Abstract:Phytate causes poor absorption of essential electrolytes and minerals,and binds to proteins and co-precipitates with isoelectric soy protein isolates.We studied the effect of pH and divalent cations (Ca2+ and Mg2+) on co-preciphate of phytates with soybean storage proteins during fractionating soy proteins.A 2-step fractionation procedure was used.In the absence of divalent cations,the dominant phytate-protein interaction was that of phytate-β-conglycinin,within the pH 4.0-5.5,then,phytate-1-conglycinin,phytate-glycinin and glycinin-phytate-β-conglycinin interaction may be co-existed with the pH increases.