Patent ID: 6335043
Filing Date: 2002-01-01
Classification: A23J

Abstract:
A method of extracting proteins from soybean, comprising the steps of:a. preparing a fat-free soybean meal which comprises water soluble and water insoluble proteins; b. introducing water to said fat-free soybean meal to produce a soybean meal suspension, said soybean meal suspension comprising a first liquid phase and a first solid phase, said water soluble proteins staying in said first liquid phase and said water insoluble proteins staying in said first solid phase; c. separating said first liquid phase and said first solid phase; d. introducing water to said separated first solid phase to form a second suspension, said second suspension comprising a second liquid phase and a second solid phase, said water insoluble proteins staying in said second solid phase; e. introducing a protease to said second suspension so as to digest said water insoluble proteins therein such that said water insoluble proteins become additional water soluble proteins staying in said second liquid phase; f. separating said second liquid phase and said second solid phase; g. adding an acid to said first or said second liquid phases or the combination thereof to produce protein precipitates; and f. collecting said protein precipitates.