EFFECT OF DIETARY PROTEIN ON THE METABOLISM OF RIBOFLAVIN
- VernacularTitle:不同蛋白质营养条件下白鼠对于核黄素的需要量
- Author:
Liangti HSTANU
;
Huaichow WANG
;
Enfu YANG
- Publication Type:Journal Article
- From:
Acta Nutrimenta Sinica
1956;0(03):-
- CountryChina
- Language:Chinese
-
Abstract:
Weanling rats were placed on ribofiavin deficient diet containing 10 and 20% casein. After the cessation of growth and the development of symptoms of ariboflavinosis, the rata were divided into four groups and were fed the deficient diet supplemented with 0.5, 1.0, 2.0 and 4.0 mg of riboflavin per kg of diet. The animals were housed individually in raised bottom cages. Observations were made on the animal for food intake, growth rate, nitrogen and riboflavin contents of the liver and the urinary excretion of riboflavin. In one experiment, the activity of the liver xanthine oxidaae was also determined.The result shows that 2.0 mg riboflavin per kg of the diet is required for maximum growth rate and food intake, whether the dietary protein level is 10% or 20%. However, at the above level of riboflavin, there is a high urinary excretion of the vitamin when the dietary protein is at 10%. With a 20% casein diet, this phenomenon can only be observed with a higher vitamin supplementation level, i. e. 4 mg/kg of the diet.There is no difference in the riboflavin content of liver among different groups of rats fed with 10% casein diet, however, it increases with the increasing amount of riboflavin supplementation when the casein level is at 20%. At the lower level of vitamin supplementation the riboflavin content in the liver of rats on 10% casein diet is higher than that of the animals on 20% casein or 10% egg albumin diet. The activity of xanthine oxidase varies with the quantity and quality of the protein, and does not depend on the riboflavin content of the liver.The nitrogen content of the liver is independant of dietary riboflavin.
