protonated molecule

(redirected from protonated molecular ion)

protonated molecule

In mass spectrometry, an ion formed by adding a proton to a neutral molecule, which is designated as M H.
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Since the signal intensity of the sodium ion adduct of glibenclamide was better than the signal intensity of protonated molecular ion. Method was successfully validated for glibenclamide estimation in multiple reaction monitoring mode.
Metabolite M3 with a retention time of 3.898 min and a formula of [C.sub.15][H.sub.20][O.sub.3] was observed as protonated molecular ion [[M + H].sup.+] at m/z 249 which was 16 Da higher than the protonated ion of alantolactone, indicating that M3 was an epoxide of alantolactone.
To ensure that matrix effects were not obscuring peaks, we verified that the protonated molecular ion of the 5 internal standards, which spanned the retention time of interest, were present at the expected retention time.
In the case of C96H56N16O8Zn 2 complex mainly protonated molecular ion peak was observed.
Peak 3 produced a protonated molecular ion at m/z 350.1 [[M + H].sup.+], fragment ions at m/z 333.0 [[M - N[H.sub.3]].sup.+], 192.0, 174.0, 160.0, and 106.1 in [ESI.sup.+] mode.
The most feasible structures of product ions for the MS/MS spectrum of the protonated molecular ion, m/z 154, of D are depicted in Fig.
The collision-induced dissociation (CID) spectrum of m/z 130, which corresponds to the protonated molecular ion of the racemic PA mixture, is shown in Fig.
This spectrum was acquired by transmitting the protonated molecular ion via [Q.sub.1] and scanning the second resolving quadrupole, [Q.sup.3], for products resulting from fragmentation in the collision cell.
Both of these spectra were acquired by [Q.sub.1] transmission of the protonated molecular ion, m/z 231, and scanning the second resolving quadrupole ([Q.sub.3]) for products resulting from fragmentation in the collision cell.
This spectrum was acquired by transmitting the protonated molecular ion via [Q.sub.1] and scanning the second resolving quadrupole ([Q.sub.3]) for products resulting from fragmentation in the collision cell.
By performing MS/MS in the ion trap, we can first isolate the benzoylecgonine protonated molecular ion (290 m/z) and then perform CID in the trap, with the knowledge that any resulting product ions originated from the 290 m/z ion.