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PREFACE CHAPTER 1 The Scope of Vegetable Tannin Chemistry Introduction II The Structure of Collagen III The Mechanism of Vegetable Tanna...
Condensed TanninsAnalysis of the Extracts Introduction II Preparation of Plant Extracts III Qualitative Analysis of Flavonoid Compounds IV Isolatio...
17 other sections not shown
acetate alcohol analysis aqueous bark biosynthesis bonding Brown catechin CH₂ chemical chemistry Chinese chromatographic collagen compounds condensed tannins configuration confirmed considerable containing COOH corresponding derivatives ellagic acid ellagitannins enzymic epicatechin esters ether evidence extract flavan-3-ols flavone flavonoid flavonoid compounds followed formation Freudenberg further gallic acid gallotannins gave give glucose H OH Haworth heartwood HOOC hydrogen hydrolysis hydroxyl groups indicated isolated Justus Liebigs Annln later leaves Liebigs Annln Chem lignin linkages Mayer MeO OMe methods methyl molecular molecule natural observations obtained occurring OH H OH HO OH OH OH OH OMe OMe oxidation paper chromatographic particular pathways pattern phenolic plant polymerization polyphenols position possible precursors prepared present probably reaction readily respectively ring Roux Schmidt separation showed shown similar solution species structure studies substances suggested synthesis Table tion units values various vegetable tannins yellow yield он