The effects of alpha-lactalbumin and whey protein concentrate on alpha-amino acids, calcium and phosphorus levels in blood and gastrointestinal tract of rats.
The effects of two dietary proteins on alpha-amino acids, calcium and phosphorus concentrations in plasma, stomach and intestine were investigated in rats trained to consume, in a single two-hour daily meal, diets containing a-lactalbumin (alpha-la) or whey protein concentrate (WPC) for two weeks. The results indicated that the concentrations of calcium and phosphorus in the gastrointestinal tract and that of a-amino acids in portal vein were not significantly influenced by the nature of diets. The amount of alpha-amino acids in the gastrointestinal tract of rats fed on WPC diet was significantly (p < 0.001) higher than that of alpha-la group. The levels of insoluble calcium and insoluble phosphorus in the small intestine were significantly (p < 0.001) higher in alpha-la group than in WPC group. These results indicated that the kinetics of alpha-amino acids, calcium and phosphorus were differently influenced by the nature of diet ingested, the sampling time and the sites of sample collections.
Pantako
O T
OT
Dairy Research Center, Department of Food and Nutrition Sciences, Faculty of Food and Agriculture Sciences, Laval University, Sainte-Foy, Quebec, Canada.
Amiot
J
J
D000596:Amino Acids / Q000097:blood / Q000378:metabolism*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002118:Calcium / Q000097:blood / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism / Q000494:pharmacology; D004063:Digestion / Q000187:drug effects / Q000502:physiology; D004064:Digestive System / Q000187:drug effects* / Q000378:metabolism; D005753:Gastric Mucosa / Q000378:metabolism; D007408:Intestinal Absorption; D007421:Intestine, Small / Q000378:metabolism; D007700:Kinetics; D007768:Lactalbumin / Q000378:metabolism / Q000494:pharmacology*; D008297:Male; D008894:Milk Proteins / Q000378:metabolism / Q000494:pharmacology*; D010758:Phosphorus / Q000097:blood / Q000378:metabolism*; D011169:Portal Vein / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D012995:Solubility; D013997:Time Factors; D000067816:Whey Proteins
D000596:Amino Acids; D004044:Dietary Proteins; D008894:Milk Proteins; D000067816:Whey Proteins; D010758:Phosphorus; D007768:Lactalbumin; D002118:Calcium