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新型磁性纳米材料对胰蛋白酶的固定化 被引量:4

Noval magnetic nanoparticles for trypsin immobilization
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摘要 通过静电的相互作用,将胰蛋白酶成功地固定于羧甲基壳聚糖磁性纳米颗粒(Fe3O4(PEG+CM-CTS))的表面,研究了固定化过程中的p H值、胰蛋白酶初始质量浓度和固定化时间对胰蛋白酶固载量和相对酶活的影响.研究结果表明:Fe3O4(PEG+CM-CTS)纳米颗粒对胰蛋白酶的吸附符合Langmuir等温吸附模型,且载体对胰蛋白酶的最大固载量为117.6 mg·g-1,相对酶活性为87.9%.此外,固定化胰蛋白酶的稳定性试验表明:固定化胰蛋白酶在持续的BSA水解过程中,具有良好的操作稳定性以及较高的储藏稳定性. The trypsin was successfully immobilized on the surface of magnetic carboxymethyl chitosan( Fe3O4( PEG + CM-CTS)) nanoparticles by electrostatic interaction. The effects of the medium p H,the concentration of trypsin and the immobilization time on trypsin loading and relative activity onto the magnetic nanoparticles were discussed. The results show that the adsorption equilibrium of trypsin onto the Fe3O4( PEG + CM-CTS) magnetic nanoparticles well fits Langmuir model,and the maximum trypsin loading is 117. 6 mg·g-1with relative trypsin activity of 87. 9 %. The stability experiments indicate that the immobilized trypsin has good operational stability for the continuous hydrolysis of BSA solution with improved storage stability.
出处 《江苏大学学报(自然科学版)》 EI CAS CSCD 北大核心 2015年第3期343-347,共5页 Journal of Jiangsu University:Natural Science Edition
基金 中国博士后科学基金资助项目(2013M531288) 江苏省自然科学基金青年基金资助项目(BK20130491) 江苏省高校自然科学基金资助项目(13KJB550005) 江苏大学高级专业人才科研启动基金资助项目(12JDG077)
关键词 磁性纳米颗粒 羧甲基壳聚糖 胰蛋白酶 酶固定化 水解 magnetic nanoparticles carboxymethyl chitosan trypsin enzyme immobilization hydrolysis
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