alexa Determination of antibiotics from soil by pressurized liquid extraction and liquid chromatography-tandem mass spectrometry.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Schlsener MP, Spiteller M, Bester K

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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.
This article was published in J Chromatogr A and referenced in Pharmaceutica Analytica Acta

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