双苄基
DPPH
化学
抗氧化剂
分馏
白藜芦醇
石斛
类黄酮
色谱法
有机化学
立体化学
植物
生物化学
生物
作者
Xue Zhang,Jiaming Xu,Jue Wang,Nai‐Li Wang,Hiroshi Kojima,Sumumu Kitanaka,Xin‐Sheng Yao
摘要
Bioassay-guided fractionation of the 60% ethanol extract of the stems of Dendrobium nobile using the DPPH assay led to the isolation of two new bibenzyl derivatives, nobilin D (1) and nobilin E (2), and a new fluorenone, nobilone (3), together with seven known compounds (4-10). Their structures were determined on the basis of spectroscopic analyses. Compounds 1, 2, 4, 7, 8, and 10 exhibited significant antioxidant activity higher than or equivalent to vitamin C in the DPPH assay, and compounds 1, 3, 4, and 7-10 displayed higher antioxidant activity than vitamin C in the ORAC assay. Compounds 1, 2, and 10 also exhibited stronger inhibitory effects on NO production than resveratrol.
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