Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 222, Issue -, Pages 391-396Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.08.084
Keywords
Molecularly imprinted polypyrrole; Electrochemical sensor; Chlorogenic acid; Electropolymerization
Funding
- graduate research scholarship office, University of Brunei Darussalam (UBD)
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A sensor was fabricated by modifying pencil graphite electrodes with molecularly imprinted polypyrrole (MIPpy) synthesized by electropolymerization of pyrrole monomer at constant potential in the presence of chlorogenic acid (CGA). A comparison between the non-imprinted modified pencil graphite electrode and the molecularly imprinted pencil graphite electrode is reported. Several important parameters controlling the performance of the polypyrrole and the method efficiencies were investigated and optimized. Surface morphology of imprinted and non-imprinted sensor was characterized by scanning electron microscope (SEM) and atomic force microscope (AFM). The molecularly imprinted layer exhibited selectivity and sensitivity toward CGA. Under optimized conditions, the calibration curve demonstrated linearity over a concentration range of 1 x 10(-2) mol/L to 1 x 10(-6) mol/L with a correlation coefficient (R-2) of 0.993 and has life span of more than 3 months without any considerable change in the measured response. The sensor exhibited a sensitivity of -54.7 mV per decade. As an application, this potentiometric sensor has been successfully applied to the determination of CGA content in four different coffee samples and compared with HPLC results. (C) 2015 Elsevier B.V. All rights reserved.
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