生物技术通报 ›› 2013, Vol. 0 ›› Issue (5): 199-204.

• 研究报告 • 上一篇    

壳聚糖修饰的PLGA纳米颗粒固定化碱性磷酸单酯酶的技术研究

高启禹1, 李宏彬2, 陈红丽1, 孔雨3, 周晨妍1   

  1. (1.河南新乡医学院生命科学技术学院 河南省遗传性疾病与分子靶向药物重点实验室培育基地,新乡 453003;2.河南新乡医学院公共卫生学院,新乡 453003;3.河南师范大学生命科学学院,新乡 453003)
  • 收稿日期:2012-12-10 修回日期:2013-05-24 出版日期:2013-05-24 发布日期:2013-05-24
  • 作者简介:高启禹,男,硕士,讲师,研究方向:酶与酶工程;E-mail:gaog345@163.com
  • 基金资助:
    河南省科技厅科技攻关项目(112102210299),河南省教育厅自然研究计划项目(2011A180026)

Study on the Technology of CS-PLGA Nanospheres Immobilized Alkaline Phosphatase

Gao Qiyu1, Li Hongbin2, Chen Hongli1, Kong Yu3, Zhou Chenyan1   

  1. (1. College of Life Science and Technology,Xinxiang Medical University,Henan Key Laboratory of Hereditary Disease and Molecular Target Drug Therapy(Cultivating Base),Xinxiang 453003;2. College of Public Health,Xinxiang Medical University,Xinxiang 453003;3. School of Life Sciences,Henan Normal University,Xinxiang 453003)
  • Received:2012-12-10 Revised:2013-05-24 Published:2013-05-24 Online:2013-05-24

摘要: 以合成的壳聚糖修饰的乳酸-羟基乙醇酸共聚物(PLGA)为材料,戊二醛为交联剂,固定了在重组大肠杆菌中表达的碱性磷酸单酯酶,并通过单因素分析及正交试验探讨了酶固定化的最优条件。结果显示,在纳米颗粒质量分数50 mg、戊二醛体积分数4%、交联时间2.0 h、固定化时间9.0 h条件下,固定化酶的酶活回收率可达76.2%,同时固定化酶反应的最适温度、最适pH值及热稳定性酸碱稳定性得到了拓宽,从而为该酶的进一步应用奠定基础。

关键词: 纳米材料, 壳聚糖-乳酸-羟基乙醇酸, 碱性磷酸单酯酶, 固定化酶

Abstract: Alkaline phosphatase expressing in recombinant E. coli was immobilized on Chitosan-poly (lactic-co-glycolic acid) by using glutaraldehyde as cross-linking reagent. The immobilization conditions and characterization of the immobilized enzyme were obtained through single factor and orthogonal experiment. The results showed that the best condition of immobilization was optimal when the CS-PLGA nanoparticles concentration was 50 mg, the volume fraction of glutaraldehyde was 4%, cross-linked time was 2.0 h and immobilized time was 9.0 h, the immobilized enzyme can keep activity about 76.2%. At the same time the optimal temperature, the optimal pH, the thermal stability and pH stability of alkaline phosphatase were comparatively improved after immobilization. So it confirmed that the technology would form basis of the further application of immobilized alkaline phosphatase.

Key words: Nanoparticle, Chitosan-poly(lactic-co-glycolic acid), Alkaline phosphatase, Immobilized enzyme