Nonuniform Sampling Acquisition of Two-Dimensional Fourier Transform Ion Cyclotron Resonance Mass Spectrometry for Increased Mass Resolution of Tandem Mass Spectrometry Precursor Ions.

Obtaining the full MS/MS map for fragments and precursors of complex mixtures without hyphenation with chromatographic separation by a data-independent acquisition is a challenge in mass spectrometry which is solved by two-dimensional (2D) Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS). Until now 2D FTICR MS afforded only a moderate resolution for precursor ion since this resolution is limited by the number of evolution interval steps to which the number of scans, the acquisition time, and the sample consumption are proportional. An overnight acquisition is already required to reach a quadrupole mass filter-like unit mass resolution. Here, we report that 2D FTICR MS using nonuniform sampling (NUS) obtained by randomly skipping points in the first dimension corresponding to the precursor selection gives access, after data processing, to the same structural information contained in a complex mixture. The resolution increases roughly as the inverse of the NUS ratio, up to 26 times at NUS 1/32, leading to an acquisition time reduced in the same ratio compared to a classical acquisition at the same resolution. As an example, the analysis of a natural oil is presented.

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