A rapid multiclass method for antibiotic residues in goat dairy products by UPLC-quadrupole/electrostatic field orbitrap high-resolution mass spectrometry

Background Sulfanilamides, quinolones, nitroimidazoles, tetracyclines, cephalosporins, macrolides, and beta-lactam are common tools in agriculture and can be found in animal-based foods such as goat milk and goat dried milk. To evaluate the risk of these species, reliable analytical methods are needed for accurate concentration determination, especially in goat milk and goat dried milk. Method We describe a method based on PRiME extraction coupled with UPLC-quadrupole/electrostatic field orbitrap high-resolution mass spectrometry to accomplish this task. Result Under optimal conditions, the limit of quantification for all antibiotics was 0.5-100 mu g/L in goat milk and goat dried milk samples. The recoveries were 60.6-110.0% for goat milk and 60.1-109.6% for goat dried milk with a coefficient of variation less than 15%. The detection limits were 0.5-1.0 mu g/kg. The limits of quantification for the analytes were 5.0-10.0 mu g/kg. Finally, the method was used to screen veterinary antibiotics in 50 local goat milk and goat dried milk samples; metronidazole and enrofloxacin were detected in goat milk. Conclusion This method offers good reliability and the capacity for simultaneous detection can be used to detect residual contents and evaluate health risks in goat milk and goat dried milk.