Production of soluble protein solutions from soy (“S701” CIP)

A process for the preparation of a soy protein product, which comprises:

• (a) extracting a soy protein source with an aqueous calcium salt solution to cause solubilization of soy protein from the soy protein source and to form an aqueous soy protein solution,
• (b) at least partially separating the aqueous soy protein solution from residual soy protein source,
• (c) diluting said aqueous soy protein solution to a conductivity of less than about 90 mS,
• (d) adjusting the pH of the diluted aqueous soy protein solution to a pH of about 1.5 to about 4.4 to produce an acidified soy protein solution, and
• (e) drying said acidified soy protein solution to provide soy protein product.

A process for the preparation of a soy protein product, which comprises:

• (a) extracting a soy protein source with an aqueous calcium salt solution to cause solubilization of soy protein from the soy protein source and to form an aqueous soy protein solution,
• (b) at least partially separating the aqueous soy protein solution from residual soy protein source,
• (c) adjusting the pH of the aqueous soy protein solution to a pH of about 1.5 to about 4.4 to produce an acidified soy protein solution,
• (d) concentrating said acidified clear soy protein solution while maintaining the ionic strength thereof substantially constant to produce a concentrated acidified clear soy protein solution having a protein concentration of about 50 to about 300 g/L and the concentrated acidified clear soy protein solution is optionally diafiltered, and
• (e) drying the concentrated and optionally diafiltered acidified clear soy protein solution to provide the soy protein product.

A process for the preparation of a soy protein product having a protein content of at least about 60 wt % (N×6.25) d.b., which comprises:

• (a) extracting a soy protein source with an aqueous calcium salt solution to cause solubilization of soy protein from the soy protein source and to form an aqueous soy protein solution,
• (b) at least partially separating the aqueous soy protein solution from residual soy protein source,
• (c) adjusting the pH of the aqueous soy protein solution to a pH of about 1.5 to about 4.4 to produce an acidified soy protein solution,
• (d) concentrating and optionally diafiltering said acidified clear soy protein solution while maintaining the ionic strength thereof substantially constant to produce a concentrated and optionally diafiltered acidified clear soy protein solution which, when dried, provides a soy protein product having a protein concentration of at least about 60 wt % (N×6.25) d.b., and
• (e) drying and concentrated acidified clear soy protein solution to provide said soy protein product.

A process for the preparation of a soy protein product having a protein content of at least about 60 wt % (N×6.25) d.b., which comprises:

• (a) extracting a soy protein source with an aqueous calcium chloride solution having a concentration of less than about 1.0 M and a pH of about 5 to about 11 at a temperature of about 15° C. to about 60° C. to form an aqueous soy protein solution having a protein concentration of about 5 to about 50 g/L,
• (b) at least partially separating the aqueous soy protein solution from residual soy protein source,
• (c) diluting said aqueous soy protein solution to a conductivity of less than about 90 mS to provide a diluted aqueous soy protein solution,
• (d) adjusting the pH of the diluted aqueous soy protein solution to a pH of about 1.5 to about 4.4 to provide a acidified soy protein solution,
• (e) concentrating the acidified aqueous soy protein solution while maintaining the ionic strength thereof substantially constant to produce a concentrated acidified clear soy protein solution having a protein concentration of about 50 to about 300 g/L,
• (f) optionally diafiltering the concentrated acidified clear soy protein solution, wherein said concentration step and optional diafiltration are effected to provide a concentrated and optionally diafiltered acidified clear soy protein solution which, when dried provide a soy protein product having a protein concentration of at least about 60 wt % (N×6.25) d.b., and
• (g) drying the concentrated and optionally diafiltered acidified clear soy protein solution to provide the soy protein product.