Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 397, Issue 7, Pages 2841-2849Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-010-3660-5
Keywords
Veterinary drugs; Milk; Turbulent flow; Screening; Tandem mass spectrometry
Funding
- Dutch Ministry of Agriculture, Nature and Food Quality [7261201]
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There is an increasing interest in screening methods for quick and sensitive analysis of various classes of veterinary drugs with limited sample pre-treatment. Turbulent flow chromatography in combination with tandem mass spectrometry has been applied for the first time as an efficient screening method in routine analysis of milk samples. Eight veterinary drugs, belonging to seven different classes were selected for this study. After developing and optimising the method, parameters such as linearity, repeatability, matrix effects and carry-over were studied. The screening method was then tested in the routine analysis of 12 raw milk samples. Even without internal standards, the linearity of the method was found to be good in the concentration range of 50 to 500 A mu g/L. Regarding repeatability, RSDs below 12% were obtained for all analytes, with only a few exceptions. The limits of detection were between 0.1 and 5.2 A mu g/L, far below the maximum residue levels for milk set by the EU regulations. While matrix effects-ion suppression or enhancement-are obtained for all the analytes the method has proved to be useful for screening purposes because of its sensitivity, linearity and repeatability. Furthermore, when performing the routine analysis of the raw milk samples, no false positive or negative results were obtained.
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