食品科学 ›› 2006, Vol. 27 ›› Issue (11): 244-248.

• 工艺技术 • 上一篇    下一篇

浓缩苹果汁中蛋白质的提纯与性质研究

  李全宏, 李娜   

  1. 中国农业大学食品科学与营养工程学院
  • 出版日期:2006-11-15 发布日期:2011-11-28

Study on Isolation,Purification and Characteristic of Proteins in Concentrated Apple Juice

   Li-Quan-Hong, LI  Na   

  1. College of Food Science and Nutritional Engineering,China Agricultural University,Beijing 100083,China
  • Online:2006-11-15 Published:2011-11-28

摘要: 采用离子交换和SDS-PAGE分离纯化浓缩苹果汁中蛋白质,并对其进行性质分析。结果表明存在于浓缩苹果汁中的蛋白质组分有两种,一种是苹果本身的蛋白(蛋白Ⅰ),另一种是果汁加工中的外源酶蛋白(蛋白Ⅱ)。蛋白Ⅰ分子量很小,为25kDa,疏水性氨基酸含量高,易和酚类物质结合产生后混浊。蛋白Ⅱ分子量均大于31kDa,氨基酸组成分析发现其脯氨酸含量极少,认为其不直接参与后混浊的形成。

关键词:  , 苹果汁, 蛋白质, 分离, 纯化

Abstract: Proteins in concentrated apple juice were isolated and purified by ion-exchange chromatography and SDS-PAGE. The results showed that the proteins that existed in concentrated apple juice included two fractions,one is from mature apple fruit(protein Ⅰ),and the other one is enzyme which added into apple juice(protein Ⅱ). The molecular weight of protein Ⅰ is small,about 25kDa. The molecular weight of protein Ⅱis higher than 31kDa. Amino acid composition analytical of protein Ⅱ showed that the content of proline is low,protein Ⅱnot involved in post-haze directively.

Key words: concentrated apple juice, protein, isolation, purification