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Gas chromatography mass spectrometry (GC-MS) has found many applications for the quantitative determination of compounds of pharmacological interest in biological fluids 4 ]. With quantitative mass spectral methods, also referred to as mass fragmentography, selected ion monitoring, multiple ion detection or multiple peak scanning [5 ], a high degree of sensitivity and specificity can be obtained to enable quantitative analyses at low levels without interference from natural constituents of biological origin. Modern GC-MS systems can be equipped with hardware devices and software packages for control of the mass spectrometer by a datasystem to facilitate the quantitative analyses..However, processing of large series of biological samples is still hindered because the standard software is of little further assistance to the user once raw mass spectral data for quantitative analyses are obtained and converted into gas chromatographic retention times, peak heights and areas at the masses monitored. The user has to struggle through the cumbersome selection of the gathered data, calculate a calibration function and check the obtained calibration before being able to obtain quantitative measurements. It is clear that this approach is not well suited for performing quantitative GC-MS analyses in a routine way. In this paper the authors describe the extension of the Varian SpectroSystem lOOMS software for routine quantitative analysis of drugs in plasma using a GC-MS system operated under control of the Varian SpectroSystem 100MS.

Flexible data handling for routine quantitative analyses employing a gas chromatograph-mass spectrometer under computer control