Systems and methods for identifying precursor ions from product ions using arbitrary transmission windowing

摘要

Ions are separated from a sample over time and filtered. The precursor ions produced at each step are fragmented. Resulting product ions are analyzed using a mass analyzer, producing a product ion spectrum for each step of the transmission window and a plurality of product ion spectra for the mass range for the each scan. The plurality of product ion spectra are received, producing a plurality of multi-scan product ion spectra. At least one product ion is selected from the plurality of multi-scan product ion spectra that is present at least two or more times in product ion spectra from each of two or more scans. A known separation profile of a precursor ion is fit to intensities from the at least one product ion in the plurality of multi-scan product ion spectra to reconstruct a separation profile of a precursor ion of the at least one product ion.

主权项

1. A system for reconstructing a separation profile of a precursor ion in a tandem mass spectrometry experiment from multiple scans across a mass range, comprising:
a separation device that separates ions from a sample; a mass filter that receives the ions from the separation device and filters the ions by, in each of two or more scans across a mass range, stepping a transmission window that has a constant rate of precursor ion transmission for each precursor ion across the mass range, producing a series of overlapping transmission windows across the mass range for each scan of the two or more scans; a fragmentation device that fragments the precursor ions produced at each step; a mass analyzer that analyzes resulting product ions, producing a product ion spectrum for each step of the transmission window and a plurality of product ion spectra for the mass range for the each scan; and a processor in communication with the mass filter and the mass analyzer that
receives the plurality of product ion spectra produced by the series of overlapping transmission windows for the each scan, producing a plurality of multi-scan product ion spectra,selects at least one product ion from the plurality of multi-scan product ion spectra that is present at least two or more times in product ion spectra from each of two or more scans, andfits a known separation profile of a precursor ion to intensities from the at least one product ion in the plurality of multi-scan product ion spectra to reconstruct a separation profile of a precursor ion of the at least one product ion.