again by vortex for 2 min. Agilent SampliQ EN QuEChERS extraction
kit (4 g MgSO4, 1 g NaCl, 1 g sodium citrate and 0.5 g disodium
hydrogen citrate sesquihydrate) was added and the tube was
quickly shaken vigorously for 1 min. After that, the sample was
centrifuged at 4500 rpm for 5 min.
Then, 2 mL of the upper MeCN layer was transferred to a vial,
evaporated to near dryness under a gentle stream of nitrogen
and reconstituted with 1 mL of MeOH:H2O (50:50, v/v). The samples
were filtered with a 0.2 lm filter before injection and the 10
mycotoxins were determined by UHPLC–MS/MS.
3.1. UHPLC–MS/MS analysis
The chromatographic method used for the determination of the
selected mycotoxins was similar to the one previously developed
and applied in our laboratory (Arroyo-Manzanares, García-
Campaña, & Gámiz-Gracia, 2013). UHPLC separations were performed
in a C18 column (Zorbax Eclipse Plus RRHD 50 2.1 mm,
1.8 lm) using a mobile phase consisting of 0.3% aqueous formic acid
solution with 5 mM ammonium formate (solvent A), and MeOH