Chemistry and Biology of Ellagitannins: An Underestimated by Stephane Quideau

By Stephane Quideau

This booklet is the 1st of its variety that specializes in the chemistry and biology of ellagitannins, a distinct type of clearly taking place polyphenols which have up to now now not got the eye they deserve. those polyphenolic elements are present in many vegetation, together with various foodstuff assets. They now not merely express distinct structural positive factors that fascinate so much chemists who're conscious of their life, but in addition convey amazing organic actions that experience but to draw the curiosity of the pharmaceutical undefined. this can be staggering simply because ellagitannins were pointed out as energetic ideas in conventional chinese language drugs.

The imperative goal of this publication is to set the list directly. such a lot, if now not all, around the world specialists in every one point of the chemistry and biology of this underestimated type of usual items have contributed to this publication. It covers issues corresponding to their structural decision and normal prevalence; the main updated wisdom in their biosynthesis; the present nation of the paintings in their overall chemical synthesis; their major physicochemical houses and relevant organic actions; their presence in foodstuff and drinks; and their comparable future health results. All jointly, 9 chapters compose this booklet whose content material is positioned into ancient viewpoint in a but inspiring preface written by means of one of many pioneers in sleek polyphenol study, Professor Edwin Haslam. This ebook should be necessary not just to scientists thinking about ordinary 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 suggestions; Physicochemical houses and Biomimetic Reactions of Ellagitannins; recommendations for the Synthesis of Ellagitannins; Immunomodulatory Ellagitannin Chemistry; Bioavailability and Metabolism of Ellagic Acid and Ellagitannins; resources and overall healthiness results of nutritional Ellagitannins; C-Glycosidic Ellagitannins and Their impression on Wine Chemistry.

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1 Isomerization of dimers via Smiles rearrangement Hirtellin C is a macrocyclic dimer possessing both the m- and p-GOG units that was isolated from Reaumuria hirtella (Tamaricaceae). It is readily isomerized into isohirtellin C in hot water at 95 °C via a Smiles rearrangement that enables the conversion of the p-GOG unit into a mGOG unit. This rearrangement is presumably facilitated by the release of steric effects originating from hydroxyl groups in the p-GOG linking unit. , 1993a). Application of this isomerization reaction was used to confirm the structure of tamarixinins B (a macrocyclic dimer) and C, both isolated from Tamarix pakistanica (Tamaricaceae).

1985). The antioxidant effect of tannins on lipids in biological systems was shown by inhibition of lipid peroxidation induced by adenine 5’diphosphate (ADP) and ascorbic acid in rat liver mitochondria, and by 42 Chemistry and Biology of Ellagitannins inhibition of lipid peroxidation induced by ADP and NADPH in rat liver microsomes. All tannins, except some small polyphenols and methylated polyphenols among twenty-five compounds, showed significant inhibitory effects in these two systems at a concentration of 1 μg/ml, ellagitannins being generally much more potent than condensed tannins.

Euphorbiales Geraniales Plantaginales Rhamnales Rafflesiales Celastrales Linales Umbellales Santales Polygalales Scrophulariales Lamiales Asterales Polemoniales Proteales Dipsacales Campanulales Gentianales Rubiales Cornales Myrtales Sapindales ASTERIDAE Haloragales Podostemales Ericales Rosales ROSIDAE Violales Diapensiales Capparales Polygonales Juglandales Myricales Leitneriales Casuarinales Eucomiales Ebenales Theales CARYOPHYLLIDAE Sarraceniales Lecythidales Primulales Caryophyllales Fagales Urticales Plumbaginales Batidales Salicales Malvales Dilleniales Hamamelidales DILLENIIDAE Trochodentrales Nymphaeales HAMAMELIDAE Aristolochiales Piperales Magnoliales Ranunculales Papaverales MAGNOLIDAE Fig.

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