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Bioavailability of Zinc from Defattd Soy Flour, Soy Hulls and Whole Eggs As Determined by Intrinsic and Extrinsic Labeling Techniques^1,2,3,

Department of Foods and Nutrition, Purdue University, West Lafayette, IN 47907

Bioavailability of zinc from diets prepared from intrinsically and extrinsically labeled autoclaved, defatted soy flour and scrambled, freeze-dried egg was investigated in male rats marginally depleted in zinc. In one study, retention of zinc from intrinsically labeled soybean flour (73%) was significantly less than from ⁶⁵ZnCl₂ extrinsically added to a soy flour-based diet (80%). Zinc from intrinsically labeled soybean hulls and from soy flour diets containing 10% soybean hulls extrinsically labeled with ⁶⁵ZnCl₂ was as available as the zinc from the extrinsically labeled soy flour diet. In a second study, extrinsic and intrinsic labeling techniques gave a similar assessment of bioavailability of zinc from egg- and soy flour-based diets when extrinsic labeling was accomplished by thoroughly mixing ⁶⁵ZnCl₂ with the protein source prior to incorporation into the diet. Absorption of ⁶⁵Zn was greater from egg diets than from soy flour diets and of intermediate value from mixed soy flour and egg (50:50, wt/wt) diets regardless of which protein source was labeled, indicating that the zinc entered a common pool.

KEY WORDS: • zinc • bioavailability • soy • eggs • extrinsic • intrinsic

¹ Abstracts of this study have appeared: Stuart, M. A., Meyer, N. A. & Weaver, C. M. (1982) Bioavailability of zinc from defatted soy Bour as determined by intrinsic and extrinsic labeling techniques. Fed. Proc. 41. 780 (abs.); Meyer, N. R. & Weaver, C. M. (1983) Bioavailability of zinc from soy flour and egg diets as determined by intrinsic and extrinsic labeling techniques. Fed. Proc. 42, 823 (abs.)

² Journal Paper No. 9312. Indiana Agricultural Experiment Station, West Lafayette. IN 47907.

³ Supported in part by a grant from the American Egg Board.

⁴ To whom requests for reprints should be sent.

Manuscript received 23 December 1982.