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Citation: ZHENG Yan-Qiong, YANG Chang-Zhu, ZHANG Jing-Dong, MUNETAKA Oyama, PU Wen-Hong, LONG Feng. A Tryptophan Sensor Based on Carbon Nanotubes[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1433-1438. shu

A Tryptophan Sensor Based on Carbon Nanotubes

1.
a College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074;
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b Division of Research Initiatives, International Innovation Center, Kyoto University, Kyoto, Japan

Corresponding author: YANG Chang-Zhu,
Received Date: 27 December 2006
Available Online: 15 June 2007

Electrochemical behavior of tryptophan at MWNTs modified glassy carbon electrode(MWNTs/GC) was studied.It was demonstrated that MWNTs/GC electrode could effectively catalyze Trp oxidation,where the anodic peak potential shifted to negative by 128 mV,and the oxidation peak current greatly increased to 32 times that of glassy carbon electrode.Scanned in 1.0 mol/L H₂SO₄,the electrodes can be renovated to eliminate the influence of oxidation product adsorbed on the electrode surface.The current of the MWNTs/GC electrode was stabilized by closed-circuit way in the buffer solution(pH=2.2) including 1.0×10^-4 mol/L Trp in 2 min.The effects of pH on the potential and the current were studied,which revealed that equal number of protons and electrons were involved in the oxidation process,and the current reached the maximum at pH=2.2.The linear relationship between the current and the scan rate revealed that the electrode process was surface-controlled.In the environment below 45℃, the current increased gradually with increasing temperature.In the range of 16 to 35℃,linear dependence of the current on the temperature was observed with a temperature coefficient of 0.695 μA/℃,which indicated that the detection result was weakly interfered by the temperature of the surroundings.The relationship between the current and the concentration was studied by LSV.The peak current was linearly proportional to the concentration of Trp in the range of 1.00×10^-6 mol/L to 1.00×10^-4 mol/L.The detection limit was 1.82×10^-7 mol/L(S/N=3).The MWNTs/GC electrode showed good sensitivity,selectivity and stability.After exposure in atmosphere for 7 days,the oxidation current of Trp at MWNTs/GC electrode still retained 98% of the original value.
- tryptophan sensor,
- MWNTs,
- modified electrode
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