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Abstract: Molecularly imprinted polymers (MIPs) with caffeic acid as template and non-imprinted polymers (NIPs) materials were prepared in the same procedure. Field emission scanning electron microscopy (FE-SEM) and adsorption capacity test were used to evaluate characteristic of the new materials. MIPs, NIPs and C18 were used for rapid purification of caffeic acid from hawthorn with solid-phase extraction (SPE), and extract yields of caffeic acid with the proposed materials were 3.46 μg/g, 1.01 μg/g and 1.17 μg/g, respectively. To optimize the MIPs-SPE procedures, different kinds of elution solutions were studied. Deep eutectic solvents (DESs) were prepared by choline chloride (ChCl)-glycerol (1/2, n/n) and choline chloride-urea (1/2, n/n). Methanol was mixed with the two kinds of DESs (glycerol-based DESs, urea-based DESs) in different ratios (0.5:1, 1:1, 2:1, 3:1, 4:1, 5:1, v/v), and they were used to investigated as elution solutions in the above MIPs-SPE procedures. The results showed that MIPs were potential SPE materials, and methanol/glycerol-based DESs (3:1, v/v) had the best elution capability with the recovery of 82.32%.
Template and target information: caffeic acid
Author keywords: Solid-Phase Extraction (SPE), Deep eutectic solvents, molecularly imprinted polymers (MIPs), caffeic acid, hawthorn