Abstract
A new sorbent was synthesized for restricted-access matrix solid phase extraction (RAM-SPE) of the diabetes drugs metformin (MET) and glimepiride (Glim). Mesoporous silica layers were placed on Fe3O4-magnetized graphene modified with sulfo-functionalized pore walls (denoted as magG@mSiO2-SO3H composites). The composites have a large specific surface (173 m2·g−1), appropriate pore sizes (typically 3.7 nm), and sulfo-functionalized pore walls. Magnetic separation can be accomplished within 10 s. The unique properties of the composites allow both MET and Glim to be selectively and quickly extracted from plasma sample. Following magnetic separation and elution by 50% aqueous acetonitrile with 4% ammonium solution, the two drugs were quantified by LC-MS/MS analysis. The assay has high selectivity, good linearity (2.5–4000 ng•mL−1 for MET and 0.02–1600 ng•mL−1 for Glim), a low detection limit (as low as 60 pg•mL−1 for MET and 1 pg•mL−1 for Glim), excellent recovery (above 92.2%), and good precision (RSDs <12%). The method was successfully applied in a pharmacokinetic study in beagle dogs.
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Acknowledgements
This work was supported by funds provided by the Natural Science Foundation of China (Project no. 21675034), the Natural Science Foundation of Shanghai (Project no. 16ZR1402300), the Ministry of Science and Technology of the People’s Republic of China (Grant no. 2018ZX09J18112), PDH-SPFDU Joint Research Fund (no. RHJJ2017-02), Outstanding Leaders Training Program of Pudong Health Bureau of Shanghai (No. PWR12014-06), Integrative Medicine special fund of Shanghai Municipal Health Planning Committee (No. ZHYY-ZXYJHZX-2-201712) and Key studies (special) Department Fund of the Pudong New Area Health Planning Commission (No. PWZzk2017-03).
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Jiang, J., She, X., Zhu, J. et al. A composite consisting of sulfo-functionalized magnetic graphene and mesoporous silica for extraction of metformin and glimepiride prior to their determination by liquid chromatography tandem mass spectrometry. Microchim Acta 186, 590 (2019). https://doi.org/10.1007/s00604-019-3693-1
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DOI: https://doi.org/10.1007/s00604-019-3693-1