Fabrication of polypyrrole-silver nanocomposite for hollow fiber solid phase microextraction followed by HPLC/UV analysis for determination of parabens in water and beverages samples

Abstract

In the present study, a nanocomposite of polypyrrole-silver nanoparticles was made as a new sorbent of hollow fiber solid-phase microextraction method and it was utilized for the preconcentration and determination of trace amounts of parabens in water, fruit juice, and beer samples. Polypyrrole was synthesized by chemical oxidative polymerization on the wall surface of a hollow fiber. Then a green method was employed for the synthesis of silver nanoparticles on the polypyrrole. This coating showed impressive mechanical and chemical stability. Hollow fiber as solid phase microextraction fiber is conformable with complex matrices and exhibits high clean up and selectivity without memory effect due to its porosity. A number of significant factors were optimized. The limit of detection, under the optimal conditions, for all of the parabens was in 0.01 μg L−1. The method exhibited good linearity in the range of 0.05–200 μg L−1, with limit of quantification of 0.05 μg L−1, coefficients of determination better than 0.9990 and extraction recoveries of 25.0–28.0%. The intra- and inter-assay precisions (RSD%, n = 3) were in the range of 2.4–3.1 % and 3.4–4.2%, respectively. The relative recovery values for the spiked samples were in the acceptable range of 90.4–104.0%.