Patent ID: 7638155
Filing Date: 2009-12-29
Classification: A23J

Abstract:
1. A process for preparing a soy protein composition comprising performing an extraction on a full fat soy protein flour with a mixture of supercritical carbon dioxide and an organic solvent to produce an extracted defatted soy protein flour, wherein the organic solvent is selected from the group consisting of 1-butanol, ethanol, isopropanol, methanol, 1-propanol, and mixtures thereof, combining the extracted defaffed soy protein flour with water to form an aqueous wash solution having a pH of at least 7.0, removing solid material from the aqueous wash solution to form a supernatant, adjusting the pH of the supernatant to between about 1.0 and about 6.0 with an acid to precipitate soy protein curd, contacting the precipitated soy protein curd with a hydrating solution to form a precipitated soy protein curd suspension, contacting the precipitated soy protein curd suspension with a basic solution to raise the pH to about 6.5 to about 8.0 to form a neutralized soy protein curd suspension, and drying the neutralized soy protein curd suspension to form a defatted soy protein isolate that contains 90% or greater (by dry weight) soy protein, wherein the soy protein composition comprises less than about 0.8% (by weight dry basis) fat (by acid hydrolysis).