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KMID : 0380620110430030277
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Korean Journal of Food Science and Technology
2011 Volume.43 No. 3 p.277 ~ p.281
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Determination of Ethylenethiourea in Fruits
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Kim Eun-Hee
Jang Mi-Ra
Kim Jin-A
Kim Tae-Rang
Yuk Dong-Hyun
Hwang In-Sook
Kim Jung-Hun
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Abstract
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A rapid and very sensitive high-performance liquid chromatography/atmospheric-pressure chemical-ionization mass spectrometry method to detect ethylenethiourea (ETU) fungicide residues in fruits was developed. Methylene chloride was used as the surface extraction solvent for the target component. Recovery rates improved when cysteine hydrochloride and sodium carbonate were added to product prior to fortification. The limits of detection and quantification were approximately 0.006 and 0.02 mg/kg, respectively, from mandarin oranges. Recoveries from mandarin oranges, oranges, bananas, and pears, spiked in the range of 0.05-0.5 mg/kg, averaged 80-100%. The proposed method was used to monitor the presence of ETU in commercial fruits purchased from different markets in Seoul, Korea. ETU was found in four orange peels and in three mandarin orange peel samples. The highest ETU residue levels were 73.6 μg/kg and 29.8 μg/kg.
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KEYWORD
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dithiocarbamates, ETU, ethylenethiourea
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