The major problems such as lower recovery ratio of protein, lower yield and purity of finished products existed in the process of isolating soy protein by alkali extraction and acid precipitation.

• 大豆分离蛋白的碱浸提酸沉淀工艺，目前普遍存在蛋白质回收率低，分离蛋白成品得率低，纯度低的问题。