Abstract
The poly amino acid ionic liquid {1-ethyl-3-benzyltriethylammonium alanine P[ETA][Ala]} was synthesized and characterized with Fourier Transform Infrared Spectroscopy (FTIR), Carbon Nuclear Magnetic Spectra(13C NMR), Scanning Electron Microscope (SEM), X-ray (XRD), Brumaire-Emmett-Teller (BET). SEM and BET confirmed that P[ETA][Ala] was a porous material. Under optimized conditions, the linear range of sunset Yellow (SY) was 0.02–20.00 μg mL−1, the limit of detection (LOD) was 0.01 μg mL−1 and the enrichment factor was 11.0 (pre-extraction solution volume/elution volume). The isothermal adsorption and kinetic models were investigated to explain the extraction (adsorption) mechanism of SY on P[ETA][Ala]. This proposed method was successfully applied the analysis of beverage samples with recoveries of 92.0–110.0% and relative standard deviations of 1.1–5.0%.
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