Determination of ochratoxin A in brewing materials and beer by ultra performance liquid chromatography with fluorescence detection
2011
Běláková, Sylvie | Benešová, Karolína | Mikulíková, Renata | Svoboda, Zdeněk
In 2008–2009 the total set of 237 samples of malting barley, malt, hop, wort, and beer was analysed for ochratoxin A (OTA) contamination using the ultra performance liquid chromatography (UPLC) coupled to fluorescence detection (FLD). The UPLC method is a fast technique withlow limits of detection and quantification (LOD and LOQ) compared to other methods used routinely. LOD and LOQ values were 0.0003 and 0.001ng/ml for beer, 0.05 and 0.2μg/kg for barley and malt, 0.16 and 0.5μg/kg for hop, respectively. Ochratoxin A was detected in one barley sample (0.3μg/kg), one malt (0.7μg/kg) and one hop sample (0.6μg/kg). OTA content was also determined during the brewing process. In addition, samples of both domestic and foreign beers, obtained from local stores, were analysed. OTA content was determined in 39% of beer samples, the detected OTA level ranged from 0.001 to 0.0544ng/ml. Only one beer sample contained 0.2438ng/ml OTA.
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