Troubleshooting LC Systems
Troubleshooting LC Systems

Author: John W. Dolan

Publisher: Springer Science & Business Media

Published: 1989-03-01

Total Pages: 518

ISBN-13: 1592596401

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Over the last 15 years, high-performance liquid chromatogra phy (LC) has made the transition from an instrument used only by experts in research labs to a tool used for routine applications by relatively unskilled workers. With this transition have come in instrumentation and column technology. In major advances the past, the operator had to be a jack-of-all-trades, with a screw driver, soldering iron, and various wrenches as constant compan ions in the LC lab. Today, many instruments contain micropro cessors as powerful as those of mainframe computers of earlier days. With this technology has come a variety of self-diagnostic tools that allow the LC system to locate many of its own prob lems. Traditionally, well-honed LC troubleshooting skills have been a result of years of work at the bench. Today the LC system itself often can do a better job of troubleshooting than the operator can. Yet many of the problems of the past are still the major problems of today: air bubbles, check valves, detector lamps, and, of course, problems with the separation. An added pressure on the operator of today's LC system is that of productivity-the lab often cannot afford unnecessary downtime. This means that the operator has to be a troubleshooting expert, or has to have that expertise at his or her fingertips. The present book was written to provide this expertise in an easy-to-use format for users at all levels of experience.

Troubleshooting LC Systems
Troubleshooting LC Systems

Author: John W. Dolan

Publisher: Humana Press

Published: 2013-03-20

Total Pages: 515

ISBN-13: 9781475768794

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Over the last 15 years, high-performance liquid chromatogra phy (LC) has made the transition from an instrument used only by experts in research labs to a tool used for routine applications by relatively unskilled workers. With this transition have come in instrumentation and column technology. In major advances the past, the operator had to be a jack-of-all-trades, with a screw driver, soldering iron, and various wrenches as constant compan ions in the LC lab. Today, many instruments contain micropro cessors as powerful as those of mainframe computers of earlier days. With this technology has come a variety of self-diagnostic tools that allow the LC system to locate many of its own prob lems. Traditionally, well-honed LC troubleshooting skills have been a result of years of work at the bench. Today the LC system itself often can do a better job of troubleshooting than the operator can. Yet many of the problems of the past are still the major problems of today: air bubbles, check valves, detector lamps, and, of course, problems with the separation. An added pressure on the operator of today's LC system is that of productivity-the lab often cannot afford unnecessary downtime. This means that the operator has to be a troubleshooting expert, or has to have that expertise at his or her fingertips. The present book was written to provide this expertise in an easy-to-use format for users at all levels of experience.

Introduction to Modern Liquid Chromatography
Introduction to Modern Liquid Chromatography

Author: Lloyd R. Snyder

Publisher: John Wiley & Sons

Published: 2011-09-20

Total Pages: 831

ISBN-13: 1118210395

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The latest edition of the authoritative reference to HPLC High-performance liquid chromatography (HPLC) is today the leading technique for chemical analysis and related applications, with an ability to separate, analyze, and/or purify virtually any sample. Snyder and Kirkland's Introduction to Modern Liquid Chromatography has long represented the premier reference to HPLC. This Third Edition, with John Dolan as added coauthor, addresses important improvements in columns and equipment, as well as major advances in our understanding of HPLC separation, our ability to solve problems that were troublesome in the past, and the application of HPLC for new kinds of samples. This carefully considered Third Edition maintains the strengths of the previous edition while significantly modifying its organization in light of recent research and experience. The text begins by introducing the reader to HPLC, its use in relation to other modern separation techniques, and its history, then leads into such specific topics as: The basis of HPLC separation and the general effects of different experimental conditions Equipment and detection The column—the "heart" of the HPLC system Reversed-phase separation, normal-phase chromatography, gradient elution, two-dimensional separation, and other techniques Computer simulation, qualitative and quantitative analysis, and method validation and quality control The separation of large molecules, including both biological and synthetic polymers Chiral separations, preparative separations, and sample preparation Systematic development of HPLC separations—new to this edition Troubleshooting tricks, techniques, and case studies for both equipment and chromatograms Designed to fulfill the needs of the full range of HPLC users, from novices to experts, Introduction to Modern Liquid Chromatography, Third Edition offers the most up-to-date, comprehensive, and accessible survey of HPLC methods and applications available.

More Practical Problem Solving in HPLC
More Practical Problem Solving in HPLC

Author: Stavros Kromidas

Publisher: John Wiley & Sons

Published: 2008-01-08

Total Pages: 309

ISBN-13: 3527612319

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A unique approach to solving HPLC problems. Everyone who bought "Problem Solving in HPLC" by Stavros Kromidas will equally benefit from nearly 100 new practical examples for optimization, trouble-shooting, and instrument performance given in this sequel. The author provides - guidance for selecting and evaluating methods, intstruments and columns, - practical help with everyday trouble-shooting, - advice for optimizing separations, always explaining the reason why. In each case the problem, the solution and the conclusions are presented over a maximum of 4 pages, and in addition the book contains manufacturers' addresses, references, data tables and checklists.

LC/MS
LC/MS

Author: Marvin C. McMaster

Publisher: John Wiley & Sons

Published: 2005-08-08

Total Pages: 184

ISBN-13: 0471736570

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A practical guide to using and maintaining an LC/MS system The combination of liquid chromatography (LC) and mass spectrometry(MS) has become the laboratory tool of choice for a broad range ofindustries that require the separation, analysis, and purificationof mixtures of organic compounds. LC/MS: A Practical User's Guide provides LC/MS users with aneasy-to-use, hands-on reference that focuses on the practicalapplications of LC/MS and introduces the equipment and techniquesneeded to use LC/MS successfully. Following a thorough explanationof the basic components and operation of the LC/MS system, theauthor presents empirical methods for optimizing the techniques,maintaining the instrumentation, and choosing the appropriate MS orLC/MS analyzer for any given problem. LC/MS covers everything users need to know about: The latest equipment, including quadrupole, time-of-flight, andion trap analyzers Cutting-edge processes, such as preparing HPLC mobile phasesand samples; handling and maintaining a wide variety of silica,zirconium, and polymeric separation columns; interpreting andquantifying mass spectral data; and using MS interfaces Current and future applications in the pharmaceutical andagrochemical industries, biotechnology, clinical research,environmental studies, and forensics An accompanying PowerPoint® slide-set on CD-ROM provides vitalteaching tools for instructors and new equipment operators.Abundantly illustrated and easily accessible, the text is designedto help students and practitioners acquire optimum proficiency inthis powerful and rapidly advancing analytical application.

High-Performance Gradient Elution
High-Performance Gradient Elution

Author: Lloyd R. Snyder

Publisher: John Wiley & Sons

Published: 2007-01-09

Total Pages: 496

ISBN-13: 0470055510

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Gradient elution demystified Of the various ways in which chromatography is applied today, few have been as misunderstood as the technique of gradient elution, which presents many challenges compared to isocratic separation. When properly explained, however, gradient elution can be less difficult to understand and much easier to use than often assumed. Written by two well-known authorities in liquid chromatography, High-Performance Gradient Elution: The Practical Application of the Linear-Solvent-Strength Model takes the mystery out of the practice of gradient elution and helps remove barriers to the practical application of this important separation technique. The book presents a systematic approach to the current understanding of gradient elution, describing theory, methodology, and applications across many of the fields that use liquid chromatography as a primary analytical tool. This up-to-date, practical, and comprehensive treatment of gradient elution: * Provides specific, step-by-step recommendations for developing a gradient separation for any sample * Describes the best approach for troubleshooting problems with gradient methods * Guides the reader on the equipment used for gradient elution * Lists which conditions should be varied first during method development, and explains how to interpret scouting gradients * Explains how to avoid problems in transferring gradient methods With a focus on the use of linear solvent strength (LSS) theory for predicting gradient LC behavior and separations by reversed-phase HPLC, High-Performance Gradient Elution gives every chromatographer access to this useful tool.

Modern HPLC for Practicing Scientists
Modern HPLC for Practicing Scientists

Author: Michael W. Dong

Publisher: John Wiley & Sons

Published: 2016-04-06

Total Pages: 285

ISBN-13: 111929360X

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A comprehesive yet concise guide to Modern HPLC Written for practitioners by a practitioner, Modern HPLC for Practicing Scientists is a concise text which presents the most important High-Performance Liquid Chromatography (HPLC) fundamentals, applications, and developments. It describes basic theory and terminology for the novice, and reviews relevant concepts, best practices, and modern trends for the experienced practitioner. Moreover, the book serves well as an updated reference guide for busy laboratory analysts and researchers. Topics covered include: HPLC operation Method development Maintenance and troubleshooting Modern trends in HPLC such as quick-turnaround and "greener" methods Regulatory aspects While broad in scope, this book focuses particularly on reversed-phase HPLC, the most common separation mode, and on applications for the pharmaceutical industry, the largest user segment. Accessible to both novice and intermedate HPLC users, information is delivered in a straightforward manner illustrated with an abundance of diagrams, chromatograms, tables, and case studies, and supported with selected key references and Web resources. With intuitive explanations and clear figures, Modern HPLC for Practicing Scientists is an essential resource for practitioners of all levels who need to understand and utilize this versatile analytical technology.

High-Performance Liquid Chromatography of Peptides and Proteins
High-Performance Liquid Chromatography of Peptides and Proteins

Author: Colin T. Mant

Publisher: CRC Press

Published: 2017-11-22

Total Pages: 960

ISBN-13: 1351440756

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This book consists of a series of 82 precise, easy-to-read articles by internationally renowned scientists and emphasizes the practical approach to HPLC with minimal theory, although the underlying principles for peptide and protein separations are clearly expressed. All of the major modes of microbore, ultrafast and analytical HPLC are discussed, including size-exclusion, ion-exchange, reversed-phase, hydrophobic interaction, and affinity and immunoaffinity chromatography. A section on preparative HPLC, including displacement techniques, is also presented. Problem-solving approaches to the separation of various classes of biologically active peptides and proteins are thoroughly explored, while the importance of peptide standards for monitoring column performance and for optimizing separation conditions is emphasized. Several articles focus on the choice of the correct detection method (electrochemical, UV, fluorescence), as well as the need for a proper knowledge of approaches to column and instrument maintenance and trouble-shooting. A section on predictive approaches deals with both computer simulation of peptide separations and peptide structure. The book also includes complementary techniques to HPLC, as well as other useful applications of HPLC. It enables both novice and experienced chromatographers to realize the full potential of this extremely powerful technique, in the process making an important contribution to scientific literature.

HPLC and UHPLC for Practicing Scientists
HPLC and UHPLC for Practicing Scientists

Author: Michael W. Dong

Publisher: John Wiley & Sons

Published: 2019-07-23

Total Pages: 410

ISBN-13: 1119313767

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A concise yet comprehensive reference guide on HPLC/UHPLC that focuses on its fundamentals, latest developments, and best practices in the pharmaceutical and biotechnology industries Written for practitioners by an expert practitioner, this new edition of HPLC and UHPLC for Practicing Scientists adds numerous updates to its coverage of high-performance liquid chromatography, including comprehensive information on UHPLC (ultra-high-pressure liquid chromatography) and the continuing migration of HPLC to UHPLC, the modern standard platform. In addition to introducing readers to HPLC’s fundamentals, applications, and developments, the book describes basic theory and terminology for the novice, and reviews relevant concepts, best practices, and modern trends for the experienced practitioner. HPLC and UHPLC for Practicing Scientists, Second Edition offers three new chapters. One is a standalone chapter on UHPLC, covering concepts, benefits, practices, and potential issues. Another examines liquid chromatography/mass spectrometry (LC/MS). The third reviews at the analysis of recombinant biologics, particularly monoclonal antibodies (mAbs), used as therapeutics. While all chapters are revised in the new edition, five chapters are essentially rewritten (HPLC columns, instrumentation, pharmaceutical analysis, method development, and regulatory aspects). The book also includes problem and answer sections at the end of each chapter. Overviews fundamentals of HPLC to UHPLC, including theories, columns, and instruments with an abundance of tables, figures, and key references Features brand new chapters on UHPLC, LC/MS, and analysis of recombinant biologics Presents updated information on the best practices in method development, validation, operation, troubleshooting, and maintaining regulatory compliance for both HPLC and UHPLC Contains major revisions to all chapters of the first edition and substantial rewrites of chapters on HPLC columns, instrumentation, pharmaceutical analysis, method development, and regulatory aspects Includes end-of-chapter quizzes as assessment and learning aids Offers a reference guide to graduate students and practicing scientists in pharmaceutical, biotechnology, and other industries Filled with intuitive explanations, case studies, and clear figures, HPLC and UHPLC for Practicing Scientists, Second Edition is an essential resource for practitioners of all levels who need to understand and utilize this versatile analytical technology. It will be a great benefit to every busy laboratory analyst and researcher.

Sample Introduction Systems in ICPMS and ICPOES
Sample Introduction Systems in ICPMS and ICPOES

Author: Diane Beauchemin

Publisher: Newnes

Published: 2020-03-15

Total Pages: 588

ISBN-13: 0444594833

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Sample Introduction Systems in ICPMS and ICPOES provides an in-depth analysis of sample introduction strategies, including flow injection analysis and less common techniques, such as arc/spark ablation and direct sample insertion. The book critically evaluates what has been accomplished so far, along with what can be done to extend the capabilities of the technique for analyses of any type of sample, such as aqueous, gaseous or solid. The latest progress made in fields, such as FIA, ETV, LC-ICP-MS and CE-ICP-MS is included and critically discussed. The book addresses problems related to the optimization of the system, peak dispersion and calibration and automatization. - Provides contributions from recognized experts that give credibility to each chapter as a reference source - Presents a single source, providing the big picture for ICPMS and ICPOES - Covers theory, methods, selected applications and discrete sampling techniques - Includes access to core data for practical work, comparison of results and decision-making