• Korean Journal of Food Science and Technology
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• v.43 no.6
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• pp.702-710
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• 2011

The occurrence of aflatoxins $B_1$, $B_2$, $G_1$ and $G_2$ in nuts, their products and dried fruits was investigated. Samples were collected from local markets in Seoul and analyzed by rapid resolution liquid chromatography coupled with tandem mass spectrometry using an immunoaffinity column. The chromatography method was validated for assay of aflatoxins using linearity, accuracy, precision and limit of detection and quantification. The linearity in the concentration ranged from 0.10 to $20{\mu}g/kg$ with $R^2$ > 0.9999. Sample recoveries ranged from 71.1 to 97.2% with relative standard deviations below 4.5% for spiking levels from 1 to $10{\mu}g/kg$. The limits of detection ranged between 0.02 and $0.05{\mu}g/kg$ and the limits of quantification ranged between 0.05 and $0.10{\mu}g/kg$. The levels of aflatoxin $B_1$, $B_2$, $G_1$ and $G_2$ in nuts, their products and dried fruits were $B_1$ 0.10 to $9.94{\mu}g/kg$, $B_2$ 0.08 to $1.54{\mu}g/kg$, $G_1$ 0.04 to $3.21{\mu}g/kg$ and $G_2$ 0.06 to $0.14{\mu}g/kg$.