Abstract
Riboflavin content in blood and urine after the injection of riboflavin tetrapalmitate or riboflavin tetrabutyrate was determined. By intramuscular injection of riboflavin tetrapalmitate, the increase of riboflavin content in blood and in urine was not clearly observed. However, in the case of riboflavin tetrabutyrate, a slight increase of riboflavin in blood was demonstrated, and 30-40% of the injected riboflavin was excreted as free riboflavin in urine within 24 hours after the injection. These results indicate that fatty acid esters of riboflavin could be used as remedy which can be deposited in animal body.
