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取体重１５～２０ｇ雄性小白鼠，随机分为四组：白果组、白果＋Ｏ３组、Ｏ３组、对照组，每组１０只。白果组每天灌胃白果提取液１０ｍｌ／ｋｇ；白果＋Ｏ３组除每天灌胃白果提取液外，隔天放入Ｏ３染毒柜中；Ｏ３组每天灌胃生理盐水１０ｍｌ／ｋｇ，并隔天放入Ｏ３染毒柜中；对照组在室内自由取食饮水。２０天后处死小白鼠取肝脏测定超氧化物歧化酶活性，结果表明，Ｏ３组肝脏ＳＯＤ活性明显高于对照组（Ｐ＜０．０５），其它各组之间无显著性差异。
Male mice weighing 15-20 g were randomly divided into four groups: ginkgo group, ginkgo + O3 group, O3 group and control group, with 10 rats in each group. The ginkgo group was gavaged with ginkgo extract 10ml / kg every day. The ginkgo + O3 group was gavaged with Ginkgo biloba extract every other day and placed in O3 exposure cabinet the next day. O3 group was given normal saline 10ml / kg every day, O3 exposure cabinet; control group in the indoor free access to drinking water. Twenty days later, the mice were sacrificed to determine the activity of superoxide dismutase (SOD). The results showed that SOD activity in O3 group was significantly higher than that in control group (P <0.05), and no significant difference was observed in other groups.