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Related Concept Videos

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

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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 electrospray 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...
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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 signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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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Mass Spectrum: Interpretation01:24

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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 low-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.
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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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Sample Preparation Strategies for Mass Spectrometry Imaging of 3D Cell Culture Models
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Quantitative mass spectrometry imaging (qMSI): A tutorial.

Russell R Kibbe1, David C Muddiman1

  • 1Department of Chemistry, FTMS Laboratory for Human Health Research, North Carolina State University, Raleigh, North Carolina, USA.

Journal of Mass Spectrometry : JMS
|March 15, 2024
PubMed
Summary
This summary is machine-generated.

Mass spectrometry imaging (MSI) allows simultaneous detection and spatial mapping of chemicals in tissues. This tutorial guides designing quantitative MSI (qMSI) experiments for disease and drug studies.

Keywords:
absolute quantificationmass spectrometry imagingqMSIrelative quantification

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Area of Science:

  • Analytical Chemistry
  • Biomedical Imaging
  • Molecular Pathology

Background:

  • Mass spectrometry imaging (MSI) is a powerful analytical technique for simultaneous detection of numerous chemical species within biological tissues, preserving spatial distribution.
  • Current MSI applications excel at identifying and localizing molecules, significantly impacting health and disease research.
  • The integration of quantitative mass spectrometry (qMS) with MSI is the next frontier for precise localization and quantification of disease markers or drug effects.

Purpose of the Study:

  • To provide a tutorial on designing quantitative mass spectrometry imaging (qMSI) experiments.
  • To highlight key considerations and methods for overcoming the complexities of qMSI.
  • To assist researchers new to the field of MSI in adopting quantitative approaches.

Main Methods:

  • Detailed discussion of critical factors in designing qMSI experiments.
  • Explanation of established and emerging methodologies for quantitative analysis in MSI.
  • Focus on practical aspects relevant to experimental setup and data interpretation.

Main Results:

  • Provides a framework for successful qMSI experimental design.
  • Identifies strategies to address challenges in quantitative molecular imaging.
  • Empowers researchers to implement qMSI for advanced biomedical studies.

Conclusions:

  • Quantitative mass spectrometry imaging (qMSI) represents a significant advancement in molecular imaging.
  • Successful qMSI design and execution are crucial for accurate disease and drug action analysis.
  • This tutorial serves as a foundational guide for researchers entering the field of qMSI.