| 主权项 |
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, 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) optionally 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, and (e) optionally drying the concentrated and optionally diafiltered soy protein solution,wherein:
(A) the aqueous soy protein solution resulting from step (b) is heat treated to precipitate soy protein therefrom and either (i) the entire heated solution is dried to provide the soy protein product or (ii) precipitated soy protein is recovered from the heated solution and the recovered precipitate is dried to provide the soy protein product, or (B) the concentrated and optionally diafiltered soy protein solution from step (d) is heat treated to precipitate soy protein therefrom and either (i) the entire heated solution is dried to provide the soy protein product or (ii) the precipitated soy protein is recovered from the heated solution and the recovered precipitate is dried to provide the soy protein product, or (C) when step (e) is conducted, the dried material from step (e) is re-suspended in water, the resulting solution is adjusted to a pH of about 6 if necessary, and the re-suspended material is heat treated to precipitate soy protein therefrom and either (i) the entire heat treated material is dried to provide the soy protein product or (ii) the precipitated protein is recovered from the heated material and the recovered precipitated protein is dried to provide the soy protein product. |
