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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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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MALDI-TOF Mass Spectrometry01:19

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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.
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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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High-Resolution Mass Spectrometry (HRMS)01:15

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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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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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Updated: Jun 28, 2025

Imaging of Biological Tissues by Desorption Electrospray Ionization Mass Spectrometry
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High-Specificity Imaging Mass Spectrometry.

Madeline E Colley1,2, Allison B Esselman2,3, Claire F Scott2,4

  • 11Department of Biochemistry, Vanderbilt University, Nashville, Tennessee, USA;

Annual Review of Analytical Chemistry (Palo Alto, Calif.)
|April 10, 2024
PubMed
Summary
This summary is machine-generated.

Recent advancements in imaging mass spectrometry (IMS) enhance molecular and spatial specificity. This improves untargeted tissue mapping for biological discovery and biomedical research.

Keywords:
DESIMALDISIMSbiological mass spectrometryhigh specificityimaging mass spectrometrymolecular imagingtissue imaging

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Area of Science:

  • Biomedical Research
  • Molecular Imaging
  • Biotechnology

Background:

  • Imaging mass spectrometry (IMS) offers highly multiplexed, untargeted tissue mapping for in situ biological discovery.
  • Challenges remain in achieving molecular specificity (distinguishing molecules) and spatial specificity (linking data to tissue features).

Purpose of the Study:

  • To review recent advancements in high-specificity IMS.
  • To highlight how these advancements provide biological context to untargeted molecular imaging.
  • To discuss applications in integrated analyses and advanced biomedical research.

Main Methods:

  • Review of instrumental developments in IMS, including improved spatial resolution.
  • Integration of ion mobility technologies for enhanced molecular coverage and chemical identity discernment.
  • Focus on advancements improving molecular and spatial specificity.

Main Results:

  • Improved spatial resolution allows better association of molecular observations with distinct tissue features across scales.
  • High-performance mass analyzers and ion mobility enhance molecular coverage and chemical identification.
  • Recent developments provide critical biological context to untargeted molecular imaging.

Conclusions:

  • High-specificity IMS is crucial for overcoming current limitations in molecular and spatial resolution.
  • These advancements enable more integrated analyses and address complex biomedical research questions.
  • The review underscores the growing potential of IMS in diverse biological and medical applications.