The effect of thiamine and oxythiamine preparations on the activities of vitamin B1-dependent enzymes in the body of white mice was studied. It was found that the cellulose oxythiamine derivative was similar to the initial compound in the character and intensity of its antivitamin action. It was also shown that the cellulose thiamine derivative had a prolonged effect in the body, which was manifested in a slower increase in the activities of transketolase, pyruvate dehydrogenase and in the amount of thiamine diphosphate in tissues of vitamin B1-deficient animals, as compared to the effect of thiamine.
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