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Type: Artigo de periódico
Title: Effect Of Diets Containing Dry Beans (phaseolus Vulgaris, L.) On The Rat Excretion Of Endogenous Nitrogen
Author: Costa de Oliveira A.
Sgarbieri V.C.
Abstract: Wistar rats of 60.5 ± 5.0 g fasted for 24 h were injected intraperitoneally with 10 μCi of [14C]glycine. One to two hours after injection the rats were fed a diet containing 10.53 ± 0.75% protein provided by dry beans or casein, or a protein-free diet and submitted to a 4-d nitrogen balance. Radioactivity in the feces of rats fed casein, cooked beans and raw beans was roughly 2, 5 and 10 times greater, respectively, than in the feces of those fed the protein-free diet. Apparent protein digestibility showed a strong negative linear correlation (r = -0.9805, P ≤ 0.01) with radioactivity in the feces. Positive correlation (P ≤ 0.01) was demonstrated between radioactivity and either total carbon or total nitrogen in the feces of rats injected with [14C]glycine. Mean value for the radioactivity in the urine of rats fed the different diets did not differ significantly (P ≤ 0.05). Endogenous nitrogen excretion of rats on bean diets was estimated by the ratio of total endogenous N to marker N, based on the protein-free diet. The results indicated that rats fed bean-containing diets excreted significantly more endogenous nitrogen than those fed the casein diet, even though the casein diet had stimulated twice as much endogenous excretion than the protein-free diet. As a consequence, apparent digestibility and biological value of bean protein are generally underestimated, although the 'real' biological value was not affected by the endogenous nitrogen excretion of the rat.
Citation: Journal Of Nutrition. , v. 116, n. 12, p. 2387 - 2392, 1986.
Rights: fechado
Date Issue: 1986
Appears in Collections:Unicamp - Artigos e Outros Documentos

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