摘要
将纳米金吸附辣根过氧化物酶(HRP)固定在多壁碳纳米管(MWNT)修饰的铂(Pt)电极上,利用MWNT对HRP的直接电化学催化特性及纳米金对蛋白质的强吸附能力制备了第3代H2O2生物传感器。实验结果表明,HRP在MWNT/Pt电极表面能进行有效和稳定的直接电子转移,HRP保持了其对H2O2还原的生物电催化活性,而且能快速(3S)地响应H2O2浓度的变化。HRP在修饰电极上的表观吸附量(Tr)为7.3×10^-10mol/cm^2,异相电子转移常数(Ks)为1.23s^-1。该传感器在-300mV时对H2O2响应的线性范瑚为1×10^-5~1×10^-3 mol/L(r=0.9968,n=4)。
The third generation H202 sensor was developed based on immobilizing horseradish peroxidase(HRP) on a muhi-walled carbon nanotubes(MWNT) modified Pt electrode by electrostatic adsorption of nano-Au for HRP. The experimental results demonstrated that HRP could process the direct electron transfer effectively on the electrode surface. The HRP displayed an excellent electrocatalytic response to the reduction of H2O2. The average surface coverage (FT) of HRP on the modified electrode was 7.3×10^-10·mol/cm^2. The apparent heterogeneous electron transfer rate constant k, was l. 23 s^-1. The biosensor could rapidly respond(3 s) to the change of the concentration of H2O2 in the range 1×l0^-5~1×10^-3 mol/L(r=0. 996 8, n=4).
出处
《分析测试学报》
CAS
CSCD
北大核心
2008年第10期1099-1102,共4页
Journal of Instrumental Analysis
基金
国家地质调查项目(200314200015)
关键词
第3代生物传感器
多壁碳纳米管
辣根过氧化物酶
纳米金
the third generation biosensor
multi-walled carbon nanotube
horseradish peroxidase
nano-Au
作者简介
许淑霞(1977-),女(蒙古族),新疆昌吉人,讲师,博士研究生,Tel:028-84079237,E-mail:xushux@cdut.edu.cn