Bioavailability of zinc in coagulated soy protein (tofu) to rats and effect of dietary calcium at a constant phytate:zinc ratio.
An assay was conducted with young albino rats to compare the bioavailability of zinc contained in calcium- and in magnesium-precipitated tofu to zinc supplied as the carbonate in egg white diets. Relative availability of zinc from both tofu preparations was 51% as measured by weight gain and 36-39% for log micrograms tibia zinc accumulation. In a separate experiment with zinc supplied at 9 mg/kg in all diets, the effect of increasing dietary calcium on weight gain and tibia zinc accumulation was tested. Performance of tofu-fed rats relative to zinc carbonate-fed rats at 0.4, 0.7 and 1.2% calcium was, respectively: 92, 67 and 48% for weight gain, and 70, 58 and 61 for tibia zinc content.
D000818:Animals; D001682:Biological Availability; D001835:Body Weight / Q000187:drug effects; D001842:Bone and Bones / Q000378:metabolism; D002118:Calcium / Q000008:administration & dosage / Q000494:pharmacology*; D002254:Carbonates; D011232:Chemical Precipitation; D004032:Diet; D004529:Egg White; D008274:Magnesium / Q000008:administration & dosage; D008297:Male; D010833:Phytic Acid / Q000008:administration & dosage; D014674:Plant Proteins, Dietary; D051381:Rats; D011919:Rats, Inbred Strains; D030262:Soybean Proteins; D013025:Glycine max; D015032:Zinc / Q000008:administration & dosage / Q000378:metabolism*; D017967:Zinc Compounds
D002254:Carbonates; D014674:Plant Proteins, Dietary; D030262:Soybean Proteins; D017967:Zinc Compounds; D010833:Phytic Acid; C036650:zinc carbonate; D008274:Magnesium; D015032:Zinc; D002118:Calcium