Extraction of Soybean Protein with Alkaline Method Assisted by Ultrasound

Using hypothermic degreased soybean meal as raw materials,soy protein was extracted with aikaline and precipitated with acerbity assisted by ultrasound.The influence of temperature,pH,extraction time,water-to-flour ratio and extraction power on the production of soy protein were studied as the extraction rate of soy protein was considered.Optimum extraction conditions of soy protein through processing optimization with orthogonal experiment and confirmative experiment were extraction temperature of 40℃,pH of 11,extraction time of 40 min,water-to-flour ratio of 30:1(mL /g),ultrasonic power of 400 W.Under these conditions,the extraction rate of soy protein reached 83.41%.