Photoelectrochemical platform for sensing propyl gallate in edible oil samples based on CdTe quantum dots and poly(D-glucosamine)

  • Fernanda Maria dos Reis Lima
  • Saimon Moraes Silva
  • André da Silva Freires
  • Marília Oliveira Fonseca Goulart
  • Flavio Santos Damos
  • Rita de Cassia Silva LuzEmail author
Original Paper


This paper reports the development of a photoelectrochemical platform based on indium tin oxide (ITO) electrode modified with carboxyl-functionalized cadmium telluride quantum dots (CdTe) and poly(d-glucosamine) (PDG) for the determination of propyl gallate in edible oil samples. The photoelectrochemical (PEC) sensor was designed as ITO/CdTe/PDG and characterized by amperometry and electrochemical impedance spectroscopy. The ITO/CdTe/PDG PEC sensor showed higher photocurrent response for the propyl gallate compared to the photocurrents obtained for the bare ITO and ITO/CdTe electrodes. The amperograms showed that the photocurrent of the propyl gallate is much larger in the presence of oxygen suggesting that the presence of this molecule in the solution is essential to increase the sensitivity of the system. In addition, high selectivity was obtained when the proposed sensor was evaluated in samples containing other antioxidants and some ions. The linear range of response and detection limit for the determination of propyl gallate were 0.3 to 150 μmol L−1 (n = 10) and 0.13 μmol L−1, respectively. Recovery tests for propyl gallate in edible oils showed recovery percentages between 96.2 and 111.3%.


Propyl gallate Photoelectrochemical platform CdTe quantum dots Poly(D-glucosamine) 


Funding information

The authors received financial supports from FAPEMA (PRONEM-00155/16; UNIVERSAL-00927/16; UNIVERSAL-01194/17), CNPq (303525/2016-9; 421139/2016-1; 305680/2015-3; 426337/2016-6), and Instituto Nacional de Ciência e Tecnologia em Bioanalıtica (465389/2014-7).

Supplementary material

10008_2018_4177_MOESM1_ESM.docx (951 kb)
ESM 1 (DOCX 950 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Fernanda Maria dos Reis Lima
    • 1
  • Saimon Moraes Silva
    • 2
  • André da Silva Freires
    • 1
  • Marília Oliveira Fonseca Goulart
    • 3
  • Flavio Santos Damos
    • 1
  • Rita de Cassia Silva Luz
    • 1
  1. 1.Department of ChemistryFederal University of MaranhãoSão LuísBrazil
  2. 2.Faculty of Science, Engineering and TechnologySwinburne University of TechnologyHawthornAustralia
  3. 3.Institute of Chemistry and BiotechnologyFederal University of AlagoasMaceióBrazil

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