Sensitive and reliable electrochemical detection of nitrite and H2O2 embellish-CoPc coupled with appliance of composite MWCNTs

Mounesh; K R Venugopala Reddy

doi:10.1016/j.aca.2020.02.057

Sensitive and reliable electrochemical detection of nitrite and H₂O₂ embellish-CoPc coupled with appliance of composite MWCNTs

Anal Chim Acta. 2020 Apr 29:1108:98-107. doi: 10.1016/j.aca.2020.02.057. Epub 2020 Feb 28.

Authors

Mounesh¹, K R Venugopala Reddy²

Affiliations

¹ Department of Chemistry, Vijayanagara Shrikrishnadevaraya University Ballari, 583105, Karnataka, India.
² Department of Chemistry, Vijayanagara Shrikrishnadevaraya University Ballari, 583105, Karnataka, India. Electronic address: venurashmi30@gmail.com.

PMID: 32222249
DOI: 10.1016/j.aca.2020.02.057

Abstract

The electrocatalytic properties of tetra L-Methionine cobalt (II) phthalocyanine (CoTL-MethPc) and functionalized MWCNTs, decorated on glassy carbon electrode (GCE) was investigated. The synthesis of the CoTL-MethPc was confirmed using UV-Vis, FT-IR, XRD, TGA and MASS techniques. Successful modification of GCE with the CoTL-MethPc and their composite was also confirmed using cyclic voltammetry (CVs), differential pulse voltammetry (DPV) and chrono-amperometry (CA) techniques. CoTL-MethPc/MWCNTs/GCE was the best electrode towards nitrite and hydrogen peroxide (H₂O₂) detection with a very low detection limit (30 and 10 nmol L^-1) by CVs method, which compared favorably with literature, good sensitivity, electrocatalytic oxidation of nitrite and hydrogen peroxide on CoTL-MethPc/MWCNTs/GCE electrode was diffusion controlled but characterized with some adsorption of electro-oxidation-reduction reaction intermediates products. The fabricated sensors are easy to prepare, cost-effective and can be applied for real sample analysis of nitrite in beetroot vegetable. The excellent electrocatalytic property of CoTL-MethPc/MWCNTs is high reproducibility, repeatability, selectivity.

Keywords: Amperometry; CoTL-MethPc; Hydrogen peroxide; Nanomolar; Nitrite; Sensitivity.

MeSH terms

Beta vulgaris / chemistry
Cobalt / chemistry
Coordination Complexes / chemical synthesis
Coordination Complexes / chemistry*
Electrochemical Techniques / instrumentation
Electrochemical Techniques / methods
Electrodes
Hydrogen Peroxide / analysis*
Hydrogen Peroxide / chemistry
Indoles / chemical synthesis
Indoles / chemistry
Isoindoles
Limit of Detection
Methionine / analogs & derivatives
Methionine / chemical synthesis
Nanotubes, Carbon / chemistry*
Nitrites / analysis*
Nitrites / chemistry
Oxidation-Reduction
Reproducibility of Results

Substances

Coordination Complexes
Indoles
Isoindoles
Nanotubes, Carbon
Nitrites
Cobalt
Methionine
Hydrogen Peroxide
phthalocyanine