Determination of daptomycin in human plasma by liquid chromatography-tandem mass spectrometry. Clinical application

作者：Verdier Marie Clemence; Bentue Ferrer Daniele^*; Tribut Olivier; Collet Nicolas; Revest Matthieu; Bellissant Eric

来源：Clinical Chemistry and Laboratory Medicine, 2011, 49(1): 69-75.

DOI：10.1515/CCLM.2011.005

• daptomycin
• liquid chromatography-tandem mass spectrometry
• therapeutic drug monitoring

Background: Daptomycin is a recently developed cyclic lipopeptide antibiotic active against most Gram-positive pathogens including vancomycin-resistant enterococci and methicillin-resistant Staphylococcus aureus. To optimize treatment efficacy and safety, especially in patients undergoing multiple drug regimens and/or co-morbidities, a specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method was developed for the quantification of daptomycin in plasma.
Methods: A C18 column was used for separation, with a mobile phase initially consisting of 0.1% formic acid, water, and acetonitrile (ACN) in a linear gradient from 20% to 70%. After protein precipitation with ACN, the clear upper layer was diluted in water: ACN (50:50, v/v) before injection. Detection was performed using an electrospray ionization technique. MS/MS transitions, monitored in the positive ion mode were m/z 811.1 -> m/z 313.1 for daptomycin, and m/z 609.4 -> m/z 194.9 for reserpine, used as internal standard.
Results: Elution of daptomycin and reserpine occurred at 4.5 and 3.9 min, respectively. The method was validated over a range of concentrations from 1 mg/L to 120 mg/L. The assay met recommended acceptance criteria: coefficients of variation were <6.3% and <7.4%, and accuracies were between -5.9% and +11.2% and between -3.5% and +3.7%, for intra- and inter-day validations, respectively.
Conclusions: This method appears well-adapted to routine hospital practice for therapeutic drug monitoring of daptomycin considering its time of analysis, range of concentrations measured, precision and accuracy.

• 出版日期2011-1