Direct and Fast Electrochemical Determination of Catechin in Tea Extracts using SWCNT-Subphthalocyanine Hybrid Material

Ahmet Şenocak, Tamara Basova, Erhan Demirbas, Mahmut Durmuş

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this study, single walled carbon nanotubes (SWCNTs) were covalently functionalized by terminal ethynyl bearing subphthalocyanine (SubPc) to obtain a new hybrid material, viz. SWCNT-SubPc (CS), via “click” reaction for the first time. The structural characterization and study of the electrochemical sensor properties of the CS hybrid material to catechin were carried out. A convenient and fast analytical method was offered for the determination of catechin. It was shown that the deposition of CS on the surface of a glassy carbon electrode (GCE) led to a 2.2 and 8-fold increase in the differential pulse voltammetry (DPV) responses to catechin in Britton-Robinson (BR) buffer solution (a pH of 3) in comparison with SWCNT-modified and bare GCE, respectively. The dynamic range, detection and quantification limits of catechin were determined to be 0.1–1.5 μM, 13 nM and 43 nM, respectively. Selectivity of the suggested CS/GCE sensor was investigated on addition of a number of interfering metal ions, antioxidants and biomolecules. The applicability of the modified electrode for the detection of catechin in real tea samples such as green, rosehip fruit, Turkish and Indian black tea was demonstrated with the standard addition method. Along with the ease in fabrication and low prices, the proposed CS/GCE sensor was reproducible, selective, stable and sensitive to catechin in major types of tea samples.

Original languageEnglish
Pages (from-to)1697-1707
Number of pages11
JournalElectroanalysis
Volume31
Issue number9
DOIs
Publication statusPublished - 1 Sep 2019

Keywords

  • Antioxidant
  • Catechin sensor
  • Click reaction
  • Subphthalocyanine
  • SWCNT
  • OXIDATION
  • BEHAVIOR
  • SENSOR
  • WALLED CARBON NANOTUBES
  • ANTIOXIDANT CAPACITY
  • FLUFENAMIC ACID
  • GREEN TEA
  • NANOPARTICLES
  • ELECTRODE
  • (+)-CATECHIN

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