Metal organic framework derived Zn/N co-doped hydrophilic porous carbon for efficient solid phase microextraction of polar phenols.

MOF-derived zink and nitrogen co-doped porous carbon (ZNPC) was synthesized through the pyrolysis of MOF-5-NH2 and used as a solid-phase microextraction (SPME) coating material. Coupled with gas chromatography-mass spectrometry (GC–MS), headspace SPME (HS-SPME) based on ZNPC was adopted for the determination of phenols in food samples. The co-existence of N and Zn in ZNPC endows the derived carbon superior hydrophilicity, which is highly beneficial for phenols capture. After optimizing the conditions of extraction and desorption, a sensitive analytical method was established with low limits of detections (LODs, 0.73–2.3 ng g−1) and wide linear ranges (5–5000 ng g−1). Both the intra-fiber repeatability (RSDs from 2.8–7.3%) and inter-fiber reproducibility (RSDs from 9.7–11.7%) were satisfactory. The established method was applied to phenol determination in beef jerky and duck neck with satisfactory recoveries of 81.2–120.4% and RSDs of 2.8–9.9%, which met well with the requirement of practical application.