Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1216, Issue 47, Pages 8379-8385Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2009.09.064
Keywords
Synthetic colorants; Molecularly imprinted polymers; Multi-residue extraction; Chilli product
Funding
- National Natural Science Foundation of China [20575082, 20975117]
- Natural Science Foundation of Guangdong Province [7003714]
- Scientific Technology Project of Guangzhou City [2007Z3-E0441]
- Ministry of Education of China [20070558010]
- Medical Science Foundation of Guangdong Province [A2008084]
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A sorbent was synthesized and investigated for molecularly imprinted solid phase extraction (MISPE). Molecularly imprinted polymers (MIP) were synthesized via precipitation polymerization procedure, where 4-vinyl pyridine (4-VP) was used as functional monomer and ethylene glycol dimethacrylate (EDMA) as cross-linking agent. The imprinting effect of the MISPE was evaluated by elution experiments. The resulting MISPE showed high extraction selectivity to water-soluble and fat-soluble synthetic colorants. The determination of multi-residue for three kinds of water-soluble and six kinds of fat-soluble synthetic colorants in chilli products was also investigated by HPLC coupled with MISPE. The mean recoveries calculated by solvent calibration curve for water-soluble and fat-soluble synthetic colorants were from 72.1% to 95.6% for chilli spice and 72.1% to 92.3% for chilli powder. The decision limit (CC alpha) and the detection capability (CC beta) obtained for water-soluble and fat-soluble synthetic colorants were in the range of 1.2-1.6 and 1.9-2.4 mu g kg(-1) in chilli spice and chilli powder. The resulting MISPE was successfully used off-line for the determination of nine kinds of synthetic colorants in chilli products. (C) 2009 Elsevier B.V. All rights reserved.
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