辣根过氧化物酶
生物传感器
Nafion公司
胶体金
纳米复合材料
化学
电极
电化学
检出限
试剂
电子转移
分析化学(期刊)
核化学
纳米技术
材料科学
色谱法
纳米颗粒
光化学
有机化学
酶
物理化学
作者
Yao Wang,Xinzhi Ma,Ying Wen,Yueyi Xing,Zongrang Zhang,Haifeng Yang
标识
DOI:10.1016/j.bios.2010.04.002
摘要
Gold nano-seeds (GNSs) (Ф = 2–5 nm) were dotted in TiO2 colloids and the horseradish peroxidase (HRP) was successfully immobilized on the as-made GNSs–TiO2 nanocomposite by a convenient and effective method. The matrix integrates the merits of both GNSs and TiO2, which provides a favorable microenvironment for the immobilization of HRP. The cyclic votammetric results demonstrated that the entrapped HRP achieves direct electron transfer at glassy carbon electrode (GCE). A pair of stable and quasi-reversible redox peaks with a small peak-to-peak separation of 43 mV was observed in phosphate buffer solution. The GNSs stabilized by TiO2 colloids acted sufficiently as the conducting tunnel to promote the electron transfer. As a result, the electrochemical behaviors were improved in virtue of the synergic effect of TiO2 and GNSs. The Nafion/HRP–GNSs–TiO2/GCE displayed an excellent and rapid electrocatalytic response to the reduction of H2O2. The proposed biosensor exhibited a good linear response in the range from 4.1 × 10 −5 to 6.3 × 10 −4 mol L−1, with a detection limit of 5.9 × 10−6 mol L−1 (at the ration of signal to noise, S/N = 3). The apparent Michaelis–Menten constant was estimated to be 0.63 mmol L−1. Furthermore, the biosensor possesses satisfactory stability and good reproducibility.
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