Desenvolvimento de métodos para determinação simultânea de fármacos, filtros UV e biocidas em matrizes ambientais utilizando VA-MSPD e HPLC-ESI-(QqLIT)-MS/MS
Resumo
Fármacos, produtos de cuidado pessoal e biocidas anti-incrustantes de 3ª
geração fazem parte de um grupo de contaminantes orgânicos amplamente
estudados em diferentes compartimentos ambientais ao redor do mundo. Para
que seja possível suas determinações, se faz necessário o uso de preparo de
amostra, onde técnicas miniaturizadas têm recebido atenção por parte dos
Químicos Analíticos. Essas técnicas minimizam a utilização de massa de
amostra, volume de solvente e por consequencia a geração de resíduos dentro
do laboratório. Entretanto, o acoplamento das técnicas miniaturizadas com a
possibilidade de determinação de compostos de diferentes classes e
propriedades físico-químicas é considerado um desafio. Com isso, o desafio e
contribuição desse trabalho foi o estudo da Dispersão da Matriz em Fase Sólida
Assistida por Vórtex (VA-MSPD, do inglês Vórtex Assisted-Matrix Solid Phase
Dispersion) na busca de uma técnica miniaturizada, rápida, e que possibilitasse
a extração simultância de um grupo selecionado de 59 compostos orgânicos em
sedimento e tecidos de peixe. Em ambos métodos desenvolvidos as
determinações foram realizadas por cromatografia líquida acoplada a
espectrometria de massas sequencial com analisador de armadilha de íons. Nas
condições otimizadas do método desenvolvido para sedimento utilizou-se 2 g de
massa de amostra isenta de suporte sólido e 5 mL de metanol como solvente de
extração. Os limites de quantificação do método ficaram entre 0,42 e 36,83 ng g1
. Para o método desenvolvido para diferentes tecidos de peixe a condição
otimizada utilizou 0,5 g de massa de amostra, 2 g de sílica como suporte sólido
e 5 mL de metanol como solvente. Para esse método os limites de quantificação
do método ficaram entre 3,31 e 137,51 ng g-1
. Os valores de recuperação de
ambos métodos ficaram entre 70 e 120%, com RSD ≤ 20% para a maioria dos
analitos de estudo. A quantificação foi realizada por padronização interna e foram
encontrados alguns dos compostos nas amostras de sedimento na faixa de 1,55
a 69,69 ng g-1 e na faixa de 24,16 a 21039,2 ng g-1 nos diferentes tecidos de
peixe. Comparados com outros métodos da literatura, os métodos propostos
nesse trabalho apresentaram sensibilidade, seletividade, além de serem mais
rápidos, simples e fácil execução.
Drugs, personal care products and the third generation of antifouling booster biocides are part of a group of organic contaminants widely studied in different environmental compartments around the world. For it’s determination, it’s necessary to use sample preparation, where miniaturized techniques have received attention from Analytical Chemists. These techniques minimize the use of sample mass, solvent volume and consequently the generation of waste within the laboratory. However, the coupling of miniaturized techniques with the possibility of determination of compounds of different classes and physicalchemical properties is considered a challenge. Thus, the challenge and contribution of this work was the study of Vortex Assisted-Matrix Solid Phase Dispersion (VA-MSPD) in the search for a miniaturized, fast technique that extraction of a selected group of 59 organic compounds in sediment and fish tissues. In both developed methods determinations were performed by liquid chromatography coupled to sequential mass spectrometry with ion trap analyzer. Under optimized conditions of the method developed for sediment was used 2 g of solid support free sample mass and 5 mL of methanol as the extraction solvent. The limits of quantification of the method were between 0.42 and 36.83 ng g-1 . For the method developed for different fish tissues the optimized condition used 0.5 g of sample mass, 2 g of silica as solid support and 5 mL of methanol as solvent. For this method the limits of quantification of the method were between 3.31 and 137.51 ng g-1 . The recovery values of both methods were between 70 and 120%, with RSD ≤ 20% for most study analytes. The quantification was performed by internal standardization and some of the compounds were found in the sediment samples in the range of 1.55 to 69.69 ng g-1 and in the range of 24.16 to 21039.2 ng g-1 in the different tissues of fish. Compared to other methods in the literature, the methods proposed in this study showed sensitivity, selectivity, and are faster, simpler and easier to perform.
Drugs, personal care products and the third generation of antifouling booster biocides are part of a group of organic contaminants widely studied in different environmental compartments around the world. For it’s determination, it’s necessary to use sample preparation, where miniaturized techniques have received attention from Analytical Chemists. These techniques minimize the use of sample mass, solvent volume and consequently the generation of waste within the laboratory. However, the coupling of miniaturized techniques with the possibility of determination of compounds of different classes and physicalchemical properties is considered a challenge. Thus, the challenge and contribution of this work was the study of Vortex Assisted-Matrix Solid Phase Dispersion (VA-MSPD) in the search for a miniaturized, fast technique that extraction of a selected group of 59 organic compounds in sediment and fish tissues. In both developed methods determinations were performed by liquid chromatography coupled to sequential mass spectrometry with ion trap analyzer. Under optimized conditions of the method developed for sediment was used 2 g of solid support free sample mass and 5 mL of methanol as the extraction solvent. The limits of quantification of the method were between 0.42 and 36.83 ng g-1 . For the method developed for different fish tissues the optimized condition used 0.5 g of sample mass, 2 g of silica as solid support and 5 mL of methanol as solvent. For this method the limits of quantification of the method were between 3.31 and 137.51 ng g-1 . The recovery values of both methods were between 70 and 120%, with RSD ≤ 20% for most study analytes. The quantification was performed by internal standardization and some of the compounds were found in the sediment samples in the range of 1.55 to 69.69 ng g-1 and in the range of 24.16 to 21039.2 ng g-1 in the different tissues of fish. Compared to other methods in the literature, the methods proposed in this study showed sensitivity, selectivity, and are faster, simpler and easier to perform.
Descrição
Tese (Doutorado)
Palavras-chave
PPCPs, VA-MSPD, Sedimento, Peixe, Cromatografia líquida, Sediment, Fish, Liquid chromatographic
Citação
SOARES, Karina Lotz. Desenvolvimento de métodos para determinação simultânea de fármacos, filtros UV e biocidas em matrizes ambientais utilizando VA-MSPD e HPLC-ESI-(QqLIT)-MS/MS. 2019. 190 f. Tese (Doutorado em Química Tecnológica e Ambiental) – Programa de Pós-Graduação em Química Tecnológica e Ambiental , Escola de Química e Alimentos, Universidade Federal do Rio Grande, Rio Grande, 2019.
