of our research mainly in that it will refine our understanding of these pathological processes in the cell, and retroviruses help us do so. Therefore, our work on retroviruses not only shows us how the virus works, but also how the cell itself works.<h5>What responsibilities does your UCT Prague team have? How does the collaboration with your American partners work?</h5>At UCT Prague, we are conducting the project’s primary experimental work. Our research involves cell cultures, viral models, and various biochemical techniques ranging from immunochemistry to microscopy that allow us to track viral RNA and identify its cellular partners. In collaboration with colleagues from NIH, Frederick, we are developing single-particle tracking methods to observe viral RNA movement in living cells across both space and time. Furthermore, we are working with colleagues from Rockefeller University to employ iCLIP methods for the precise mapping of protein-binding sites on RNA. Both collaborations are valuable to us, because they are not just about data sharing, but also about the transfer of expertise and detailed know-how.<h5>Who else is collaborating on the project?</h5>At UCT Prague, we collaborate closely with the Department of Biotechnology and the Department of Biochemistry and Microbiology. Externally, we work with colleagues from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague) and the Central European Institute of Technology in Brno (CEITEC). Our research naturally necessitates the integration of diverse fields of expertise; it requires combining virology, cell biology, and biochemistry with advanced imaging and modern approaches to study RNA-protein interactions. This is exactly what makes our project capable of addressing complex questions that a single laboratory cannot tackle on its own.<h5>Are there plans to continue the project? Have you brought on new collaborators, and are you looking to welcome new colleagues to the team?</h5>Yes, definitely. In basic research, it often happens that one answered question opens up several more. High-quality, properly interpreted data provide a foundation you can build on — and that is what moves scientists forward. It is already clear that the topic of retroviral RNA export and packaging has broader implications and may reveal more general principles of how RNA functions within the cell. We also hope the project will be attractive to students, as it connects classical molecular biology, biochemistry, and virology with cutting-edge biotechnological methods. Students are already involved in the project as part of their bachelor’s and master’s theses.<h5>What was the personal turning point that motivated you to pursue a long-term investigation into retroviral particles?</h5>I first encountered retroviruses in the early 1990s during my diploma thesis, when I was working at IOCB Prague on HIV-1 protease inhibitors. At that time, AIDS could not yet be effectively treated, and retrovirus research had a completely different dimension. From the very beginning, I was fascinated by how such a relatively small and simple virus can outsmart evolutionarily highly optimized cellular processes and turn them to its own advantage. And that has never stopped fascinating me. From a scientific point of view, retroviruses are remarkable; just consider one of their enzymes, reverse transcriptase, without which no diagnostic or research laboratory in the world could function today. Without it, it would be impossible to diagnose RNA viruses like SARS-CoV-2, influenza, or HIV using RT-PCR tests, or, for example to produce recombinant human proteins in bacterial cells.

Tracking unspliced RNA: Professor Rumlová studies how retroviruses “hack” cells

News from LabRulezLCMS Library - Week 20, 2026

🎤Lindsay Repka&nbsp;Lindsay Repka is a chemistry professor at Middlebury College whose research explores photoredox chemistry, catalyst stability, and visible-light-driven transformations. Her lab emphasizes both mechanistic insight and hands-on student training in advanced analytical instrumentation.In this episode of Concentrating on Chromatography, we sit down with Lindsay Repka to discuss how LC-MS and GC-MS transformed her lab’s approach to photoredox chemistry.What began as a project to develop a visible-light photocrosslinking handle unexpectedly led to a major discovery: the solvent (DMF) was reacting with the photocatalyst itself. Using high-resolution LC-MS, Lindsay’s team observed multiple solvent adducts forming — sometimes with complete catalyst consumption. That discovery reshaped their research direction.This episode is a rare deep dive into both LC-MS and GC-MS within the same research project, showing how chromatography-driven insight can turn unexpected degradation into productive new reactivity.If you work in:<ul><li>Photoredox chemistry</li><li>Reaction optimization</li><li>Mass spectrometry method development</li><li>Catalyst screening</li><li>Academic synthetic chemistry</li></ul>…this conversation will resonate.<h4>Key Topics Covered</h4><ul><li>Photocatalyst stability in DMF, DCE, and MeCN</li><li>Demethylation under mild visible-light conditions</li><li>High-resolution Q-TOF LC-MS quantitation</li><li>Internal standard methodology in GC-MS</li><li>Signal-to-noise improvement using extracted ion chromatograms</li><li>Reaction reproducibility and quality control strategy</li></ul><h3>Video Transcription</h3>In this interview, Lindsay Repka discusses the role of photoredox chemistry in method development, photocrosslinking, solvent activation, catalyst stability, and the use of LC-MS and GC-MS to understand reaction pathways.<h4>What is photoredox chemistry?</h4>Photoredox chemistry uses light to activate a photocatalyst, which can either donate or accept an electron from a substrate. This generates radical species that can undergo new types of reactivity.Repka explains that one of the key advantages of photoredox chemistry is its ability to operate under mild conditions, often using visible light. This makes it attractive for sensitive molecules and biological systems, including potential applications in drug release, live-cell chemistry, and drug development.<h4>Photocrosslinking and drug-target interactions</h4>Repka’s group initially aimed to develop visible-light photocrosslinking methods to study drug interactions with biological targets. Photocrosslinking can covalently link a drug to its target, making it easier to identify the biological target of a compound.Traditional photocrosslinking often uses UV light, but visible light offers milder and more biologically compatible conditions.<h4>From photocrosslinking to solvent activation</h4>The project shifted direction when the desired photocrosslinking reactions gave very low yields. Instead of reacting with amino acids as intended, the radical intermediate mainly reacted with itself.The team explored different solvents to stabilize the radical, but found that some solvents, such as DMF, were not inert. Instead, the solvent reacted with the photocatalyst or radical species, revealing unexpected solvent activation chemistry.<h4>Why LC-MS was critical</h4>LC-MS became essential because the reaction mixtures were too complex and low-yielding for NMR or GC-MS. High-resolution LC-MS allowed the team to detect minor products, identify photocatalyst modifications, and observe solvent addition products with high confidence.Repka emphasizes that LC-MS was both a qualitative and quantitative tool. It was used quantitatively to measure how much photocatalyst remained after light exposure, and qualitatively to identify degradation products and new reactivity pathways.<h4>Photocatalyst stability workflow</h4>The team developed a systematic workflow to evaluate photocatalyst stability under light exposure. Because catalyst degradation was time-sensitive, reproducibility required strict control of experimental conditions.Key steps included using a glove box, commercial deoxygenated solvents, accurate weighing on a microbalance, controlled light exposure in a photoreactor, and temperature control with a chiller. These precautions helped reduce day-to-day variability and enabled reproducible measurements of catalyst remaining.<h4>Quantifying catalyst remaining by LC-MS</h4>Calibration curves were prepared using pure photocatalyst solutions and LC-MS ion areas. The team worked in the nanomolar range to maintain linearity.Instead of relying only on total ion chromatograms, they used extracted ion chromatograms (EICs) to improve signal-to-noise for the photocatalyst signal. Baseline subtraction was also applied to reduce noise and improve quantitation at low concentrations.Calibration curves and quality control samples were prepared and measured on the same day as the reaction samples, because LC-MS signal intensity can vary significantly from day to day.<h4>Why GC-MS was used later</h4>For demethylation studies, the group moved to GC-MS because the substrates and products were small and volatile enough for gas chromatography. GC-MS was better suited for rapidly screening many reaction conditions, including different photocatalysts, solvents, and oxidants.Instead of generating full calibration curves for every experiment, the team used an internal standard to streamline analysis and determine percent conversion based on relative response factors.<h4>Practical lessons from the project</h4>Repka highlights the importance of careful sample preparation, especially when working with very small quantities of photocatalysts. A high-quality microbalance, stable granite platform, antistatic tools, and aluminum weigh boats improved weighing accuracy and reproducibility.She also argues that mass spectrometry should be a standard part of photoredox method development because it can reveal minor products, support reaction optimization, and provide insights that may be difficult or impossible to obtain by NMR alone.<h4>Final perspective</h4>Beyond the chemistry, Repka emphasizes the importance of student training and mentoring. For her, research is not only about discovering new reactivity but also about giving students practical experience, helping them develop independence, and preparing them for future scientific careers.<blockquote>This text has been automatically transcribed from a video presentation using AI technology. It may contain inaccuracies and is not guaranteed to be 100% correct.</blockquote><blockquote><h4>Concentrating on Chromatography Podcast</h4>Dive into the frontiers of chromatography, mass spectrometry, and sample preparation with host David Oliva. Each episode features candid conversations with leading researchers, industry innovators, and passionate scientists who are shaping the future of analytical chemistry. From decoding PFAS detection challenges to exploring the latest in AI-assisted liquid chromatography, this show uncovers practical workflows, sustainability breakthroughs, and the real-world impact of separation science. Whether you’re a chromatographer, lab professional, or researcher you'll discover inspiring content!You can find Concentrating on Chromatography Podcast in podcast apps:<ul><li><a target="_blank" rel="noopener noreferrer" href="https://open.spotify.com/show/1wZg67rCjoGju4yhqxI3tL">Spotify</a></li><li><a target="_blank" rel="noopener noreferrer" href="https://podcasts.apple.com/tz/podcast/concentrating-on-chromatography/id1788429185">Apple podcast</a></li><li><a target="_blank" rel="noopener noreferrer" href="https://podscan.fm/podcasts/concentrating-on-chromatography">podscan</a></li></ul>and on <a target="_blank" rel="noopener noreferrer" href="https://www.youtube.com/@ChromatographyTalk/videos">YouTube channel</a></blockquote>

Using LC-MS & GC-MS to Decode Photoredox Catalyst Stability

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The University of Chemistry and Technology, Prague is a natural centre of first-rate study and research in the area of chemistry in Czechia and is one of the country's largest educational and research institutions focused on technical chemistry, chemical and biochemical technologies, material and chemical engineering, food chemistry, and environmental studies.

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<h3>Solving Problems That Matter - a Waters webinar series featuring USP speakers</h3><h4>Episode 9: Nitrosamines</h4>When present in pharmaceutical products, nitrosamine impurities - a probable carcinogen - can disrupt drug supply chains and lead to shortages resulting from product recalls and withdrawals.Join our panelists Naiffer Romero from the USP and Marian Twohig from Waters Corporation as they address analytical challenges in the detection and control of nitrosamines and Nitrosamine Drug-Substance Related Impurities (NDSRIs).Key learning objectives:<ul><li>Understand the current analytical challenges associated with the detection and control of nitrosamine impurities. Explore fit-for-purpose and compliant-ready LC-MS-MS solutions for the cGMP laboratory.</li></ul>Who should attend:<ul><li>Pharmaceutical scientists involved with the detection and control of nitrosamines impurities</li></ul><blockquote>Presenter: Naiffer Romero, MSc, MPH (Principal Scientist - Scientific Affairs, US Pharmacopeia)</blockquote><blockquote>Naiffer has more than 20 years of pharmaceutical industry experience. In his 13+ years tenure with USP, he has served several roles: Lead scientist in the dosage form performance laboratory, reference standard development team, Manager in charge of LATAM Compendial engagement and education, responsible for stakeholders and national regulatory bodies engagement. Naiffer is also a certified USP Education instructor. Most recently, Naiffer joined USP's Scientific Affairs performance cell, where he leads scientific outreach and engagement for LATAM &amp; U.S. on key national health priority topics. His combined pharmaceutical expertise includes Analytical Development, salt and polymorph selection, Development of dissolution methods, IVIVC modeling, and impurity analytical strategy. Naiffer also serves as a member of USP's Nitrosamine Steering Committee and community host to 'Nitrosamine Exchange,' a knowledge community in All-things Nitrosamine. Naiffer also liaises technical discussion on pharmacopeial collaboration, including international meetings of World Pharmacopeias (part of WHO).</blockquote><blockquote>Presenter: Marian Twohig, Ph.D. (Consultant Scientist, Waters Corporation)</blockquote><blockquote>Marian has over 20 years of experience supporting quantitative and qualitative applications in the pharmaceutical, food and environmental and materials science industries. She works as a Consultant Scientist for Waters Corporation where she has previously held several Senior Scientist positions. Currently, the focus of Marian’s work is in the development of quantitative analytical methods to meet the needs of the pharmaceutical industry. She is particularly interested in chromatographic separations and the application of combining low- and high-resolution mass spectral data with other chemical information for identification of unknown chemical entities. Marian holds a Ph.D. in Analytical Chemistry from Munster Technological University, Cork, Ireland.</blockquote><blockquote>Moderator: Isabelle Vu Trieu (Pharmaceutical Market Development Manager, Americas, Waters Corporation)</blockquote><blockquote>Isabelle is a business development professional dedicated to delivering benefits to analytical scientists in the life sciences industry. With over 20 years of experience in providing chromatography and mass spectrometry solutions, Isabelle is particularly interested in helping pharmaceutical scientists achieve the data quality and integrity needed to drive decisions for drug quality, safety and efficacy. Isabelle joined Waters in 2009 and currently manages the development of the pharmaceutical market in the Americas. She holds Masters’ degrees in Chemistry from Columbia University and the University Claude Bernard in Lyon, France as well as a Chemical Engineering degree from Ecole Supérieure de Chimie Physique Electronique in Lyon, France.</blockquote>

Waters Corporation: Solving Problems That Matter - a Waters webinar series featuring USP speakers

Nitrosamines

This webinar will address analytical challenges in the detection and control of nitrosamines and Nitrosamine Drug-Substance Related Impurities (NDSRIs).

Hydrophilic interaction liquid chromatography (HILIC) and hydrophobic interaction chromatography (HIC) separations are becoming more common for a variety of applications. We see HIC being a primary method being used for antibody-drug-conjugate (ADCs) analyses and equally suitable for the analysis of protein modifications. The ability to retain neutral and ionizable polar species makes HILIC particularly popular for drug development and metabolomics studies.
This webinar will help new HILIC and HIC chromatographers avoid the common mistakes of HILIC and HIC separations by identifying the important method parameters involved. We’ll discuss how the separation works, show detailed application examples, and provide tip and tricks for robust method development.
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Presenter: Mohit Patel (Application Engineer, Agilent Technologies, Inc.)
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Mohit Patel is part of the CSD Online AE Team. His primary focus is to support SMLC, Bio-Columns, and consumables.
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Before joining Agilent, Mohit was an Assistant Professor of Chemistry at Temple University. Mohit developed his passion for science through his experiences as a faculty researcher and a mentor. Mohit actively taught, developed curriculum, and served as senior personnel, with a leadership position, on funded grants, mentored research projects, and co-coordinator of STEAM related outreach services.
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Mohit has earned a Doctorate degree in Chemistry from Temple University in 2016.
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Agilent Technologies: Why Use HILIC or HIC Chromatography: Theory and Method Development Strategies

Why Use HILIC or HIC Chromatography: Theory and Method Development Strategies

This webinar will help new HILIC and HIC chromatographers avoid the common mistakes of HILIC and HIC separations.

HILIC or HIC: Theory and Method Development Strategies

In liquid chromatography, various detectors can be used. In this seminar we will take a closer look at UV, fluorescence, refractive index and ELSD detection.&nbsp;<blockquote>Presenter: Ansuman Mahato (Product Specialist Liquid Phase Separations, Agilent Technologies)Ansuman has been a Product Specialist at Agilent Technologies for 14 years, working with the pharmaceuticals, biopharmaceuticals, food, and chemicals industries. Based in Waldbronn, Germany, the manufacturing site for Agilent’s chromatography solutions, he helps make labs more efficient and compliant and has rich experience with techniques like HPLC, UHPLC, GPC/SEC, Prep LC, and 2D-LC.Ansuman is also skilled in polymer analysis using advanced tools like viscometry and MALS. He has published many papers in international journals and is a popular speaker for his practical insights and innovative solutions.</blockquote>

Agilent Technologies: HPLC Beginner Webinar Series

HPLC Detectors

In liquid chromatography, various detectors can be used. In this seminar we will take a closer look at UV, fluorescence, refractive index and ELSD detection.

This session will explore detectors commonly used in polymer analysis (RID, UV, MALS, Viscometer), emphasizing their specific applications based on polymer types (Branched, Linear, high Mw, low Mw).We will discuss their roles in Mw determination, Quantitation, Viscosity measurement, and size and shape determination etc.&nbsp;<blockquote>Presenter: Ansuman Mahato (Product Specialist Liquid Phase Separations, Agilent Technologies)Ansuman has been a Product Specialist at Agilent Technologies for 14 years, working with the pharmaceuticals, biopharmaceuticals, food, and chemicals industries. Based in Waldbronn, Germany, the manufacturing site for Agilent’s chromatography solutions, he helps make labs more efficient and compliant and has rich experience with techniques like HPLC, UHPLC, GPC/SEC, Prep LC, and 2D-LC.Ansuman is also skilled in polymer analysis using advanced tools like viscometry and MALS. He has published many papers in international journals and is a popular speaker for his practical insights and innovative solutions.</blockquote>

GPC/SEC Detector Selection

This session will explore detectors commonly used in polymer analysis (RID, UV, MALS, Viscometer).

When developing an LC method, there are various factors that can be tested to achieve the desired resolution and symmetry of the analytes.In this webinar we will discuss the various factors and give tips on developing a robust method.<blockquote>Presenter: Laura Montis (Product Specialist Liquid Phase Separations, Agilent)Laura began her carrier in the Liquid Chromatography over 15 years ago. After experiencing the pharmaceutical world in an analytical development lab, she went on to work with preparative chromatography and gained experience with Supercritical Fluid Chromatography prior to moving onto special HPLC applications, like 2DLC and Online LC.Throughout her career, Laura has held several positions, including application chemist, trainer, sales specialist, and marketing business development. She is currently Product Specialist for liquid phase chromatography systems within the International Distributor Organization in EMEA at Agilent Technologies.Laura studied analytical chemistry and holds a master’s degree from University of Lyon in France.</blockquote>

Method Development in HPLC

In this webinar we will discuss the various factors and give tips on developing a robust HPLC method.

<div data-lineheight="1.5">Food analysis is crucial for consumer safety, authenticity, and pollutant detection. Benchmark analytical methods use complex protocols and organic solvents, and more sustainable alternatives are to be sought out. A recent trend in analytical chemistry leverages raw data from experiments (e.g., chromatographic profiles, spectra) as sample fingerprints, analyzed with multivariate tools to predict characteristics (e.g., origin, composition) and identify adulterations. These approaches reduce analyses, lab work, and resource use, offering greener, more cost-effective alternatives.The webinar will show how to combine the two aims, sustainability and data maximization, using an aqueous colloidal system, developing AF4-DAD-MALS-dRI-FLD platforms to separate and characterize components from food matrices:</div><ul><li data-lineheight="1.5">Red wine profiling and in-depth analysis of output data can highlight particulate complexity, explain sensory feedback, and lead to cultivar grouping.</li><li data-lineheight="1.5">Milk analysis and multivariate elaboration of fractograms enabled single-run discrimination of factors like thermal treatment, fat content, and even the manufacturing plant’s impact on colloidal content.</li></ul>These AF4 method are fast, uses minimal sample preparation, avoid chemical treatments, offering a greener, faster and possibly cheaper alternative. The FFF approach can enhance food quality control and fraud detection processes and is adaptable to other colloidal food samples. Additionally, it underscores the need to increase multivariate analysis in data from FFF platforms.<h4>Key Learning Objectives:</h4><ul><li data-lineheight="1.5">Tackle native sample handling</li><li data-lineheight="1.5">Understanding data extraction from multidetection profiling</li><li data-lineheight="1.5">Rationalizing multivariate analysis of FFF data</li></ul><h4>Who Should Attend:</h4><ul><li data-lineheight="1.5">Laboratory managers</li><li data-lineheight="1.5">Chromatographers</li><li data-lineheight="1.5">Scientist in the Food &amp; beverage industry</li></ul><blockquote>Presenter: Valentina Marassi, Ph.D. (University of Bologna, byFlow srl)Dr. Marassi is Tenure-Track Researcher and Assistant Professor in Analytical Chemistry at the University of Bologna. She graduated with a B.S. in chemistry, a Master’s in Organic Chemistry and completed a PhD in Analytical Chemistry in the same Institution. Her core research involves separation science and profiling-multidetection applied to nano-bio samples, and developing FFF-chemometrics strategies to model and understand colloidal profiles.Presenter: Prof. Andrea Zattoni (University of Bologna, byFlow srl)Andrea Zattoni joined the University of Bologna in 2006 and is currently an Associate Professor. He holds an M.S. in Chemistry and a Ph.D. in Chemical Sciences from the University of Bologna with a research focus on separation science. His main research interests include the fundamental and instrumental development of field-flow fractionation and its combination with highly sensitive and selective detection techniques.Presenter: Udayabagya (Bud) Halim (Waters | Wyatt Technology)Bud Halim is a senior marketing analyst at Wyatt Technology. He holds a B.S. and Ph.D. in physical chemistry from the UCLA. Bud started his career as an adjunct professor where he taught courses such as Biochem, Analytical, and Physical Chemistr. Prior to joining Wyatt Technology, Bud worked in the scientific instrumentation field as an applications scientist for three years. His experience spans the characterization of batteries, semiconductors, and the stability of biologics, LNPs, and viral vectors.</blockquote>

Waters Corporation: Colloidal Fingerprints of Food and Beverages with multidetector AF4-MALS

Colloidal Fingerprints of Food and Beverages with multidetector AF4-MALS

How to combine sustainability and data maximization, using an aqueous colloidal system, developing AF4-DAD-MALS-dRI-FLD platforms.

Fingerprints of Food and Beverages with AF4-MALS

With an understanding of selectivity, and using a variety of chromatographic data, we discuss phase design principles and how it is possible to introduce functionality to enhance selectivity through different mechanisms such as hydrophobicity, π-π, dipole-dipole and shape selectivity interactions.This webinar is the second part in a three-part series by Gemma Lo, called "A Systematic UHPLC / HPLC Method Development Strategy with Complementary Stationary Phases to Maximize Selectivity and Resolution."Each part is about 20min long.Presenter: Gemma Lo

MAC MOD Analytical: Utilizing Stationary Phase Design in Method Development

Utilizing Stationary Phase Design in Method Development

We discuss phase design principles and how it is possible to introduce functionality to enhance selectivity through different mechanisms.

This course is designed to introduce those familiar with analytical-scale HPLC to capillary (or “nano”) liquid chromatography. Although both techniques are based on the same fundamental principles, capillary LC delivers a number of distinct advantages with appropriate use.Commercial instrument options, as well as the basics of preparing your own capillary LC columns, will be described. Because one of the most prominent uses of capillary LC is its coupling to mass spectrometry for complex biological sample analysis, special attention will be given to this important area. Both academic and industrial researchers will be able to apply the information gained through this course to successfully use this essential technique.After completing this course, participants will be able to:<ul><li>Understand the differences between analytical and capillary scale LC</li><li>Describe the fundamentals of capillary LC column preparation</li><li>Determine the best detection modes for a given application</li><li>Explain the advantages of coupling capillary LC with mass spectrometry and how to approach method development using capillary LC-MS</li><li>Identify best practices for the use of capillary LC to solve analytical challenges</li></ul><h5>Who Should Attend?</h5>Scientists, chemists, analytical researchers, lab directors and managers, VPs and directors of QC/QA, lab owners<blockquote>Presenter: Dr. James Grinias (Professor, Department of Chemistry &amp; Biochemistry, Rowan University)James Grinias is a Professor in the Department of Chemistry &amp; Biochemistry at Rowan University in Glassboro, New Jersey, USA. Dr. Grinias has a number of research interests focused on chemical separations and microfluidics, both at the fundamental level and for the analysis of biological systems. He is the recipient of the 2021 American Chemical Society Satinder Ahuja Award for Young Investigators in Separation Science and the 2022 LCGC Emerging Leader in Chromatography. At Rowan, he teaches courses in general, analytical, and bioanalytical chemistry while also conducting research on UHPLC column performance and instrument miniaturization.Presenter: Greg Ward (CEO, Axcend)Greg Ward serves as the CEO of Axcend, renowned for its portable high-performance liquid chromatography (HPLC) systems. Greg has over 30 years of experience in the technology and scientific instrumentation sectors. Before joining Axcend, Greg held technical and marketing roles at Hewlett Packard and Agilent Technologies. His leadership at Axcend has been pivotal in advancing the development and commercialization of the Axcend Focus LC®, a compact and eco-friendly HPLC system that has revolutionized the field by offering customers portability, ease of use, and reduced operational costs. Axcend has made significant strides in making high-quality chromatographic analysis accessible and convenient for various industries, including pharmaceuticals, environmental monitoring, and chemical manufacturing. Greg’s vision and dedication continue to push the boundaries of scientific analysis, making him a key leader in the field of compact liquid chromatography.</blockquote>

Separation Science: Introduction to Compact Liquid Chromatography

Introduction to Compact Liquid Chromatography

This course is designed to introduce those familiar with analytical-scale HPLC to capillary (or “nano”) liquid chromatography. 

<h5>Who Should Attend:</h5><ul><li>Any HPLC scientists beginning with method development&nbsp;or working with small molecules in pharmaceutical labs &nbsp;</li></ul><h5>Key Learning Points:</h5><ul><li>Learn about selectivity benefits of phenyl phases during reversed-phase HPLC</li><li>Review mobile-phase optimization when using a phenyl column</li><li>Examine a thorough comparison of different phenyl phases with a C18 phase</li></ul><blockquote>Presenter: Zachary Woodward (Senior Technical Specialist, Phenomenex)Zachary Woodward is a Senior Technical Specialist with Phenomenex, Inc, assisting laboratories with method development in the bio-pharma, environmental, and food industries. &nbsp;Zachary spent his formative years developing HPLC and GC methods with a pharmaceutical lab in Albany, NY, after which he developed HPLC and SPE methods in the clinical setting here in Southern California. &nbsp;Zachary received his B.Sci. in Chemistry from the College of William and Mary, was awarded his Master’s in Chemistry at San Diego State University, and is happy to speak with you today!</blockquote>

How to Choose a Phenyl Phase

Learn about selectivity benefits of phenyl phases during reversed-phase HPLC. Review mobile-phase optimization when using a phenyl column.

As CHO-based processes for recombinant proteins continue to have increased cell densities and titers, the need for advancement in clarification technologies is of importance to enable manufacturing scalability. A novel technology, anion exchange (AEX) fiber chromatography, aims to address this challenge and has proven to be scalable up to large commercial manufacturing. This approach combines the ease of filter-like flowthrough operation and scalability, as well as the separation precision of chromatography.Join Dr. Masa Nakamura, Senior Application Development Specialist, Solventum, as he showcases a new clarification platform strategy that can offer seamless implementation and deployment from discovery to clinical and commercial manufacturing. It can also provide consistent and high-quality clarified fluid to enhance commercialization productivity.Key learning objectives<ul><li>Learn about the application of synthetic fiber chromatography to the clarification unit operation</li><li>Explore a novel approach to harvest and clarification in CHO processes</li><li>Understand options to overcome scale up challenges and to reduce soluble impurities during clarification</li></ul>Who should attend?Scientists, Engineers, and Heads of process development, manufacturing, MSAT, and CMC from biopharmaceutical organizations focused on recombinant protein production in CHO expression systems.Certificate of attendanceAll webinar participants can request a certificate of attendance, including a learning outcomes summary, for continuing education purposes<blockquote>Presenter: Masa Nakamura, PhD (Senior Application Development Specialist, Solventum, Bioprocessing Filtration)</blockquote><div><blockquote>Dr. Masa Nakamura, Senior Application Development Specialist for Solventum, is responsible for developing new products and applications for biopharmaceutical clarification and purification processes, including the development of fiber chromatography products. He has over 25 years of bioseparation and bioengineering experience in academic and industry. He received his BS in Chemical Engineering and PhD in Biochemical Engineering from the University of Tokyo, Japan.Moderator: Matilde Marques (Life Sciences Assistant Editor, SelectScience)</blockquote></div>

SelectScience: Scalable chromatographic clarification platform for mAb manufacturing in CHO systems 

Scalable chromatographic clarification platform for mAb manufacturing in CHO systems 

A new clarification platform strategy that can offer seamless implementation and deployment from discovery to clinical and commercial manufacturing.

LCMS webinars focusing on HPLC - page 19