Tannins and Related Polyphenols of Rosaceous Medicinal Plants. XII. Roshenins A-E, Dimeric Hydrolyzable Tannins from Rosa henryi Boul.
作者:Takashi YOSHIDA、Wei-Sheng FENG、Takuo OKUDA
DOI:10.1248/cpb.40.1997
日期:——
Five new hydrolyzable tannin dimers, roshenins A-E, and eight known tannins and related polyphenols [(+)-catechin, (-)-epicatechin, procyanidins B-3 and B-4, sanguisorbic acid dilactone, sanguiins H-2, H-6 and lambertianin A], have been isolated from the root of Rosa henryi BOUL. The structures of roshenins A-E (9-12, 19), which have a sanguisorboyl group as a linking unit between monomeric components, were established on the basis of spectral and chemical evidence.
New ellagitannins from Tiencha and their inhibitory activity against dental plaque
作者:Fusako Nakano、Shozo Miyoshi、Toshiyuki Murakami
DOI:10.1007/s11418-017-1090-9
日期:2017.7
Four new galloyl-oxygen-diphenyl (GOD)-type ellagitannins, brambliins A–D (1–4), were isolated from the leaves of Rubus suavissimus. Their structures were elucidated by extensive spectroscopic analyses and the absolute configurations of 1–4 were determined by chemical and phytochemical evidence. These GOD-type ellagitannins inhibited the formation of dental plaque, which is beneficial for oral hygiene