Monitoring of 49 Pesticides and 17 Mycotoxins in Wine by QuEChERS and UHPLC-MS/MS Analysis

An effective method for the determination of 49 pesticide residues and 17 mycotoxins in wine by a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) method and ultrahigh-performance liquid chromatography-tandem mass spectrometry was developed. The target compounds were extracted with 1% (v/v) formic acid-acetonitrile, and no cleanup steps were required. The extracts were separated on a C18 chromatographic column (2.1 mm x 50 mm, 1.7 mu m) with acetonitrile and water with 0.2% formic acid solution and ammonium acetate (10 mM) as the mobile phases under gradient elution at a flow rate of 0.2 mL/min. The determination was conducted using electrospray ionization in positive ion mode with multiple reaction monitoring. The analytes were quantified by comparison with matrix-matched standard solutions. The good linearities were obtained in the range of 0.05 to 500.0 mu g/kg, and the correlation coefficients were all greater than 0.9935. The average recoveries of the 66 target compounds ranged from 69% to 119%, and the RSDs were in the range of 1% to 10%. The limits of detection were in the range of 0.05 to 20.0 mu g/kg. The method was proved to be rapid, selective, sensitive, and stable, and it has been applied to analysis of 64 wine samples.