Download or read book A Chromatographic and Spectroscopic Characterization of Chemically Bonded Stationary Phases written by Darrel R. Wilder and published by . This book was released on 1980 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Characterization of Well defined Chemically Bonded Stationary Phases for High Pressure Liquid Chromatography written by Gerrit Engbertus Berendsen and published by . This book was released on 1980 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and characterization of well defined chemically bonded stationary phase for high pressure liquid chromatography written by Gerrit Engbertus Berendsen and published by . This book was released on 1980 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book THE CHARACTERIZATION OF BONDED PHASES FOR HIGH PERFORMANCE LIQUID CHROMATOGRAPHY written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physical and chemical nature of chemically bonded phases used in high performance liquid chromatography have been studied. These bonded phases were characterized by a variety of chromotographic and non-chromatographic experiments. The non-chromatographic techniques included 13C NMR and batch extraction methods. The role played by the bonded phase as well as the mobile phase in determining the retention characteristics of the "stationary phase" were determined. The retention of solute molecules on bonded phases was found to be a function of the chain length of the bonded phase, the chemical nature of the bonded molecule, and the type of organic modifier used in the mobile phase. The energetics of the solute-stationary phase interactions was determined by the differential enthalpy and was found to be indicative of a partitioning process between two liquid phases. The retention process was also affected by the surface coverage of the bonded molecule. Optimum retention and separation characteristics were obtained with a hydrocarbon bonded phase of high surface coverage when used with a mobile phase containing a very polar organic modifier. The efficiency of these bonded phases was found to be independent of chain length as well as surface coverage of the bonded molecule. Some bonded phases which have specific functionalities incorporated into the bonded molecule are not true reversed phases. The selectivity of the bonded phases towards polar solute molecules was found to be affected by the type of organic modifier used in the mobile phase. The major accomplishment of this work shows that the stationary phase consists of the bonded molecule as well as trapped mobile phase. The composition of this ternary mixture is a function of the type and amount of bonded material and the type and amount of organic modifier used in the mobile phase

Download or read book Stationary Phases in Gas Chromatography written by H. Rotzsche and published by Elsevier. This book was released on 1991-08-21 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Chromatography and Separation Chemistry written by American Chemical Society. Meeting and published by . This book was released on 1986 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Highlights exciting developments in the science of chromatography and separations. Provides a unified theory to explain the manner of sorption in various forms of chromatography. Explores selectivity in reversed-phase HPLC, characterization of bonded-phases, relationship of column-packing structure and performance, variability of reversed-phase packing materials, and the differences between silica-based reversed-phase and poly(styrene-divinylbenzene) columns. Includes a special section on computerization in chromatography. Organic chemists, theorists, and bioscience researchers will find this work a stimulating, timely look at the science of chromatography.

Download or read book Bonded Stationary Phases in Chromatography written by Eli Grushka and published by . This book was released on 1974 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chromatographic and Spectroscopic Studies of Chemically reversible Bonded Phases and Mobile phase Additives for High Performance Liquid Chromatography written by Walter Bernard Hill and published by . This book was released on 1983 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Advances in Synthesis Characterization and Applications of Chemically Bonded Phases written by Mietek Jaroniec and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Chemically Bonded Stationary Phases for HPLC and Applications to the Analysis of Chlorinated Fulvic Acids written by Lawrence James Murphy and published by . This book was released on 1982 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1981 with total page 1370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book Characterization of Stationary Phases for Reversed phase Liquid Chromatography written by Hendrikus Antonius Claessens and published by . This book was released on 1999 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Synthesis and Characterization of Bonded Stationary Phases in High Performance Liquid Chromatography written by Steven Douglas Fazio and published by . This book was released on 1985 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chemically Bonded Stationary Phases for Gas Chromatography written by Janice Dikon Schlueter and published by . This book was released on 1976 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preparation and Characterization of Multifunctional Stationary Phases for Multimode Separations written by Asanka Wijekoon and published by . This book was released on 2010 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: High performance liquid chromatography is a powerful analytical technique employed to separate analyte mixtures. Since biomedical sample mixtures contain a very diverse range of compounds; one chromatographic mode is usually unable to separate all components of the mixture. Therefore, there is an increasing need for faster and efficient separations with a broad range of selectivity. To attain better selectivity and efficient separation, and to improve the versatility of the chromatographic column, a new way of preparation of multifunctional stationary phases, suitable for use in multiple chromatographic separation modes, is described. The preparation of multifunctional stationary phases takes advantage of Schiff base chemistry in two different synthetic routes. The first route involves reductive coupling of amino bonded silica with aldehyde containing ligands. The coupling of aldehyde bonded silica with amine containing ligands is the other reaction route. Aldehyde terminated silica is a versatile reactive platform that enables the synthesis of a wide range of stationary phases by attaching amine containing ligands that have diverse functionality. Here the preparation of aldehyde terminated silica was achieved by bonding aldehyde silane to the silica surface. Preparation of aldehyde silane is a novel approach and a successful synthetic scheme of making acetalated aromatic aldehyde silane (AAS- Aldehyde group in the silane has been protected by acetalation) and aromatic aldehyde silane (AS) is invented. The studies confirmed that the synthesized multifunctional chromatographic stationary phases were capable of operating in ion exchange mode, reversed phase mode and hydrophilic interaction liquid chromatographic mode. The studies further concluded that those surfaces have good selectivity for the separation of small polar and charge molecules. The application of the well established Schiff base reaction allowed the incorporation 2H to the bonded phases and is utilized to study the motional dynamics of the bonded ligands in the surface at different temperatures in the presence of a broad range of solvent systems by using 2H wide line NMR spectroscopy. The investigation provides information about the motional dynamic heterogeneity of the bonded ligands, which reflects the existence of surface heterogeneity of the surface.

Download or read book Journal of AOAC International written by and published by . This book was released on 1999 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Instrumental Thin Layer Chromatography written by Colin Poole and published by Elsevier. This book was released on 2023-01-14 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instrumental Thin-Layer Chromatography, Second Edition offers a comprehensive source of authoritative information on all aspects of instrumental thin-layer chromatography. The use of short, topic-focused chapters facilitates identifying information of immediate interest for familiar or emerging uses of thin-layer chromatography. The book gives those working in both academia and industry the opportunity to learn, refresh, or deepen their understanding of fundamental and instrumental aspects of thin-layer chromatography, as well as the tools to interpret and manage chromatographic data. The book serves as a practical consolidated guide to the selection of separation conditions and the use of auxiliary techniques. This fully updated new edition restores the contemporary character of the book for those involved in advancing the technology, analyzing data produced, or applying the technique to new application areas. Some chapters have been consolidated to make room for topics not covered in the first edition, reflecting general changes in the field of thin-layer chromatography, especially in effects-directed detection, convenient interfaces for advanced spectroscopic detection, and greater automation possibilities. This book is a valuable reference for anyone who needs to acquire fundamental and practical information to facilitate progress in research and management functions utilizing information acquired by thin-layer chromatography. Features individual chapters written by recognized authoritative and visionary experts in the field Provides an overview and focused treatment of a single topic Provides tables and diagrams with commonly used data to facilitate practical work, comparison of results, and decision-making Places modern developments in the research literature into a general context not always apparent to inexperienced users of the technique Offers comprehensive updates to all chapters Includes new chapters on instrument platforms, effects-directed detection, data analysis tools, small-scale and microfluidic planar separation systems, and applications to the separation of amino acids and peptides, the analysis of saccharides and lipids, and forensic analysis