食品科学 ›› 1999, Vol. 20 ›› Issue (1): 29-32.doi: 10.7506/spkx1002-6630-199901009

• 基础研究 • 上一篇    下一篇

壳聚精固定胰蛋白酶的研究

 汤亚杰, 吴思方,  程婉农   

  1. 湖北工学院生物工程系
  • 出版日期:1999-01-15 发布日期:2011-12-04

 TANG  Ya-Jie, WU  Si-Fang,   Cheng-Wan-Nong   

  • Online:1999-01-15 Published:2011-12-04

摘要: 以自制壳聚糖为载体,戊二醛为交联剂将胰蛋白酶固定化。5%戊二醛在30℃下处理载体8h,加10ml酶液(0.3mg/ml,pH7.0)固定12h以上,活力回收率达67%-75%。固定化酶的表观米氏常数(酪蛋白)k’m=22.22mg/ml,而游离酶k’m=4.17mg/ml;固定化酶最适温度为80℃,比游离酶提高了30℃;固定化最适pH值为7.5,而游离酶为8.0;固定化酶的贮存稳定性很好,二个多月重复使用,酶活力未见明显下降。

关键词:  , 壳聚糖; 固定化; 胰蛋白酶;

Abstract: Trypsin was irmobilized on chitosan and crosslinked with glutaraldehyde. The optimum conditions for immobilization were as follows: Chitosan was treated with 5% solution of qlutaraldehyde at 30℃ for 8h, then 10ml solution of trypsin (0.3mg/ml pH7. 0 ) was inunobilized on the carrier. Enzyme activity recovery was 67 %~75%. Apparent Michealis constant of ianobilized trypsln k’m=66.67mg/ml, and that of nature trypsin k’m=4.17mg/ml. The optimum temperature of immoilized trypsin was 80t℃, i. e 30℃ higher than natural trypsin 30℃. The optimum pH’s for irmobilized trypsin and natural trypsin were 7.5 and 8.0 respectively. The stability of immobilized trysin was high after storage.

Key words: Chitosan, Immobilizetion, Trypase