Hi,
I am using the Masshunter software to quantify my GC-MS data.
So, did the integration using MassHunter. but the data (area) are weird. I have a lot of peaks in one chromatogram, therefore, when choosing a specific retention time for a compound, the program picks up other peaks which are not the ones I want. This is because some peaks have overlaps with other peaks (that are not the same compound) but the program takes them anyway because at the exact or close RT they are there!
I think it might also be because of the fact that the spectra of the peak is not fully visualized in Masshunter. Sometime you will se e only a part of the spectra and that is the only option you can take.
Please let me know if you have experienced the same issue and let me know how did you solve it.
Will appreciate your suggestions.
Mah
If the peaks are not baseline resolved, then you can not expect to obtain quantitative data or results. Computer integration is directky affected by the quality of the data obtained. Go back and re-develop a better GC method which isolates and resolves your peaks ( look for unique ions ). If possible, compare your sample peaks to a pure standard(s) too.
*Have someone with training in GC-MS method development assist you on-site. In doing so, you will learn more from the experience and improve your chances of acquiring accurate data.
Don't you have, beside the retention time and the MS of the peak, the MS of some reference ? Doing so, you can compare and check if the component is the same with the same MS than the one you are supposed to find. Sometime the software take another peak because it think that, since the area is bigger, it should be the one. The software has an option for you to change to say "Ok, the time retention should be X minutes and X seconds, but you can look from -5 seconds to +5 seconds", and doing so, the software will look at that range of time and not only at a specific Tr
Thank you all for your answers. Can we do deconvolution with MassHunter or the GC analyzer itself? Also, William, it is true that I have too many peaks but the problem mostly comes from the other samples at a close retention time with peaks which don't show the same spectra. So, is there any alternative way instead of redoing a lot of samples?
and Durli, I have changed the retention time window for integration it basically looked for the compound 0.2 min from each side with my current data. Don't you think 5 sec will cause many compound loss?
Best,
Mah
Mahboheh, no because usually, with a good data base, you are supposed to have the same retention time if you use the same column and the same gradient.
That's the difficulty, having a strong database in the same condition than your experience
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