Poly m-aminophenol/ nylon 6/graphene oxide electrospun nanofiber as an efficient sorbent for thin film microextraction of phthalate esters in water and milk solutions preserved in baby bottle.

In this paper, poly m-aminophenol/nylon 6/graphene oxide (PmAP/N6/GO) electrospun nanofiber was fabricated and applied as an efficient sorbent for thin film microextraction (TFME) of phthalate esters (PAEs). The porosity, morphology, wettability, solvent stability and chemical structure of the prepared nanofiber were evaluated. The prepared PmAP/N6/GO nanofiber film exhibited some prominent advantages such as large surface area, porous fibrous structure, high stability, good hydrophilicity and excellent extraction efficiency. Afterward, thin film microextraction-gas chromatography-mass spectroscopy (TFME-GC-MS) method was developed for the quantitative analysis of PAEs, and the effective parameters on the extraction performance were investigated systematically. At the optimal operating conditions, the large linearity range (0.5-250 ng mL) with excellent correlation coefficient (<0.998) had been acquired for this method. Moreover, low limits of detection (LODs) (0.1-0.15 ng mL) exhibited the satisfactory sensitivity of the proposed method. Finally, the TFME-GC-MS method was successfully utilized for the measurement of PAEs in milk solutions and drinking water preserved in baby bottle with satisfactory relative recoveries (RRs) (88-101%) and relative standard deviations (RSDs) lower than 8.0% (n = 3). Totally, a simple, rapid, sensitive and highly efficient method was introduced to analyze trace PAEs in complex samples.