Download or read book Analysis with Supercritical Fluids written by Bernd Wenclawiak and published by Springer. This book was released on 1992 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Capillary Gas Chromatography in Essential Oil Analysis written by Pat Sandra and published by . This book was released on 1987 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to essential oil analysis. some aspects of essential oil preparation. considerations on the selection of cappilary columns for essential oil analysis. microtechniques in essential oil analysis. headscape versus classical analysis. Fingerprints in essential oil analysis. industrial quality control of essential oil by capillary GC. Retention indices in essential oil analysis. Possibilities and results of dual channel analysis of essential oils with fused silica capillaru columns. GC- mass specytrometry of essential oils: positive ion and negative ion and negative ion chemical ionazation techniques,computer matching techniques. Examples of artefact formation by chromatographic techniques. Possibilities, limitations, and future develpments in GC-FTIR analysis of essential oils. Possibilities of multidimensional GC in essential oils.
Download or read book Analysis with Supercritical Fluids written by Bernd Wenclawiak and published by . This book was released on 1992-11-03 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The editor has brought together in a compact and readable form the new methods of analytical chemistry using supercritical fluids. The volume provides comprehensive treatment of supercritical fluid chromatography (SFC) and supercritical fluid extraction (SFE); it discusses both theory and practice. The contributions are written by leading experts in their fields with exhaustive practical experience in SFC and SFE. Special attention is given to the description of applications and thus provides the experienced analyst with invaluable information widely scattered in the literature and helps the novice to adopt these new techniques quickly in his laboratory. An addendum includes brand new literature on SFC and SFE.
Download or read book Characterization of Odorant Patterns by Comprehensive Two Dimensional Gas Chromatography written by and published by Elsevier. This book was released on 2022-02-16 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volume has as primary focus multidimensional gas chromatography (heart-cutting systems, comprehensive 2D-GC systems and hybrid solutions) and its characteristic features for in depth investigation of complex fractions of odor-active volatiles. Contributions, from outstanding researchers in the field from Academia and industry, cover fundamentals aspects on the physiology of olfaction, the strategies to identify key-odorants from the bulk of detectable volatiles (sensomics), the principles of operation of multidimensional analytical platforms (i.e., comprehensive two-dimensional gas chromatography – GC×GC; heart-cut 2D-GC, hybrid systems), and the fundamental role of mass spectrometry in providing reliable and informative data. Insights on new systems design and configurations are also provided, including sample preparation and data processing strategies, as important steps of the whole analytical process. Real-world examples cover food volatiles, complex aroma mixtures, odors emitted from industrial plants, volatiles of interest in forensic and medical applications. - Providing insights on fundamental aspects and advances in analytical platforms design and work-flows implementation for volatiles and odorants patterns detection in key-application areas - Up-dates on the most modern and advanced solutions to isolate, detect and characterize complex odorant patterns by multidimensional analytical techniques - Critical overview on main application areas where odors have a key-information role: food aroma and flavor industry, industrial environments, forensic and clinical applications
Download or read book Analysis of essential oils by combined liquid solid and gas liq written by Johannes Jacobus Christoffel Scheffer and published by . This book was released on 1978 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supercritical Fluids in Chromatography and Extraction written by R. M. Smith and published by Elsevier Science Limited. This book was released on 1997 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the mid 1980s supercritical fluid chromatography (SFC) arose with considerable fanfare as the new technique which would shortly "displace HPLC" and become the "universal separation method". After the initial hype had passed, there has still remained a significant group of applications in both chromatography and extraction for which supercritical fluids are the most suitable solvents. These form the basis of this volume, which illustrates the present state of analytical supercritical technology by a collection of review and research papers. Many publications in this field have blurred the boundaries of supercritical fluids, claiming that they filled a gap between gases and liquids and "had the properties of both". This was never true and this book seeks a more rational view of the state of application of supercritical fluids as their position in the analytical laboratory becomes clearer. These papers emphasise that future chromatographers should not be compartmentalised into "gas chromatographers" or "liquid chromatographers" but should view the field as a series of merging separation techniques. The overall emphasis is on extraction methods, usually as a sample preparation method prior to HPLC or GC analysis, but in some cases the extract is examined directly as the analytical step. This bias on extraction methods reflects the impact of supercritical fluids in the working laboratory. It is therefore an area where advances can have the maximum benefit for the user. The papers on chromatography are diverse and adventurous, covering particularly chiral chromatography and metal complex analysis, where SFC offers particular advantages over existing methods. Rather than be a separate branch of chromatography or extractions it is clear that the use of solvents above their normal conditions of temperature and pressure, up to and including the supercritical state, will continue to expand the range of analytical methods as part of an overall spectrum of solubility, polarity and volatility properties of solvents and mobile phases. This volume is an important addition to this movement and will help to redress the lack of education in the theory and practice of sample preparation which has been a great limiting factor for SFC and SFE.
Download or read book Qualitative Analysis of Flavor and Fragrance Volatiles by Glass Capillary Gas Chromatography written by Walter Jennings and published by Academic Press. This book was released on 1980-10-28 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Identification of Essential Oil Components by Gas Chromatography mass Spectroscopy written by Robert P. Adams and published by . This book was released on 1995 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt:
