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Stobadine, a pyridoindole derivative which has been synthesized in search of new antiarrhytmic drugs, was able to interact with alpha-diphenyl-beta-picrylhydrazyl (DPPH(.)) a stable free radical. Its scavenging potential was in the same order of magnitude as that of well known strong antioxidants. The scavenging effect of antioxidants tested increased in the order: stobadine, ascorbic acid, trolox, cysteine. Stobadine exerted a scavenging effect also towards alkoxyl radicals in a nonpolar solvent in the canthaxantin bleaching test. In this test stobadine was more effective than trolox.
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Horáková et al. (1995) studied this question.
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