Chemical constituents from green walnut husks and their antitumor activity in vitro / 中国中药杂志

Fourteen chemical constituents, including 5-hydroxy-4-methoxy-1-tetralone(1), 4,8-dihydroxy-1-tetralone(2), 4,5-dihydroxy-α-tetralone(3), blumenol B(4), dehydrovomifoliol(5), megastigm-5-ene-3,9-diol(6), juglanin B(7), blumenol C(8), loliolide(9), oleracone B(10), syringarsinol(11), pinoresinol(12), methyl 4-hydroxy-3-methoxybenzoate(13), and isovanillic acid(14), were isolated from the dichloromethane fraction of 95% methanol extract of green walnut husks by silica gel and MCI column chromatography, and Pre-HPLC. Their structures were determined by spectroscopic methods, such as NMR, MS and so on. Among them, compounds 1, 4-6, 8-13 were isolated from the green walnut husks for the first time, and compounds 4-6, 8, 10, 12, 13 were isolated from the Juglans genus for the first time. All of isolates were detected their inhibitory activities against HeLa, HGC-27 and Ht-29 cell lines by the MTT assay. The result showed that compounds 2, 3, 7, 9 and 11 exhibited inhibitory activity against the tested cell line. The IC_(50) of 7 were 26.5, 9.0, 25.4 μmol·L~(-1), respectively.

A new sesquiterpenoid from the roots of Stelleropsis tianschanica / 药学学报

Three sesquiterpenoids were isolated from the dichloromethane extract of the roots of Stelleropsis tianschanica Pobed through a combination of various chromatographic approaches, including silica gel, Sephadex LH-20, reverse phase C18 and so on. On the basis of spectroscopic data analysis, they were identified as (+)-guaia-l(10),ll-dien-9-one-5α-hydroxy (1), 4β,5βH-guai-9,7(11)-dien-12,8-olide-1α,8α-diol (2), 4α,5βHguai-9,7(11)-dien-12,8-olide-1α,8α-diol (3). The compound 1 is a new sesquiterpenoid, and the compound 3 was isolated for the first time from the genus Stelleropsis.