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The reactivity of the (−)-epicatechin structure towards caffeoylquinic acid o-quinones was studied in an apple juice model solution. The approach consisted in considering separately the reactivities of the two phenolic moieties of an (−)-epicatechin molecule: phloroglucinol and 4-methylcatechol were chosen to represent A- and B-rings, respectively. The oxidation products were characterised by RP-HPLC...
(+)-Catechin oxidation was carried out in aqueous systems using grape polyphenoloxidase as catalyst. Eight fractions corresponding to the major products formed at pH 3 and 6 were purified using HPLC at the preparative and semi-preparative scale. Structural characterization using UV-visible detection and mass spectrometry indicated that they corresponded to (+)-catechin dimers including two yellow...
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