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⁶⁵Copper Absorption by Women Fed Intrinsically and Extrinsically Labeled Goose Meat, Goose Liver, Peanut Butter and Sunflower Butter

United States Department of Agriculture, Agricultural Research Service, Grand Forks Human Nutrition Research Center, Grand Forks, ND 58202

Absorption of stable ⁶⁵Cu incorporated intrinsically or extrinsically into foods was studied in women fed a diet marginal in Cu content. Isotopic enrichment was 73.1 ± 1.0 atom percent ⁶⁵Cu in goose breast meat, 74.9 ± 0.5 atom percent in goose liver, and 55–69.5 atom percent in two crops of peanuts. Seven women were fed a basal diet containing 1.25 mg Cu/d. At 4-wk intervals, they were fed test meals over a 3-d period; each set of meals contained one of the labeled test foods in amounts with similar copper content. Absorption of ⁶⁵Cu from intrinsically labeled liver was (mean ± SD) 65 ± 4%; extrinsic liver, 65 ± 10%; E/I = 1.00 ± 0.16. ⁶⁵Cu absorption from intrinsically labeled goose breast meat was 54 ± 6%; extrinsic meat, 52 ± 10%; E/I = 0.97 ± 0.18. ⁶⁵Cu absorption from intrinsically labeled peanut butter was 58 ± 15%; extrinsic peanut butter, 54 ± 10%; E/I = 0.93 ± 0.11. ⁶⁵Cu absorption from extrinsically labeled sunflower butter was 50 ± 2%. There were no differences in absorption of intrinsic and extrinsic Cu from these foods. Absorption of Cu was significantly higher from goose liver than from goose meat or sunflower butter (P < 0.05). With a dietary intake of 1.25 ± 0.20 mg Cu/d, Cu balance, exclusive of surface losses, was essentially zero (0.01 ± 0.13 mg/d) in the seven subjects.

KEY WORDS: • copper absorption • intrinsic labeling • extrinsic labeling • copper bioavailability

¹ M. A. Stuart is currently at the University of Kentucky, Department of Nutrition and Food Sciences, 212 Funkhouser Building, Lexington, Kentucky 40506-0054.

² T. L. Starks is currently employed by Searle Laboratories, Onalaska, WI 54560.

Manuscript received 7 April 1988. Revision accepted 8 August 1988.

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