A Zr(IV)-based porphyrinic metal-organic framework as a solid-phase sorbent for extraction of sulfonamides prior to their quantitation by LC-MS

A porphyrinic metal–organic framework (PCN-224) was fabricated and used as an adsorbent for solid-phase extraction of ultratrace levels of polar sulfonamide antibiotics from food and drinking waters. The PCN-224 was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, and powder X-ray diffraction analyses. Parameters affecting the extraction efficiency were optimized. The sulfonamides were quantified by liquid chromatography-tandem mass spectrometry. Figures of merit include (a) low limits of detection (0.07–0.47 ng·L−1), (b) wide linear ranges (0.5–2000 ng·L−1), and (c) good repeatabilities (2.8%–6.7%) and reproducibilities (1.7%–5.1%). The method was successfully applied to the determination of sulfonamides in food and drinking water samples.