THE EFFECT OF SUPPLEMENTING A RICE DIET WITH LYSINE, METHIONINE, AND THREONINE ON THE DIGESTIBILITY COEFFICIENT, BIOLOGICAL VALUE, AND NET PROTEIN UTILIZATION OF THE PROTEINS AND ON THE RETENTION OF NITROGEN IN CHILDREN
- 29 February 1964
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Biochemistry
- Vol. 42 (3), 385-393
- https://doi.org/10.1139/o64-046
Abstract
The effect of supplementing a rice diet providing about 1.3–1.4 g protein per kg body weight with lysine, methionine, and threonine individually or together on true digestibility coefficient (DC), biological value (BV), and net protein utilization (NPU) of the proteins has been studied in girls aged 8–9 years. The retention of nitrogen on the rice diet was very low (9.5% of intake in the first series and 8.5% in the second series). The BV and NPU of the proteins of rice diet were 64.1 and 52.9 in the first series and 66.6 and 54.9 in the second series. Supplementation of the rice diet with lysine or methionine or lysine + methionine brought about a significant improvement in N retention (12.6, 12.0, 13.5% of intake) and in the BV (68.3, 66.3, 69.3) and NPU (54.8, 55.7, 55.8). When the rice diet was supplemented with lysine and threonine, a highly significant improvement in the N retention (18.9% of intake) and in the BV (77.4) and NPU (63.4) was observed. Addition of methionine to rice diet containing lysine and threonine resulted in a further improvement in N retention, BV, and NPU of the diets. The net available protein (g/kg body weight) from the different diets were as follows: rice diet, 0.71; rice diet + lysine, 0.76; rice diet + methionine, 0.74; rice diet + lysine + methionine, 0.77; rice diet + lysine + threonine, 0.85; rice diet + lysine + threonine + methionine, 0.91; and skim milk powder diet, 0.96–0.98.Keywords
This publication has 14 references indexed in Scilit:
- Amino acid and protein requirements of infants, children and adultsIndian Journal of Pediatrics, 1963
- Amino Acid Requirements of Children: Minimal Needs of Threonine, Valine and Phenylalanine Based on Nitrogen Balance MethodJournal of Nutrition, 1962
- The metabolism of nitrogen, calcium and phosphorus in undernourished childrenBritish Journal of Nutrition, 1962
- Amino Acid Requirements of Children: Minimal Needs of Lysine and Methionine Based on Nitrogen Balance MethodJournal of Nutrition, 1961
- Amino Acid Requirements of ChildrenJournal of Nutrition, 1960
- The nutritive value of bread protein as influenced by the level of protein intake, the level of supplementation with L-lysine and L-threonine, and the addition of egg and milk proteinsBritish Journal of Nutrition, 1959
- Supplementation of Cereal Proteins with Amino AcidsJournal of Nutrition, 1958
- Effects on the General Health and Nutritional Status of Children of Partial Replacement of Rice in a Poor Vegetarian Diet by Tapioca FlourBritish Journal of Nutrition, 1954
- Amino Acids and Proteins, Their Place in Human Nutrition ProblemsJournal of Agricultural and Food Chemistry, 1953
- Nutritional Improvement of white Polished Rice by the Addition of Lysine and ThreonineJournal of Nutrition, 1951