en
Scientific article
English

Method development aspects for the quantitation of pharmaceutical compounds in human plasma with a matrix-assisted laser desorption/ionization source in the multiple reaction monitoring mode

Published inRCM. Rapid communications in mass spectrometry, vol. 21, no. 6, p. 911-919
Publication date2007
Abstract

The present work investigates various method development aspects for the quantitative analysis of pharmaceutical compounds in human plasma using matrix-assisted laser desorption/ionization and multiple reaction monitoring (MALDI-MRM). Talinolol was selected as a model analyte. Liquid-liquid extraction (LLE) and protein precipitation were evaluated regarding sensitivity and throughput for the MALDI-MRM technique and its applicability without and with chromatographic separation. Compared to classical electrospray liquid chromatography/mass spectrometry (LC/ESI-MS) method development, with MALDI-MRM the tuning of the analyte in single MS mode is more challenging due to interfering matrix background ions. An approach is proposed using background subtraction. With LLE and using a 200 microL human plasma aliquot acceptable precision and accuracy could be obtained in the range of 1 to 1000 ng/mL without any LC separation. Approximately 3 s were required for one analysis. A full calibration curve and its quality control samples (20 samples) can be analyzed within 1 min. Combining LC with the MALDI analysis allowed improving the linearity down to 50 pg/mL, while reducing the throughput potential only by two-fold. Matrix effects are still a significant issue with MALDI but can be monitored in a similar way to that used for LC/ESI-MS analysis.

Keywords
  • Algorithms
  • Blood Chemical Analysis/instrumentation/methods
  • Equipment Design
  • Equipment Failure Analysis
  • Humans
  • Microchemistry/instrumentation/methods
  • Pharmaceutical Preparations/blood
  • Propanolamines/blood
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Spectrometry, Mass, Electrospray Ionization/instrumentation/methods
  • Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/instrumentation/methods
Citation (ISO format)
KOVARIK, Peter et al. Method development aspects for the quantitation of pharmaceutical compounds in human plasma with a matrix-assisted laser desorption/ionization source in the multiple reaction monitoring mode. In: RCM. Rapid communications in mass spectrometry, 2007, vol. 21, n° 6, p. 911–919. doi: 10.1002/rcm.2912
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ISSN of the journal0951-4198
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