Mesoporous poly(amino acids) ionic liquid with excellent extraction performance for sunset yellow

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%. •A novel solid phase extraction for separation of sunset yellow.•Application of poly amino acid ionic liquid as extractant.•Analysis for sunset yellow using High performance liquid chromatography.•The proposed method considered as an excellent analysis.