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Related Concept Videos

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

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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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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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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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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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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 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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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
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Rapid high mass resolution mass spectrometry using matrix-assisted ionization.

Sarah Trimpin1, Shameemah Thawoos2, Casey D Foley2

  • 1Department of Chemistry, Wayne State University, Detroit, MI 48202, USA; Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI 48202, USA.

Methods (San Diego, Calif.)
|February 3, 2016
PubMed
Summary

Matrix-assisted ionization (MAI) offers a robust and sensitive method for analyzing proteins in complex samples, simplifying workflows. This technique combines the advantages of electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI) for high-resolution biomolecule analysis.

Keywords:
High resolutionIonizationLasersprayMass spectrometryMatrix-assistedProtein

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Mass Spectrometry

Background:

  • Traditional mass spectrometry methods often require extensive sample preparation.
  • Complex biological samples with salts and buffers pose challenges for direct analysis.
  • Existing techniques like ESI and MALDI have limitations in specific applications.

Purpose of the Study:

  • To introduce and validate Matrix-Assisted Ionization (MAI) as a novel analytical method.
  • To demonstrate MAI's capability for analyzing proteins in complex matrices without prior cleanup.
  • To compare MAI performance with established ionization techniques.

Main Methods:

  • Development and application of Matrix-Assisted Ionization (MAI).
  • Analysis of proteins (cholera toxin B-subunit, pertussis toxin mutant) in solutions with high salt, buffer, and preservative content.
  • High-resolution mass spectrometry using an Orbitrap Fusion instrument.
  • Comparative analysis against Electrospray Ionization (ESI), Matrix-Assisted Laser Desorption/Ionization (MALDI), and Laserspray Ionization (LSI).

Main Results:

  • MAI successfully analyzed proteins in complex media without sample preparation or concentration.
  • The method demonstrated robustness and high sensitivity.
  • MAI provided multiply charged ions (like ESI) and robustness (like MALDI).
  • Ultra-high resolution analysis on Orbitrap Fusion resolved protein subunits, surpassing MALDI-time-of-flight capabilities.

Conclusions:

  • MAI is a versatile and efficient analytical technique for biomolecules in challenging matrices.
  • MAI simplifies and accelerates analytical workflows by reducing sample preparation steps.
  • MAI offers a unique combination of ESI and MALDI benefits for high-resolution mass spectrometry.