The rate of metal-thiolate oxygenation by hydrogen peroxide has been measured for a model complex of nickel-containing superoxide dismutase (NiSOD) as 0.47 ± 0.03 M−1 s−1 at 303 K. Under typical synthetic conditions the reaction proceeds within seconds yielding S-oxygenate products. At biologically relevant H2O2 concentrations, half-life times extend to several hours or days. The results suggest H2O2 oxidation of NiSOD is not kinetically competent on the SOD timescale accounting for the lack of S-oxygenation byproducts.
                                    含
镍超氧化物歧化酶(NiSOD)的模型复合物在 303 K 条件下的
过氧化氢金属
硫酸盐氧合速率为 0.47 ± 0.03 M-1 s-1。在
生物相关的 
H2O2 浓度下,半衰期延长至数小时或数天。结果表明,NiSOD 的      氧化作用在 SOD 时间尺度上不具有动力学能力,这也是缺乏 S-氧合副产物的原因。