Three-dimensional porous reduced graphene oxide decorated with carbon quantum dots and platinum nanoparticles for highly selective determination of azo dye compound tartrazine

Food Chem Toxicol. 2021 Dec:158:112698. doi: 10.1016/j.fct.2021.112698. Epub 2021 Nov 24.


In this work, an electrochemical sensor for the azo dye compound tartrazine (TRT) determination was proposed. A screen-printed carbon electrode (SPCE) was modified by depositing three-dimensional porous reduced graphene oxide decorated with carbon quantum dots and platinum nanoparticles (Pt/CQDs@rGO/SPCE). The resulting amount of TRT was observed by differential pulse voltammetry. Under optimal conditions, the sensor exhibited two wide linearities ranging from 0.01 to 1.57 μM and 1.57-9.3 μM with the reliability coefficient of determination of 0.991 and 0.992, respectively. The detection limit (LOD) was also estimated to be 7.93 nM. Moreover, the Pt/CQDs@rGO/SPCE suggested high selectivity in the presence of several interfering agents and azo dye compounds that have a similar structure. Additionally, the Pt/CQDs@rGO/SPCE revealed superior recovery values of about 96.5-101.6% for candy, 99.7-103.5% for soft drinks, 96.0-101.2% for jelly powder, and 98.0-103.0% for water samples. Furthermore, the fabricated sensor exhibits excellent selectivity, stability, reproducibility, and repeatability, indicating a great perspective in the monitoring of TRT. Therefore, it can be speculated that the proposed electrode could be effectively applied to determine TRT in food samples.

Keywords: Azo dye; Carbon quantum dots; Electrochemical sensor; Screen-printed carbon electrode; Tartrazine; Three-dimensional graphene oxide.

MeSH terms

  • Carbon / chemistry
  • Electrochemical Techniques / methods*
  • Electrodes
  • Graphite / chemistry*
  • Limit of Detection
  • Linear Models
  • Metal Nanoparticles / chemistry*
  • Platinum / chemistry
  • Porosity
  • Quantum Dots / chemistry*
  • Reproducibility of Results
  • Tartrazine / analysis*


  • graphene oxide
  • Platinum
  • Carbon
  • Graphite
  • Tartrazine