Reference type: Journal
Authors: Hu YF, Zhang ZH, Li JX, Zhang HB, Luo LJ, Yao SZ
Article Title: Electrochemical imprinted sensor for determination of oleanic acid based on poly (sodium 4-styrenesulfonate-co-acrylic acid)-grafted multi-walled carbon nanotubes-chitosan and cobalt hexacyanoferrate nanoparticles.
Publication date: 2012
Journal: Biosensors and Bioelectronics
Volume: 31
Issue: (1)
Page numbers: 190-196.
DOI: 10.1016/j.bios.2011.10.016
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0956566311006841

Abstract: 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
Template and target information: oleaninc acid
Author keywords: Poly (sodium 4-styrenesulfonate-co-acrylic acid)-grafted multi-walled carbon nanotubes, Imprinted electrochemical sensor, Cobalt hexacyanoferrate nanoparticles, Oleanic acid