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Tannins from Betel Nuts
Author(s) -
Ma YingTsun,
Hsu FengLin,
Lan ShuJan J.,
Chen ChiehFu
Publication year - 1996
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.199600013
Subject(s) - chemistry , proanthocyanidin , catechin , thiolysis , stereochemistry , acetone , polyphenol , biochemistry , antioxidant
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 1 H NMR and 13 C 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 C 4 ‐C 8 linked (‐)‐epicatechin in the upper units whereas the (+)‐catechin in the terminal unit had C 4 ‐C 8 or C 4 ‐C 6 linkage.