A novel Schiff base network-1 nanocomposite coated fiber for solid-phase microextraction of phenols from honey samples

●Schiff base network-1 was synthesized and used as SPME coating.●The coating shows the advantage in extraction of phenols.●The fiber possesses a good high thermal stability and long service time.

A novel covalent organic framework, Schiff base network-1 (SNW-1), was synthesized and used as a solid-phase microextraction (SPME) fiber coating material. The SNW-1 coated SPME fiber was fabricated by a covalent chemical cross-linking between the SNW-1 nanocomposite and a silanol-functionalized stainless steel wire substrate. Scanning electron microscopy and nitrogen isothermal adsorption results indicate that the new fiber coating exhibited a porous, homogenous surface with the Brunauer-Emmett-Teller surface of 668 m2 g−1. The prepared fiber was explored for the SPME of phenols from honey samples prior to their determination by gas chromatography-mass spectrometry. The developed method had large enrichment factors (136–816), low limits of detection (0.06–0.2 ng g−1), good linearity (0.1–100.0 ng g−1) and repeatability (<9.7%) for phenols. The recoveries for spiked phenols (1.0 ng g−1 and 10.0 ng g−1) in Wolfberry, Robinia and Codonopsis honey samples were in the range of 84.2–107.2% with the relative standard deviations ranging from 3.8% to 12.7%. The developed method was suitable for the determination of phenols from honey samples.

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