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A liquid chromatography—mass spectrometry (LC—MS) method for the simultaneous determination of salbutamol, ractopamine, and clenbuterol in commercial feeds was developed. Samples were extracted with phosphoric acid—methanol solution, and further clean-up was achieved with a C18 cation exchange mixed mode cartridge. Separation of analytes was developed on a C18 column with 0.01M aqueous ammonium formate solution (pH 3.8)—acetonitrile by gradient program, and characterized by LC—MS on a quadrupole detector, in electrospray positive ion mode. This method provides average recoveries for salbutamol, ractopamine, and clenbuterol of 83–110% and coefficients of variation of 1.5–11% in feeds spiked in the range of 0.5–500 mg/kg. The limits of detection and quantification in feeds were 0.01 mg/kg and 0.05 mg/kg, respectively. Such limits are well below the dose of 2–25 mg/kg feed proposed as effective.

Simultaneous Determination of Salbutamol, Ractopamine, and Clenbuterol in Animal Feeds by SPE and LC—MS