Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1058, Issue 1-2, Pages 137-142Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.07.101
Keywords
dihydrostreptomycin; streptomycin; milk; honey
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Two liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods were developed for the determination of streptomycin (STR) and its derivative dihydrostreptomycin (DHSTR) in milk and honey. These aminoglycoside antibiotics are used as veterinary drugs. In the EU, the presence of dihydro- and streptomycin residues in honey is forbidden, the maximum residue level (MRL) in milk is 200 mug/kg. The methods were optimised with regard to sensitivity and chromatographic efficiency, and validated by a procedure consistent with EU directive 2002/657. Average recoveries and accompanying standard deviations were satisfactory. The limit of quantification of STR was 2 mug/kg in honey and 10 mug/kg in milk, of DHSTR it was a factor two lower. The precision of the milk analysis was improved by using STR as the internal standard for DHSTR and vice versa. In a survey of 186 honeys available on the Dutch market, 26% of the honeys of foreign origin were positive for (DH)STR. This occurence rate was consistent with previous surveys, but lower concentrations were found. (C) 2004 Elsevier B.V. All rights reserved.
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