In this communication, we have described the activation of several xenobiotics by glucose oxidase from Aspergillus niger. The following compounds are readily reduced by d-glucose, in the presence of glucose oxidase: p-nitroso-N,N-dimethylaniline, methyl-1,4-benzoquinone, and 7,7,8,8-tetracyano-quinodimethane. In each case, the products of enzymatic reduction undergo a dismutation reaction with the parent compound and thus afford the formation of free radicals. In some cases, and at an appropriate pH value, the transformation of a parent compound into free radicals is almost quantitative. Under optimal conditions, free radicals are stable for several minutes in aqueous solutions under physiological conditions.
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