precursor ion

precursor ion

In mass spectrometry, the ion that dissociates to a smaller fragment ion, usually due to collision-induced dissociation in an multistage/mass spectrometry (MS/MS) experiment.
References in periodicals archive ?
The CID spectra obtained by this approach are less reproducible because (a) it does not involve precursor ion selection and (b) there are many factors that can influence fragmentation of ions in the source such as source gas pressure, source voltages, coeluting compounds, neutral particles, temperature, and solvents.
The system will provide the capability to separately isolate and fragment more than 5 precursor ions for each full-scan profile and will provide the capability to isolate the precursor ion in the range m/z 50-4 000.
The analysis was performed in positive ion mode electrospray ion (ESI-MS) source and precursor ion scans m/z 264 and 282 and multiple reaction ion monitoring (MRM) mass transition m/z 564/282 (ceramides), and precursor ion scan m/z 184 lysophosphocholine (LPC), were used.
PREMIER Biosoft's SimLipid augments the Waters UPLC -- HDMSe (ion mobility -- mass spectrometry) data by performing an exact mass precursor ion search to generate a list of lipid candidates which are then ranked by comparing diagnostic product ions observed in the high energy HDMSe data and structure specific in-silico fragment ions from the SimLipid database.
2) A tandem mass spectrometer has two mass selective devices (quadrupoles) arranged in a series that selects the precursor ion (of a particular m/z) of the respective analyte, which is then directed into a collision cell where a very low flow of a collision gas is responsible for the disintegration of the precursor ions into several product ions.
The precursor ion automatic selection measurement mode conducts MS, [MS.
Precursor ion scanning was performed by setting the first quadrupole to scan a specified mass range and the third quadrupole was set to scan m/z 158 while the second quadrupole was used as a collision cell.
co-eluting analytes) can prohibit detection of a precursor ion in a data-dependent analysis.
Therefore, fragmentation data are collected for every precursor ion and are not limited by the number of MS/MS scans that can be performed in a single run.
Unlike traditional acquisition approaches, this technique does not rely on precursor ion mass detection to trigger MS/MS acquisition.
0 as the precursor ion, which were formed by clearage on the glycoside of D ring (Li et al.
They include product ion scans to detect expected metabolites, as well as precursor ion scans and neutral loss scans to detect both expected and unexpected metabolite ions.