Álvaro Arrieta ¹, Manuel Palencia ², Reinaldo Pestana ³

Affiliations
1 Departamento de Biología y Química, Universidad de Sucre, Cra 28 # 5-267 Barrio Puerta Roja, Sincelejo, CO
2 Departamento de Química, Facultad de Ciencias Naturales y Exactas, Universidad Del Valle, Cali-Colombia
3 Departamento de Química, Facultad de Ciencias Naturales, Universidad de Córdoba, Montería-Colombia

Abstract

Objectives: To use of cassava (Manihot esculenta Crantz) starch to prepare a new composite biopolymer from starch and poly (3,4-ethylenedioxythiophene) starch/PEDOT with conducting properties and redox activity. Methods/Analysis: The synthesis of the composite biopolymer starch/PEDOT was carried out by thermochemical process. Its electrochemical properties were studied by means of cyclic voltammetry and the structural characteristics were determined with infrared spectroscopy. Findings: The results showed excellent redox behavior of the composite biopolymer starch/PEDOT, with oxidation and reduction of the polymer at 0.38 V and - 0.43 V potential, respectively. In addition, the kinetic of the composite biopolymer films shows to be faster and more sensitive response that the pure starch and pure PEDOT films. Moreover, a study was conducted with infrared spectroscopy to determine possible interactions or structural changes in the polymer chains of starch when combined with PEDOT. The results of these studies showed that there is an interaction between the molecules of both polymers and an improvement in the conductivity of the starch polymer. Novelty/Improvement: In this way, a composite conductive biopolymer stable from cassava starch and PEDOT was obtained, which has excellent electrochemical properties, which makes it a material with technological potential in chemical sensor or charge storage.

Keywords

Composite Biopolymer, Conducting Polymer, Cassava Starch, Electrochemistry, Poly (3, 4-etilendioxitiofeno)

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Alvaro Arrieta ¹, Oscar Fuentes ², Manuel Palencia ³

Affiliations
1 Department of Biology and Chemistry, University of Sucre, Carrera Barrio Puerta Roja, Sincelejo, CO
2 DANM Laboratory, Pontifical Bolivarian University-Monteria, Research Department– IGELSAC; Calle La Castellana, IGELSAC, Monteria, CO
3 Department of Chemistry, University of Valle, Calle, Universidad del Valle, Cali, CO

Abstract

Objectives: The aim of this work is shows the elaboration of a device based on PSOC technology called electronic tongue, which is able to separate samples of raw milk. Methods/Statistical Analysis: The device developed consists of an electrochemical sensor array based on conductive polymers, a multi-channel system of electrochemical measurements, responsible for acquire and processing signals from substances trough sensors, and a data processing stage capable to discriminate different substances with multivariate statistical methods. Findings: The results show how this system was capable of offering unique signal front for each different samples of milk, the data obtained were discriminated by data processing stage thanks to the use of a multivariate statistical method called Principal Components Analysis. This work has been focused on the dairy sector, with the purpose to provide a device capable to make inspection of the raw milk in field. Application/Improvements: The device elaborated in our laboratory is compact and portable (347 g). The signals registered with the sensor array of the electronic tongue allowed to discriminate adulterated milk samples.

Keywords

Electronic Tongue, Electrochemical Sensors Array, PSOC Technology, Milk

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