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Freeze-dried materials of cider apple pulp and skin were submitted to three successive solid-liquid extractions. The water-acetone extracts contained significant amounts of condensed tannins; thioacidolysis revealed that they were a mixture of highly polymerized procyanidins mainly constituted of (-)-epicatechin units. Electrospray ionization mass spectrometry showed a complete series of polymeric...
(+)-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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