my GC spectrum showed the present of solvent but during analysed with GC-MS the solvent peak and solvent non-detect. My essential oil that been analysed was extracted from sweet basil leave by steam distillation method.
Dear Beh Meng
In GC -MS analysis there are a pre run time near 4 minutes in this time all solvents could evaporates and exit from column and do not enter to the mass system.
Hi, did you do GC-MS with the same conditions as you did with GC (FID? or other detectors?)?; Did you apply TIC (Total Ion Monitoring) or SIM (Selected Ion Monitoring) for your GC-MS? Did you observed the peaks (of essential oil) as you worked with GC-MS? Best regards
Hi Beh-Meng,
It is most likely that you had a solvent delay on your GC-MS method. This solvent delay time means that the detector doesn't start working until after some time and this allows the solvent to pass through the column without detection. It is to preserve the life of the detector.
Dear Beh Meng,
I agree with Nicholas. Almost sure, your GC-MS method has a solvent delay (usually 3 minutes). You can check this by looking the start time in the TIC: you will see that the register does not start at 0 min but just after the solvent delay. The solvent delay is a general practice in GC-MS analysis to protect the MS detector. Best regards.
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