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Journal of Nutrition Vol. 86 No. 1 May 1965, pp. 82-88
Copyright © 1965 by American Society for Nutrition
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Metabolic Patterns in Preadolescent Children

XVI. Riboflavin Utilization in Relation to Nitrogen Intake1

Ruth E. Boyden and S. E. Erikson

School of Home Economics, University of Kentucky, Lexington, Kentucky

The riboflavin content of food, urine and feces was determined for 35 preadolescent girls fed controlled, adequate diets, the protein content of which, 18 to 88 g/day, constituted the experimental variable. Riboflavin in whole blood was determined on 24 subjects. Nitrogen intake and urinary riboflavin showed significant, positive correlation. About one-half the riboflavin intake was excreted in the urine. Correlation of intake and outgo of riboflavin was not significant. Mean fecal riboflavin values decreased sharply when nitrogen intake was reduced from 14.12 to 2.91 g/day. At the same time, the ratio of sucrose to lactose, in grams per day, increased from 104/31 to 195/3. Urinary creatinine and urinary riboflavin showed significant positive correlation as did riboflavin retention and energy balance. Riboflavin values in whole blood did not appear to be affected by differences in protein intake in 1956 when one-half the subjects were given about 2 g of protein and the other half about 3 g of protein/kg of body weight. In 1958 riboflavin blood values decreased from a mean of 21.3 to 11.4 µg/100 ml when protein intake was reduced to less than 1 g/kg of body weight but not so low as to prevent a retention of 0.3 g nitrogen/day.

1 The investigation reported in this paper (no. 64-9-67) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director. This study was a phase of the Southern Regional Research Project, "Requirements and Utilization of Selected Nutrients by Preadolescent Children," supported in part by funds appropriated to the U.S. Department of Agriculture under the Research and Marketing Act of 1946 and the Hatch Act, as amended, and in part by seven southern Agricultural Experiment Stations. The Human Nutrition Research Division of the Agricultural Research Service was a cooperator in this project.

Manuscript received 1 December 1964.




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