In this paper, a procedure for the determination of aflatoxin B1, B2, G1 and G2 in five different animal
feedstuffs, intended to feed different mammalians and fowls, has been developed and validated. The
method is based on a very simple solideliquid extraction with acetonitrile and subsequent analysis by
high performance liquid chromatography coupled with fluorescence detection with post-column
photochemical derivatization. The study carried out to optimize the extraction step, showed that using
acetonitrile as extraction solvent provided not only satisfactory recoveries, but also extracts clean
enough to omit a further clean up step. The method has been fully validated on five different matrices,
and limits of quantification were below the allowed or recommended levels by European Union. Recovery
studies were carried out at three different concentration levels, with values ranging from 81 to
105%; repeatability and intermediate precision showed relative standard deviations lower than 10% in all
cases.