Abstract
A type of molecular-imprinted polymer with magnetic molybdenum disulfide as a base and deep eutectic solvent as a functional monomer (Fe3O4@MoS2@DES-MIP) was prepared with surface molecular imprinting method. It was applied as the adsorbent for the selective recognition and separation of (+)-catechin, (−)-epicatechin, (−)-epigallocatechin, (−)-epicatechin gallate, and (−)-epigallocatechin gallate in green tea in the process of magnetic solid-phase extraction (MSPE) combined with high-performance liquid chromatography (HPLC). The structure of Fe3O4@MoS2@DES-MIP was characterized by Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The adsorption properties and selective recognition ability on (−)-epigallocatechin gallate and the other four structural analogues were examined and compared. The results show that the polymer has excellent selective recognition ability for (−)-epigallocatechin gallate, and its adsorption capacity was much higher than that of structural analogues. The Fe3O4@MoS2@DES-MIP not only has the special recognition ability to template a molecule, but also can be separated by magnets with high separation efficiency and can be used in MSPE.
Highlights
Green tea is considered a healthy drink and has become one of the most widely consumed beverages [1]
The magnetic surface molecularly imprinted polymer of Fe3 O4 @MoS2 @Deep eutectic solvents (DESs)-molecularly imprinted polymers (MIP) was successfully synthesized with epigallocatechin gallate (EGCG) as a template, Fe3 O4 @MoS2 as a base, and a new type of DES as a functional monomer, and it was applied in the magnetic solid-phase extraction (MSPE)-high-performance liquid chromatography (HPLC) method for the selective recognition and separation of five kind of catechins (C, EC, EGC, epicatechin gallate (ECG), and EGCG) in green tea
The results show that the adsorption capacity of MIP was about six times higher than that of non-imprinted polymer (NIP)
Summary
Green tea is considered a healthy drink and has become one of the most widely consumed beverages [1] It has been used in the food, pharmaceutical, chemical, and light industries for thousands of years, especially in Asia, because of its numerous benefits, such as cancer prevention, inhibition of oxidation, and lowering blood pressure [2,3,4]. (−)-epigallocatechin (EGC), (−)-epicatechin gallate (ECG), and (−)-epigallocatechin gallate (EGCG) are the main catechins in green tea. Their excellent anti-oxidation, anti-cancer, and anti-cancer activities have prompted research into the separation and purification of those bioactive compounds [7,8,9]. These techniques do not meet the requirements of the separation and purification of trace analogs in complex systems, and these analogs are often difficult to analyze
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