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Reference type: Journal
Authors: Zhai HY, Su ZH, Chen ZG, Liu ZP, Yuan KS, Huang L
Article Title: Molecularly imprinted coated graphene oxide solid-phase extraction monolithic capillary column for selective extraction and sensitive determination of phloxine B in coffee bean.
Publication date: 2015
Journal: Analytica Chimica Acta
Volume: 865
Page numbers: 16-21.
DOI: 10.1016/j.aca.2015.01.028
Alternative URL: http://www.sciencedirect.com/science/article/pii/S0003267015000823

Abstract: A method was developed to sensitively determine phloxine B in coffee bean by molecularly imprinted polymers (MIPs) coated graphene oxide (GO) solid-phase extraction (GO-MISPE) coupled with high-performance liquid chromatography and laser-induced fluorescence detection (HPLC-LIF). The GO-MISPE capillary monolithic column was prepared by water-bath in situ polymerization, using GO as supporting material, phloxine B, methacrylic acid (MAA), and ethylene dimethacrylate (EDMA) as template, functional monomer, and cross-linker, respectively. The properties of the homemade GO-MISPE capillary monolithic column, including capacity and specificity, were investigated under optimized conditions. The GO-MIPs were characterized by scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy (FT-IR). The mean recoveries of phloxine B in coffee bean ranged from 89.5% to 91.4% and the intra-day and inter-day relative standard deviation (RSD) values all ranged from 3.6% to 4.7%. Good linearity was obtained over 0.001-2.0 μg mL-1 (r = 0.9995) with the detection limit (S/N = 3) of 0.075 ng mL-1. Under the selected conditions, enrichment factors of over 90-fold were obtained and extraction on the monolithic column effectively cleaned up the coffee bean matrix. The results demonstrated that the proposed GO-MISPE HPLC-LIF method can be applied to sensitively determine phloxine B in coffee bean
Template and target information: phloxine B
Author keywords: Phloxine B, Graphene oxide-molecularly imprinted polymers, Solid-phase extraction, In situ polymerization, monolithic capillary column

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