Patent ID: 9629381
Date: 2017-04-25
CPC Classifications: A23J,A23L,C07K

Claim:
1. A process of producing a soy protein product having a protein content of at least about 60 wt % (N×6.25) on a dry weight basis (d.b.), which comprises: (a) extracting a soy protein source, selected from the group consisting of soymeal, soy flakes, soy grits and soy flour with an aqueous calcium chloride solution to cause solubilization of soy protein from the soy protein source and to form a mixture of aqueous soy protein solution and residual soy protein source, wherein said aqueous calcium chloride solution has a concentration of about 0.10 to about 0.15 M and said mixture having a pH of about 4.5 to about 11; (b) optionally diluting the mixture of aqueous soy protein solution and residual soy protein source, (c) subjecting the mixture of aqueous soy protein solution and residual soy protein source to a pH adjustment step to a pH of about 1.5 to about 4.4 to provide a mixture of an acidified aqueous soy protein solution and residual soy protein source, (d) separating the acidified aqueous soy protein solution from the residual soy protein source, (e) concentrating the acidified aqueous soy protein solution while maintaining the ionic strength substantially constant using a selective membrane technique to form a concentrated soy protein solution, (f) optionally diafiltering the concentrated soy protein solution, wherein said concentration step and optional diafiltration step are effected until the concentrated and optionally diafiltered soy protein solution has been sufficiently purified so as, when dried, to provide a soy protein product with a protein source of at least about 60 wt % (N×6.25) d.b., and (g) drying the optionally diafiltered and concentrated soy protein solution to provide a soy protein product having a soy protein content of at least about 60 wt % (N×6.25) d.b., and (g) drying the optionally diafiltered and concentrated soy protein solution to provide a soy protein product having a soy protein content of at least about 60 wt % (N×6.25) d.b.