以普通定性滤纸为底物,经碱处理后,研究其对纤维素酶的亲和吸附作用.结果表明,普通定性滤纸对纤维素酶具有比较强的特异性吸附作用,能够从粗酶液中分离出纤维素酶,再经POROS 20HQ阴离子交换柱纯化后即可得到电泳纯的纤维素酶.该法大大简化了传统的纤维素酶纯化工艺,所得的纤维素酶活力极高,比活达350 U/mg以上,滤纸一步吸附后纤维素酶的纯化倍数为9.55,活性回收率在10%左右.纯化后的纤维素酶为内切β-葡聚糖酶,相对分子质量为60000,最佳pH为4.0,最佳温度为70 ℃.
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