Document Detail

Effect of diets containing dry beans (Phaseolus vulgaris, L.) on the rat excretion of endogenous nitrogen.
MedLine Citation:
PMID:  3806237     Owner:  NLM     Status:  MEDLINE    
Wistar rats of 60.5 +/- 5.0 g fasted for 24 h were injected intraperitoneally with 10 microCi 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 less than or equal to 0.01) with radioactivity in the feces. Positive correlation (P less than or equal to 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 less than or equal to 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.
A Costa de Oliveira; V C Sgarbieri
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of nutrition     Volume:  116     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  1986 Dec 
Date Detail:
Created Date:  1987-03-06     Completed Date:  1987-03-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2387-92     Citation Subset:  IM    
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MeSH Terms
Body Weight / drug effects
Dietary Proteins / administration & dosage*,  pharmacology
Glycine / pharmacology
Nitrogen / urine*
Plants, Medicinal*
Rats, Inbred Strains / urine*
Reg. No./Substance:
0/Dietary Proteins; 56-40-6/Glycine; 7727-37-9/Nitrogen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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