By Stephane Quideau
This booklet is the 1st of its sort that makes a speciality of the chemistry and biology of ellagitannins, a distinct category of clearly happening polyphenols which have thus far now not obtained the eye they deserve. those polyphenolic ingredients are present in many crops, together with a number of nutrients assets. They no longer basically show certain structural good points that fascinate so much chemists who're conscious of their lifestyles, but additionally exhibit striking organic actions that experience but to draw the curiosity of the pharmaceutical undefined. this can be incredible simply because ellagitannins were pointed out as energetic ideas in conventional chinese language medications.
The significant objective of this e-book is to set the list directly. such a lot, if no longer all, world wide specialists in every one element of the chemistry and biology of this underestimated classification of average items have contributed to this e-book. It covers themes similar to their structural decision and typical prevalence; the main up to date wisdom in their biosynthesis; the present country of the artwork in their overall chemical synthesis; their major physicochemical homes and primary organic actions; their presence in nutrients and drinks; and their comparable healthiness results. All jointly, 9 chapters compose this e-book whose content material is positioned into historic point of view in a but inspiring preface written by means of one of many pioneers in sleek polyphenol learn, Professor Edwin Haslam. This publication can be worthy not just to scientists excited by usual product examine, but additionally to teachers and their scholars as a resource of key references and/or a textbook.
Contents: Ellagitannins Renewed the idea that of Tannins; Structural variety and Antimicrobial actions of Ellagitannins; Biosynthesis of Ellagitannins: previous principles and New strategies; Physicochemical houses and Biomimetic Reactions of Ellagitannins; innovations for the Synthesis of Ellagitannins; Immunomodulatory Ellagitannin Chemistry; Bioavailability and Metabolism of Ellagic Acid and Ellagitannins; resources and healthiness results of nutritional Ellagitannins; C-Glycosidic Ellagitannins and Their effect on Wine Chemistry.
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Additional info for Chemistry and Biology of Ellagitannins: An Underestimated Class of Bioactive Plant Polyphenois
O O O O O HO OH HO OH Galloyl HO OH OH HO O OH HO HHDP HO OH O OH OH DHHDP O O HOOC HO Transformed DHHDP OH O OH O Fig. 1 Oxidative transformations from the galloyl and HHDP groups. Further oxidative transformations of the DHHDP group yield several other subclasses of ellagitannins, some members of which are shown in the following part of this chapter and in Chapter 2. 2 Regiospecificity of the HHDP group on the glucose core, and its correlation to plant families The positioning of the HHDP group or its oxidized variants on the glucose core is generally the same in ellagitannins produced by plant species of the same family.
4). The transformation of camelliatannin A into cammelliatannin F, featuring a cyclopentenone ring, was achieved by heating camelliatannin A in a mixture of ethanol and acetic acid (Fig. , 1995). , 1982b). , 1992b, 1999, 2005). Such oligomers often express specific pharmacological activities (vide infra) that are not shared by monomeric ellagitannins and other tannins. HO HO OH HO Liquidambin O O O HO HO O O HO HO O OH O HO O O O HO HO O HO O OH OH OH HO HO HO OH H O HO OH OH H O O O HO O O OH HO O O OH + Casuariin HO OH OH HO OH OH OH (-)-Epicatechin HO HO OH OH HO HO HO O O O HO O O OH H OH O HO OH O O HO OH HO OH OH OH OH OH HO O HO HO HO HO HO OH O O O O O H OH O OH Camelliatannin B O O OH O Camelliatannin A HO HO OH OH HO OH Fig.
1998, 2002). , 2002). 1 Classification of hydrolyzable tannins based on the oxidation stages of their polyphenolic functions Hydrolyzable tannins of various biogenetic oxidative stages can be classified into types I to IV according to the degree of oxidation of their polyphenolic groups. , camelliatannin F. 2 Correlation of the oxidation stages with Cronquist’s system of plant evolution The progressive oxidative transformations of monomeric ellagitannins can be correlated with morphological plant evolution system.
Chemistry and Biology of Ellagitannins: An Underestimated Class of Bioactive Plant Polyphenois by Stephane Quideau