Antimalarial Activity of a Riboflavin Analog against Plasmodium vinckei in Vivo and Plasmodium falciparum in Vitro

William B. Cowden Department of Experimental Pathology, John Curtin School of Medical Research, P.O. Box 334, Canberra ACT 2601, Australia

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Geoffrey A. Butcher Zoology Department, The Faculties, Australian National University, Canberra, Australia

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Nicholas H. Hunt Department of Experimental Pathology, John Curtin School of Medical Research, P.O. Box 334, Canberra ACT 2601, Australia

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Ian A. Clark Zoology Department, The Faculties, Australian National University, Canberra, Australia

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Fumio Yoneda Faculty of Pharmaceutical Sciences, Kyoto University, Sakyo-Ku, Kyoto, Japan

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The riboflavin analog 10-(4′-chlorophenyl)-3-methylflavin was found to have significant activity against Plasmodium vinckei vinckei when administered orally and parenterally; it was active against P. falciparum in culture. It inhibited mouse erythrocyte glutathione reductase in a dose-dependent manner. When administered orally, 5-deazariboflavin was not active in vivo although it has been shown to have activity against P. falciparum in vitro.

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