Abstract
At physiological pH values, nickel(II) complexes of oligopeptides containing histidine in the third position can quench superoxide ion (O 2 −) more easily than other Ni(II)-oligopeptide complexes. Furthermore, it is evidenced that Ni(II) complexes of oligopeptides containing histidine in the third position can catalyze the disproportionation of hydrogen peroxide (H 2O 2) to yield O 2 −, detected by electron spin resonance (ESR) spin trapping and nitro blue tetrazolium (NBT) methods.
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