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Related Concept Videos

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

Matrix-Assisted Laser Desorption Ionization (MALDI)

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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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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.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview01:19

Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview

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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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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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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Related Experiment Video

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Spatial Profiling of Elements through Matrix-Assisted Laser Desorption Ionization Mass Spectrometry Imaging.

Sylwia A Stopka1, Clément Bodineau1,2, Gerard Baquer1

  • 1Department of Neurosurgery, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, United States.

Analytical Chemistry
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This summary is machine-generated.

Matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI MSI) now enables direct element imaging alongside biomolecules. This advance offers new possibilities for metallomics and disease research.

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Area of Science:

  • Analytical Chemistry
  • Biomedical Imaging
  • Mass Spectrometry

Background:

  • Matrix-assisted laser desorption ionization mass spectrometry imaging (MALDI MSI) is primarily used for biomolecular mapping.
  • Established elemental imaging techniques like LA-ICP-MS and SIMS cannot simultaneously map elements and biomolecules.
  • There is a need for methods that integrate atomic and biomolecular spatial information.

Purpose of the Study:

  • To demonstrate the feasibility of MALDI MSI for direct spatial element profiling.
  • To optimize MALDI MSI parameters for sensitive element detection.
  • To showcase the integration of elemental and biomolecular imaging.

Main Methods:

  • Optimized MALDI MSI parameters (laser power, ionization, mass resolving power) for element detection (Fe, Ca, Gd, Pt, Cl).
  • Utilized high-resolution FTICR-MS and timsTOF MSI for assessing performance.
  • Applied the method to murine developmental models, genetic disorders, and chemotherapy distribution studies.

Main Results:

  • Successfully detected endogenous and exogenous elements using MALDI MSI.
  • Demonstrated preservation of spatial integrity during element imaging.
  • Confirmed the reliability of isotopologue distributions through computational modeling and spectral analysis.

Conclusions:

  • MALDI MSI is a viable alternative for high-resolution element imaging.
  • This method complements LA-ICP-MS and SIMS by integrating atomic and biomolecular data.
  • Expands MALDI MSI capabilities for metallomics, pharmacokinetics, and disease biomarker research.