Patent ID: 9603377
Date: 2017-03-28
CPC Classifications: A23J,A23L,A23V

Claim:
1. A method of producing a soy protein product having a soy protein content of at least about 60 wt % (N×6.25), dry weight basis (d.b.), which comprises: (a) extracting a soy protein source with an aqueous calcium salt solution to cause solubilization of soy protein from the protein source and to form an aqueous soy protein solution, (b) separating the aqueous soy protein solution from residual soy protein source, (c) concentrating the aqueous soy protein solution while maintaining the ionic strength substantially constant by using a selective membrane technique, (d) optionally diafiltering the concentrated soy protein solution, (e) diluting the concentrated soy protein solution into water to cause the formation of a precipitate, (f) acidifying the mixture of precipitate and diluting water to a pH of about 1.5 to about 4.4 to re-solubilize the protein and form a clear soy protein solution, (g) concentrating the clear acidified soy protein solution while maintaining the ionic strength substantially constant by using a selective membrane technique, (h) optionally diafiltering the concentrated clear acidified soy protein solution, and (i) drying the concentrated and optionally diafiltered clear acidified soy protein solution.