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Author : Kaisa Syrjänen
Publisher :
ISBN 13 : 9789529127788
Total Pages : 64 pages
Book Rating : 4.1/5 (277 download)
Download or read book Oxidative Coupling of Phenols as a Model Reaction for Lignin Biosynthesis written by Kaisa Syrjänen and published by . This book was released on 2000 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harri Setälä
Publisher :
ISBN 13 : 9789513871109
Total Pages : pages
Book Rating : 4.8/5 (711 download)
Download or read book Regio- and Stereoselectivity of Oxidative Coupling Reaction of Phenols written by Harri Setälä and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Dimeric phenolic compounds -- lignans and dilignols -- form in the so-called oxidative coupling reaction of phenols. Enzymes such as peroxidases and laccases catalyze the reaction using hydrogen peroxide or oxygen, respectively, as oxidant generating phenoxy radicals which couple together according to certain rules. In this thesis, the effects of the structures of starting materials -- monolignols -- and the effects of reaction conditions such as pH and solvent system on this coupling mechanism and on its regio- and stereoselectivity have been studied. After the primary coupling of two phenoxy radicals a very reactive quinone methide intermediate is formed. This intermediate reacts quickly with a suitable nucleophile which can be, for example, an intramolecular hydroxyl group or another nucleophile such as water, methanol, or a phenolic compound in the reaction system. This reaction is catalyzed by acids. After the nucleophilic addition to the quinone methide, other hydrolytic reactions, rearrangements, and elimination reactions occur, leading finally to stable dimeric structures called lignans or dilignols. Similar reactions occur also in the so-called lignification process when monolignol (or dilignol) reacts with the growing lignin polymer. New kinds of structures have been observed in this thesis. The dimeric compounds with a so-called spirodienone structure have been observed to form both in the dehydrodimerization of methyl sinapate and in the [beta]-1-type crosscoupling reaction of two different monolignols. This [beta]-1-type dilignol with a spirodienone structure was the first synthesized and published dilignol model compound, and at present, it has been observed to exist as a fundamental construction unit in lignins. The enantioselectivity of the oxidative coupling reaction was also studied for obtaining enantiopure lignans and dilignols. A rather good enantioselectivity was obtained in the oxidative coupling reaction of two monolignols with chiral auxiliary substituents using peroxidase/H2O2 as an oxidation system. This observation was published as one of the first enantioselective oxidative coupling reaction of phenols. Pure enantiomers of lignans were also obtained by using chiral cryogenic chromatography as a chiral resolution technique. This technique was shown to be an alternative route to obtain enantiopure lignans or lignin model compounds in a preparative scale.
Author : William I. Taylor
Publisher :
ISBN 13 :
Total Pages : 416 pages
Book Rating : 4.:/5 (319 download)
Download or read book Oxidative Coupling of Phenols written by William I. Taylor and published by . This book was released on 1967 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Norman G. Lewis
Publisher :
ISBN 13 :
Total Pages : 456 pages
Book Rating : 4.3/5 (91 download)
Download or read book Lignin and Lignan Biosynthesis written by Norman G. Lewis and published by . This book was released on 1998 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides new information on the control of monolignal coupling and on modifying the biochemical steps in their formation and configuration. The text provides a critical assessment of recent advances in delineating the relationships and biosynthetic pathways of lignins and lignans. The discussion emphasizes lignin and lignan formation, particularly the templates for lignin assembly and the control of stereochemical coupling.
Author : Mervin Charles Hamblin
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (494 download)
Download or read book Oxidative Coupling of Phenols in Natural Product Biosynthesis written by Mervin Charles Hamblin and published by . This book was released on 1963 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Stéphane Quideau
Publisher :
ISBN 13 :
Total Pages : 606 pages
Book Rating : 4.:/5 (89 download)
Download or read book Incorporation of Para-hydroxycinnamic Acids Into Lignins Via Oxidative Coupling written by Stéphane Quideau and published by . This book was released on 1994 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gregg T. Beckham
Publisher : Royal Society of Chemistry
ISBN 13 : 1782625542
Total Pages : 544 pages
Book Rating : 4.7/5 (826 download)
Download or read book Lignin Valorization written by Gregg T. Beckham and published by Royal Society of Chemistry. This book was released on 2018-03-29 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Chapters will specifically focus on the production of fuels and chemicals from lignin."--Page [4] of cover.
Author : Francisco G. Calvo-Flores
Publisher : John Wiley & Sons
ISBN 13 : 1118682955
Total Pages : 512 pages
Book Rating : 4.1/5 (186 download)
Download or read book Lignin and Lignans as Renewable Raw Materials written by Francisco G. Calvo-Flores and published by John Wiley & Sons. This book was released on 2015-08-11 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: As naturally occurring and abundant sources of non-fossil carbon, lignin and lignans offer exciting possibilities as a source of commercially valuable products, moving away from petrochemical-based feedstocks in favour of renewable raw materials. Lignin can be used directly in fields such as agriculture, livestock, soil rehabilitation, bioremediation and the polymer industry, or it can be chemically modified for the fabrication of specialty and high-value chemicals such as resins, adhesives, fuels and greases. Lignin and Lignans as Renewable Raw Materials presents a multidisciplinary overview of the state-of-the-art and future prospects of lignin and lignans. The book discusses the origin, structure, function and applications of both types of compounds, describing the main resources and values of these products as carbon raw materials. Topics covered include: • Structure and physicochemical properties • Lignin detection methods • Biosynthesis of lignin • Isolation methods • Characterization and modification of lignins • Applications of modified and unmodified lignins • Lignans: structure, chemical and biological properties • Future perspectives This book is a comprehensive resource for researchers, scientists and engineers in academia and industry working on new possibilities for the application of renewable raw materials. For more information on the Wiley Series in Renewable Resources, visit www.wiley.com/go/rrs
Author : Fachuang Lu
Publisher :
ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.:/5 (89 download)
Download or read book Derivation Followed by Reductive Cleavage (The DFRC Method) written by Fachuang Lu and published by . This book was released on 1998 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cyril Heitner
Publisher : CRC Press
ISBN 13 : 142001580X
Total Pages : 686 pages
Book Rating : 4.4/5 (2 download)
Download or read book Lignin and Lignans written by Cyril Heitner and published by CRC Press. This book was released on 2016-04-19 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past four decades, there has been immense progress in every area of lignin science, ranging from the enzymology of lignin biodegradation, to the delignification of wood fiber during pulping and bleaching, to advances in spectroscopy. Lignin and Lignans: Advances in Chemistry captures the developments that have been achieved by world-class
Author : Wilfred Vermerris
Publisher : Springer Science & Business Media
ISBN 13 : 1402051646
Total Pages : 284 pages
Book Rating : 4.4/5 (2 download)
Download or read book Phenolic Compound Biochemistry written by Wilfred Vermerris and published by Springer Science & Business Media. This book was released on 2007-02-20 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: These are just a few examples that illustrate the chemical diversity and use of phenolic compounds, the topic of ‘Phenolic Compound Biochemistry’. This book is written for researchers, instructors, advanced undergraduate students and beginning graduate students in the life sciences who wish to become more familiar with these and many other intriguing aspects of phenolic compounds. Topics covered include nomenclature, chemical properties, biosynthesis, including an up-to-date overview of the genetics controlling phenolic metabolism, isolation and characterization of phenolic compounds, phenolics used in plant defense, and the impact of phenolics on human health. The book is written in an accessible style, and assumes only basic knowledge of organic chemistry, biochemistry and cell physiology. More than 300 chemical structures and reaction schemes illustrate the text. Wilfred Vermerris is Associate Professor of Agronomy at the University of Florida Genetics Institute in Gainesville, FL. His research focuses on the genetic control of phenolic compounds that impact agro-industrial processing of crop plants. Ralph Nicholson is Professor of Botany and Plant Pathology at Purdue University in West Lafayette, IN. He is an expert on phenolic compounds involved in the plant’s defense against pathogenic fungi and bacteria.
Author : Qingguo Huang
Publisher :
ISBN 13 :
Total Pages : 440 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Mechanistic Study of Peroxidase-catalyzed Phenol Coupling in Water/soil/sediment Systems written by Qingguo Huang and published by . This book was released on 2003 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (3 download)
Download or read book Research Summaries written by and published by . This book was released on 1992 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kishan Gopal Ramawat
Publisher : Springer
ISBN 13 : 9783642221439
Total Pages : 0 pages
Book Rating : 4.2/5 (214 download)
Download or read book Natural Products written by Kishan Gopal Ramawat and published by Springer. This book was released on 2013-06-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reference work provides a wealth of information regarding medicinal plants and phytochemicals. It is addressed both to researchers and teachers. The handbook describes phytochemicals, which, by the strictest definition, are chemicals that are produced by plants. During the last decades, more and more groups became actively involved in exploring plants for useful metabolites that lead to the identification of several useful curative agents and many promising molecules to fight and/or prevent diseases, including carcinogenesis and stroke. But when we talk about phytochemicals, there are also medicinal plants where not a single molecule is responsible for the observed properties. This reference work therefore reviews and compiles the information on both these aspects. The volumes contain contributions on phytochemicals and herbal extracts. A large number of natural products obtained from plants and microorganisms is used in cosmetic, drug, flavor and fragrance industries. For this compilation, a range of the most important medicinal herbs and phytochemicals were selected and are described by the recognized authors in the field. The present reference work encompasses the information about well established phytochemicals, biology and biotechnology of medicinal plants or their products, their biosynthesis, novel production strategies, demand and uses, metabolism and bioavailability. There is a surge of information published in recent years on herbal medicine and their pharmacologic effects with single books available on varied subjects. However, all this information is widespread and difficult to overview. Researchers who wish to keep a pace with the rapidly developing field of natural products can now consult this newly compiled handbook to find all information about bioactive molecules and medicinal plants thoroughly compiled in one place!
Author : Stephen Y. Lin
Publisher : Springer Science & Business Media
ISBN 13 : 3642740650
Total Pages : 595 pages
Book Rating : 4.6/5 (427 download)
Download or read book Methods in Lignin Chemistry written by Stephen Y. Lin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date compilation of the theoretical background and practical procedures involved in lignin characterization. Whenever possible, the procedures are presented in sufficient detail to enable the reader to perform the analysis solely by following the step-by-step description. The advantages and limitations of individual methods are discussed and, more importantly, illustrated by typical analytical data in comparison to results obtained from other methods. This handbook serves the need of researchers and other professionals in academia, the pulp and paper industry as well as allied industries. It is equally useful for those with no previous experience in lignin or lignocellulosics.
Author : Tomoko Matsuda
Publisher : Elsevier
ISBN 13 : 0444637508
Total Pages : 464 pages
Book Rating : 4.4/5 (446 download)
Download or read book Future Directions in Biocatalysis written by Tomoko Matsuda and published by Elsevier. This book was released on 2017-08-11 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future Directions in Biocatalysis, Second Edition, presents the future direction and latest research on how to utilize enzymes, i.e., natural catalysts, to make medicines and other necessities for humans. It emphasizes the most important and unique research on biocatalysis instead of simply detailing the ABC's on the topic. This book is an indispensable tool for new researchers in the field to help identify specific needs, start new projects that address current environmental concerns, and develop techniques based on green technology. It provides invaluable hints and clues for conducting new research on enzymes, with final sections outlining future directions in biocatalysis further expanding the science into new applications. - Gives future directions in the area of biocatalysis research - Presents research topics based on their uniqueness, originality, and novelty - Includes many explanatory figures to demonstrate concepts to both organic chemists and biochemists - Shows that there is no boundary between organic chemistry and biochemistry
Author : Giuseppe Cirillo
Publisher : John Wiley & Sons
ISBN 13 : 1118445511
Total Pages : 601 pages
Book Rating : 4.1/5 (184 download)
Download or read book Antioxidant Polymers written by Giuseppe Cirillo and published by John Wiley & Sons. This book was released on 2012-06-07 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antioxidant Polymers is an exhaustive overview of the recent developments in the field of polymeric materials showing antioxidant properties. This research area has grown rapidly in the last decade because antioxidant polymers have wide industry applications ranging from materials science to biomedical, pharmaceuticals and cosmetics.
