ABSTRACT
A fast method composed of the quick, easy, cheap, effective, rugged and safe ( QuEChERS) and temperature-assisted ionic liquid dispersive liquid-liquid microextraction ( TA-IL-DLLME) sample preparation coupled with high performance liquid chromatography ( HPLC ) for the analysis of 5 dyes residues in navel orange was developed. The QuEChERS sample preparation involved the quick extraction with acetonitrile in the presence of anhydrous MgSO4 and NaCl and the purification with primary secondary amine ( PSA ) sorbent. The TA-IL-DLLME sample preparation was processed using 1 mL of the extract obtained by QuEChERS as dispersive solvent and 60 μL of 1-octyl-3-methylimidazolium hexafluorophosphate as extractive solvent under 55 ℃ of water-bath temperature and 12 min of water-bath time. The ultimate solution was detected by HPLC-UV and the contaminated sample was further confirmed by UPLC-MS/MS under multiple reactions monitoring (MRM) mode. The recoveries of five dyes were in the range from 70. 3% to 93. 6% at two spike levels of 0. 01 and 0. 05 mg/kg, the relative standard deviations (RSDs) were between 3. 5% and 9. 2% and the limits of quantification (LOQs) were between 1. 1 and 2. 8 μg/kg.