Abstract
Salting-out assisted liquid-liquid extraction (SALLE) coupled to dispersive liquid-liquid microextraction (DLLME) was developed as an efficient extraction method for purification and preconcentration of bisphenol A and six analogs (B, E, F, S, BADGE, BFDGE) in canned coffee drinks. Ultra-performance liquid chromatography-tandem mass spectrometry was applied for the determination of the analytes. The parameters affecting the extraction efficiency in SALLE and DLLME procedures were investigated. Under optimum conditions, matrix-matched calibration curves were established using standard solution spiked canned coffee samples in the range of 0.5–50 μg kg−1 and limit of detections (LODs) were in the range of 0.01–0.1 μg kg−1. Recoveries obtained from spiked canned coffee samples at three concentration levels ranged from 70.3 to 98.3% and the relative standard deviations were lower than 8% for intra- (n = 3) and inter-day (n = 3) precisions at a concentration of 1.0 μg kg−1 of each analyte. The proposed method has the advantages of simple operation, low consumption of organic solvent, fast phase separation, high efficiency, and good selectivity. When applied to eight different brands of analyzed canned coffee samples, it showed good applicability for the determination of the analytes and BPA was detected in 7 out of 8 samples (87.5%). The proposed method was also compared with previous other methods.
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