Schlüsener MP, Spiteller M, Bester K. Determination of antibiotics from soil by pressurized liquid extraction and liquid chromatography-tandem mass spectrometry.
J Chromatogr A 2003;
1003:21-8. [PMID:
12899294 DOI:
10.1016/s0021-9673(03)00737-4]
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Abstract
A method for the analysis of several macrolide and ionophore antibiotics, as well as tiamulin, from soil was developed using pressurized liquid extraction (PLE), reversed-phase liquid chromatography and atmospheric pressure chemical ionisation (APCI) tandem mass spectrometry (LC-APCI+-MS-MS). The analytes were extracted from soil by PLE in 30 min and the extracts were cleaned up by solid-phase extraction (SPE) on a diol SPE cartridge. Liquid chromatographic (LC) separation of the antibiotics was achieved in 35 min. Recovery experiments were performed using spiked soil and concentrations varying from 1 to 2000 microg/kg. By using a macrolide internal standard the recovery rates for the macrolides erythromycin and roxithromycin ranged from 43 to 94% (RSD 20-23%), for the ionophore salinomycin the recovery rate was 76% (RSD 29%), while the pleuromutilin tiamulin was completely recovered. The limits of detection ranged from 0.2 to 1.6 microg/kg. In soil samples a maximum concentration of 0.7 microg/kg tiamulin was found.
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