To validate a modified version of AOAC o$cial method of analysis 995.10 as an o$cial standard in Japan for determination of patulin in apple juice, an inter-laboratory study was performed in 11 laboratories using a non-contaminated sample, 2 naturally contaminated samples and 2 spiked samples of apple juice. For naturally contaminated apple juices, the relative standard deviations for repeatability and reproducibility were 3.2, 7.1ῌ and 10.0, 21.7ῌ, respectively. HORRAT values were 0.4, 0.9. The average recovery of patulin from spiked sample was 83.7ῌ. The limit of quantification was calculated as 10 mg/kg. From these results, the method was thought to be suitable as an o$cial standard for determination of patulin in apple juice in Japan.
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