Calcium Bioavailability of Vegetarian Diets in Rats: Potential Application in a Bioregenerative Life-Support System

Authors

  • KWANGOK P. NICKEL,

    1. Authors Nickel and Belury are with the Dept. of Foods & Nutrition, authors Nielsen and Smart are with the Dept. of Food Science, and author Mitchell is with the Dept. of Horticulture, Purdue Univ., West Lafayette, IN 47907. Direct inquiries to Dr. Martha A. Belury.
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  • S. SUZANNE NIELSEN,

    1. Authors Nickel and Belury are with the Dept. of Foods & Nutrition, authors Nielsen and Smart are with the Dept. of Food Science, and author Mitchell is with the Dept. of Horticulture, Purdue Univ., West Lafayette, IN 47907. Direct inquiries to Dr. Martha A. Belury.
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  • DEBRA J. SMART,

    1. Authors Nickel and Belury are with the Dept. of Foods & Nutrition, authors Nielsen and Smart are with the Dept. of Food Science, and author Mitchell is with the Dept. of Horticulture, Purdue Univ., West Lafayette, IN 47907. Direct inquiries to Dr. Martha A. Belury.
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  • CARY A. MITCHELL,

    1. Authors Nickel and Belury are with the Dept. of Foods & Nutrition, authors Nielsen and Smart are with the Dept. of Food Science, and author Mitchell is with the Dept. of Horticulture, Purdue Univ., West Lafayette, IN 47907. Direct inquiries to Dr. Martha A. Belury.
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  • MARTHA A. BELURY

    1. Authors Nickel and Belury are with the Dept. of Foods & Nutrition, authors Nielsen and Smart are with the Dept. of Food Science, and author Mitchell is with the Dept. of Horticulture, Purdue Univ., West Lafayette, IN 47907. Direct inquiries to Dr. Martha A. Belury.
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  • Journal paper no. 15130 of the Agricultural Experiment Station, Purdue Univ., West Lafayette, IN 47907.

  • We gratefully acknowledge the technical assistance of Carol Spahr, Anna Kempa-Steczko, and Tracy Raush. We thank Dr. Berdine R. Martin for insightful advice. This work was supported by NASA grant NAGW-2329.

ABSTRACT

Calcium bioavailability of vegetarian diets containing various proportions of candidate crops for a controlled ecological life-support system (CELSS) was determined by femur 45Ca uptake. Three vegetarian diets and a control diet were labeled extrinsically with 45Ca and fed to 5-wk old male rats. A fifth group of rats fed an unlabeled control diet received an intraperitoneal (IP) injection of 45Ca. There was no significant difference in mean calcium absorption of vegetarian diets (90.80 ± 5.23%) and control diet (87.85 ± 5.25%) when calculated as the percent of an IP dose. The amounts of phytate, oxalate, and dietary fiber in the diets did not affect calcium absorption.

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