Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (1): 78.doi: 10.7503/cjcu20190485

• Analytical Chemistry • Previous Articles     Next Articles

Preparation of HRP Molecularly Imprinted Electrochemical Sensor with Multi-walled Carbon Nanotubes as Sensitizing Materials and the Detection of H2O2

TENG Yu,YANG Shaoming(),BAI Chaopeng,ZHANG Jian   

  1. School of Material Science and Engineering, East China Jiaotong University, Nanchang 330013, China
  • Received:2019-09-10 Online:2020-01-10 Published:2019-10-29
  • Contact: Shaoming YANG E-mail:yangsm79@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21465012)

Abstract:

Firstly, the pre-carboxylated multi-walled carbon nanotubes(MWCNTs) were electrodeposited on the surface of the glassy carbon electrode as sensitivity-enhanced materials. Then, a layer of polymeric film was formed on the modified electrode through the electropolymerization in the o-phenylenediamine(o-PD) monomer solution containing horseradish peroxidase template molecule. After removing the templates, the molecularly imprinted polymer membrane with specific recognition ability towards horseradish peroxidase was formed. The prepared molecularly imprinted electrochemical sensor had a good linear relationship with horseradish peroxidase(HRP) in the concentration range of 1.0×10 -10—1.0×10 -5 mg/mL, the correlation coefficient was 0.991, and the detection limit was 1.5×10 -11 mg/mL(S/N=3); and also exhibited a good linear response for H2O2 in the concentration range of 4.0×10 -7—1.4×10 -5 mol/L, with a correlation coefficient of 0.992 and a detection limit of 2.6×10 -7 mol/L(S/N=3). And this molecularly imprinted sensor was used for the detection of the actual sample, the recovery rate is between 91.2% and 97.1%. HRP and H2O2 bi-analyte sensor based on MIP film was successfully developed in this work. The developed method can also be applicable for enzyme and its enzymatic substrate bi-analyte sensor.

Key words: Molecularly imprinted polymer, Self-probe, Molecularly imprinted electrochemical enzyme sensor, Horseradish peroxidase, Hydrogen peroxide

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