Abstract
The present study was planned to investigate whether the ratio of FAD, FMN, FR in liver changes by supplying of the different dietary protein levels or not. Male albino rats of the Wistar strain were used. The results showed that the total riboflavin and FAD contents of liver rose as casein level increased, but in low or non-protein diets, the total riboflavin in liver was significantly decreased. It was found that the ratio of each flavin compound in liver was same as that in normal dietary protein level, even under the conditions such as the nitrogen balance crumbles. It was suggested from these results that although the total metabolism may scale down by feeding of low or non-protein diet, a definite mechanism may act to reserve flavoprotein necessary to maintain the metabolism in accordance with the protein intake.
