Comparative Measurement of Zinc Absorption in Rats with Stable Isotope 70Zn and Radioisotope 65Zn
| Autor: | Morteza Janghorbani, Grace S. Lo, Fred H. Steinke, Bill T. G. Ting, Vernon R. Young |
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| Rok vydání: | 1981 |
| Předmět: |
Phytic acid
Nutrition and Dietetics Phytic Acid Zinc Radioisotopes Stable isotope ratio Feces analysis Radiochemistry Biological Availability Medicine (miscellaneous) chemistry.chemical_element Rats Inbred Strains Zinc Intestinal absorption Absorption Rats Bioavailability Excretion Feces chemistry.chemical_compound Animal science chemistry Isotopes of zinc Animals Zinc Isotopes |
| Zdroj: | The Journal of Nutrition. 111:2236-2239 |
| ISSN: | 0022-3166 |
| DOI: | 10.1093/jn/111.12.2236 |
| Popis: | The use of stable isotopes in a study on zinc bioavailability was evaluated in rats by comparing the zinc absorption of a stable isotope 70Zn and a radioisotope 65Zn simultaneously. The rats of low zinc status were obtained by feeding 1.2% phytic acid from sodium phytate and 12 ppm zinc from zinc sulfate in a semipurified diet for 14 days. The rats were then randomly assigned into five groups of ten rats. The rats were intubated with a test diet mixture with a phytate:zinc molar ratio of 0, 6.25, 12.5, 25 or 50 along with one microCi of 65Zn and 0.02 mg of 70Zn in 2.5 ml of intubating solution. Four hours after the intubation, rats were allowed to consume the diets having the same phytate:zinc ratio as used for intubation ad libitum. Feces were collected every 24 hours for a total of 168 hours. The 65Zn and 70Zn content of diets and fecal samples were determined and the percent of zinc absorption was calculated. The results of this study indicated that the zinc absorption determined by these two isotopes were highly correlated with a correlation coefficient ratio of 0.914. |
| Databáze: | OpenAIRE |
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