TY - JOUR

T1 - Direct and Fast Electrochemical Determination of Catechin in Tea Extracts using SWCNT-Subphthalocyanine Hybrid Material

AU - Şenocak, Ahmet

AU - Basova, Tamara

AU - Demirbas, Erhan

AU - Durmuş, Mahmut

PY - 2019/9/1

Y1 - 2019/9/1

N2 - 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.

AB - 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.

KW - Antioxidant

KW - Catechin sensor

KW - Click reaction

KW - Subphthalocyanine

KW - SWCNT

KW - OXIDATION

KW - BEHAVIOR

KW - SENSOR

KW - WALLED CARBON NANOTUBES

KW - ANTIOXIDANT CAPACITY

KW - FLUFENAMIC ACID

KW - GREEN TEA

KW - NANOPARTICLES

KW - ELECTRODE

KW - (+)-CATECHIN

UR - http://www.scopus.com/inward/record.url?scp=85066460290&partnerID=8YFLogxK

U2 - 10.1002/elan.201900214

DO - 10.1002/elan.201900214

M3 - Article

AN - SCOPUS:85066460290

VL - 31

SP - 1697

EP - 1707

JO - Electroanalysis

JF - Electroanalysis

SN - 1040-0397

IS - 9

ER -