Voltammetric determination of vanillin in commercial food products using overoxidized poly(pyrrole) film-modified glassy carbon electrodes


KARABİBEROĞLU Ş., KOÇAK Ç. C.

TURKISH JOURNAL OF CHEMISTRY, vol.42, no.2, pp.291-305, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 2
  • Publication Date: 2018
  • Doi Number: 10.3906/kim-1704-21
  • Journal Name: TURKISH JOURNAL OF CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.291-305
  • Keywords: Polymer film electrode, overoxidized polymer, vanillin determination, ELECTROCHEMICAL SENSOR, CHEMICAL-STRUCTURE, ETHYL VANILLIN, POLYPYRROLE, COMPOSITE, XPS, DOPAMINE, EXTRACTS, BEHAVIOR, ACID
  • Dokuz Eylül University Affiliated: Yes

Abstract

In this work, a very simple, rapid, cheap, sensitive, and selective polymer film-modified electrode for vanillin determination in commercial food products was developed via electrochemical polymerization and overoxidation of pyrrole. The formation of both poly(pyrrole) and overoxidized poly(pyrrole) films on a glassy carbon electrode surface was characterized by electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. Under optimized conditions, the calibration graph comprises two linear segments of 0.032-1.500 mu mol L-1 and 3.00-150.00 mu mol L-1 with a detection limit of 0.012 mu mol L-1. The selectivity of the modified electrode was examined in the presence of metals, inorganic ions, and organic substances. Moreover, the proposed method was successfully used for the assessment of vanillin contents in commercial food products with satisfactory results.