Electrochemical Studies of Carbon Nanotube Obtained from Coconut Oil as Non Enzymatic Glucose Biosensor

Abstract

The electrochemical analysis of glucose with high selectivity and sensitivity without using enzymes is one of the dream that many researchers have been trying to make come true. In this paper, a low cost carbon nanotubes (CCNTs) based electrode was designed for electrochemical biosensing of glucose. CCNTs have been prepared by burning coconut oil under insufficient air which was then purified, functionalized and then characterized by SEM and p-XRD. The electrode was successfully employed as non enzymatic sensor for glucose in acidic medium, and the glucose quantification was carried out by means of cyclic voltammetry. The resulting non enzymatic biosensor exhibits a good response performance to glucose detection with a wide linear range from 10 −2 to 10 −6 M glucose with correlation coefficient (R 2 = 0.99657). The biosensor shows a short response time of 6 s, lower detection limit of 1 � M. The results demonstrated that the CCNTs-modified electrode exhibited excellent sensitivity and selectivity for the detection of glucose and outperformed similar to screen printed standard carbon nanotube electrode (std-CNT) in terms of linearity and response time.