Amperometry detection of nitrite in food samples using tetrasulfonated copper phthalocyanine modified glassy carbon electrode

A. Sudarvizhi, K. Pandian, Oluwatobi Samuel Oluwafemi, Subash C.B. Gopinath

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

A stable chitosan protected tetrasulfonated copper phthalocyanine (Chit-TsCuPc) modified glassy carbon electrode (GCE) was used to aid the electrochemical detection of nitrite (NO2) in food samples. The electrochemical oxidation of NO2 was investigated on bare, chitosan and TsCuPc modified GCE in presence of phosphate buffer solution with an acidic medium. The elevated oxidation peak current was noticed at less oxidation potential for + 0.55 V vs. Ag/AgCl at Chit-TsCuPc modified electrode under the optimized experimental conditions. The plot displays the peak current against NO2 with a good linearity in the concentration rangefrom 6.5 × 10−8 M to 5.0 × 10−10M. The linear regression equation is calculated to be Ip (μA) = 0.5291 + 1.4894C (NO2), has a good correlation coefficient of 0.9949 and the detection limit of 22 nM (S/N = 3) with the current sensitivity of 4.964 μA nM−1 cm−2. The standard addition method was adopted to measure the unknown NO2 concentration in food samples.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
JournalSensors and Actuators B: Chemical
Volume272
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Amperometric detection
  • Chitosan
  • Food sample
  • Limit of detection
  • Nitrite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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