Production of soluble soy protein product from soy protein micellar mass (“S300/S200”)

A process of preparing a soy protein product having a protein content of at least about 60 wt % (N×6.25) dry weight, which comprises:

• extracting a soy protein source to solubilize soy protein in the source material and to form an aqueous soy protein solution having a pH of about 5 to about 7,
• concentrating the aqueous soy protein solution to a concentration of about 50 to about 400 g/L to form a concentrated soy protein solution,
• optionally diafiltering the concentrated soy protein solution to form a concentrated and diafiltered soy protein solution,
• diluting the concentrated soy protein solution into chilled water having a temperature of less than about 15° C. to cause the formation of soy protein micelles,
• permitting the soy protein micelles to coalesce into a soy protein micellar mass,
• separating the soy protein micellar mass from the supernatant,
• acidifying the separated soy protein micellar mass to a pH of about 2.0 to about 4.0, and
• drying the separated acidified soy protein micellar mass to provide a soy protein product of at least about 60 wt % (N×6.25) d.b.