超滤法生产大豆浓缩蛋白

Concentrated Soy Protein by Ultrafiltration

采用商业聚砜平板膜生产大豆浓缩蛋白。脱脂豆粕和水按一定比例混合 ,pH8 0室温下搅拌 40min ,离心 ,上清液经超滤、冷冻干燥 ,得到大豆浓缩蛋白。蛋白质含量由 5 2 % (干基 )提高到 72 % (干基 )。蛋白质的回收率达到 90 %以上。根据浓差极化模型得到间歇式超滤浓缩蛋白质时的理论极限蛋白质含量。

Soy protein concentrates were produced by ultra-filtration with a commercial polyethersulfone plate module. The defatted soy flour ws mixed with certain amount of water, and agitated at pH 8.0 and ambient temperature for 40 minutes. After centrifuge, the supernatant was ultra filtrated, the soy protein concentrates were dried and obtained by freezing. By this method, the protein content increased from 52%(dry basis) to 72% (dry basis) and the protein yields were more than 90% then previous. The theoretic maximum protein content of soy protein by ultra-filtration in batch operation was obtained based on the theory of concentration polarization.