Abstract
The ability of the recently synthesized fluorescent analog of thiamin, 1,N6-ethenothiamin, to substitute for thiamin in rats in vivo has been studied. 50 micrograms of ethenothiamin/100 g body weight/day injected in rats allowed about one-half the weight gain with 50 micrograms/100g/day of thiamin. The activities of the pyruvate and alpha-keto-glutarate dehydrogenases of liver mitochondria were partially restored by 50 micrograms/100g/day of ethenothiamin. Ethenothiamin at this level did not appear to restore the branched-chain alpha-keto acid dehydrogenase activities to any extent. When 150 micrograms of ethenothiamin/100g body weight/day was injected, growth was optimum, but these enzyme activities still did not achieve normal levels.
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