Journal
ANALYTICA CHIMICA ACTA
Volume 762, Issue -, Pages 76-82Publisher
ELSEVIER
DOI: 10.1016/j.aca.2012.11.047
Keywords
Quantum dots; Molecularly imprinted polymer; Sensing material; Solid-phase extraction; High performance liquid chromatography; Ractopamine
Categories
Funding
- National Natural Science Foundation of China [31171683]
- Ministry of Science and Technology of China [2012BAK17B03]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1166]
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A novel dual-function material was synthesized by anchoring a molecularly imprinted polymer (MIP) layer on CdTe/ZnS quantum dots (QDs) using a sol-gel with surface imprinting. The material exhibited highly selective and sensitive determination of ractopamine (RAC) through spectrofluorometry and solid-phase extraction (SPE) coupled with high performance liquid chromatography (HPLC). A series of adsorption experiments revealed that the material showed high selectivity, good adsorption capacity and a fast mass transfer rate. Fluorescence from the MIP-coated QDs was more strongly quenched by RAC than that of the non-imprinted polymer, which indicated that the MIP-coated QDs acted as a fluorescence sensing material could recognize RAC. In addition, the MIP-coated QDs as a sorbent was also shown to be promising for SPE coupled with HPLC for the determination of trace RAC in feeding stuffs and pork samples. Under optimal conditions, the spectrofluorometry and SPE-HPLC methods using the MIP-coated QDs had linear ranges of 5.00 x 10(-10)-3.55 x 10(-7) and 1.50 x 10(-10)-8.90 x 10(-8) mol L-1, respectively, with limits of detection of 1.47 x 10(-10) and 8.30 x 10(-11) mol L-1, the relative standard deviations for six repeat experiments of RAC (2.90 x 10(-9) mol L-1) were below 2.83% and 7.11%. (C) 2012 Elsevier B.V. All rights reserved.
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