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Adduct of 40.5Da

http://www.chromforum.org/viewtopic.php?t=1787

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Adduct of 40.5Da

Posted: Mon Apr 11, 2005 11:57 am
by fabienco
I can see an adduct of 40.5Da on the molecule I am analysing.
Has anybody seen this before?
Thank you.

Posted: Mon Apr 11, 2005 1:31 pm
by HT
41 Da is usually Acetonitrile.

Posted: Mon Apr 11, 2005 1:36 pm
by MG
Can you distinguish the A+1 (carbon-13) peak for the adducted molecule? If so, is it 1m/z or 0.5m/z higher? This will tell you if that ion is doubly charged or not. The fact that you see the adduct as 40.5 makes it sound like it could be doubly charged.

Posted: Tue Apr 12, 2005 3:54 pm
by fabienco
I can see the A+1 (C13), the adduct is related to the mean peak as I can see it when I select the mean peak in the ion trap for MS/MS experiment.
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