Quantitative determination of the Fusarium mycotoxins beauvericin, enniatin A, A1, B and B1 in pig plasma using high performance liquid chromatography-tandem mass spectrometry.

A sensitive and reliable method was developed for the identification and quantification of beauvericin, enniatin A, A1, B and B1 in pig plasma using liquid chromatography combined with heated electrospray ionization tandem mass spectrometry. Sample clean-up consisted of a deproteinization step using acetonitrile, followed by evaporation of the supernatant and resuspension of the dry residue in acetonitrile/water (80/20, v/v). The method was in-house validated: matrix-matched calibration graphs were prepared for all compounds and correlation and goodness-of-fit coefficients ranged between 0.9980 and 0.9995 and between 5.2% and 11.3%, respectively. The within- and between-run precision and accuracy were evaluated and the results fell within the ranges specified. The limits of quantification were 0.1 ng/mL for enniatin A and A1 and 0.2 ng/mL for beauvericin, enniatin B and B1, whereas limits of detection were ≤ 10 pg/mL for all analytes. The method has been applied for the analysis of real plasma samples from one pig that received an oral bolus (0.05 mg/kg BW) of the investigated mycotoxins. At the applied dosage, the results indicated the suitability of the method for use in toxicokinetic studies with enniatins.