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Abstract
Zeranol, fraudulently used for the purpose of cattle fattening can be differentiated from the natural presence of zearalenone resulting from food animal contamination. High performance liquid chromatography and ultraviolet spectrophotometric detection are proposed to separate and to quantify these two substances and their main metabolities. Veal urine sampoes containing zeranol have been analyzed. A mathematical solution is suggested to overcome the difficulty of an inevitable chromatographic interference.