利用高温豆粕生产醇洗大豆浓缩蛋白的研究

分别以高温豆粕和低温豆粕为原料采用醇洗工艺制取大豆浓缩蛋白。测定高温豆粕和低温豆粕醇洗浓缩蛋白的蛋白质含量、NSI以及乙醇萃取液糖蜜中皂甙、异黄酮、总糖、蛋白质含量。结果显示:高温豆粕(蛋白质含量47.16%)醇洗浓缩蛋白的蛋白质含量(59.64%)虽然低于低温豆粕(蛋白质含量51.83%)醇洗浓缩蛋白的蛋白质含量(67.71%),但已接近60%,且高温豆粕乙醇萃取液糖蜜中皂甙、异黄酮含量(分别为8.04%、2.67%)与低温豆粕乙醇萃取液糖蜜中的含量接近(8.53%、2.13%)。表明利用高温豆粕生产饲用大豆浓缩蛋白应该是可行的,且副产物糖蜜是提取大豆皂甙、异黄酮、低聚糖的优质原料。

Preparation of soybean protein concentrate by alcohol leaching from high temperature soybean meal

Soybean protein concentrate was prepared by alcohol leaching from high and low temperature meal.The protein level,NSI value of the above-mentioned soybean protein concentrates,and saponin,isoflavone,total sugar,and protein level of alcohol extracted liquids molasses,were determined.The result showed,though the protein level(59.64%) of protein concentrate by alcohol leaching from high temperature meal(protein level 47.16%) was lower than the protein level(67.71%) of protein concentrate by alcohol leaching from low temperature meal(protein level 51.83%),the protein level was almost up to 60%.In addition,the saponin and isoflavone level(8.04%,2.67%,respectively) of molasses from high temperature meal was close to that(8.53%,2.13%,respectively) from low temperature meal.It was feasible to produce feed-class soybean protein concentrate from high temperature meal.Besides,the by-product molasses was a excellent raw material to produce soybean saponin,isoflavone and oligosaccharide.