Abstract
The riboflavin content was determined by the lumiflavin fluorescence method and the ratio of 3-types of riboflavin (FMN, FAD and free form) by paper chromatography. Average content of riboflavin in the retina of bull frog was 1.06μg/g. Among the 3-types of riboflavin, FMN occupied the most part and FAD followed, but free form was not found.
