Patent ID: 8367145

Claim:
A method for producing a powdered acidic-soluble soybean protein material, which comprises: preparing a powder comprising an acidic-soluble soybean protein and a water-soluble soybean polysaccharide, wherein the acidic-soluble soybean protein has a solubility of 55% or higher at pH of 2.0 to 4.5, and wherein the value of the solubility is determined by a method which comprises, in order, the steps of: dispersing the acidic-soluble soybean protein powder in water so that a concentration of the acidic-soluble soybean protein is 5.0% by weight, adjusting the pH of the resulting solution to pH 2.0 to 4.5, subjecting the resulting solution to centrifugation at 10,000 G for 5 minutes, and determining a proportion of the resulting supernatant protein to total protein of the acidic-soluble soybean protein by a protein determination method.