The apparent efficacy of zinc and cerium sulfadiazine and the metabolic role of other trace metals suggested that sulfonamide salts of these might be of therapeutic value. There is also a possibility that metal salts of other sulfonamides might be useful. Accordingly other sulfonamide salts of zinc were prepared and studied in vitro and in vivo. Only zinc sulfathiazole and zinc methoxazole were as effective as zinc sulfadiazine in animal studies. The sulfadiazines of aluminum, chromium, cobalt, copper and iron were prepared and compared in vitro and in vivo. Only cobalt sulfadiazine appeared comparable to zinc and cerium sulfadiazine in healing burn wounds in rats. Studies on the molecular structure of silver sulfonamides disclosed the polymeric structure peculiar to silver sulfadiazine which appears to account for its unique properties. It is not yet known whether other metal sulfadiazines have this attribute.
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