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  • Title: Gas-liquid chromatographic method for determining ethylenethiourea in potatoes, spinach, applesauce, and milk: collaborative study.
    Author: Onley HH.
    Journal: J Assoc Off Anal Chem; 1977 Sep; 60(5):1111-5. PubMed ID: 578148.
    Abstract:
    Eight laboratories collaboratively tested a gas-liquid chromatographic method for determining ethylenetiourea (ETU) in potatoes, spinach, applesauce, and milk. In the determinative step, ETU is converted to the S-butyl derivative (2-n-butylmercapto-2-imidazoline) which is detected by a flame photometric detector, sulfur mode. For unknown fortification levels of 0.06, 0.12, and 0.30 ppm, the collaborators reported an overall average recovery range of 85-97% in the various commodities. The method has been adopted as interim official first action.
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