食品科学 ›› 2011, Vol. 32 ›› Issue (9): 159-163.doi: 10.7506/spkx1002-6630-201109036

• 生物工程 • 上一篇    下一篇

固定化β-葡萄糖苷酶的酶学性质研究

汪海波,黄爱妮,张含俊,刘良忠   

  1. 武汉工业学院食品科学与工程学院
  • 出版日期:2011-05-15 发布日期:2011-04-11
  • 基金资助:
    武汉市青年科技晨光计划项目(200750731286)

Enzymatic Properties of Immobilized β-Glucosidase

WANG Hai-bo,HUANG Ai-ni,ZHANG Han-jun,LIU Liang-zhong   

  1. School of Food Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China
  • Online:2011-05-15 Published:2011-04-11

摘要: 采用海藻酸钠-壳聚糖包埋的方法制备固定化β-葡萄糖苷酶,通过测定酶的最适水解pH值、最适水解温度、耐酸碱性、热稳定性、储存稳定性和重复使用性,研究β-葡萄糖苷酶在固定化前后酶学性质的变化。在此基础上,进一步考察干燥和复水处理对固定化酶活力的影响以及添加剂用量对固定化酶颗粒硬度的影响。结果表明:游离β-葡萄糖苷酶经海藻酸钠-壳聚糖包埋固定化后,其最适水解pH值基本不变,但固定化酶的最适水解温度范围、耐酸碱性、热稳定性和储存稳定性与游离酶相比均有不同程度的提高;采用该方法制备的固定化酶在重复使用8次之后其相对酶活力仍大于50%;固定化酶经干燥处理后酶活力下降明显,但经复水处理后酶活力可以得到部分恢复,干燥和复水处理对固定化酶活性有比较显著的影响;在固定化酶制备过程中,氯化钙质量分数为2%时所得固定化酶小球颗粒硬度达到最大,增加海藻酸钠和壳聚糖质量分数可有效提高固定化酶小球颗粒的硬度。

关键词: β-葡萄糖苷酶, 固定化, 性质

Abstract: A sodium alginate-chitosan entrapment method was employed to prepare immobilized β-glucosidase and the enzymatic properties of immobilized β-glucosidase and free β-glucosidase were analyzed and compared. The results showed that the optimal reaction pH of immobilized β-glucosidase was almost the same as that of its free counterpart, but immobilizedβ-glucosidase had a wider range of optimal reaction temperature and better pH resistance, thermostability and storage stability. Immobilized β-glucosidase retained more than 50% activity after eighth repeated use. Immobilized β-glucosidase showed a marked loss of activity after dehydration. In contrast, rehydration could restore partial enzyme activity. The immobilized β-glucosidase beads obtained under 2% CaCl2 concentration displayed the highest rigidity. Increasing the concentrations of sodium alginate and chitosan could effectively improve the rigidity of immobilized β-glucosidase beads.

Key words: β-glucosidas, immobilization, enzymatic properties

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