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Related Concept Videos

Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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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 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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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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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) 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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Imaging of Biological Tissues by Desorption Electrospray Ionization Mass Spectrometry
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Development of Low-Flow High-Resolution Desorption Electrospray Ionization Mass Spectrometry Imaging.

Mark W Towers1, Rachel J DeHoog2, Trevor M Godfrey2

  • 1Waters Corporation, Wilmslow SK9 4AX, U.K.

Journal of the American Society for Mass Spectrometry
|December 4, 2025
PubMed
Summary

Researchers developed a low-flow desorption electrospray ionization mass spectrometry (DESI-MS) method for high-resolution tissue imaging. This technique achieves sub-10 μm spatial resolution, enabling detailed molecular analysis of biological samples and cancer cell identification.

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Area of Science:

  • Analytical Chemistry
  • Biomedical Imaging
  • Mass Spectrometry

Background:

  • Desorption electrospray ionization mass spectrometry (DESI-MS) is a key technique for molecular analysis of biological tissues.
  • Current DESI-MS methods face limitations in spatial resolution compared to other mass spectrometry imaging techniques.

Purpose of the Study:

  • To develop and optimize a low-flow DESI-MS method for achieving sub-10 μm spatial resolution in tissue imaging.
  • To demonstrate the applicability of this high-resolution technique for detailed molecular analysis and cancer detection.

Main Methods:

  • Modified a commercial DESI sprayer by reducing solvent flow rates (<350 nL/min) and optimizing back-pressure and geometry.
  • Applied low-flow DESI-MS to image porcine liver and rat brain tissue sections at 5-10 μm resolution.
  • Utilized the nondestructive nature of DESI-MS for sequential lower and higher resolution imaging of the same tissue section.

Main Results:

  • Achieved spatial resolution of 5-10 μm, revealing high spatial fidelity and detailed histologic features in tissue images.
  • Demonstrated successful imaging and classification of human thyroid cancer tissue sections and fine-needle aspiration (FNA) biopsies at 10 μm resolution.
  • Accurately identified cancer cells within FNA samples using the developed low-flow DESI-MS method.

Conclusions:

  • The developed low-flow DESI-MS method significantly enhances spatial resolution for tissue imaging.
  • This technique offers robustness and applicability for various biomedical and clinical studies, including cancer diagnostics.
  • Low-flow DESI-MS holds potential for advancing molecular imaging in diverse research areas.