Bioavailability of zinc in coagulated soy protein (tofu) to rats and effect of dietary calcium at a constant phytate:zinc ratio.

Abstract

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.

• Authors: R M Forbes, J W Erdman Jr, H M Parker, H Kondo, S M Ketelsen
• Journal: The Journal of nutrition (J Nutr) Vol. 113 Issue 1 Pg. 205-10 (Jan 1983) ISSN: 0022-3166 [Print] United States
• PMID: 6681628 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Carbonates
• Plant Proteins, Dietary
• Soybean Proteins
• Zinc Compounds
• Phytic Acid
• zinc carbonate
• Magnesium
• Zinc
• Calcium

Topics

• Animals
• Biological Availability
• Body Weight (drug effects)
• Bone and Bones (metabolism)
• Calcium (administration & dosage, pharmacology)
• Carbonates
• Chemical Precipitation
• Diet
• Egg White
• Magnesium (administration & dosage)
• Male
• Phytic Acid (administration & dosage)
• Plant Proteins, Dietary
• Rats
• Rats, Inbred Strains
• Soybean Proteins
• Soybeans
• Zinc (administration & dosage, metabolism)
• Zinc Compounds