DESTINATION OF INJECTED RIBOFLAVIN : (V) EXCRETION OF RIBOFLAVIN IN THE URINE WHEN FAD AND FMN WERE INJECTED

Abstract

By the injection of 200μg of FAD, the excretion of flavins in the urine was rapidly increased. Twenty minutes after the injection, flavins in the urine consisted of 90% of riboflavin and 10% of FMN, and FAD was not found at all. Until six hours after the injection, the excreted flavin was reached to the amount of injected flavin. By the injection of 200μg of FMN, the amount of flavin in the urine was also increased. Twenty minutes after the injection, flavins in the urine consisted of more than 90% of riboflavin and less than 10% of FMN. Until six hours after the injection, the excreted flavin was reached to the amount of injected flavin.