对益智提取挥发油后的仁、益智的茎和叶的提取物清除超氧阴离子自由基(O_2~-)的作用进行了研究。采用分光先度法研究了提取物对O_2~-的清除作用,提取剂用石油醚、乙醇和乙酸乙酯。结果表明,各提取物对O_2~-均有清除作用,其清除O_2~-的能力大小顺序依次为:益智的叶>益智的茎>提取挥发油后的益智仁。特别需要提示的是0.1％(w/w)益智的叶的石油醚及乙酸乙酯提取物对O_2~-的清除能力与1.3×10~(-3)mol/L抗坏血酸接近。 The effects of superoxide anion free radical (O 2 -) scavenging by extracts from kernels and leaves of the cultivar of Zhiyi, which was extracted from the volatile oil of Zhizhi were studied. The scavenging effect of the extract on O 2 - - was studied by the spectrophotometric method. The extractant was petroleum ether, ethanol and ethyl acetate. The results showed that all extracts had scavenging effect on O 2 -, and their ability to clear O 2 - was in the following order: puzzle leaves> puzzle stems> Yizhiren after volatile oil extraction. It is particularly important to note that the 0.1% (w/w) leaf-derived petroleum ether and ethyl acetate extracts have an ability to scavenge O_2~- similar to 1.3×10 −3 mol/L ascorbic acid.