Cholesterol Autoxidation

Download or read book Cholesterol Autoxidation written by Leland L. Smith and published by Springer Science & Business Media. This book was released on 2013-11-22 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most components of the biosphere are continuously ex posed to oxygen from the atmosphere. Accordingly, the inex orable deterioration of all organic compounds by the slow attack of oxygen must occur. Despite this eventuality, a definitive treatment of oxygen-dependent decomposition of any single important natural product has not heretofore been made. The instant monograph attempts to provide a complete description of the autoxidation of one such impor tantnatural product, cholesterol, as the matter is currently understood. The autoxidation of cholesterol in Nature has been a matter of interest to others since the close of the nine teenth century and to me for the past three decades. In this monograph I present aspects of what I have learned about cholesterol autoxidation during that interval. Be cause of the diffuse ann troublesoae nature of the subject I have selected to cite references to the literature rather fully, so that all items discussed may be properly evaluated by the interested reader. Though such extensive citation of references makes for labored reading, I hope the text will serve as a definitive treatment of the subject from which other studies may be engendered without extensive recourse to the older material. An .attempt has been made to include much related in formation so that a detailed awareness of the interrelation ships between cholesterol autoxidation and other aspects of chemistry, metabolism, and toxicology may be had. I risk teaching more on the subject than any reader care to learn.

Download or read book Autoxidation in Food and Biological Systems written by M.G. Simic and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: The material presented in this book deals with basic mechanisms of free radical reactions in autoxidation processes and anitoxidant suppression of autoxidation of foods, biochemical models and biologi cal systems. Autoxidation in foods and corresponding biological effects are usually approached separately although recent mechanistic developments in the biochemistry and free radical chemistry of per oxides and their precursors tend to bring these two fields closer. Apparent ability of antioxidants in diets to reduce the inci dence of cancer has resulted in scrutiny of autoxidized products and their precursors as possibly toxic, mutagenic and carcinogenic agents. Mechanisms of any of these effects have been barely ad dressed. Yet we know now that free radicals, as esoteric as they were only a few decades ago, are being discovered in foods, biochem ical and biological systems and do play a role in the above-mentioned causalities. The purpose of the Workshop and the resulting book was to give a unifying approach towards study of beneficial and deleterious effects of autoxidation, based on rigorous scientific considerations. It is our hope that the material presented in this book will not only provide a review of the "state of the art" of autoxidation and anti oxidants, but also reflect the interaction which occurred during the Workshop between workers using model sytems, and food and biological systems.

Download or read book Measuring Oxidants and Oxidative Stress in Biological Systems written by Lawrence J. Berliner and published by Springer Nature. This book was released on 2020-08-08 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the methods of analysis and determination of oxidants and oxidative stress in biological systems. Reviews and protocols on select methods of analysis of ROS, RNS, oxygen, redox status, and oxidative stress in biological systems are described in detail. It is an essential resource for both novices and experts in the field of oxidant and oxidative stress biology.

Download or read book Lipid Chromatographic Analysis written by Takayuki Shibamoto and published by CRC Press. This book was released on 1993-12-14 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on state-of-the-art gas chromatography (GC) and high-performance liquid chromatography, this guide discusses the theories behind, and applications of, the latest developments in chromatographic techniques - assessing the strengths and limitations of each methodology.;Presenting many detection methods for the first time, Lipid Chromatographic Analysis: provides a review of conventional column and thin-layer chromatography; examines a new GC technique to detect plasmalogen phospholipids; outlines a supercritical fluid chromatography for lipids; details the first systematic description of a microanalytical procedure for cholesterol and related compounds; explains a GC analysis of lipid breakdown products for monitoring biological processes such as ageing, carcinogenesis and mutagenesis; and describes techniques that allow for the simultaneous analysis of non-polar and polar lipids.

Download or read book Lipid Oxidation written by Edwin N. Frankel and published by Elsevier. This book was released on 2014-01-23 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this second edition, Edwin Frankel has updated and extended his now well-known book Lipid oxidation which has come to be regarded as the standard work on the subject since the publication of the first edition seven years previously. His main objective is to develop the background necessary for a better understanding of what factors should be considered, and what methods and lipid systems should be employed, to achieve suitable evaluation and control of lipid oxidation in complex foods and biological systems. The oxidation of unsaturated fatty acids is one of the most fundamental reactions in lipid chemistry. When unsaturated lipids are exposed to air, the complex, volatile oxidation compounds that are formed cause rancidity. This decreases the quality of foods that contain natural lipid components as well as foods in which oils are used as ingredients. Furthermore, products of lipid oxidation have been implicated in many vital biological reactions, and evidence has accumulated to show that free radicals and reactive oxygen species participate in tissue injuries and in degenerative disease. Although there have been many significant advances in this challenging field, many important problems remain unsolved. This second edition of Lipid oxidation follows the example of the first edition in offering a summary of the many unsolved problems that need further research. The need to understand lipid oxidation is greater than ever with the increased interest in long-chain polyunsaturated fatty acids, the reformulation of oils to avoid hydrogenation and trans fatty acids, and the enormous attention given to natural phenolic antioxidants, including flavonoids and other phytochemicals.

Download or read book Biological Effects of Cholesterol Oxides written by Shi-Kaung Peng and published by CRC Press. This book was released on 1991-11-22 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, researchers have accumulated a growing body of evidence linking cholesterol oxides with human diseases such as atherosclerosis and cancer. This book presents what is presently known about the biological activities of cholesterol oxides and is intended to stimulate thinking in new areas of diet-heart or diet-cancer research. Topics discussed include the oxidation of cholesterol, methods of analysis of cholesterol oxides, cholesterol oxide content in foods, effects of cholesterol oxides on cell membranes, and cytotoxicity of cholesterol oxides. The book will be an essential reference source for researchers working directly with cholesterol and cholesterol oxides, as well as researchers concerned with the wider aspects of chemistry, biology, and medicine.

Download or read book Cholesterol and Phytosterol Oxidation Products written by Francesc Guardiola and published by The American Oil Chemists Society. This book was released on 2002-07-30 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprehensively reviews several aspects of cholesterol oxidation products: cholesterol oxidation mechanisms, analytical determination, origin and content of these compounds in foods and biological samples, and their biological effects, with an emphasis on recent advances in these fields. Information on different aspects of phytosterol oxidation is reviewed. Little research has been conducted on the analysis of mixed sterol oxidation products. Mixed diets containing both cholesterol and phytosterols can contain a complex array of oxidation products generated from these sterols. Research into the problem of analyzing these complex mixtures of compounds is highlighted.