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Calcium phytate: Effect of ph and molar ratio on in vitro solubility
Author(s) -
Grynspan Frida,
Cheryan Munir
Publication year - 1983
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02680350
Subject(s) - solubility , calcium , chemistry , molar , molar ratio , precipitation , salt (chemistry) , inorganic chemistry , phytic acid , limiting , phosphorus , nuclear chemistry , biochemistry , organic chemistry , dentistry , medicine , mechanical engineering , physics , meteorology , engineering , catalysis
Calcium and phytate phosphorus were highly soluble below pH 4 at all molar ratios of calcium (Ca) to phytic acid (PA) studied (0.512.67). As pH is increased above 4, there is a drop in solubility, the magnitude of which depends on the Ca:PA molar ratio. Above pH 6, the greatest calcium precipitation occurred at molar ratios between 4 and 6.5; both lower and higher Ca:PA molar ratios showed higher calcium solubility. In contrast, phytate phosphorus solubility decreased in proportion to the Ca:PA molar ratio, showing essentially complete precipitation above the Ca:PA ratio of 5. The pentacalcium phytate salt probably predominates when calcium is not limiting. Under calcium‐limiting conditions, the complexes resolubilize as the pH is increased above 7.