食品科学 ›› 2005, Vol. 26 ›› Issue (7): 70-73.

• 基础研究 • 上一篇    下一篇

酪蛋白组分分离技术及消化性测定

 李武祎, 郭顺堂, 俞树孝, 陆晓民   

  1. 中国农业大学食品科学与营养工程学院,兰州同健生物科技股份有限公司
  • 出版日期:2005-07-15 发布日期:2011-09-19

Study on the Separation of α-Casein and β-Casein from Yak Casein and Digestibility of the Product

 LI  Wu-Yi, GUO  Shun-Tang, YU  Shu-Xiao, LU  Xiao-Min   

  1. 1.College of Food Science and Nutritional Engineering, China Agricultural University;2.Lanzhou TonKon Biotechnologies Co. Ltd.
  • Online:2005-07-15 Published:2011-09-19

摘要: 本研究以牦牛乳干酪素为原料,分离得到纯度为74.2%的α-酪蛋白组分和纯度为75.0%的β-酪蛋白组分,其得率分别为69.5%和26.5%。通过酸凝性实验观察到在37℃,pH4.0条件下,α-酪蛋白组分形成了颗粒较大的凝块,而β-酪蛋白组分形成的是松软的絮凝物。体外消化实验结果亦显示β-酪蛋白组分的消化性要明显好于α-酪蛋白组分和牛乳酸沉酪蛋白。因而分离得到的β-酪蛋白组分可作为生产利于婴儿消化的新式配方乳粉的基料。

关键词: 干酪素, &alpha, -酪蛋白, &beta, -酪蛋白, 分离, 消化性

Abstract: In this study, an modified urea method was used to selectively separate α-casein and β-casein from yak casein.The rate of purity was 74.2% and 75.0% and the rate of yield was 69.5% and 26.5% respectively. The result of acid coagulationindicated that the large hard clots of α-casein fraction was formed together with the formation of the loose clots of β-caseinfraction at 37℃ and pH4.0. Pepsin digestibility of the casein fractions followed the order β -casein >α -casein > bovinecasein. Hence the β-casein fraction might be suitable for infant feeding formula.

Key words: casein, α-Casein, β-Casein, separation, digestion