Poly(aniline-co-m-aminobenzoic acid) immobilized on a magnetic graphene based nanocomposite as a solid-phase sorbents for the extraction of parabens, and their quantitation by GC

We report on the preparation of poly(aniline-co-m-aminobenzoic acid) immobilized on graphene-modifiedmagnetite nanoparticles. The new material was applied as a sorbent for magnetic solid-phase extraction (MSPE) ofmethyl-, propyl-, and butylparaben. The use of graphene warrants a high surface area and prevents aggregation of thenanoparticles. The copolymer, in turn, warrants multi-functionality, high extraction capacity, and stability even in basicmedium.The parabens were converted to their acetylated derivatives and the determined by gas chromatography-flameionization (GC-FID). Preconcentration factors range from 190 to 310. The method has detection limits of <2.8 μg L-1.Linear ranges of the calibration plots extend from 5 to 2000 μg L-1 for propyl and butyl parabens, and from 10 to 2000μg L-1 for methyl paraben. The method was applied to the determination of the parabens in cosmetic products. Extractionrecoveries range from 89 to 101%, with relative standard deviations (RSDs) of ≤ 7.9%.

Keywords:

Graphene , Nanocomposite , Magnetic solid phase extraction , Parabens , Gas chromatography-flameionization