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Zinc, Iron and Copper Availability as Affected by Orthophosphates, Polyphosphates and Calcium
Author(s) -
ZEMEL MICHAEL B.,
BIDARI MOLOOK T.
Publication year - 1983
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1983.tb10791.x
Subject(s) - zinc , feces , weanling , chemistry , phosphorus , calcium , sodium hexametaphosphate , zoology , copper , food science , environmental chemistry , endocrinology , biology , sodium , ecology , organic chemistry
Male weanling tats were fed an adequate diet supplemented with 0.42% P from either hexametaphosphate or orthophosphate, each at two levels of Ca intake (0.53% or 1.06%). Polyphosphates represented 13% of the total fecal phosphorus at the 0.53% Ca intake; this fraction was increased to 27% at the 1.06% Ca intake. Hexametaphosphate caused a 15% increase in fecal iron, a 12% decrease in liver iron and a 15% decrease in fecal zinc losses. These effects were markedly enhanced by supplemental Ca. Orthophosphate was without effect at the 0.53% Ca intake, but caused an 11% increase in fecal zinc losses at the 1.06% Ca intake.