石崖茶水提取物抗氧化活性研究

[目的]研究石崖茶水提取物经大孔树脂用不同浓度乙醇洗脱后各洗脱物的抗氧化活性。[方法]石崖茶水提后,过大孔树脂柱,用不同浓度乙醇洗脱,以V_C做参比,测定大孔树脂不同浓度乙醇冲洗物对DPPH自由基、羟基自由基、超氧阴离子自由基的清除率及还原能力。[结果]70%乙醇洗脱物具有较好DPPH自由基的清除率(68.8%),各洗脱物对羟基自由基、超氧阴离子自由基的清除率及还原能力较弱。[结论]该研究为进一步挖掘该植物的研究与应用价值提供依据。

Four new sesquiterpene derivatives from Dendrobium findlayanum

Three new sesquiterpene glycosides with alloaromadendrane and ylangene-derived type aglycones,named dendrofindlayanosides A-C(1-3),one new cyclopacamphane type sesquiterpene named dendrofindlayanobilin A(4),together with five known compounds have been isolated from stems of Dendrobium findlayanum.Their structures were determined on the basis of spectroscopic and chemical methods.