QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Stuart, S. M. Articles by Erdman, J. W. Search for Related Content PubMed PubMed Citation Articles by Stuart, S. M. Articles by Erdman, J. W., Jr.

Bioavailability of Zinc to Rats as Affected by Protein Source and Previous Dietary Intake^1,2,

Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907 ^* Department of Food Science, University of Illinois, Urbana, IL 61801

The bioavailability of zinc from defatted soy flour, dried chicken meat or mixed (50:50 dry weight basis) soy flour and chicken meat included in egg white-based diets was investigated in rats. Following a 6-d experimental diet (9 ppm Zn) feeding period, marginally zinc-depleted weanling rats were fed a test meal, identical in composition to the experimental diet except that the protein source was labeled either intrinsically or extrinsically with ⁶⁵Zn. Retention of ⁶⁵Zn from the chicken test meal was significantly higher than that from the soy test meal. Retention of ⁶⁵Zn from the mixed soy/chicken test meal was midway between the retention values for either protein alone regardless of which protein source was labeled. Intrinsic and extrinsic labeling techniques resulted in similar assessment of zinc bioavailability. Additionally, the influence of previous dietary protein source on zinc retention from a soy test meal was investigated. Retention of ⁶⁵Zn from an intrinsically labeled soy test meal was higher in rats adapted to chicken protein than in rats adapted to soy protein. The levels of tibia zinc and tibia ⁶⁵Zn were associated with whole-body retention of ⁶⁵Zn.

KEY WORDS: • bioavailability • chicken • dietary adaptation • extrinsic • intrinsic • soy • zinc

¹ An abstract of this study has appeared: Stuart, M.A., Weaver, C.M., Ketelsen, S.M. and Erdman, J.W., Jr. (1983) Bioavailability of ⁶⁵Zn to rats from chicken and soy diets. Fed. Proc. 42, 392(abs.583).

² Journal Paper No. 10,104, Indiana Agricultural Experiment Station, West Lafayette, IN 47907.

³ Present address: University of Kentucky Medical Center, Dept. of Gastroenterology, Lexington, KY 40536.

⁴ To whom reprint request should be sent.

Manuscript received 21 March 1985. Revision accepted 19 March 1986.