Author: G. Guiochon
Publisher: Elsevier
ISBN: 0080858473
Category : Science
Languages : en
Pages : 811
Book Description
Here is an invaluable new book on quantitative gas chromatography which explains how the method can - or should - be used for accurate and precise analysis. Gas chromatography is firmly established as one of the few major methods for the quantitative analysis of complex mixtures. It is fast, accurate and inexpensive, with a broad range of applications. It has however become very complex and involved: over 200 stationary phases, more than 10 detector principles and several very different column types are available from among the catalogs of over 100 manufacturers and major retailers. The progressive changes in the nature of gas chromatography have created new needs for information which are not satisfied by the literature presently available.This book provides a complete discussion of all the problems involved in the achievement of quantitative analysis by gas chromatography, whether in the research laboratory, in the routine analysis laboratory or in process control. For this reason the presentation of theoretical concepts has been limited to the essential, while extensive explanations have been devoted to the various steps involved in the derivation of precise and accurate data. This starts with the selection of the instrumentation and column, continues with the choice of optimum experimental conditions, then calibration and ends with the use of correct procedures for data acquisition and calculations. Finally, there is almost always a way to reduce errors and an entire chapter deals with this single issue. Numerous relevant examples are presented.The first part of the book presents the theoretical background, simple enough to be understood by all analytical chemists, but still complete and up-to-date. It discusses the problems of flow dynamics, retention and band broadening. The changes in band profile associated with column overloading are explained without much recourse to mathematics. The second part describes the gas chromatograph and discusses the properties of each of its parts: gas flow and pressure controller sampling system, oven, column switching valves, detectors. The different implementations, their advantages and drawbacks are discussed and compared. In addition, three chapters present packed column technology, open tubular column technology and some sophisticated new phase systems, respectively. The new phase systems described use adsorbents, modified by coating or grafting organic phase, and carrier gases containing vapors which are sorbed by the stationary phase and modify it, such as steam. The third part discusses the applications in qualitative and quantitative analysis. Calibration, peak integration, sources of errors arising from the various parts of the instrument as well as from the measurement process itself are carefully described in four detailed chapters. Methods to carry out accurate and precise analysis are presented. A last chapter is devoted to process control analysis and gives a number of detailed examples of applications. A lexicon explaining the most important chromatographic terms and a detailed index complete the book.This is a book which no chemical analyst should be without. It should be on the library shelf of all universities, instrument companies and any laboratory and plant where gas chromatography is used.
Quantitative Gas Chromatography for Laboratory Analyses and On-Line Process Control
Author: G. Guiochon
Publisher: Elsevier
ISBN: 0080858473
Category : Science
Languages : en
Pages : 811
Book Description
Here is an invaluable new book on quantitative gas chromatography which explains how the method can - or should - be used for accurate and precise analysis. Gas chromatography is firmly established as one of the few major methods for the quantitative analysis of complex mixtures. It is fast, accurate and inexpensive, with a broad range of applications. It has however become very complex and involved: over 200 stationary phases, more than 10 detector principles and several very different column types are available from among the catalogs of over 100 manufacturers and major retailers. The progressive changes in the nature of gas chromatography have created new needs for information which are not satisfied by the literature presently available.This book provides a complete discussion of all the problems involved in the achievement of quantitative analysis by gas chromatography, whether in the research laboratory, in the routine analysis laboratory or in process control. For this reason the presentation of theoretical concepts has been limited to the essential, while extensive explanations have been devoted to the various steps involved in the derivation of precise and accurate data. This starts with the selection of the instrumentation and column, continues with the choice of optimum experimental conditions, then calibration and ends with the use of correct procedures for data acquisition and calculations. Finally, there is almost always a way to reduce errors and an entire chapter deals with this single issue. Numerous relevant examples are presented.The first part of the book presents the theoretical background, simple enough to be understood by all analytical chemists, but still complete and up-to-date. It discusses the problems of flow dynamics, retention and band broadening. The changes in band profile associated with column overloading are explained without much recourse to mathematics. The second part describes the gas chromatograph and discusses the properties of each of its parts: gas flow and pressure controller sampling system, oven, column switching valves, detectors. The different implementations, their advantages and drawbacks are discussed and compared. In addition, three chapters present packed column technology, open tubular column technology and some sophisticated new phase systems, respectively. The new phase systems described use adsorbents, modified by coating or grafting organic phase, and carrier gases containing vapors which are sorbed by the stationary phase and modify it, such as steam. The third part discusses the applications in qualitative and quantitative analysis. Calibration, peak integration, sources of errors arising from the various parts of the instrument as well as from the measurement process itself are carefully described in four detailed chapters. Methods to carry out accurate and precise analysis are presented. A last chapter is devoted to process control analysis and gives a number of detailed examples of applications. A lexicon explaining the most important chromatographic terms and a detailed index complete the book.This is a book which no chemical analyst should be without. It should be on the library shelf of all universities, instrument companies and any laboratory and plant where gas chromatography is used.
Publisher: Elsevier
ISBN: 0080858473
Category : Science
Languages : en
Pages : 811
Book Description
Here is an invaluable new book on quantitative gas chromatography which explains how the method can - or should - be used for accurate and precise analysis. Gas chromatography is firmly established as one of the few major methods for the quantitative analysis of complex mixtures. It is fast, accurate and inexpensive, with a broad range of applications. It has however become very complex and involved: over 200 stationary phases, more than 10 detector principles and several very different column types are available from among the catalogs of over 100 manufacturers and major retailers. The progressive changes in the nature of gas chromatography have created new needs for information which are not satisfied by the literature presently available.This book provides a complete discussion of all the problems involved in the achievement of quantitative analysis by gas chromatography, whether in the research laboratory, in the routine analysis laboratory or in process control. For this reason the presentation of theoretical concepts has been limited to the essential, while extensive explanations have been devoted to the various steps involved in the derivation of precise and accurate data. This starts with the selection of the instrumentation and column, continues with the choice of optimum experimental conditions, then calibration and ends with the use of correct procedures for data acquisition and calculations. Finally, there is almost always a way to reduce errors and an entire chapter deals with this single issue. Numerous relevant examples are presented.The first part of the book presents the theoretical background, simple enough to be understood by all analytical chemists, but still complete and up-to-date. It discusses the problems of flow dynamics, retention and band broadening. The changes in band profile associated with column overloading are explained without much recourse to mathematics. The second part describes the gas chromatograph and discusses the properties of each of its parts: gas flow and pressure controller sampling system, oven, column switching valves, detectors. The different implementations, their advantages and drawbacks are discussed and compared. In addition, three chapters present packed column technology, open tubular column technology and some sophisticated new phase systems, respectively. The new phase systems described use adsorbents, modified by coating or grafting organic phase, and carrier gases containing vapors which are sorbed by the stationary phase and modify it, such as steam. The third part discusses the applications in qualitative and quantitative analysis. Calibration, peak integration, sources of errors arising from the various parts of the instrument as well as from the measurement process itself are carefully described in four detailed chapters. Methods to carry out accurate and precise analysis are presented. A last chapter is devoted to process control analysis and gives a number of detailed examples of applications. A lexicon explaining the most important chromatographic terms and a detailed index complete the book.This is a book which no chemical analyst should be without. It should be on the library shelf of all universities, instrument companies and any laboratory and plant where gas chromatography is used.
Instrument Engineers' Handbook, Volume One
Author: Bela G. Liptak
Publisher: CRC Press
ISBN: 1420064029
Category : Technology & Engineering
Languages : en
Pages : 1914
Book Description
Unsurpassed in its coverage, usability, and authority since its first publication in 1969, the three-volume Instrument Engineers' Handbook continues to be the premier reference for instrument engineers around the world. It helps users select and implement hundreds of measurement and control instruments and analytical devices and design the most cost-effective process control systems that optimize production and maximize safety. Now entering its fourth edition, Volume 1: Process Measurement and Analysis is fully updated with increased emphasis on installation and maintenance consideration. Its coverage is now fully globalized with product descriptions from manufacturers around the world. Béla G. Lipták speaks on Post-Oil Energy Technology on the AT&T Tech Channel.
Publisher: CRC Press
ISBN: 1420064029
Category : Technology & Engineering
Languages : en
Pages : 1914
Book Description
Unsurpassed in its coverage, usability, and authority since its first publication in 1969, the three-volume Instrument Engineers' Handbook continues to be the premier reference for instrument engineers around the world. It helps users select and implement hundreds of measurement and control instruments and analytical devices and design the most cost-effective process control systems that optimize production and maximize safety. Now entering its fourth edition, Volume 1: Process Measurement and Analysis is fully updated with increased emphasis on installation and maintenance consideration. Its coverage is now fully globalized with product descriptions from manufacturers around the world. Béla G. Lipták speaks on Post-Oil Energy Technology on the AT&T Tech Channel.
Handbook of Methods and Instrumentation in Separation Science
Author:
Publisher: Academic Press
ISBN: 0123757274
Category : Science
Languages : en
Pages : 881
Book Description
Handbook of Methods and Instrumentation in Separation Science, Volume 1 provides concise overviews and summaries of the main methods used for separation. It is based on the Encyclopedia of Separation Science. The handbook focuses on the principles of methods and instrumentation. It provides general concepts concerning the subject matter; it does not present specific procedures. This volume discusses the separation processes including affinity methods, analytical ultracentrifugation, centrifugation, chromatography, and use of decanter centrifuge and dye. Each methodology is defined and compared with other separation processes. It also provides specific techniques, principles, and theories concerning each process. Furthermore, the handbook presents the applications, benefits, and validation of the processes described in this book. This handbook is an excellent reference for biomedical researchers, environmental and production chemists, flavor and fragrance technologists, food and beverage technologists, academic and industrial librarians, and nuclear researchers. Students and novices will also find this handbook useful for practice and learning. - One-stop source for information on separation methods - General overviews for quick orientation - Ease of use for finding results fast - Expert coverage of major separation methods - Coverage of techniques for all sizes of samples, pico-level to kilo-level
Publisher: Academic Press
ISBN: 0123757274
Category : Science
Languages : en
Pages : 881
Book Description
Handbook of Methods and Instrumentation in Separation Science, Volume 1 provides concise overviews and summaries of the main methods used for separation. It is based on the Encyclopedia of Separation Science. The handbook focuses on the principles of methods and instrumentation. It provides general concepts concerning the subject matter; it does not present specific procedures. This volume discusses the separation processes including affinity methods, analytical ultracentrifugation, centrifugation, chromatography, and use of decanter centrifuge and dye. Each methodology is defined and compared with other separation processes. It also provides specific techniques, principles, and theories concerning each process. Furthermore, the handbook presents the applications, benefits, and validation of the processes described in this book. This handbook is an excellent reference for biomedical researchers, environmental and production chemists, flavor and fragrance technologists, food and beverage technologists, academic and industrial librarians, and nuclear researchers. Students and novices will also find this handbook useful for practice and learning. - One-stop source for information on separation methods - General overviews for quick orientation - Ease of use for finding results fast - Expert coverage of major separation methods - Coverage of techniques for all sizes of samples, pico-level to kilo-level
Data Analysis and Signal Processing in Chromatography
Author: A. Felinger
Publisher: Elsevier
ISBN: 0080525563
Category : Science
Languages : en
Pages : 427
Book Description
This book gives an overview of the numerical data analysis and signal treatment techniques that are used in chromatography and related separation techniques. Emphasis is given to the description of the symmetrical and asymmetrical chromatographic peak shape models. Both theoretical and empirical models are discussed.The fundamentals of data acquisition, types and effect of baseline noise, and methods of improving the signal-to-noise ratio (either in time or in frequency and wavelet domain) are thoroughly discussed. Resolution enhancement techniques, such as curve fitting, deconvolution by Fourier and wavelet transforms, iterative deconvolution, Kalman filtering and multivariate methods of curve resolution are all discussed with several chromatographic examples. Quantitative analysis by peak area of peak height measurement, the precision and accuracy of the quantitation of stand-alone or overlapping and symmetrical or asymmetrical peaks are treated. In a separate chapter, guidelines are given for the use of transform techniques for the analysis of chromatograms. A statistical description of peak overlap is given in the final chapters. Since the concept of resolution has to be reconsidered when one separates complex mixtures, the problem of resolution and overlap is quantitatively discussed by means of statistical methods, and by using Fourier analysis of the complex chromatogram.Features of this book• The ultimate source of numerical techniques to enhance chromatographic data• Gives a detailed description of signal and resolution enhancement techniques in a manner applicable for enhancing not only chromatography, but also spectroscopic and other analytical signals• The first book with a thorough overview of the statistics of peak overlap.This is the first volume to encompass both the simple and more sophisticated methods for the numerical treatment of chromatograms. It is, therefore, the fundamental resource of numerical analysis methods for every analyst.
Publisher: Elsevier
ISBN: 0080525563
Category : Science
Languages : en
Pages : 427
Book Description
This book gives an overview of the numerical data analysis and signal treatment techniques that are used in chromatography and related separation techniques. Emphasis is given to the description of the symmetrical and asymmetrical chromatographic peak shape models. Both theoretical and empirical models are discussed.The fundamentals of data acquisition, types and effect of baseline noise, and methods of improving the signal-to-noise ratio (either in time or in frequency and wavelet domain) are thoroughly discussed. Resolution enhancement techniques, such as curve fitting, deconvolution by Fourier and wavelet transforms, iterative deconvolution, Kalman filtering and multivariate methods of curve resolution are all discussed with several chromatographic examples. Quantitative analysis by peak area of peak height measurement, the precision and accuracy of the quantitation of stand-alone or overlapping and symmetrical or asymmetrical peaks are treated. In a separate chapter, guidelines are given for the use of transform techniques for the analysis of chromatograms. A statistical description of peak overlap is given in the final chapters. Since the concept of resolution has to be reconsidered when one separates complex mixtures, the problem of resolution and overlap is quantitatively discussed by means of statistical methods, and by using Fourier analysis of the complex chromatogram.Features of this book• The ultimate source of numerical techniques to enhance chromatographic data• Gives a detailed description of signal and resolution enhancement techniques in a manner applicable for enhancing not only chromatography, but also spectroscopic and other analytical signals• The first book with a thorough overview of the statistics of peak overlap.This is the first volume to encompass both the simple and more sophisticated methods for the numerical treatment of chromatograms. It is, therefore, the fundamental resource of numerical analysis methods for every analyst.
Protein Liquid Chromatography
Author: M. Kastner
Publisher: Elsevier
ISBN: 0080858694
Category : Science
Languages : en
Pages : 976
Book Description
Protein Liquid Chromatography is a handbook-style guide to liquid chromatography as a tool for isolating and purifying proteins, consisting of 25 individual chapters divided into three parts: Part A covers commonly-used, classic modes of chromatography such as ion-exchange, size-exclusion, and reversed-phase; Part B deals with various target protein classes such as membrane proteins, recombinant proteins, and glycoproteins; and Part C looks at various miscellaneous related topics, including coupling reaction, buffer solution additives, and software. The text as a whole can be viewed as a systematic survey of available methods and how best to use them, but also attempts to provide an exhaustive coverage of each facet. How to solve a specific problem using a chosen method is the overall essence of the volume. The principle philosophy of this compilation is that practical application is everything; therefore, both classical and modern methods are presented in detail, with examples involving conventional, medium- and high-pressure techniques. Over-exposure to history, concept, and theory has deliberately been avoided. The reader will find a wealth of tips and tricks from users for users, including advice on the advantages and disadvantages of each method. Easy-to-read sections on "Getting started now" and "Where to go from here" attempt to provide hands-on, fool-proof detailed practical procedures with complete and even standard model runs for any scientist or technician at work in this area.
Publisher: Elsevier
ISBN: 0080858694
Category : Science
Languages : en
Pages : 976
Book Description
Protein Liquid Chromatography is a handbook-style guide to liquid chromatography as a tool for isolating and purifying proteins, consisting of 25 individual chapters divided into three parts: Part A covers commonly-used, classic modes of chromatography such as ion-exchange, size-exclusion, and reversed-phase; Part B deals with various target protein classes such as membrane proteins, recombinant proteins, and glycoproteins; and Part C looks at various miscellaneous related topics, including coupling reaction, buffer solution additives, and software. The text as a whole can be viewed as a systematic survey of available methods and how best to use them, but also attempts to provide an exhaustive coverage of each facet. How to solve a specific problem using a chosen method is the overall essence of the volume. The principle philosophy of this compilation is that practical application is everything; therefore, both classical and modern methods are presented in detail, with examples involving conventional, medium- and high-pressure techniques. Over-exposure to history, concept, and theory has deliberately been avoided. The reader will find a wealth of tips and tricks from users for users, including advice on the advantages and disadvantages of each method. Easy-to-read sections on "Getting started now" and "Where to go from here" attempt to provide hands-on, fool-proof detailed practical procedures with complete and even standard model runs for any scientist or technician at work in this area.
Modified Nucleosides in Cancer and Normal Metabolism - Methods and Applications
Author:
Publisher: Elsevier
ISBN: 008085852X
Category : Science
Languages : en
Pages : 509
Book Description
Modified Nucleosides in Cancer and Normal Metabolism - Methods and Applications
Publisher: Elsevier
ISBN: 008085852X
Category : Science
Languages : en
Pages : 509
Book Description
Modified Nucleosides in Cancer and Normal Metabolism - Methods and Applications
Chromatographic Analysis of the Environment, Third Edition
Author: Leo M.L. Nollet
Publisher: CRC Press
ISBN: 1420027980
Category : Science
Languages : en
Pages : 1290
Book Description
Chromatographic Analysis of the Environment, Third Edition is a detailed handbook on different chromatographic analysis techniques and chromatographic data for compounds found in air, water, soil, and sludge. Taking on a new perspective from previous editions, this third edition discusses the parameters of each environmental compartment in a consistent format that highlights preparation techniques, chromatographic separation methods, and detection methods. Most of the data are compiled in tables and figures to elucidate the text as needed. Separate chapters approach specific aspects of sampling methods especially designed for environmental purposes, quantification of environmental analytes in difficult matrices, and data handling. The second part of the book focuses on the analysis of hazardous chemicals in the environment, including volatile organic carbons (VOCs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and endocrine-disrupting chemicals (EDCs). In addition, the authors feature information on compounds such as phosphates, organic acids, halogenated VOCs, amines, and n-ntirosamines, isocyanates, phthalate esters, and humic substances. Presenting important theoretical and practical aspects from sample collection to laboratory analysis, Chromatographic Analysis of the Environment, Third Edition is a unique resource of chromatographic techniques, data, and references that are useful to all scientists involved in the analysis of environmental compounds.
Publisher: CRC Press
ISBN: 1420027980
Category : Science
Languages : en
Pages : 1290
Book Description
Chromatographic Analysis of the Environment, Third Edition is a detailed handbook on different chromatographic analysis techniques and chromatographic data for compounds found in air, water, soil, and sludge. Taking on a new perspective from previous editions, this third edition discusses the parameters of each environmental compartment in a consistent format that highlights preparation techniques, chromatographic separation methods, and detection methods. Most of the data are compiled in tables and figures to elucidate the text as needed. Separate chapters approach specific aspects of sampling methods especially designed for environmental purposes, quantification of environmental analytes in difficult matrices, and data handling. The second part of the book focuses on the analysis of hazardous chemicals in the environment, including volatile organic carbons (VOCs), polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), and endocrine-disrupting chemicals (EDCs). In addition, the authors feature information on compounds such as phosphates, organic acids, halogenated VOCs, amines, and n-ntirosamines, isocyanates, phthalate esters, and humic substances. Presenting important theoretical and practical aspects from sample collection to laboratory analysis, Chromatographic Analysis of the Environment, Third Edition is a unique resource of chromatographic techniques, data, and references that are useful to all scientists involved in the analysis of environmental compounds.
Gas Chromatography
Author: Colin Poole
Publisher: Elsevier
ISBN: 0123855411
Category : Science
Languages : en
Pages : 753
Book Description
This title provides comprehensive coverage of modern gas chromatography including theory, instrumentation, columns, and applications addressing the needs of advanced students and professional scientists in industry and government laboratories. Chapters are written by recognized experts on each topic. Each chapter offers a complete picture with respect to its topic so researchers can move straight to the information they need without reading through a lot of background information. - Individual chapters written by recognized experts - The big picture of gas chromatography from theory, to methods, to selected applications - Provides references to other sources in associated areas of study to facilitate research - Gives access to core data for practical work, comparison of results and decision making
Publisher: Elsevier
ISBN: 0123855411
Category : Science
Languages : en
Pages : 753
Book Description
This title provides comprehensive coverage of modern gas chromatography including theory, instrumentation, columns, and applications addressing the needs of advanced students and professional scientists in industry and government laboratories. Chapters are written by recognized experts on each topic. Each chapter offers a complete picture with respect to its topic so researchers can move straight to the information they need without reading through a lot of background information. - Individual chapters written by recognized experts - The big picture of gas chromatography from theory, to methods, to selected applications - Provides references to other sources in associated areas of study to facilitate research - Gives access to core data for practical work, comparison of results and decision making
Principles and Practice of Modern Chromatographic Methods
Author: Kevin Robards
Publisher: Academic Press
ISBN: 012822097X
Category : Science
Languages : en
Pages : 532
Book Description
Principles and Practice of Modern Chromatographic Methods, Second Edition takes a comprehensive, unified approach in its presentation of chromatographic techniques. Like the first edition, the book provides a scientifically rigid, but easy-to-follow presentation of chromatography concepts that begins with the purpose and intent of chromatographic theory - the "what and why that are left out of other books attempting to cover these principles. This fully revised second edition brings the content up-to-date, covering recent developments in several new sections and an additional chapter on composite methods. New topics include sample profiling, sample preparation, sustainable green chemistry, 2D chromatography, miniaturization/nano-LC, HILIC, and more. - Contains thorough chapters that begin with an updated schematic overview and a visual representation of the content - Avoids the obfuscation of different terminologies and classification systems that are prevalent in the area, such as the relationship between liquid chromatography and column chromatography - Provides integrated and comprehensive topic coverage based on chromatographic bibliometrics and survey reports on the relative usage of chromatographic techniques
Publisher: Academic Press
ISBN: 012822097X
Category : Science
Languages : en
Pages : 532
Book Description
Principles and Practice of Modern Chromatographic Methods, Second Edition takes a comprehensive, unified approach in its presentation of chromatographic techniques. Like the first edition, the book provides a scientifically rigid, but easy-to-follow presentation of chromatography concepts that begins with the purpose and intent of chromatographic theory - the "what and why that are left out of other books attempting to cover these principles. This fully revised second edition brings the content up-to-date, covering recent developments in several new sections and an additional chapter on composite methods. New topics include sample profiling, sample preparation, sustainable green chemistry, 2D chromatography, miniaturization/nano-LC, HILIC, and more. - Contains thorough chapters that begin with an updated schematic overview and a visual representation of the content - Avoids the obfuscation of different terminologies and classification systems that are prevalent in the area, such as the relationship between liquid chromatography and column chromatography - Provides integrated and comprehensive topic coverage based on chromatographic bibliometrics and survey reports on the relative usage of chromatographic techniques
Practical Gas Chromatography
Author: Katja Dettmer-Wilde
Publisher: Springer
ISBN: 3642546404
Category : Science
Languages : en
Pages : 904
Book Description
Gas chromatography continues to be one of the most widely used analytical techniques, since its applications today expand into fields such as biomarker research or metabolomics. This new practical textbook enables the reader to make full use of gas chromatography. Essential fundamentals and their implications for the practical work at the instrument are provided, as well as details on the instrumentation such as inlet systems, columns and detectors. Specialized techniques from all aspects of GC are introduced ranging from sample preparation, solvent-free injection techniques, and pyrolysis GC, to separation including fast GC and comprehensive GCxGC and finally detection, such as GC-MS and element-specific detection. Various fields of application such as enantiomer, food, flavor and fragrance analysis, physicochemical measurements, forensic toxicology, and clinical analysis are discussed as well as cutting-edge application in metabolomics is covered.
Publisher: Springer
ISBN: 3642546404
Category : Science
Languages : en
Pages : 904
Book Description
Gas chromatography continues to be one of the most widely used analytical techniques, since its applications today expand into fields such as biomarker research or metabolomics. This new practical textbook enables the reader to make full use of gas chromatography. Essential fundamentals and their implications for the practical work at the instrument are provided, as well as details on the instrumentation such as inlet systems, columns and detectors. Specialized techniques from all aspects of GC are introduced ranging from sample preparation, solvent-free injection techniques, and pyrolysis GC, to separation including fast GC and comprehensive GCxGC and finally detection, such as GC-MS and element-specific detection. Various fields of application such as enantiomer, food, flavor and fragrance analysis, physicochemical measurements, forensic toxicology, and clinical analysis are discussed as well as cutting-edge application in metabolomics is covered.