Abstract
An efficient analytical method based on molecularly imprinted solid-phase extraction (MISPE) coupled with high-performance liquid chromatography-diode array detection (HPLC-DAD) was established for the determination of iridoid glycosides (IGs) in Di-huang pills. As the solid-phase extraction medium, superhydrophilic molecularly imprinted polymers (MIPs) with high affinity and selectivity to IGs in water media were fabricated using divinyl galactose as a single cross-linking monomer. The structure, porosity, and hydrophilicity of MIPs were characterized. The properties involving dynamic adsorption, kinetic adsorption, and selectivity were evaluated. Under optimal conditions the MISPE-HPLC-DAD based method was applied for loganin, morroniside, cornin, and sweroside determination in three kinds of Di-huang pills. The limits of detection of four IGs were 0.002–0.003 mg g−1. Furthermore, the proposed method exhibited some merits including good linearity, excellent precision, and desirable accuracy. The established MISPE-HPLC-DAD method has great potential for the selective determination of IGs in Chinese patent drugs.
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Acknowledgments
Financial support from the National Natural Science Foundation of China (No. 81603286), the Key Science and Technology Program of Shandong (No. 2016GSF202033), the Natural Science Foundation of Shandong (ZR2016YL006), the Priority Research Program of the Shandong Academy of Sciences (Lanping Guo), and the Shandong Province Taishan Scholar Program (Lanping Guo) are acknowledged.
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Ji, W., Wang, R., Mu, Y. et al. Superhydrophilic molecularly imprinted polymers based on a single cross-linking monomer for the recognition of iridoid glycosides in Di-huang pills. Anal Bioanal Chem 410, 6539–6548 (2018). https://doi.org/10.1007/s00216-018-1257-6
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DOI: https://doi.org/10.1007/s00216-018-1257-6