食品科学 ›› 2007, Vol. 28 ›› Issue (12): 254-257.

• 生物工程 • 上一篇    下一篇

交联β-葡萄糖苷酶聚集体的制备及其性质

 罗建平, 欧杰, 潘利华   

  1. 合肥工业大学生物与食品工程学院; 合肥工业大学生物与食品工程学院 安徽合肥230009; 安徽合肥230009;
  • 出版日期:2007-12-15 发布日期:2011-11-22

Preparation and Properties of Cross-linked β-glucosidase Aggregates

 LUO  Jian-Ping, 欧Jie , PAN  Li-Hua   

  1. School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, China
  • Online:2007-12-15 Published:2011-11-22

摘要: 交联酶聚集体法是一种新型的无载体酶固定化方法。本实验用该法固定化黑曲霉β-葡萄糖苷酶,对其制备条件、结构特征、酶学性质进行了研究。结果表明,β-葡萄糖苷酶酶液在冰水浴中经90%的硫酸铵沉淀30min后,以5%戊二醛水溶液进行酶聚集体交联反应,可获得较高活性的交联酶聚集体,酶活回收率达75%,对对-硝基苯基-β-D-葡萄糖苷作用的最适温度、最适pH值和Km值分别为60℃、pH4.0和4.61×10-3mol/L,与游离酶相比,表现更高的底物亲和力。将其用于大豆异黄酮活性苷元染料木素的合成,40min内对染料木苷转化率达到66%。

关键词: &beta, -葡萄糖苷酶, 交联酶聚集体, 无载体固定化, 大豆异黄酮, 应用

Abstract: Cross-linked enzyme aggregates (CLEAs) were used to immobilize β-glucosidase from Aspergillus niger. β-glucosidase was precipitated by 90% ammonium sulfate solution for 30 min at 0 ℃, then the aggregates were cross-linked by 5% glutaraldehyde solution. The obtained cross-linked β-glucosidase aggregates remained 75% of total enzyme activity. Its optimum reaction temperature, reaction pH and Km to pNPG were 60 ℃, 4.0 and 4.61×10-3 mol/L, respectively. Compared to the free β-glucosidase, the cross-linked β-glucosidase aggregates had higher affinity to the substrate. The conversion rate was 66% when cross-linked β-glucosidase aggregates were employed to genistein production from soybean isoflavone genistin in 40 min.

Key words: &beta, -glucosidase; cross-linked enzyme aggregates; carrier-free immobilization; soybean isoflavones; application;