Abstract
Ionic liquids β-cyclodextrin polymer (mono-6-deoxy-6-(1-ethyl-imidazolium)-β-cyclodextrin iodide polymer, ILs-β-CDCP) was synthesized. A novel method based on ILs-β-CDCP solid phase extraction coupled with UV-visible spectrophotometry for the preconcentration / separation allura red (AR) was investigated. The results was shown that AR was adsorbed on ILs-β-CDCP and eluted with sodium dodecyl sulfate (SDS) (1%) rapidly. Under the optimum conditions, the preconcentration factor for AR was 27. The linear range, detection limit (DL), correlation coefficient (R) and relative standard deviation (RSD) were found to be 0.10-9.00 μg/mL, 5.2 μg/L, 0.9987 and 3.10% (n=3, c=4.00 μg/mL), respectively. The adsorption mechanism of ILs-β-CDCP on AR was studied through the FTIR analysis and the inclusion constant of ILs-β-CDCP-AR. This proposed method has been successfully applied to the determination of AR in food samples.
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