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Ascorbic Acid Metabolism of Older Adolescents¹

One Figure

Nutrition Laboratory of the Home Economics Experiment Station and School of Home Economics, Oregon State College, Corvallis, and Bureau of Human Nutrition and Home Economics, U. S. Department of Agriculture

1. The recommended allowance of the National Research Council, 100 mg for the 18-year-old boys and 80 mg for the 16- to 19-year-old girls, did not maintain mean plasma values at levels as high as their respective saturation means. For the girls all the mean values were above 0.80 mg%, ranging from 0.83 to 1.07. The boys' values ranged from 0.67 to 0.91 mg%; two out of the 7 values were below 0.80 mg%.

2. When the ascorbic acid intake was decreased to 10 mg less than the recommended allowance of the National Research Council, it was found that for 6 of the 8 girls the 70 mg intake of ascorbic acid was as effective as the 80 mg intake in maintaining the ascorbic acid concentration of the plasma, and that for 6 of the 7 boys an intake of 90 mg of ascorbic acid was as effective as 100 mg in maintaining the plasma ascorbic acid concentration (JJ's values were excluded).

3. The 10-day experimental periods were more desirable than the periods of one week. This was particularly true for the saturation period when some of the subjects had been on diets low in ascorbic acid prior to the study.

4. The data in this study were analyzed statistically by testing the significance of differences betweens means and by analysis of variance.

² The data in this paper are taken from the thesis presented by Bessie L. Davey to the Graduate School faculty of Oregon State College in partial fulfillment of the requirements for the Ph.D. degree, June, 1949. Further details will be found in the thesis.

Manuscript received 18 April 1949.

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