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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Updated: Jan 18, 2026

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Improving proteomic dynamic range with Multiple Accumulation Precursor Mass Spectrometry (MAP-MS).

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    This summary is machine-generated.

    We developed Multiple Accumulation Precursor Mass Spectrometry (MAP-MS) to enhance Orbitrap mass spectrometry. This method nearly doubles the dynamic range for precursor quantification without hardware or software changes.

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    Area of Science:

    • Analytical Chemistry
    • Mass Spectrometry
    • Proteomics

    Background:

    • Orbitrap (OT) mass spectrometers offer high-resolution analysis but suffer from slower scanning speeds compared to other mass analyzers.
    • Existing methods for dynamic range extension in OT-MS are limited.

    Purpose of the Study:

    • To improve the precursor dynamic range of Orbitrap mass spectrometers.
    • To introduce a novel method for enhancing precursor ion quantification without hardware or software modifications.

    Main Methods:

    • Utilized long Orbitrap transients to extend precursor dynamic range.
    • Developed Multiple Accumulation Precursor Mass Spectrometry (MAP-MS) by multiplexing several precursor m/z ranges into a single scan.
    • Collected data using both data-dependent acquisition (DDA) and data-independent acquisition (DIA) methods.

    Main Results:

    • MAP-MS achieved nearly 2x dynamic range extension with no adverse effects.
    • Precursor quantification improved with higher quality measurements in DDA.
    • DIA detection sensitivity was enhanced by up to 11% when combining precursor and tandem mass spectra.

    Conclusions:

    • MAP-MS is an effective strategy for enhancing precursor dynamic range in Orbitrap mass spectrometry.
    • The method offers significant benefits for both DDA and DIA workflows, particularly in peptide detection and quantification.