... inhibition of metformin oxida-tion, in the presence of added hydrogen peroxide, wouldcome from the reaction of ÆOH radicals with H2O2.Anestimated value of the second order rate constant of k(ÆOH ... nodetectable effect of H2O2as an initiator of metforminoxidation in the absence of irradiation. However, underirradiation, there was a noticeable effect of the concentra-tion of H2O2(0.05, ... It can be noted that,because of the conjugation of the nitrogen electron pair [of NH2,NHandN(CH3)2]withtheC¼NH double bonds, thecharge transfe r process of ÆOH abstracting an electron...