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.
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The second set acts as a collision cell to fragment this precursor ion, while the third filters the resulting fragment ions, allowing only specific daughter ions to reach the detector.
The P/R ratio is defined as the AUC of a specific precursor ion (P) divided by the AUC of a reference ion (R) within the same sample.
Combining quadrupole precursor ion selection with HRAM Orbitrap mass analyzer technology, the system delivers mass accuracy, sensitivity and fast polarity switching, while maintaining sensitivity.
For precursor ion selection, all fractions were measured in single MS before MS/MS was performed.
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.
This process enables unique mass spectrometry such as precursor ion scans and neutral loss scans.
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.
Unlike traditional acquisition approaches, this technique does not rely on precursor ion mass detection to trigger MS/MS acquisition.