金银花水提取液抗氧化作用研究
3.3 金银花水提液对O2-·的作用 以1∶5(0.2g干花/ml)的金银花液为样本，研究不同加样量超声波处理的和直接水煮的金银花水提液对O2-·的作用，实验结果见图2。图2 不同量金银花提取液对O2-·的清除作用
由图2可知，超声波处理的和直接水煮的金银花水提液对O2-·都具有较强的清除作用，且作用的趋势和能力一致。当它们的加入量不超过250μl时，对O2-·的清除率随加入量的增加呈线性上升;以后随加入量的增加，其清除率基本不增加。
本文研究的金银花的两种提取液除对H2O2的清除作用较弱外，对·OH、O2-·都具有较强的清除作用，因而金银花值得作为抗氧化剂进一步开发。
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