Radioisotope dilution technique for determination of zinc absorption in vivo.
A radioisotope dilution technique was adapted for determination of the absorbability of dietary zinc. In 16 growing rats given a casein diet with 12.8 mg Zn/kg dry matter, a mean apparent Zn digestibility of 72.4% was observed in a 6-day balance period 9 days after an intramuscular injection of 65Zn-ZnCl2. There was no significant difference in the specific radioactivity of zinc in blood plasma on day 15 and in urine collected from day 9 to day 15 used to assess the fecal excretion of endogenous zinc. Consequently, there was good agreement between the corresponding mean zinc absorbability (94.8 vs. 95.3%) calculated from these data.
D000818:Animals; D004032:Diet; D007273:Injections, Intramuscular; D007408:Intestinal Absorption; D008297:Male; D011865:Radioisotope Dilution Technique; D051381:Rats; D015032:Zinc / Q000008:administration & dosage / Q000378:metabolism*; D015037:Zinc Radioisotopes
D015037:Zinc Radioisotopes; D015032:Zinc