Resultados de Pesquisa

INGLÊS

Carbohydrate Analysis - High Performance Liquid Chromatography And Capillary Electrophoresis

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Carbohydrates and glycoconjugates play an important role in several life processes. This book describes the specialized methods for their separation, purification and detection by HPLC and HPCE.
INGLÊS

Analytical Artifacts - Gc, Ms, Hplc, Tlc And Pc

de B.S. Middleditch

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This encyclopaedic catalogue of the pitfalls and problems that all analysts encounter in their work is destined to spend more time on the analyst's workbench than on a library shelf. The author has dedicated the book to ``the innumerable scientists who made mistakes, used impure chemicals and solvents, suffered the consequences of unanticipated side-reactions, and were otherwise exposed to mayhem yet were not too embarrassed to publish their findings''. Traditionally, the mass spectroscopist or gas chromatographer learnt his trade by participating in a 4-6 year apprenticeship as graduate student and post-doctoral researcher. Generally, no formal training was provided on the things that go wrong, but this information was accumulated by sharing in the experiences of colleagues. Nowadays, many novice scientists simply purchase a computerized instrument, plug it in, and use it. Much time can be wasted in studying and resolving problems due to artifacts and there is also a strong possibility that artifacts will not be recognized as such. For example, most analysts realize that they should use glass rather than plastic containers; but few of them would anticipate the possibility of plasticizer residues on glassware washed using detergent from a plastic bottle.This book is an easy-to-use compendium of problems encountered when using various commonly used analytical techniques. Emphasis is on impurities, by-products, contaminants and other artifacts. A separate entry is provided for each artifact. For specific chemicals, this entry provides the common name, mass spectrum, gas chromatographic data, CAS name and registry number, synonyms and a narrative discussion. More than 1100 entries are included. Mass spectral data are indexed in a 6-peak index (molecular ion, base peak, second peak, third peak) and there are also formula, author and subject indexes. An extensive bibliography contains complete literature citations.The book is designed to be used. It will not only allow experienced analysts to profit from the mistakes of others, but it will also be invaluable to other scientists who use analytical instruments in their work.
INGLÊS

Capillary Electrophoresis - Principles, Practice And Applications

de S.F.Y. Li

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Capillary Electrophoresis (CE) has had a very significant impact on the field of analytical chemistry in recent years as the technique is capable of very high resolution separations, requiring only small amounts of samples and reagents. Furthermore, it can be readily adapted to automatic sample handling and real time data processing. Many new methodologies based on CE have been reported. Rapid, reproducible separations of extremely small amounts of chemicals and biochemicals, including peptides, proteins, nucleotides, DNA, enantiomers, carbohydrates, vitamins, inorganic ions, pharmaceuticals and environmental pollutants have been demonstrated. A wide range of applications have been developed in greatly diverse fields, such as chemical, biotechnological, environmental and pharmaceutical analysis.This book covers all aspects of CE, from the principles and technical aspects to the most important applications. It is intended to meet the growing need for a thorough and balanced treatment of CE. The book will serve as a comprehensive reference work. Both the experienced analyst and the newcomer will find the text useful.
INGLÊS

Fundamentals And Techniques

231,88€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Fundamentals and Techniques
INGLÊS

Liquid Column Chromatography - A Survey Of Modern Techniques And Applications

251,75€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Liquid Column Chromatography
INGLÊS

Carbohydrate Analysis By Modern Chromatography And Electrophoresis

de Ziad El Rassi

490,25€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book is an updated and expanded edition of Carbohydrate Analysis, High Performance Liquid Chromatography and Capillary Electrophoresis and is concerned with the analysis of carbohydrates by modern chromatography and electrophoresis including analytical and preparative high performance liquid chromatography (HPLC), thin layer chromatography (TLC), field flow fractionation (FFF), capillary electrophoresis (CE), capillary electrochromatography (CEC), polyacrylamide gel electrophoresis (PAGE), gas chromatography (GC) and supercritical fluid chromatography (SFC). Thirty-one chapters cover: various modes of HPLC, CE, CEC, FFF, GC and SFC that are currently applied to the analysis of carbohydrates; discussions on analytical and preparative separations; descriptions of the principles of detection and quantitative determination of carbohydrates by the various separation techniques; reviews of sample preparations; and information on important applications. Furthermore, the book describes in detail the different direct and indirect detection methods that have been introduced for the sensitive detection of carbohydrates. This title is useful for a wide audience including separation scientists; analytical chemists and biochemists; carbohydrate chemists; glycoprotein and glycolipid chemists; molecular biologists; and biotechnologists. The book is also a useful reference for both the experienced analyst and the newcomer and for users of modern chromatography and electrophoresis.·Contains 31 chapters covering all aspects of carbohydrate analysis by modern chromatography and electrophoresis·Each chapter discusses the basic principles, advantages and limitations, and applications of the particular detection technique·Useful reference for both the experienced analyst and the newcomer
INGLÊS

Quantitative Column Liquid Chromatography - A Survey Of Chemometric Methods

de S.T. Balke

258,38€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Quantitative Column Liquid Chromatography
INGLÊS

Chromatography Of Antibiotics

245,13€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Chromatography of Antibiotics
INGLÊS

Applications

231,88€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Applications
INGLÊS

Chromatography Of Lipids In Biomedical Research And Clinical Diagnosis

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This multi-author volume provides an unprecedented in-depth coverage of the separation, identification and quantitation of simple and complex food and tissue fats and other lipids by chromatographic and mass spectrometric methods with emphasis on applications to biomedical research and clinical diagnosis. It contains a total of 13 chapters written by scientists who are internationally recognized in their specific fields. The volume covers analyses of molecular species of eicosanoids, sterols, and glycero and glycolipids in healthy and diseased human tissues and in appropriate animal models. The text complements the simpler group determinations of lipid classes commonly employed in clinical laboratories. The volume anticipates the discovery of the specific metabolism of molecular species of complex glycerolipids and provides the medical researcher and clinical investigator with the means for dealing with it.
INGLÊS

Chromatography Of Steroids

245,13€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Chromatography of Steroids
INGLÊS

Bioaffinity Chromatography

de J. Turkova

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Bioaffinity chromatography is now the preferred choice for the purification, determination or removal of many biologically active substances. The book includes information on biologically active substances with their affinants, solid supports and methods of coupling, summarized in tables covering classical, high-performance liquid and large-scale bioaffinity chromatography.Optimization of the preparation and the use of highly active and stable biospecific adsorbents is discussed in several chapters. Following a chapter dealing with the choice of affinity ligands, affinity-sorbent bonding is described in detail. Other chapters give information on solid supports, the most common coupling procedures and a general discussion of sorption and elution. Several applications of bioaffinity chromatography are described, e.g. quantitative evaluation of biospecific complexes and many applications in medicine and in the biotechnology industry.
INGLÊS

Liquid Chromatography In Biomedical Analysis

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book presents a guide for the analysis of biomedically important compounds using modern liquid chromatographic techniques. After a brief summary of basic liquid chromatographic methods and optimization strategies, the main part of the book focuses on the various classes of biomedically important compounds: amino acids, catecholamines, carbohydrates, fatty acids, nucleotides, porphyrins, prostaglandins and steroid hormones. The different chapters discuss specialized techniques pertaining to each class of compounds, such as sample pretreatment, pre- and post-column derivatization, detection and quantification.
INGLÊS

Stationary Phases In Gas Chromatography

de H. Rotzsche

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The primary aim of this volume is to make the chemist familiar with the numerous stationary phases and column types, with their advantages and disadvantages, to help in the selection of the most suitable phase for the type of analytes under study. The book also provides detailed information on the chemical structure, physico-chemical behaviour, experimental applicability, physical data of liquid and solid stationary phases and solid supports. Such data were previously scattered throughout the literature. To understand the processes occurring in the separation column and to offer a manual both to the beginner and to the experienced chromatographer, one chapter is devoted to the basic theoretical aspects. Further, as the effectiveness of the stationary phase can only be considered in relation to the column type, a chapter on different column types and the arrangement of the stationary phase within the column is included.The secondary aim of this book is to stimulate the development of new and improved standardized stationary phases and columns, in order to improve the reproducibility of separations, as well as the range of applications.
INGLÊS

Selective Gas Chromatographic Detectors

de M. Dressler

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book gives a comprehensive, up-to-date review of all selective detectors used in combination with gas chromatography. For each detector, the historical background, design and principle are described, and the working parameters affecting the detector performance are analyzed critically and in detail. The analytical possibilities of the detectors and the main characteristics such as sensitivity, noise and minimum detectability are discussed. All the selective detectors that are currently used are discussed in detail. Combinations of GC with other techniques such as plasma emission spectroscopy, atomic absorption spectrometry, ion-selective electrodes, piezoelectric sorption detector, mass spectrometry and infrared spectroscopy are discussed briefly.Chromatographers and users of gas chromatographs, especially in the field of environmental protection, agriculture, clinical chemistry, and toxicology will find the book useful to their work. Institutes and organisations dealing with analytical chemistry will also find it of interest.
INGLÊS

Chemical Methods In Gas Chromatography

de V.G. Berezkin

258,38€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Chemical Methods in Gas Chromatography
INGLÊS

Electron Capture - Theory And Practice In Chromatography

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Electron Capture
INGLÊS

Gas Chromatography In Air Pollution Analysis

de V.G. Berezkin e Yu.S. Drugov

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Air pollution determination is one of the most important fields of gas chromatography application in practice. This book provides a systematic description of the main stages of air pollution determination, ranging from sampling problems to the quantitative estimation of the acquired data. Special attention is paid to the problem of gas, vapor, spray and solid particles extraction from air. The main methods of sampling procedure, namely, container utilization, cryogenic concentration, absorption, adsorption, chemisorption and filter usage, and successive impurities extraction are also handled. Sorption theory and the problems of sorption and desorption efficiency for hazardous impurities being extracted from traps with sorbents are discussed in detail. The practical utilization of different sorbents (silica, activated carbon, polymers etc.) to carry out sampling procedures for 200 main pollutants with known TLV (USSR and USA) is also considered. This highly informative book, reflecting several insufficiently known techniques as well as the experience of both western and Soviet researchers, should be of interest to both beginners and skilled researchers.
INGLÊS

Quantitative Gas Chromatography For Laboratory Analyses And On-Line Process Control

de C.L. Guillemin e G. Guiochon

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 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.
INGLÊS

Instrumental Liquid Chromatography - A Practical Manual On High Performance Liquid Chromatographic Methods

245,13€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Instrumental Liquid Chromatography
INGLÊS

Advanced Chromatographic And Electromigration Methods In Biosciences

231,88€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book deals with chromatographic and electrophoretic methods applied for the separation (quantitation and identification) of biologically relevant compounds. It is assumed that the potential reader is familiar with the basics of chromatographic and electromigration methods. Individual separation modes are dealt with to an extent which follows their applicability for biomedical purposes: liquid chromatography and electromigration methods are therefore highlighted.Each chapter is completed with a list of recent literature covering the 1987-1997 period, which can be used for further guidance of the reader in his/her own field. The chapters have been written by specialists in a particular area and with an emphasis on applications to the biomedical field. This implies that theoretical and instrumental aspects are kept to a minimum which allows the reader to understand the text. Considerable attention is paid to method selection, detection and derivatization procedures and troubleshooting. The majority of examples given represent the analyses of typical naturally-occurring mixtures. Adequate attention is paid to the role of the biological matrix and sample pretreatment, and special attention is given to forensic, toxicological and clinical applications. The book is completed with an extensive Index of Compounds Separated.
INGLÊS

Retention And Selectivity In Liquid Chromatography - Prediction, Standardisation And Phase Comparisons

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book brings together a number of studies which examine the ways in which the retention and selectivity of separations in high-performance liquid chromatography are dependent on the chemical structure of the analytes and the properties of the stationary and mobile phases. Although previous authors have described the optimisation of separations by alteration of the mobile phase, little emphasis has previously been reported of the influence of the structure and properties of the analyte.The initial chapters describe methods based on retention index group increments and log P increments for the prediction of the retention of analytes and the ways in which these factors are influenced by mobile phases and intramolecular interactions. The values of a wide range of group increments in different eluents are tabulated.Different scales of retention indices in liquid chromatography are described for the comparison of separations, the identification of analytes and the comparison of stationary phases. Applications of these methods in the pharmaceutical, toxicology, forensic, metabolism, environmental, food and other fields are reviewed. The effects of different mobile phases on the selectivity of the retention indices are reported. A compilation of sources of reported retention index values are given.Methods for the comparison of stationary phases based on the interactions of different analytes are covered, including lipophilic and polar indices, shape selectivity comparisons, their application to novel stationary phases, and chemometric methods for column comparisons.
INGLÊS

Chromatography Of Mycotoxins - Techniques And Applications

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This work comprises two parts, Part A: Techniques and Part B: Applications. In Part A the most important principles of sample preparation, extraction, clean-up, and of established and prospective chromatographic techniques are discussed in relation to mycotoxins. In Part B the most important data, scattered in the literature, on thin-layer, liquid, and gas chromatography of mycotoxins have been compiled. Mycotoxins are mostly arranged according to families, such as aflatoxins, trichothecenes, lactones etc. Chromatography of individual important mycotoxins and multi-mycotoxin chromatographic analyses are also included. Applications are presented in three chapters devoted to thin-layer, liquid, and gas chromatography of mycotoxins.
INGLÊS

Natural Products Isolation - Separation Methods For Antimicrobials, Antivirals And Enzyme Inhibitors

58,29€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This new book encompasses, in great detail, the most recent progress made in the isolation and separation of natural products. It covers antibiotics, marine and plant-derived substances, enzyme inhibitors and interferons. The most recent separation methodology is described. Although there is a bias toward antibiotics, it was done because this is still the largest natural products area of research.The fourteen chapters are written by experts in their respective fields. The first two chapters are largely devoted to new methodology applied to purification of a variety of compounds. They include an extensive review and new applications of counter-current chromatography and the newly emerging HPLC-photodiode array technology. Chapter 3 provides a review of affinity chromatography applied to the separation of antibiotics for the first time. Next are chapters on antimicrobials with an update on all the most recent &bgr;-lactam (after 1976) discoveries. A comprehensive review of a very important class of antiparasitic agents - the avermectins - follows. An update of isolation and purification of a variety of marine-derived compounds is next. The succeeding chapter is a comprehensive review of the most recent developments in isolation and purification of interferons. This is followed by a discussion of enzyme inhibitors and their isolation and purification and ties in with a chapter on plant-derived natural products, some of which are also in this same category. The final chapter is a futuristic essay indicating the isolation of minute amounts of natural products and the fascinating biological properties which they possess.The book has extensive isolation schemes, tables, figures and chemical structures. In many instances a short summary of the producing organism, brief chemical description and structure and biological activity of the compounds is presented. Detailed information of extraction, separation and purification techniques follow. Each chapter has an extensive bibliography and, where applicable, an appendix showing sources of materials and equipment. A detailed index to the subject matter is included at the end of the book.The book thus offers the reader: up-to-date reviews (including 1988) of specific topics in the natural products field not to be found elsewhere; information on new chromatographic methods and techniques described in sufficient detail to be utilized by investigators in this area of research; and extensive references to enable the serious researcher to pursue particular information. It will appeal to pharmaceutical and natural products researchers and is a valuable acquisition for university chemistry and biochemistry departments.
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