Abstract
Acid-catalysed cleavage of 'purified' condensed tannin isolates from
Bruguiera gymnorrhiza (tancang) bark in the presence of phloroglucinol as a capture nucleophile gave, in addition to the expected procyanidin- and prodelphinidin-phloroglucinol adducts, 3-
O-α-L-rhamnopyranosyl-(+)-catechin-(4α→2)-phloroglucinol, thus providing evidence for covalently bonded glycoside moieties in the chain extender units of mangrove bark tannins.
Keywords
Bruguiera gymnorrhiza,
Rhizophoraceae,
angrove,
bark,
condensed tannins,
proanthocyanidins,
3-0-α,
-L-rhamnopyranosyl-{+)-catechin-{4α,
→,
2)-phloroglucinol,
flavan-3-ol glycosides
Citation
Achmadi, Suminar; Syahbirin, Gustini; Chonng, Elvin T.; Hemingway, Richard W. 1994. Catechin-3-0-rhamoside chain procyanidins from mangrove bark. Phytochemistry 35(1):217-219