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用氮蓝四唑（NBT）光还原法，对六月霜中提取物清除超氧离子自由基O-·2的效果进行了测定。结果显示，六月霜提取物对超氧离子自由基有较强的清除效果，清除效果与提取物中黄酮浓度有关，当黄酮浓度达到一定值时，对O-·2的清除效果可高达88．41％。提取物与抗坏血酸（VC）进行了对照实验，结果显示其对O-·2的清除能力比VC高。六月霜提取物在VC－CU2+－H2O2体系中，对OH·自由基的清除效果的研究显示，最高清除率为84．02％。
The effect of the removal of superoxide radical O-·2 from the extracts of June cream was determined by the photoreduction method of nitrogen blue tetrazolium (NBT). The results showed that the June cream extract had a strong scavenging effect on superoxide radicals. The scavenging effect was related to the concentration of flavone in the extract. When the flavonoid concentration reached a certain value, the removal effect on O-·2 was as high as 88. .41%. The extract was subjected to a control experiment with ascorbic acid (VC), and the results showed that its ability to scavenge O-·2 was higher than that of VC. In the VC-CU2+-H2O2 system, the study on the scavenging effect of OH radicals by June cream extracts showed that the highest clearance rate was 84.02%.