Determination of Decoquinate in Feeds

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Abstract
The coccidiostat decoquinate is used in poultry feeds at 0.003%. Its fluorescence in alcoholic solution is greatly enhanced by the presence of calcium, magnesium, or strontium. A method was tested collaboratively in which decoquinate is extracted from feed by shaking with 1% calcium chloride-methanol solution, water and acid are added, and the decoquinate is trans-ferred into chloroform and chromatographed on Florisil to separate interferences. It is eluted with the calcium chloride-methanol and determined by fluorescence measurement. Background interference is negligible. Results by nine collaborators were in good agreement with the formulated drug content of feeds. The method is recommended for adoption as official, first action.

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