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《Journal of Changshu Institute of Technology》 2011-08
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Direct Electrochemistry of Hemoglobin on TiO_2 Cavities Array

ZHOU Yu, ZHOU Li-juan, SUN Lei, YIN Fan (School of Chemistry and Material Engineering, Changshu Institute of Technology, Changshu 215500, China)  
The TiO2 cavities array was fabricated on indium-tin oxide electrode surface by using Langmuir-Blodgett technique and sol-gel technique. The electrochemistry property of TiO 2 cavities array was investigated. The result showed that TiO 2 cavities array had the property of microelectrode arrays. An amperometric biosensor for detection of H 2 O 2 was prepared by adsorbing hemoglobin(Hb) in TiO 2 cavities directly. In pH 7.0 phosphate buffer, the CV curve of Hb /TiO 2 cavities array electrode showed a pair of reversible redox peaks, the catholic and anodic peak appeared at 0.042 and 0.127V, its direct electron transfer rate was 2.95s-1 . The amperometric response of the biosensor possessed properties of speediness, good stability, reproducibility, and selectivity.U nder the optimal conditions, the calibration curve was linear in the range of 9.00 × 10 -7 ~ 4.44 × 10 -4 mol/L for H2O2 concentration with a detection limit of 3.12 × 10 -7 mol/L and the apparent Michaelis-Menten constant forH RP modified electrode was 0.138 mmol/L.
【Fund】: 国家自然科学基金(20975073);; 江苏省自然科学基金(BK2008147)资助项目
【CateGory Index】: Q503
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