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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.
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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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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 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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Matrix-Assisted Laser Desorption Ionization (MALDI)01:08

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Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
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Related Experiment Video

Updated: Jan 15, 2026

Simultaneous Affinity Enrichment of Two Post-Translational Modifications for Quantification and Site Localization
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High Dynamic Range Peptide Mass Spectrometry Using Segmented Precursor Ion Accumulation.

Maria C Panepinto1, Francesca Minicozzi1, Paolo Cifani1

  • 1Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, United States.

Analytical Chemistry
|October 15, 2025
PubMed
Summary
This summary is machine-generated.

High dynamic range MS1 (HDR-MS1) enhances mass spectrometry sensitivity by improving detection of low-intensity ions. This proteomic strategy increases peptide and protein identifications in data-dependent acquisition experiments.

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Area of Science:

  • Proteomics
  • Mass Spectrometry
  • Analytical Chemistry

Background:

  • Data-dependent acquisition (DDA) mass spectrometry faces limitations in sensitivity and proteome sampling depth.
  • This is often due to insufficient fragmentation spectra acquisition rates and limited MS1 scan sensitivity and dynamic range, hindering the detection of low-intensity ions.

Purpose of the Study:

  • To address the limitations of conventional MS1 scans in DDA mass spectrometry.
  • To improve the detection of low-intensity ions and enhance proteome sampling by increasing dynamic range and sensitivity.

Main Methods:

  • Introduced a strategy named high dynamic range MS1 (HDR-MS1).
  • HDR-MS1 employs gas-phase segmentation of the MS1 scan range using quadrupolar isolation windows designed to transmit equal charges.
  • This segmentation allows for coaccumulation and detection of all ions, reducing the impact of abundant ions on ion capacity.

Main Results:

  • HDR-MS1 demonstrated improved dynamic range and sensitivity compared to conventional full-range MS1 scans.
  • Achieved a higher number of peptide and protein identifications under identical MS2 parameters.
  • Resulted in less redundant precursor ion sampling and a higher rate of quantified precursor ions.

Conclusions:

  • HDR-MS1 is an easily implementable strategy to enhance DDA mass spectrometry.
  • The method significantly improves proteome coverage by enhancing MS1 scan performance.
  • HDR-MS1 is compatible with existing DDA workflows and analysis software.