Journal
TALANTA
Volume 116, Issue -, Pages 396-402Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.05.067
Keywords
Molecularly imprinted polymer; Silica gel; Solid-phase extraction; Melamine
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Funding
- National Natural Science Foundation of China [21075025]
- Natural Science Foundation of Heilongjiang Province [B200910]
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Highly selective molecularly imprinted layer-coated silica gel (MIP@SiO2) for melamine (MEL) was prepared by the surface molecular imprinting technique on the supporter of silica gel. Non-imprinted polymer layer-coated silica gel (NIP@SiO2) and bulk molecularly imprinted polymer (MIP) were also prepared for comparison. Characterization and performance tests of the obtained products revealed that MIP@SiO2 not only had excellent selectivity to the target molecule MEL compared with NIP@SiO2, but also displayed absorption capacity superior to MIP due to the molecular recognition sites on the surface of silica gel. As the MIP@SiO2 were adopted as the adsorbents of solid-phase extraction for detecting MEL in milk samples, the recoveries of spiked samples ranged from 75.6% to 96.8% with the relative standard deviation of spiked samples less than 10%, which reveals that the MIP@SiO2 were efficient SPE adsorbents for melamine. (C) 2013 Elsevier B.V. All rights reserved.
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