Abstract
It was observed that changes in riboflavin content of brain and liver of fasting rats intraperitoneally administered 600μg FAD (equivalent to 300μg riboflavin) were almost identical with the result of the previous work given 300μg riboflavin to rats. Namely, no change was observed riboflavin content of brain, but riboflavin content of the liver was decreased along with the decrease of liver nitrogen of rats given riboflavin or FAD. More than 99.8% were bound form of riboflavin in the liver, even if rats were fasted for 6 days.
