Highly sensitive electrochemical sensor based on La3+-doped Co3O4 nanocubes for determination of sudan I content in food samples

Food Chem. 2019 Jul 15:286:191-196. doi: 10.1016/j.foodchem.2019.01.143. Epub 2019 Jan 31.

Abstract

In current research, a sensitive screen printed electrochemical sensor on the basis of La3+-doped Co3O4 nanocubes was fabricated to determine sudan I. The electrochemical performance of sudan I at this sensor was investigated in detail, presenting that this sensor had electrocatalytic behavior for oxidizing sudan I due to the significant peak current enhancement and the dropping of oxidation overpotential. Under the optimum conditions, the linear response range for sudan I concentrations by the modified sensor was 0.3-300.0 µM, and detection limit was 0.05 µM. Lastly, the suggested technique was also studied as a selective, easy, and exact electrochemical sensor to determine sudan I in food samples, including chili powder, tomato paste, and ketchup sauce.

Keywords: Cobalt nitrate hexahydrate (PubChem CID: 24821); La(3+)-doped Co(3)O(4) nanocubes; Lanthanium nitrate hexahydrate (Pub Chem CID: 16211478); Polyvinylpyrrolidone (Pub Chem CID: 6917); Screen printed electrode; Sudan I; Sudan I (PubChem CID: 5858445).

MeSH terms

  • Cobalt / chemistry
  • Electrochemical Techniques / instrumentation
  • Electrochemical Techniques / methods*
  • Food Analysis / instrumentation
  • Food Analysis / methods*
  • Food Coloring Agents / analysis
  • Lanthanum / chemistry*
  • Limit of Detection
  • Nanostructures / chemistry*
  • Naphthols / analysis*
  • Naphthols / chemistry
  • Oxidation-Reduction
  • Oxides / chemistry

Substances

  • Food Coloring Agents
  • Naphthols
  • Oxides
  • Cobalt
  • 1-phenylazo-2-naphthol
  • Lanthanum
  • cobalt oxide