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Author : Reiner Wittkowski
Publisher : Unknown
Page : 379 pages
File Size : 52,5 Mb
Release : 1992
Category : Food
ISBN : 3860220373
Author : R. Wittkowski
Publisher : CRC Press
Page : 380 pages
File Size : 52,7 Mb
Release : 2020-12-17
Category : Science
ISBN : 9781000125139
This book offers a comprehensive survey on the possibilities, applications, and new developments of capillary gas chromatography for the complete range of examinations of food and raw material. It is intended for food scientists/chemists, food technologists, and nutritionists.
Author : R. Wittkowski
Publisher : CRC Press
Page : 300 pages
File Size : 41,9 Mb
Release : 1993-05-06
Category : Technology & Engineering
ISBN : 1566760062
Author : R. Wittkowski
Publisher : CRC Press
Page : 418 pages
File Size : 52,7 Mb
Release : 2020-12-18
Category : Science
ISBN : 9781000159950
This book offers a comprehensive survey on the possibilities, applications, and new developments of capillary gas chromatography for the complete range of examinations of food and raw material. It is intended for food scientists/chemists, food technologists, and nutritionists.
Author : Michael H. Gordon
Publisher : Springer Science & Business Media
Page : 371 pages
File Size : 41,5 Mb
Release : 2013-03-08
Category : Science
ISBN : 9781461306818
The food analyst plays an important role in modern society. Stricter control over additives in food and concern about the effects of contamination of food by industrial and agricultural chemicals are among the developments which are leading to an increasing emphasis on detailed and accurate analysis of food. However. analysis of food is required for many reasons, including detection of toxic components, monitoring legislation, detecting adulteration, formulation of controlled diets, controlling formulation during product development and detecting changes in food during storage and processing. Foods comprise a complex mixture of components and food analysis requires efficient methods of separation with high sensitivity or specificity of detection. Although many food components are involatile or thermally labile and therefore not suitable for analysis by gas chromatography, other components are volatile and this technique is the preferred analytical method. Developments in methods of derivati zation, injector design and column technology have also extended the applicability of gas chromatography to the analysis of relatively involatile compounds.
Author : Lothar Matter
Publisher : John Wiley & Sons
Page : 190 pages
File Size : 50,5 Mb
Release : 2008-09-26
Category : Science
ISBN : 9783527612543
Author : Peter Q Tranchida
Publisher : Royal Society of Chemistry
Page : 492 pages
File Size : 44,9 Mb
Release : 2019-10-30
Category : Science
ISBN : 9781788011273
Gas chromatography is widely used in applications involving food analysis. Typical applications pertain to the quantitative and/or qualitative analysis of food composition, natural products, food additives, and flavour and aroma components. Providing an up-to-date look at the significant advances in the technology, this book includes details on novel sample preparation processes; conventional, high-speed multidimensional gas chromatography systems, including preparative instrumentation; gas chromatography–olfactometry principles; and, finally, chemometrics principles and applications in food analysis. Aimed at providing the food researcher or analyst with detailed analytical information related to advanced gas chromatography technologies, this book is suitable for professionals and postgraduate students learning about the technique in the food industry and research.
Author : S. E. Fayle,Juliet A. Gerrard
Publisher : Royal Society of Chemistry
Page : 144 pages
File Size : 46,8 Mb
Release : 2002
Category : Science
ISBN : 0854045813
It is almost 100 years since the Maillard reaction was first described. Despite decades of research since then, the products of the reaction and the mechanistic pathways leading to their formation are only gradually being unravelled. Combining comprehensive information regarding the various methods that can be employed in the analysis of Maillard products with a discussion of the advantages and limitations of those methods, this unique book provides a 'one-stop' text from which methods of analysis may be obtained. It will be useful for both new and experienced researchers who are involved in solving the mysteries and complexities of Maillard chemistry.
Author : Walter Jennings
Publisher : Elsevier
Page : 481 pages
File Size : 51,5 Mb
Release : 2012-12-02
Category : Technology & Engineering
ISBN : 9780323141055
Qualitative Analysis of Flavor and Fragrance Volatiles by Glass Capillary Gas Chromatography deals with the application of glass capillary gas chromatography to qualitative analysis of flavor and fragrance volatiles. Topics range from gas chromatographic system requirements and retention indices to selective detectors, ancillary reactions, and gas chromatography-mass spectrometry. This text is comprised of six chapters; the first of which provides an overview of the use of glass capillary gas chromatography in qualitative analysis of flavor and fragrance volatiles. The discussion then turns to gas chromatographic system requirements with respect to columns, inlets, detectors, and temperature control. The reader is also introduced to the Kovats retention index system, which utilizes a logarithmic scale to describe the retention behavior of a compound relative to that of the n-paraffin hydrocarbons. The use of selective detectors, such as thermal conductivity, flame ionization, nitrogen-phosphorus, electron capture, and photoionization detectors in qualitative analysis, is also considered. The final two chapters focus on ancillary reactions in glass capillary gas chromatography and general considerations in gas chromatography-mass spectrometry, including interfacing. This book is intended primarily for researchers involved in studies of the volatile constituents of fragrances, food, and natural products.
Author : Walter Jennings,Eric Mittlefehldt,Phillip Stremple
Publisher : Academic Press
Page : 402 pages
File Size : 41,8 Mb
Release : 1997-09-25
Category : Science
ISBN : 9780080527208
Gas chromatography remains the world's most widely used analytical technique, yet the expertise of a large proportion of chromatographers lies in other fields. Many users have little real knowledge of the variablesin the chromatographic process, the interaction between those variables, how they are best controlled, how the quality of their analytical results could be improved, and how analysis times can be shortened to facilitate the generation of a greater numberof more reliable results on the same equipment. An analyst with a more comprehensive understanding of chromatographic principles and practice, however, can often improve the quality of the data generated, reduce the analytical time, and forestall the needto purchase an additional chromatograph or another mass spectrometer. The Second Edition of Analytical Gas Chromatography is extensively revised with selected areas expanded and many new explanations and figures. The section on sample injection has been updated to include newer concepts of split, splitless, hot and cold on-column, programmed temperature vaporization, and large volume injections. Coverage of stationary phases now includes discussion, applications, and rationale of the increased thermal and oxidative resistance of the newly designed silarylenepolysiloxane polymers. Conventional and"extended range"polyethylene glycol stationary phases are examined from the viewpoints of temperature range and retention index reliabilities, and the chapter on"Variables"has been completely rewritten. The ways in which carrier gas velocity influences chromatographic performance is considered in detail, and includes what may be the first rational explanation of the seemingly anomalous effects that temperature exercises on gas viscosity (and gas flow). The practical effects that these changes cause to the chromatography is examined in pressure-, flow-, and"EPC-"regulated systems."Column Selection, Installation, and Use"has been completely rewritten as well. The accuracy of theVan Deemter plots has been greatly enhanced; a new program corrects for the first time for the changes in gas density and diffusion that occur during the chromatographic process because of solute progression through the pressure drop of the column. A new section has also been added on meeting thespecial requirements of columns destined for mass spectral analysis. The chapter on"Special Applications"has been expanded to include considerations of"selectivity tuning,"of fast analysis, and the section of Applications has been thoroughly updated and expanded. Incorporates nearly 60% new material Covers the newest concepts and materials for sample injection and stationary phases Presents detailed consideration of the influence of carrier gas velocity on practical aspects of chromatographic performance Contains a chapter on "Special Analytical Techniques" which includes consideration of selectivity tuning and fast analysis Provides a new section addressing the special requirements of columns to be used in mass spectral analysis Includes an improved program that greatly enhances the accuracy of the Van Deemter plots by more accurately depicting localized chromatographic conditions at each point in the column
Author : Erich Ziegler,Herta Ziegler
Publisher : John Wiley & Sons
Page : 726 pages
File Size : 45,8 Mb
Release : 2008-07-11
Category : Science
ISBN : 9783527611812
The demand for flavourings has been constantly increasing over the last years as a result of the dramatic changes caused by a more and more industrialised life-style: The consumer is drawn to interesting, healthy, pleasurable, exciting or completely new taste experiences. This book draws on the expert knowledge of nearly 40 contributors with backgrounds in both industry and academia and provides a comprehensive insight into the production, processing and application of various food flavourings. Established flavours produced commercially are summarized on a large scale. Methods of quality control and quality management are discussed in detail. The authors also focus on conventional and innovative analytical methods employed in this field and, last but not least, on toxicological, legal, and ethical aspects. Up-to-date references to pertinent literature and an in-depth subject index complete the book.
Author : Andrea Büttner
Publisher : Springer
Page : 1151 pages
File Size : 47,5 Mb
Release : 2017-02-28
Category : Technology & Engineering
ISBN : 9783319269320
The Springer Handbook of Odor is the definitive guide to all aspects related to the study of smell and their impact on human life. For the first time, this handbook aligns the senso-chemo-analytical characterization of everyday smells encountered by mankind, with the elucidation of perceptual, hedonic, behavioral and physiological responses of humans to such odors. From birth onwards we learn to interact with our environment using our sense of smell. Moreover, evolutionary processes have engendered a multi-faceted communication that is supported – even dominated – by olfaction. This compilation examines the responses of humans to odors at different stages of life, thereby building a foundation for a widely overseen area of research with broader ramifications for human life. The expert international authors and editor align aspects, concepts, methodologies and perspectives from a broad range of different disciplines related to the science of smell. These include chemistry, physiology, psychology, material sciences, technology but also disciplines related to linguistics, culture, art and design. This handbook, edited by an internationally renowned aroma scientist with the support of an outstanding team of over 60 authors, is an authoritative reference for researchers in the field of odors both in academia and in industry and is also a useful reference for newcomers to the area.
Author : Eugene F. Barry,Robert L. Grob, PhD
Publisher : John Wiley & Sons
Page : 315 pages
File Size : 41,7 Mb
Release : 2007-04-27
Category : Science
ISBN : 9780470114179
Choosing the right column is key in Gas Chromatography Gas Chromatography (GC) is the most widely used method for separating and analyzing a wide variety of organic compounds and gases. There have been many recent advancements in both packed column and capillary column GC. With numerous options and considerations, selecting the right column can be complicated. This resource provides essential guidance for scientists and technicians, including: Methods of choosing both capillary and packed columns Selection of dimensions (column length, I.D., film thickness, etc.) and type of column Guidelines for proper connections of the column to the injector and detector United States Pharmacopeia and National Formulary chromatographic methods ASTM, EPA, NIOSH, and OSHA column selection specifications Information on the advantages of computer assistance in GC and multidimensional GC Comprehensive information on column oven temperature control Columns for Gas Chromatography: Performance and Selection is a hands-on reference for scientists and technicians using GC.
Author : Anonim
Publisher : Elsevier
Page : 7944 pages
File Size : 55,5 Mb
Release : 2010-03-05
Category : Science
ISBN : 9780080453828
This work presents a definitive interpretation of the current status of and future trends in natural products—a dynamic field at the intersection of chemistry and biology concerned with isolation, identification, structure elucidation, and chemical characteristics of naturally occurring compounds such as pheromones, carbohydrates, nucleic acids, and enzymes. With more than 1,800 color figures, Comprehensive Natural Products II features 100% new material and complements rather than replaces the original work (©1999). Reviews the accumulated efforts of chemical and biological research to understand living organisms and their distinctive effects on health and medicine Stimulates new ideas among the established natural products research community—which includes chemists, biochemists, biologists, botanists, and pharmacologists Informs and inspires students and newcomers to the field with accessible content in a range of delivery formats Includes 100% new content, with more than 6,000 figures (1/3 of these in color) and 40,000 references to the primary literature, for a thorough examination of the field Highlights new research and innovations concerning living organisms and their distinctive role in our understanding and improvement of human health, genomics, ecology/environment, and more Adds to the rich body of work that is the first edition, which will be available for the first time in a convenient online format giving researchers complete access to authoritative Natural Products content
Author : Peter Q. Tranchida,Luigi Mondello
Publisher : Elsevier
Page : 516 pages
File Size : 47,8 Mb
Release : 2019-11-29
Category : Science
ISBN : 9780128096390
Hyphenations of Capillary Chromatography with Mass Spectrometry provides comprehensive coverage of capillary chromatography with mass spectrometry—both single and multidimensional approaches. The book examines nearly all capillary chromatography approaches, combined with a variety of MS forms, giving readers a wide and detailed view on current-day analytical strategies and applications. Of particular focus are novel developments in the field of MS, such as the Orbitrap, HR ToF, ToF MS with variable electron-impact energy, fast MS-MS and APGC technology. Junior scientists conducting research on mono-dimensional chromatography-MS fundamental relationships and experienced analytical chemists working in conventional capillary chromatography and classical multidimensional chromatography will find this an ideal application-based reference on the hyphenations of these domains. Combines mass spectrometry with a range of chromatographic approaches Emphasizes the importance of both capillary chromatography and mass spectrometry methods, thus stimulating separation scientists to fully exploit both analytical dimensions Authored by two of the world’s leading analytical chemists who have a total of more than 40 years of experience in research and instruction
