Patent No. 601339 Disclosed is a process of preparing a soy protein product having a protein content of at least 60 wt% (N x 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 5 to 7, concentrating the aqueous soy protein solution to a concentration of 50 to 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, acidifying the concentrated and optionally diafiltrated soy protein solution to a pH of 2.0 to 4.0, and drying the acidified soy protein solution to provide the soy protein product, or diluting the concentrated soy protein solution into chilled water having a temperature of less than 15°C to cause 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 protein solution isolate to a pH of 2.0 to 4.0, and drying the separated soy protein micellar mass to provide a soy protein product.
