Amperometric nitrite sensor based on hemoglobin/colloidal gold nanoparticles immobilized on a glassy carbon electrode by a titania sol-gel film

被引:67
作者
Yang, WW [1 ]
Bai, Y [1 ]
Li, YC [1 ]
Sun, CQ [1 ]
机构
[1] Jilin Univ, Coll Chem, Changchun 130023, Peoples R China
基金
中国国家自然科学基金;
关键词
titania sol-gel; sensor; nitrite; hemoglobin; electrocatalysis;
D O I
10.1007/s00216-005-3160-1
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
A novel amperometric nitrite sensor was developed based on the immobilization of hemoglobin/colloidal gold nanoparticles on a glassy carbon electrode by a titania sol-gel film. The sensor shows a pair of well-defined and nearly reversible cyclic voltammogram peaks for Hb Fe(III)/Fe(II) with a formal potential (E degrees') of -0.370 V, and the peak-to-peak separation at 100 mV s(-1) was 66 mV vs. Ag/AgCl (3.0 M KCl) in a pH 6.9 phosphate buffer solution. The formal potential of the Hb Fe(III)/Fe(II) couple shifted linearly with pH with a slope of -50.0 mV/pH, indicating that electron transfer accompanies single-proton transportation. The sensor exhibited an excellent electrocatalytic response to the reduction of nitrite. The reduction overpotential was 0.45 V below that obtained at a colloidal gold nanoparticles/TiO2 sol-gel film-modified GCE. The linear range for nitrite determination for the sensor was 4.0 x 10(-6) to 3.5 x 10(-4) M, with a detection limit of 1.2 x 10(-6) M. The stability, repeatability and selectivity of the sensor were also evaluated.
引用
收藏
页码:44 / 50
页数:7
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