Potentiometric cholesterol biosensor based on ZnO nanorods chemically grown on Ag wire

• DOI: 10.1016/j.tsf.2010.08.052
• Publication Date: 2010-08-21T09:21:10Z
• Authors: M.Q. Israr; J.R. Sadaf; M.H. Asif; O. Nur; M. Willander; B. Danielsson
• Keywords: Nanorod; Cholesterol Oxidase

An electrochemical biosensor based on ZnO nanorods for potentiometric cholesterol determination is proposed. Hexagon-shaped ZnO nanorods were directly grown on a silver wire having a diameter of 250 mu m using low temperature aqueous chemical approach that produced ZnO nanorods with a diameter of 125250 nm and a length of similar to 1 mu m. Cholesterol oxidase (ChOx) was immobilized by a physical adsorption method onto ZnO nanorods. The electrochemical response of the ChOx/ZnO/Ag biosensor against a standard reference electrode (Ag/AgCl) was investigated as a logarithmic function of the cholesterol concentration (1 x 10(-6)M to 1 x 10(-2)M) showing good linearity with a sensitivity of 35.2 mV per decade and the stable output signal was attained at around 10 s. (C) 2010 Elsevier BM. All rights reserved. (Less)