采用含不同碳链长度咪唑环的烷基功能化离子液体修饰介孔材料 SBA-15,并通过 X-射线衍射、元素分析、N2吸附-脱附、红外光谱和扫描电镜等方法研究了离子液体修饰对 SBA-15结构的影响.以三乙酸甘油酯的水解为探针反应,考察了甲基、丁基、辛基等不同链长烷基取代咪唑类离子液体修饰的 SBA-15固定化 Burkholderia cepacia 脂肪酶(BCL)的酶活、最适反应条件及稳定性等酶学性质.结果表明,离子液体修饰后材料保持了原有的介孔结构,其固定化酶对温度及低 pH 的敏感度降低,比活力及稳定性均显著提高.其中甲基功能化离子液体修饰的 SBA-15固定化酶的比活力最高,是原粉 SBA-15固定化酶的2.4倍;辛基功能化离子液体修饰的 SBA-15固定化酶的热稳定性、储存稳定性、重复使用性及有机溶剂耐受性最佳.
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