[Determination of three tranquillizer residues in animal foods by QuEChERS-high performance liquid chromatography-tandem mass spectrometry].

A method for simultaneous determination of chlorpromazine, diazepam and metolazone residues in porcine muscle, fish, liver and kidney was developed using QuEChERS and HPLC-MS/MS technique. The samples were extracted with ethyl acetate and cleaned up with C, -propylethylendiamine (PSA) and NH sorbents after using NaSO as dehydrating agent. The analytes were separated by a special C column, Atlantis T3, and gradiently eluted with a mixed solution of 5 mmol/L formic acid and acetonitrile at a flow rate of 0.35 mL/min. The mass spectrometric analysis that quantified using isotope internal standard, was carried out with electrospray positive ion source (ESI) and multiple reaction monitoring mode (MRM). The linearity of the calibration curves was good in the range of 0.2-5.0 μ g/L. The recoveries at three different spiked levels (0.5, 1 and 5 μ g/kg) in four matrices were in the range of 92.5%-117.8%. The repeatability expressed as relative standard deviations (RSDs) ranged from 0.7% to 11.6% (=6). The method, with wide matrix range of application, is highly effective and sensitive and suitable for the rapid analysis of large quantities of samples.