Surface molecularly imprinted polymers for solid-phase extraction of (--)-epigallocatechin gallate from toothpaste
Yunling Gao , Ying Hu , Kejian Yao
Front. Chem. Sci. Eng. ›› 2015, Vol. 9 ›› Issue (4) : 467 -478.
Surface molecularly imprinted polymers for solid-phase extraction of (--)-epigallocatechin gallate from toothpaste
Surface molecularly imprinted polymers (SMIPs) have been synthesized to selectively determine (−)-epigallocatechin gallate in aqueous media. SMIPs were prepared using a surface grafting copolymerization method on a functionalized silica gel modified with β-cyclodextrin and vinyl groups. The morphology and composition of the SMIPs were investigated by scanning electron microscopy, Fourier transform-infrared spectroscopy and thermogravimetric analysis. In addition, the molecular binding capacity, recognition properties and selectivity of the SMIPs were evaluated. The imprinted polymers were found to have a highly specific recognition and binding capacity for (−)-epigallocatechin gallate in aqueous media which is the result of the hydrophobic properties of the β-cyclodextrin and the hydrogen-bonding interactions of methacrylic acid. The SMIPs were successfully employed as solid-phase extraction adsorbents prior to the HPLC determination of (−)-epigallocatechin gallate in toothpaste. The HPLC analysis had a linear dynamic range of 0.5–50.0 µg⋅mL−1 with a correlation coefficient of 0.9998 and the recoveries ranged from 89.4% to 97.0% with relative standard deviations less than 4.8%. The limit of detection and limit of quantification were 0.17 and 0.33 µg⋅mL−1, respectively. The method provides a promising approach for the preparation of selective materials for the purification and determination of complex samples.
β-cyclodextrin / (−)-epigallocatechin gallate / surface molecular imprinting / solid-phase extraction
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Higher Education Press and Springer-Verlag Berlin Heidelberg
Supplementary files
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