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Related Concept Videos

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

1.6K
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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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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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Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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Mass spectrometry is an analytical technique used to determine the molecular mass and molecular formula of a compound. The basic principle of mass spectrometry is to generate ions from the analyte molecule and measure these ion abundances against their molecular mass. One common type of ionization, known as electron ionization or EI, bombards the analyte molecules in the gas phase with high-energy electron beams. The electron beams displace an electron from the molecule and leave behind a...
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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

6.5K
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...
6.5K
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

2.7K
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...
2.7K
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

2.3K
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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Analyzing Large Protein Complexes by Structural Mass Spectrometry
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SLIMPHONY: A SLIM-Based Instrument That Orchestrates Complex Ion Mobility-Mass Spectrometry Experiments.

AnneClaire Wageman1, Addison E Roush1, Yuan Feng1

  • 1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195-1700, United States.

Journal of the American Society for Mass Spectrometry
|September 26, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed SLIMPHONY, a novel instrument combining multiple dimensions of ion mobility (IM) and mass spectrometry (MS). This advanced platform enhances the analysis of complex biological molecules like proteins by providing greater detail on their structure and dynamics.

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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry
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Analyzing Protein Architectures and Protein-Ligand Complexes by Integrative Structural Mass Spectrometry

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Physical Chemistry

Background:

  • Biological macromolecules exhibit inherent heterogeneity, posing challenges for detailed structural and dynamic analysis.
  • Ion mobility coupled with mass spectrometry (IM-MS) offers insights into the size, shape, and dynamics of proteins and their complexes.
  • Multidimensional IM-MS (IM-IM-MS) has the potential to significantly increase analytical information content for complex samples.

Purpose of the Study:

  • To introduce SLIMPHONY, a new instrument based on the Structures for Lossless Ion Manipulations (SLIM) architecture.
  • To demonstrate the capabilities of SLIMPHONY for complex multidimensional separations and ion manipulation.
  • To showcase SLIMPHONY's flexibility in characterizing protein ions through tunable activation and variable-length ion mobility separations.

Main Methods:

  • Development of SLIMPHONY, featuring eight independently controlled traveling-wave regions for multidimensional separations.
  • Single-dimension IM-MS experiments to assess separation resolution and its dependence on separation length.
  • Ion selection, trapping, and tunable activation of ion subpopulations between IM dimensions.

Main Results:

  • Demonstrated increased peak-to-peak resolution in IM-MS with extended separation lengths for specific ions.
  • Probed gas-phase unfolding of ubiquitin ion subpopulations using ion selection and trapping.
  • Showcased tunable activation of ubiquitin subpopulations, analyzed via variable-length IM separations.

Conclusions:

  • SLIMPHONY provides a flexible platform for advanced characterization of protein ions.
  • The instrument enables precise control over ion manipulation, separation dimensions, and activation.
  • This technology holds promise for deeper insights into the heterogeneity and dynamics of biological macromolecules.