title: Study of kinetic parameters and development of a voltammetric sensor for the determination of butylated hydroxyanisole (BHA) in oil samples.
abstract: Electrochemical behavior of artificial antioxidant, butylated hydroxyanisole (BHA), was investigated at a glassy carbon electrode modified with poly L- cysteine [poly (L- Cys/GCE)]. BHA exhibits a pair of well - defined redox peak on L- cysteine modified GCE with Epa = 69 mV and Epc = 4 mV. The modified electrode showed good electrocatalytic activity towards the oxidation of BHA under optimal conditions and exhibited a linear response in the range from 1.0 × 10(-5) to 1.0 × 10(-6) M with a correlation coefficient of 0.998. The limit of detection was found to be 4.1 × 10(-7) M. The kinetics parameters of the proposed sensor such as heterogeneous electron transfer rate, k s , and charge transfer coefficient,α, was calculated and found to be 1.20 s(-1) and 0.575 respectively. The average surface concentration of BHA on the surface of poly (L- Cys/GCE) was calculated to be 3.18 × 10(-4) mol cm(-2). The analytical utility of the proposed sensor was evaluated by the successful determination of BHA in coconut oil and sesame oil samples.
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi-22, India.
authors.forename: Divya
authors.initials: D
authors.lastname: Thomas
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi-22, India.
authors.forename: Zafna
authors.initials: Z
authors.lastname: Rasheed
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi-22, India.
authors.forename: Jesny Siri
authors.initials: JS
authors.lastname: Jagan
authors.affiliation: Department of Applied Chemistry, Cochin University of Science and Technology, Kochi-22, India.
authors.forename: Krishnapillai Girish
authors.initials: KG
authors.lastname: Kumar
keywords: BHA; Heterogeneous electron transfer rate; L- cysteine; Sensor