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Antioxidant properties of clozapine and related neuroleptics.

The antioxidant properties of clozapine and other related molecules were evaluated with the crocin bleaching test both in aqueous and non-aqueous environment. The tests of microsomal lipid peroxidation and carbonyl formation were also used. In aqueous solution, chlorpromazine and trifluoperazine appear particularly effective in the bleaching of crocin, while serotonin has an efficacy intermediate between those of phenothiazines and clozapine. The latter drug, on the other hand, in a non-aqueous medium shows an antioxidant power comparable to that of butylated hydroxytoluene, indicating that its antioxidant properties are better expressed in a hydrophobic environment of the type present in a biological membrane. In fact, in lipid peroxidation induced in microsomal membranes, clozapine, chlorpromazine, trifluoperazine and serotonin act as very good antioxidants; at low concentrations, clozapine appears to be the most efficient after butylated hydroxytoluene. Similarly, all these compounds markedly inhibit protein carbonyl formation, clozapine being one of the most efficient. Thus, under different in vitro experimental conditions, the neuroleptic drugs chlorpromazine and trifluoperazine and the antipsychotic substance clozapine act as very effective antioxidants; this property might, at least in part, be responsible for the physiological and clinical effects observed in vivo.