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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Use of graphene supported on aminopropyl silica for microextraction of parabens from water samples

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Fumes, Bruno Henrique ; Lancas, Fernando Mauro
Total Authors: 2
Document type: Journal article
Source: Journal of Chromatography A; v. 1487, p. 64-71, MAR 3 2017.
Web of Science Citations: 16

This paper describes the synthesis, characterization and use of graphene supported on aminopropyl silica through covalent bonds (Si-G) as a sorbent for microextraction by packed sorbent (MEPS). Five parabens (methyl, ethyl, propyl, butyl and benzyl) present in water matrices were used as model compounds for this evaluation. The Si-G phase was compared to other sorbents used in MEPS (C18 and Strata(Tm)-X) and also with graphene supported on primary-secondary amine (PSA) silica, where Si-G showed better results. After this, the MEPS experimental parameters were optimized using the Si-G sorbent. The following variables were optimized through univariate experiments: pH (4,7 and 10), desorption solvent (ACN:MeOH (50:50), ACN:H2O (40:60), MeOH and ACN) and ionic strength (0, 10 and 20% of NaCI). A factorial design 2(6-2) was then employed to evaluate other variables, such as the sample volume, desorption volume, sampling cycles, wash cycles and desorption cycles, as well as the influence of NaCI% on the extraction performance. The optimized method achieved a linear range of 0.2-20 mu g/L for most parabens; weighted calibration models were employed during the linearity evaluation to reduce the absolute sum of the residue values and improve R-2, which ranged from 0.9753 to 0.9849. The method's accuracy was 82.3-119.2%; precision, evaluated as the coefficient of variance for intraday and interday analysis, ranged from 1.5 to 19.2%. After evaluation of the figures of merit, the method was applied to the determination of parabens in water samples. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 15/15462-5 - Employment of graphene as sorbent in miniaturized sample preparation techniques
Grantee:Bruno Henrique Fumes
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 14/07347-9 - Development of novel materials and devices for miniaturized sample preparation techniques in the area of food safety
Grantee:Fernando Mauro Lanças
Support type: Regular Research Grants