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Related Concept Videos

Peptide Identification Using Tandem Mass Spectrometry01:33

Peptide Identification Using Tandem Mass Spectrometry

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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.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
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Tandem Mass Spectrometry01:21

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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 Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Mass Spectrometry: Complex Analysis01:21

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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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An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
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Mass Spectrometers01:16

Mass Spectrometers

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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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Updated: Jan 15, 2026

Detection of Protein Ubiquitination Sites by Peptide Enrichment and Mass Spectrometry
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A Universal Spectrum Annotator for Complex Peptidoforms in Mass Spectrometry-Based Proteomics.

Douwe Schulte1, Rien W Leuvenink1, Shelley Jager1

  • 1Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute of Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584CH Utrecht, The Netherlands.

Analytical Chemistry
|October 14, 2025
PubMed
Summary

Annotator is a new graphical tool for unified peptide spectrum annotation across diverse mass spectrometry proteomics applications. It supports various fragmentation methods and modifications, improving data interpretation.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Bioinformatics

Background:

  • Peptide spectrum annotation is vital for mass spectrometry proteomics data interpretation.
  • Existing tools are often specialized, limiting comprehensive analysis.
  • A unified approach is needed for diverse peptide fragmentation spectra.

Purpose of the Study:

  • To develop a comprehensive, interactive graphical tool for unified peptide spectrum annotation.
  • To provide a versatile codebase for various proteomics applications.
  • To enhance the interpretation of complex mass spectrometry data.

Main Methods:

  • Development of an interactive graphical tool named Annotator.
  • Implementation of an underlying codebase in Rust (rustyms).
  • Integration of ProForma 2.0 notation for theoretical fragmentation and matching.
  • Support for multiple fragmentation methods and ion types (a/b/c, x/y/z, etc.).
  • Inclusion of common and custom post-translational modifications.

Main Results:

  • Annotator enables unified spectrum annotation for bottom-up, middle-down, top-down, cross-linked, and glycopeptide spectra.
  • The tool supports all major ion types and fragmentation methods.
  • It integrates extensive post-translational modification databases and customizability.
  • The Rust library with Python bindings facilitates broad application.

Conclusions:

  • Annotator offers a comprehensive solution for peptide spectrum annotation in mass spectrometry.
  • The tool enhances the interpretation of diverse and complex peptidoforms.
  • It represents a significant advancement for proteomics data analysis.