Nonlinear Dynamics: A Waters Company

UK: +44 191 230 2121
USA: +1 919 806 4401
info@nonlinear.com

Progenesis QI

The next generation in LC-MS data analysis software.
Discover the significantly changing compounds in your samples.

Download

How do I use the Review Deconvolution screen?

After peak picking, ions that are found to be different adduct forms of the same compound are grouped; this process is called deconvolution. Once you've found the interesting compounds in your samples*, you may want to gain confidence in their validity by reviewing — and optionally editing — the deconvolution; this is where the Review Deconvolution screen can help.

Understanding the screen

When using the Review Deconvolution screen, you review a single compound at a time; select the compound in the list at the left and then use the visualisations in the rest of the screen to check for:

  • co-eluting adduct forms that were incorrectly left out of the selected compound
  • co-eluting ions that were incorrectly grouped as part of the selected compound

The visualisations that help in this process are the deconvolution matrix (upper half of the screen) and the mass spectra and chromatograms (lower half):

The different parts of the Review Deconvolution screen

Typically, you'll use the deconvolution matrix first, looking for any obvious problems. If you're uncertain about the any ion, you then check to see whether the mass spectrum and chromatogram for that ion match the other ions in the compound.

If you then decide that the compound needs an ion adding to it (or removing from it), simply right-click on the ion outline shown in the matrix to edit the grouping.

Further information

* Given that an experiment may have many thousands of compounds, it's likely that you'll want to do this for only the compounds of experimental interest.