Fabrication of copper nanoparticles decorated multiwalled carbon nanotubes as a high performance electrochemical sensor for the detection of neotame

Ayyappa Bathinapatla; Suvardhan Kanchi; Parvesh Singh; Myalowenkosi I Sabela; Krishna Bisetty

doi:10.1016/j.bios.2014.08.017

Fabrication of copper nanoparticles decorated multiwalled carbon nanotubes as a high performance electrochemical sensor for the detection of neotame

Biosens Bioelectron. 2015 May 15:67:200-7. doi: 10.1016/j.bios.2014.08.017. Epub 2014 Aug 19.

Authors

Ayyappa Bathinapatla¹, Suvardhan Kanchi², Parvesh Singh³, Myalowenkosi I Sabela¹, Krishna Bisetty⁴

Affiliations

¹ Department of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
² Department of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa. Electronic address: ksuvardhan@gmail.com.
³ School of Chemistry and Physics, University of KwaZulu Natal, Westville, Private Bag X54001, Durban 4000, South Africa.
⁴ Department of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa. Electronic address: bisettyk@dut.ac.za.

PMID: 25216979
DOI: 10.1016/j.bios.2014.08.017

Abstract

A highly sensitive and novel electrochemical sensor for the detection of neotame using differential pulse voltammetry with a modified glassy carbon electrode is presented. The method was further customized by the fabrication of the electrode surface with copper nanoparticles-ammonium piperidine dithiocarbamate-mutiwalled carbon nanotubes assimilated with β-cyclodextrin. The multiwalled carbon nanotubes assimilated with β-cyclodextrin/glassy carbon electrode exhibited catalytic activity towards the oxidation of neotame at a potential of 1.3 V at pH 3.0. The transmission electron microscopy, thermogravimetric analysis, frontier transform infrared spectroscopy and cyclic voltammetry were employed to characterize the electrochemical sensor. The sensitivity and detection limits of the electrode increased two-fold in contrast to the β-CD-MWCNTs/GCE sensor. The developed method was successfully applied for the determination of neotame in food samples, with results similar to those achieved by our modified capillary electrophoresis method with a 96% confidence level.

Keywords: Cyclic voltammetry; Differential pulse voltammetry; Electrochemical sensor; Neotame.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Conductometry / instrumentation*
Copper / chemistry*
Dipeptides / analysis*
Electrodes
Food Additives / analysis
Food Analysis / instrumentation*
Metal Nanoparticles / chemistry*
Metal Nanoparticles / ultrastructure
Nanotubes, Carbon / chemistry*
Nanotubes, Carbon / ultrastructure
Reproducibility of Results
Sensitivity and Specificity
Sweetening Agents / analysis

Substances

Dipeptides
Food Additives
Nanotubes, Carbon
Sweetening Agents
Copper
neotame