高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (2): 210.doi: 10.7503/cjcu20180517

• 无机化学 • 上一篇    下一篇

蛋黄-壳结构Fe3O4@SiO2@PMO磁性微球的制备及对漆酶的固定化

段秉怡, 王宇, 郭宁宁, 王润伟(), 张宗弢, 裘式纶   

  1. 吉林大学化学学院, 无机合成与制备化学国家重点实验室, 长春 130012
  • 收稿日期:2018-07-24 出版日期:2019-02-10 发布日期:2018-11-05
  • 作者简介:

    联系人简介: 王润伟, 男, 博士, 教授, 主要从事新型无机复合材料研究. E-mail: rwwang@jlu.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 21771082, 21771081, 21261130584)资助

Preparation of Yolk-shell Fe3O4@SiO2@PMO Magnetic Microspheres for Laccase Immobilization

DUAN Bingyi, WANG Yu, GUO Ningning, WANG Runwei*(), ZHANG Zongtao, QIU Shilun   

  1. College of Chemistry, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China
  • Received:2018-07-24 Online:2019-02-10 Published:2018-11-05
  • Contact: WANG Runwei E-mail:rwwang@jlu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21771082, 21771081, 21261130584)

摘要:

以蛋黄-壳结构的Fe3O4@SiO2@PMO磁性微球作为载体, 采用交联法对漆酶进行固定, 考察了戊二醛浓度等对固定效果的影响, 并对固定后漆酶的活性进行了研究. 结果表明, 蛋黄-壳结构的磁性微球负载漆酶仅需6 h, 磁性微球对漆酶的固载量高达475 mg/g. 固定后漆酶的稳定性显著提高, 在pH=2.5~4.5的强酸性条件下, 固定后漆酶酶活仍可保持70%以上, 即使温度升高至60 ℃, 固定后漆酶的相对酶活仍保持65%以上. 这说明漆酶经所合成的材料固定后, 其耐酸和耐热能力都明显优于游离漆酶. 包覆的Fe3O4粒子使得材料很容易经磁铁分离法回收, 固定后漆酶经磁分离循环使用10次后仍然能保留85%的酶活, 具有良好的可操作性和稳定性, 有效降低了漆酶的使用成本.

关键词: 周期性介孔无机-有机杂化二氧化硅, 蛋黄-壳结构磁性微球, 漆酶, 固定化

Abstract:

Yolk-shell Fe3O4@SiO2@PMO magnetic microspheres were prepared and used to immobilize laccase using glutaraldehyde as the crosslinking agent. The influence of some experimental factors, such as glutaraldehyde concentration, crosslinking time and immobilization time, on laccase immobilization were investigated. The largest immobilization amount of laccase in the Fe3O4@SiO2@PMO microspheres is 475 mg/g. After immobilization, the laccase could survive in harsh environment, showing relative enzyme activities of 70% and 65% at pH=2.5—4.5 and 60 ℃, respectively. This means immobilization on Fe3O4@SiO2@PMO could afford higher stability than bare laccase. Besides, immobilized laccase could be recycled easily via simply magnetic separation, with activity retention of 85% even after 10 times recycle.

Key words: Periodic mesoporous hybrid inorganic-organic silica, Yolk-shell magnetic microspheres, Laccase, Immobilization

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