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用ＮＢＴ（四氮唑蓝）光还原法测定首乌提取液对Ｏ２的清除作用。结果表明：首乌提取液对Ｏ２有清除作用。清除率达５０％时首乌浓度相当于０．４５９ｇ生药／ｍｌ，提示首乌有抗衰老作用。
The scavenging effect of Shouwu extract on O2 was determined by NBT (tetrazolium blue) photoreduction method. The results showed that the extract of Shouwu had scavenging effect on O2. When the clearance rate reaches 50%, the concentration of Shouwu is equivalent to 0.459g crude drug/ml, suggesting that Shouwu has anti-aging effect.