MoS 2 quantum dots-based optical sensing platform for the analysis of synthetic colorants. Application to quinoline yellow determination.

Autor: Martínez-Moro R; Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias. c/ Francisco Tomás y Valiente, N°7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049 Madrid, Spain., Del Pozo M; Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias. c/ Francisco Tomás y Valiente, N°7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049 Madrid, Spain., Casero E; Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias. c/ Francisco Tomás y Valiente, N°7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049 Madrid, Spain., Petit-Domínguez MD; Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias. c/ Francisco Tomás y Valiente, N°7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049 Madrid, Spain. Electronic address: mdolores.petit@uam.es., Quintana C; Departamento de Química Analítica y Análisis Instrumental. Facultad de Ciencias. c/ Francisco Tomás y Valiente, N°7. Campus de Excelencia de la Universidad Autónoma de Madrid, 28049 Madrid, Spain. Electronic address: carmen.quintana@uam.es.
Jazyk: angličtina
Zdroj: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [Spectrochim Acta A Mol Biomol Spectrosc] 2023 Dec 05; Vol. 302, pp. 123042. Date of Electronic Publication: 2023 Jun 19.
DOI: 10.1016/j.saa.2023.123042
Abstrakt: In this work, a novel fluorescence sensor has been designed to solve the actual need of new fast and inexpensive sensing platforms for the analysis of synthetic colorants. It is based on MoS 2 quantum dots obtained by a hydrothermal method and incorporated as fluorophore into the matrix of PVC membranes, which are deposited on quartz substrates by spin-coating. It was proven, as in these conditions, MoS 2 quantum dots maintain the fluorescent properties that they present in solution. Experiments carried out in solution displayed a maximum emission when they were excited under 310 nm. This initial fluorescence decreases linearly in presence of increasing concentrations of various synthetic colorants namely quinoline yellow, tartrazine, sunset yellow, allura red, ponceau 4R and carmoisine. The two possible mechanisms that can explain this quenching effect, colorants absorbing photons emitted by quantum dots and/or competing with the nanomaterial for photons coming from the excitation source, were evaluated. The most pronounced effect was observed with quinoline yellow, as a result of a mixed mechanism. The optimized methodology developed for the determination of quinoline yellow showed a linear concentration range between 5.4 and 55.0 µg with a limit of detection of 1.6 µg. The sensor was applied to the determination of quinoline yellow in a food colour paste obtaining results in good agreement with those obtained by HPLC-UV-vis measurements.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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