Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
SHR Neuro Krebs Kardio Lipid Stoffw Microb
Köfeler, HC; Gross, ML.
Correction of accurate mass measurement for target compound verification by quadrupole time-of-flight mass spectrometry.
J AMER SOC MASS SPECTROM. 2005; 16(3): 406-408.
Doi: 10.1016/j.jasms.2004.11.022
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- Köfeler Harald
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- Abstract:
- The aim of this work is to evaluate quadrupole/time-of-flight (QTOF) mass spectrometry for simultaneous measurement of accurate mass and quantification of a target by using a stable isotopically labeled internal standard. Mixtures of caffeine and (13)C(3)-caffeine (internal standard) at different concentration ratios were analyzed by capillary HPLC/QTOF. A calibration plot for quantification is linear over a factor of 20. Without invoking any correction scheme, the mass accuracy seriously degraded when the ratio of the mass standard to the test compound was not unity. The accuracy could be restored to approximately 2 ppm by using a quadratic function to correct the measured mass as a function of the measured signal ratio of target and internal calibrant.
- Find related publications in this database (using NLM MeSH Indexing)
- Caffeine - analysis
- Carbon Isotopes - analysis
- Chromatography, High Pressure Liquid - analysis
- Spectrometry, Mass, Electrospray Ionization - methods