Document Detail

Effects of foods rich in polyphenols on nitrogen excretion in rats.
MedLine Citation:
PMID:  2329389     Owner:  NLM     Status:  MEDLINE    
The extent to which tea, cocoa and carob (foods rich in polyphenols) influence fecal nitrogen (N) excretion was investigated in rats. The studies took into account the methylxanthine contents of tea and cocoa as well as the poor digestibility of cocoa nitrogen. Balance measurements indicated that all three food sources significantly increased fecal nitrogen excretion relative to methylxanthine-matched control diets (p less than 0.01). In the case of cocoa, virtually all the increase could be attributed to the poor digestibility of cocoa protein itself (estimated to be only 28-30% of total N in cocoa powder). There appeared to be no other effects. With extracts of tea and carob, however, the increased excretion of N in feces resulted either from a decreased digestibility of other dietary protein, through interaction with their polyphenols, or from a stimulation of the excretion of endogenous (body) nitrogen. With respect to the latter possibility, a preliminary investigation with the stable isotope of nitrogen (15N) showed that tea produced a marked increase in the excretion of endogenous nitrogen. These studies, therefore, indicate that foods rich in polyphenols have varying effects on N excretion in feces and that, in the case of tea at least, the loss of endogenous nitrogen may be a major contributing factor.
Y Shahkhalili; P A Finot; R Hurrell; E Fern
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of nutrition     Volume:  120     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-05-31     Completed Date:  1990-05-31     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  346-52     Citation Subset:  IM    
Nestlé Research Centre, Nestec LTD., Vers-chez-les-Blanc, Lausanne, Switzerland.
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MeSH Terms
Body Weight
Cacao / analysis
Dietary Proteins / analysis
Drug Interactions
Energy Intake
Feces / analysis*
Nitrogen / analysis*,  urine
Nutritional Physiological Phenomena*
Phenols / administration & dosage,  isolation & purification,  pharmacology*
Plant Extracts / administration & dosage
Plant Gums
Polymers / administration & dosage,  isolation & purification,  pharmacology*
Polysaccharides / analysis
Rats, Inbred Strains
Tea / analysis
Xanthines / analysis
Reg. No./Substance:
0/Dietary Proteins; 0/Flavonoids; 0/Galactans; 0/Mannans; 0/Phenols; 0/Plant Extracts; 0/Plant Gums; 0/Polymers; 0/Polysaccharides; 0/Tea; 0/Xanthines; 0/polyphenols; 28109-92-4/methylxanthine; 7727-37-9/Nitrogen; 9000-40-2/locust bean gum

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

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