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氧化剂、还原剂处理前后，Ｌ－ＳＯＤ的活性及紫外光谱发生变化，Ｈ２Ｏ２使Ｆｅ（Ⅲ）吸收增强，同时钝化Ｌ－ＳＯＤ的活性；加入保险粉后，Ｌ－ＳＯＤ重新活化，Ｆｅ（Ⅲ）吸收减弱．ＮＥＭ封闭Ｃｙｓ后，Ｌ－ＳＯＤ紫外吸收谱发生变化，且活性减弱．说明Ｆｅ辅基及Ｃｙｓ是活性发挥的必需基团．
The activity of L-SOD and the UV spectrum changed before and after oxidant and reductant treatment. H 2 O 2 enhanced Fe (Ⅲ) absorption and passivated the activity of L-SOD. Absorption weakened. After NEM blocked Cys, the UV absorption spectrum of L-SOD changed, and its activity decreased. It is demonstrated that Fe and Cys are essential groups for activity.