Obejective: To develop a method for the determination of 13 antibiotics in 8 classes for desinfection products by ulta-high perfomance chromatography-tandem mass spectrometry(UPLC-MS/MS).
Methods: Samples were extracted by methanol or acetonitrile. The target compouds were separated on a Waters HSS T3 column(100 mm×2. 1 mm, 1. 8 μm), and detected by triple quadrupole tandem mass spectrometer.
Results: The 13 selected antibiotics showed good linear relationships in the range of 4-100 μg/L and the correlation coefficients(r~2) were all above 0. 991. The limits of detection ranged from 2 to 25 μg/kg. The recovery rates at three spiked levels(low, medium and high) in three dosage forms of disinfection products were in the range of 71. 2%-130. 4%, and the relative standard deviations(RSD) were all less than 11. 3%, which could meet the detection requirements of illegal addition of antibiotics in disinfection products. Ofloxacin at a concentration of 21. 1 mg/kg was found in a cream disinfection product by the developed method, and no related drugs were detected in other samples.
Conclusion: This method is simple, reliable, reproducible, which covers a wide range of antibiotics, and provides technical support for monitoring the illegal addition of antibiotics in disinfection products.
Keywords: antibiotics; disinfection products; ulta high perfomance chromatography-tandem mass spectrometry.