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Tannins from Betel Nuts
Authors:Ying-Tsun Ma  Feng-Lin Hsu  Shu-Jan J Lan  Chieh-Fu Chen
Abstract:From the acetone extract of fresh-betel nuts, two procyanidin pentamers, two procyanidin tetramers and three procyanidin trimers, along with (+)-catechin, (-)-epicatechin, procyanidin A-l, procyanidin B-l, procyanidin B-2, and procyanidin B-7 were isolated. Based on 1H NMR and 13C NMR spectral data as well as the results of thiolysis degradation, the chemical structures of two series of oligomeric arecatannins A and B have been established. The arecatannins from betel nuts were found to be condensed-type tannins which possess (-)-epicatechin unit and (+)-catechin units. All arecatannins had C4-C8 linked (-)-epicatechin in the upper units whereas the (+)-catechin in the terminal unit had C4-C8 or C4-C6 linkage.
Keywords:Procyanidin  Proanthocyamdin  Flavan-3-ol  Arecatannin  Condensed tannin  Betel nut  Areca catechu
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