Photoelectrochemical platform for sensing propyl gallate in edible oil samples based on CdTe quantum dots and poly(D-glucosamine)
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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%.
KeywordsPropyl gallate Photoelectrochemical platform CdTe quantum dots Poly(D-glucosamine)
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).
- 7.Kütter MT, Romano LA, Ventura-Lima J, Tesser MB, Monserrat JM (2014) Antioxidant and toxicological effects elicited by alpha-lipoic acid in aquatic organisms. Comp Biochem Physiol Part C: Toxicol Pharmacol 162:70–76Google Scholar
- 39.Zucolotto V, Gatta´s-Asfura KM, Tumolo T, Perinotto AC, Antunes PA, Constantino CJL, Baptista MS, Leblanc RM, Oliveira Jr ON (2005) Nanoscale manipulation of CdSe quantum dots in layer-by-layer films: influence of the host polyelectrolyte on the luminescent properties. Appl Surf Sci 246:397–402, 4.Google Scholar
- 47.Agui L, Lopez-Huertas MA, Yañez-Sedeño P, Pingarrón JM (1996) Voltammetric behaviour of poly(3-methylthiophend)-coated cylindrical carbon fibre microelectrodes: electrochemical oxidation of the antioxidant propyl gallate. J Electroanal Chem 414:141–148Google Scholar
- 52.Caramit RP, Araújo ASA, Fogliatto DK, Viana LH, Trindade MAG, Ferreira VS (2015) Carbon-nanotube–modified screen-printed electrodes, cationic surfactant, and peak deconvolution procedure: alternatives to provide satisfactory simultaneous determination of three synthetic antioxidants in complex samples. Anal Methods 7(9):3764–3771CrossRefGoogle Scholar