期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 65, 期 39, 页码 8727-8743出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.7b02998
关键词
zinc phytate; zinc citrate; nitrogen donor ligands; sulfur donor ligands; isothermal titration calorimetry; density functional theory; bioavailability
资金
- China Scholarship Council (CSC) [201406170034]
Aqueous solubility of zinc phytate (K-sp = (2.6 +/- 0.2) X 10(-47) mol(7)/L-7), essential for zinc bioavailability from plant foods, was found to decrease with increasing temperature corresponding to Delta H-dis of -301 +/- 22 kJ/mol and Delta S-dis of -1901 +/- 72 J/(mol K). Binding of zinc to phytate was found to be exothermic for the stronger binding site and endothermic for the weaker binding site. The solubility of the slightly soluble zinc citrate and insoluble zinc phytate was found to be considerably enhanced by the food components with oxygen donor, nitrogen donor, and sulfur donor ligands. The driving force for;the enhanced solubility is mainly due to the complex formation between zinc and the investigated food components rather than ligand exchange and ternary complex formation as revealed by quantum mechanical calculations and isothermal titration calorimetry. Histidine and citrate are promising ligands for improving zinc absorption from phytate-rich foods.
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