一步电沉积制备交联型有机-无机生物杂化膜构筑双酶传感器的研究  

Construction of bienzyme biosensor based on combination of one-step electrodeposition and covalent-coupled sol-gel process

作　　者：李峰[1] 王振[1] 冯艳[1] 

机构地区：[1]生态化工教育部重点实验室,青岛科技大学化学与分子工程学院,青岛266042

出　　处：《中国科学（B辑）》2009年第7期640-645,共6页Science in China(Series B)

基　　金：国家自然科学基金项目(批准号:20775039;20775038)资助

摘　　要：利用一步电沉积法,以含有环氧基团的γ-环氧丙氧丙基三甲氧基硅烷(GPTMS)为无机杂化试剂和功能性交联试剂,通过壳聚糖(Chitosan,CS)、辣根过氧化物酶(HRP)和葡萄糖氧化酶(GOD)分子中-NH2与环氧基团的反应,在金电极表面原位制备交联型有机-无机生物杂化膜,得到共固定HRP和GOD的新型双酶生物传感器.实验证实了这种有机-无机生物杂化膜在不同酸、碱条件下都具有高的稳定性和耐用性,克服了CS酸溶的不足,从而扩大了其使用范围.在葡萄糖检测中,交联型双酶传感器HRP-GOD/GPTMS/CS/Au比无交联的双酶传感器HRP-GOD/CS/Au具有更高的灵敏度、更宽的线性范围,其线性范围为1μmol/L～351μmol/L,检测限为0.3μmol/L.Horseradish peroxidase （HRP） and glucose oxidase （GOD） bienzyme biosensor was constructed by in-situ formation of organic-inorganic biocomposite film based on one-step electrodeposition and covalent-coupled sol-gel process. The electrodeposition was performed in the solution containing functional inorganic precursor possessing epoxy group, γ-glycidoxypropyltrimethoxysiloxane （GPTMS）, a biopolymer, chitosan （CS）, and enzymes HRP and GOD. Covalent-coupled sol-gel process was formed by self-hydrolysis and self-condensation of GPTMS, and in-situ covalent cross-linking of CS, HRP, GOD through covalent reaction between amino groups and epoxy groups. The developed bienzyme biosensor presented high stability in acidic solution owing to the covalent-coupled organic-inorganic hybridization. Compared with non-hybrid HRP-GOD/CS/Au electrode, the bienzyme biosensor of HRP-GODIGPTMSICSIAu showed improved sensitivity and wider linear range for the determination of glucose. The linear response of the developed HRP-GOD/GPTMS/CS/Au biosensor for the determination of glucose ranged from 1 μmol/L to 351 μmol/L with a detection limit of 0.3 μmol/L.

关 键 词：壳聚糖 γ-环氧丙氧丙基三甲氧基硅烷 葡萄糖 生物传感器 

分 类 号：TP212.3[自动化与计算机技术—检测技术与自动化装置]