Journal
BIOSENSORS & BIOELECTRONICS
Volume 31, Issue 1, Pages 190-196Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2011.10.016
Keywords
Poly (sodium 4-styrenesulfonate-co-acrylic acid)-grafted multi-walled carbon nanotubes; Imprinted electrochemical sensor; Cobalt hexacyanoferrate nanoparticles; Oleanic acid
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Funding
- Nature Science Foundation China [21005030]
- Hunan Provincial Education Department [10A099]
- Graduate Innovation Foundation of Hunan Province, China [CX2010B394]
- Twelfth Five-year-plan National Technology Support Program, China [2011BAD10B01]
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A novel sensitive and selective imprinted electrochemical sensor for the determination of oleanic acid was constructed on a carbon electrode by stepwise modification of functional multi-walled carbon nanotubes, cobalt hexacyanoferrate nanoparticles and a thin imprinted sol-gel film. The fabrication of a homogeneous porous poly (sodium 4-styrenesulfonate-co-acrylic acid)-grafted multi-walled carbon nanotubes/SiO2-chitosan nanocomposite film was conducted by controllable electrodeposition technology. The surface morphologies of the modified electrodes were characterized by scanning electron microscope. The performance of the imprinted sensor was investigated by cyclic voltammetry, square wave voltammetry and electrochemical impedance spectroscopy in detail. The imprinted sensor displayed high sensitivity and selectivity towards oleanic acid. A linear relationship between the sensor response signal and the logarithm of oleanic acid concentrations ranging from 1.0 x 10(-8) to 1.0 x 10(-3) mol L-1 was obtained with a detection limit of 2.0 x 10(-9) mol L-1. It was applied to the determination of oleanic acid in real capsule samples successfully. (C) 2011 Elsevier B.V. All rights reserved.
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