以壳聚糖(CS)膜为载体,通过PPO与CS-Cu膜上的Cu2+鳌合,制备固定化PPO的CS-Cu酶膜.响应面法研究了酶膜在固定化过程中的Cu2+螯合量(QCu2+)、PPO浓度(CE)、pH三因素对固定化PPO的活力的影响,分别测定了溶液PPO和酶膜上固定化PPO的酶活性,并对CS-Cu-PPO膜的特性作了初步讨论.结果表明,PPO固定化的最优条件是:温度40℃,pH 7.67,QCu2+ 30.07mg/mL,CE2.12 mg/mL;酶膜中固定化PPO的米氏常数及其相对活力都比溶液PPO的大,半衰期约30 d,酶膜重复使用8次后的PPO活力降至79％.研究结果为开发特定功能的EMR提供了重要的基础.
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