title: Use of array of conducting polymers for differentiation of coconut oil products.
abstract: An array of chemiresistors based on conducting polymers was assembled for the differentiation of coconut oil products. The chemiresistor sensors were fabricated through the potentiostatic electrodeposition of polyaniline (PANi), polypyrrole (PPy) and poly(3-methylthiophene) (P-3MTp) on the gap separating two planar gold electrodes set on a Teflon substrate. The change in electrical resistance of the sensors was measured and observed after exposing the array to the headspace of oil samples. The sensor response was found rapid, reversible and reproducible. Different signals were obtained for each coconut oil sample and pattern recognition techniques were employed for the analysis of the data. The developed system was able to distinguish virgin coconut oil (VCO) from refined, bleached & deodorised coconut oil (RBDCO), flavoured VCO, homemade VCO, and rancid VCO.
authors.affiliation: The Graduate School, University of Santo Tomas, España Blvd., Manila 1015, Philippines. Electronic address: ragranola@yahoo.com.
authors.forename: Rey Alfred G
authors.initials: RA
authors.lastname: Rañola
authors.affiliation: Research Center for Natural and Applied Sciences, University of Santo Tomas, España Blvd., Manila 1015, Philippines.
authors.forename: Karen S
authors.initials: KS
authors.lastname: Santiago
authors.affiliation: The Graduate School, University of Santo Tomas, España Blvd., Manila 1015, Philippines; Research Center for Natural and Applied Sciences, University of Santo Tomas, España Blvd., Manila 1015, Philippines.
authors.forename: Fortunato B
authors.initials: FB
authors.lastname: Sevilla
mesh_terms: D016000:Cluster Analysis; D000074263:Coconut Oil; D004553:Electric Conductivity; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation*; D004595:Electroplating; D063427:Food Quality; D010938:Plant Oils / Q000032:analysis* / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011138:Polytetrafluoroethylene / Q000737:chemistry; D025341:Principal Component Analysis; D014835:Volatilization
chemical_list: D010938:Plant Oils; D011108:Polymers; D011138:Polytetrafluoroethylene; D000074263:Coconut Oil
keywords: Chemiresistor; Chemometrics; Coconut oil; Conducting polymers; Electronic nose