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二茂铁功能化Fe_3O_4/碳纳米管/壳聚糖复合膜葡萄糖生物传感电极的研究 被引量:2

Design and Development of A Novel Glucose Biosensor Based on the Ferrocene-Functionalized Fe_3O_4 Nanoparticles/Carbon Nanotubes/Chitosan Nanocomposite Film Modified Electrode
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摘要 采用交联法制备了羧基二茂铁功能化Fe3O4纳米粒子(FMC.AFNPs)复合材料,并将该复合纳米材料与多壁碳纳米管(MWNTs)、壳聚糖(CS)及葡萄糖氧化酶(GOD)混合修饰于自制的磁性玻碳基底0WGC)表面。制备了GOD/FMC-AFNPs/MWNTs/CS复合膜生物传感器电极.实验结果表明,FMC.AFNPs复合材料有效地克服了二茂铁在电极表面的泄漏,且FMC.AFNPs/MWNTs/CS复合膜良好的生物兼容性较大地改善了固定化GOD的生物活性.MWNTs具有良好的导电性和大比表面积,在修饰膜内可作为电子传递“导线”,极大地促进电极的电子传递速率,提高电极的电催化活性和灵敏度.该电极的葡萄糖检测的线性范围为1.0x10^-5~6.0x10^-3mol·L^-1,检测限为3.2×10^-6mmol·L^-1(S/N=3),表观米氏常数为5.03·10^-3mmol·L^-1,且有较好的稳定性和重现性. A novel platform for the fabrication of glucose biosensor was successfully constructed by entrapping glucose oxidase (GOD) in a ferrocene monocarboxylic acid-aminated Fe304 magnetic nanoparticles conjugate (FMC-AFNPs)/chitosan (CS) /multiwall carbon nanotubes (MWNTs) nanocomposite. The formation of FMC-AFNPs could effectively prevent the leakage of ferrocene and retain its electrochemical activity. This GOD/FMC-AFNPs/CS/MWNTs matrix provided a biocompatible microenvironment for retaining the native activity of the immobilized GOD. Moreover, the presence of MWNTs enhanced the charge-transport properties of the composite and facilitated electron transfer between the GOD and the electrode for the electrocatalysis of glucose. Under the optimal conditions the designed biosensor to glucose exhibited a wide and useful linear range app of 1.0xl0-5 to 6.0x10^-3 mol.L^-1 with a low detection limit of 3.2x10^-6 mol.L^-1(S/N=3). The value of KM was 5.03x10^-3 mol·L^-1, indicating that the biosensor possesses higher biological affinity to glucose. Furthermore, the biosensor possesses satisfactory stability and good reproducibility.
出处 《电化学》 CAS CSCD 北大核心 2014年第1期33-38,共6页 Journal of Electrochemistry
基金 国家863计划资助项目(No.2012AA022604) 国家自然科学基金(No.20975021 No.21275028) 福建省高校产学研科技重点项目(No.2010Y4003) 福建省自然科学基金资助项目(No.2010J06011) 福建医科大学博士启动基金(No.2011BS005)资助
关键词 二茂铁修饰Fe3O4 碳纳米管 壳聚糖 葡萄糖氧化酶 生物传感器 ferrocene-modified Fe304 nanoparticles carbon nanotubes chitosan glucose oxidase biosensor
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