The influence of vegetable fibers on mineral balance in the rat Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qf85nd881

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  • Dietary fiber has been suggested as interfering with mineral utilization. The influence of broccoli florets and wastes, cauliflower heads and wastes, wheat bran and Metamucil on mineral uptake by the rat was determined using balance studies. All results were compared to control animals fed diets containing 10% hydrolyzed cellulose. Utilization of Ca, Mg, Cu, Zn and Fe were determined to be 62, 33, 23, 42, and 52% respectively for control animals. The uptake of Mg, Zn and Fe were significantly reduced to 12, 16 and 18% respectively from broccoli florets. Broccoli wastes decreased absorption of Zn to 14% and created a negative iron balance. Cauliflower heads improved Zn assimilation to 61%. Cauliflower wastes depressed Ca absorption to 26% and caused Mg balance to be negative. Wheat bran improved utilization of Ca and Zn to 88 and 54% respectively. Metamucil increased uptake of Ca to 88% and Mg to 53%. Copper balance was unaffected by any test diet. To better understand results of balance trials, the bioavailability of Fe from some sources was measured. The relative biological values (RBV) of endogenous Fe in broccoli, cauliflower, Brussel sprouts and wheat bran were determined to be 93, 88, 83, 98% respectively. These values were obtained using rats fed control diets containing 5% hydrolyzed cellulose and ferrous sulfate (RBV = 100). The efficiency - true bioavailability of utilizing dietary Fe is approximately one-half of the RBV. These values agree well with apparent uptake of iron by animals in the balance trials for all diets except broccoli. This exception may be due to differences in the amount and source of broccoli fed. High dietary levels of broccoli florets and wastes appear to interfere with utilization of Fe and Zn. Cauliflower wastes depress absorption of Ca and Mg. With the exceptions noted, dietary fiber from plant sources does not appear to decrease the utilization of minerals by the rat. The nature of mineral complexes in plants may be more important in defining the degree of its absorption.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-01-03T16:46:22Z (GMT) No. of bitstreams: 1 TINSLEYJOEL1980.pdf: 799538 bytes, checksum: 77743d63bf4d3502c20842d908d57f45 (MD5)
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