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Peptide Identification Using Tandem Mass Spectrometry01:33

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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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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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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A Novel Ultrahigh-Resolution Y-Injection Multireflecting Time-of-Flight Mass Spectrometer for Bottom-Up Proteomics.

Aleksey V Vorobyev1, Vasily V Makarov1, Stanislav P Kozlov1

  • 1Mass Spectrometry Consulting Ltd, MSC-CG, Bar 85000, Montenegro.

Analytical Chemistry
|November 4, 2025
PubMed
Summary
This summary is machine-generated.

A novel ultrahigh-resolution mass spectrometer (Y-MRT MS) enables comprehensive whole-proteome analysis. This technology identifies thousands of protein groups with high mass accuracy, advancing bottom-up proteomics research.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Biotechnology

Background:

  • Bottom-up proteomics aims to identify and quantify proteins in complex biological samples.
  • Existing mass spectrometry techniques face limitations in resolution, speed, and dynamic range for comprehensive proteome analysis.

Purpose of the Study:

  • To present the initial performance evaluation of a new planar multipass time-of-flight mass spectrometer with periodic reflecting lenses (Y-MRT MS).
  • To assess the Y-MRT MS instrument's capability for ultrahigh-resolution, bottom-up whole-proteome analysis.

Main Methods:

  • Utilized a Y-MRT MS instrument for whole-proteome analysis of human cell lines (MCF-7 and HeLa).
  • Employed DirectMS1 method for MS/MS-free proteome analysis and SWATH-DIA mode for data-independent acquisition.
  • Performed single-shot 30-minute gradient High-Performance Liquid Chromatography (HPLC) separations.

Main Results:

  • Achieved resolving power of 600,000–800,000 for peptide ions across the m/z range.
  • Identified over 4000 protein groups in single-shot analyses (DirectMS1) and up to 4500 with combined runs.
  • Demonstrated peptide ion mass accuracy of 70–130 ppb and a dynamic range exceeding 104.
  • Obtained 4350 protein IDs in SWATH-DIA mode within 30-minute gradients.

Conclusions:

  • The Y-MRT MS instrument demonstrates significant potential for high-performance bottom-up proteomics.
  • The achieved resolution and sensitivity facilitate deeper proteome coverage.
  • Future optimization with HPLC and ion mobility separation may further enhance proteome coverage and reduce analysis time.