Two new phenylethanol glycosides, phenylethyl-O-agr-l-rhamnopyranosyl-(1 → 2)-β-d-glucopyranoside (torenoside A, 1) and 2'-O-3,4-dihydroxy-β-phenylethoxy-O-agr-l-rhamnopyranosyl-(1'' → 3')-(4'-O-caffeoyl)-β-d-glucopyranoside (torenoside B, 2), along with the 17 known compounds (3-19) were isolated from Torenia concolor. Those structures were established on the basis of spectroscopic analysis including NMR spectroscopic techniques (13C, 1H, 1H-1H COSY, HMQC, HMBC, TOCSY, and NOESY). Moreover, phenylethanol glycosides 3-6 exhibited significant antioxidant activities in DPPH radical scavenging assay.
關聯:
JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 11(2)110~115
