parent ion

parent ion

Precursor ion, see there.
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It was found that the intensity of acylcarnitine peaks significantly increased at acetonitrile concentration of 90% and above, but this resulted in peaks appearing in acylcarnitine profiles, specifically at m/z 302, this can result in a misinterpretation of the blood acylcarnitine profile as the same ion with an m/z of 302 appears as isovaleryl-/valerylcarnitine parent ion, which is increased in patients suffering of isovaleric acidemia (OMIM 243500) an autosomal recessive disorder of leucine catabolism caused by reduced activity of isovaleryl-CoA dehydrogenase (18).
Additionally, ions corresponding to the core plus one or two bipyridine ligands are also observed, while the parent ion is not.
In this procedure, the parent ion was selected with the first quadrupole and passed into the second quadrupole containing argon gas.
The mass of the parent ion serves as sufficient proof of the identity of simple hydrocarbon radicals.
The daughter scan mode may select a parent ion characteristic of the analyte with the first mass analyser, fragmenting it by CID, and scanning the second mass analyser to obtain a daughter spectrum.
As previously described (12), each EPI spectrum was composed of fragments generated from the same parent ion at 3 different collision energies within a single scan, resulting from the accumulating property of the LIT and the new collision energy spread feature of the software (see Fig.
Both the parent ion of PbTx-3--896 Da--and two daughter ions--878 Da and 724 Da--all with identical retention times, were monitored to confirm the presence of PbTx-3.
ESI-MS/MS parent ion scans for the GALC assay performed with a single 2-mm dried blood spot as well as a control assay containing a 2-mm blood-free paper disk are shown in Fig.
1]) scan shows a small parent ion peak at m/z 198, which is the expected [M+1] ion, and a larger peak at m/z 180 corresponding to loss of [H.
Parent ion scans of 85 Da were produced by scanning M51 from m/z 255-550 while focusing M52 on a single common product ion at m/z 85 produced by all acylcarnitine butyl esters.