Abstract
A sensitive and selective liquid chromatography–triple quadrupole–tandem mass spectrometry (LC–ESI–MS–MS) method was developed for the routine analysis of aflatoxins (AFB1, AFB2, AFG1 and AFG2) and ochratoxin A (OTA) in tiger nuts and tiger-nut beverage (horchata). A matrix solid phase dispersion was adapted to eliminate lipidic interferences. The solid support was C18, while the elution solvent was acetonitrile. Mean recoveries obtained at two fortification levels were 72–83% and 71–81% for horchata and tiger nut respectively with relative standard deviations (RSDs) <13% and 15% respectively. The LC–MS–MS method allowed quantification and identification at low levels in two matrices. The method was applied for the routine analysis of tiger-nuts and horchata samples collected from different supermarkets of Valencia (Spain) during one year (March 2009–March 2010). A total of 238 samples were analysed and 32 samples were found positives for OTA, AFB1, AFB2 and AFG2.
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