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<blockquote><div class="quotetitle">Quote from <a class="profile-link highlight-admin" href="https://ucphchemometrics.com/forum/profile/beaqc/">Beatriz Quintanilla</a> on February 6, 2023, 3:50 pm</div>Hello!

We advise you to get the full NIST library, since the demo version is not comprehensive enough and that could hinder the identification of some compounds. We assume the models calculated are good, but the identification step fails for that reason. In the meantime, you can check manually if the average spectrum modelled in PARADISe for each of those compounds match the ones available at the online version of the NIST library.

Note that, in any case, the identification of terpenes (alpha pinene, gamma terpinene) is tricky because their mass spectra are very similar, usually presenting the same main ions and maybe some slight differences on the intensity ratio. In your case, the use of internal standard allows to confirm which terpene is expected to find.

I hope this helps!

Best,

Beatriz</blockquote><br>

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