Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 21, Issue 5, Pages 864-867Publisher
SPRINGER
DOI: 10.1016/j.jasms.2010.01.023
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We have developed a new internal standard method for the determination of the concentration of captopril (CAP) through surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS) using gold nanoparticles (Au NPs). This approach provided linearity for CAP over the concentration range 2.5-25 mu M (R-2 = 0.987), with a limit of detection (signal-to-noise ratio = 3) of 1.0 mu M. The spot-to-spot variations in the concentration of CAP through SALDI-MS analyses performed in the absence and presence of the internal standard were 26% and 9%, respectively (15 measurements). This approach provides simplicity, accuracy, precision, and great reproducibility to the determination of the levels of CAP in human urine samples. (J Am Soc Mass Spectrom 2010, 21, 864-867) (C) 2010 American Society for Mass Spectrometry
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