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Related Concept Videos

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

Matrix-Assisted Laser Desorption Ionization (MALDI)

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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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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Electrospray Ionization (ESI) Mass Spectrometry01:12

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ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...

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Matrix-assisted laser desorption/ionization mass spectrometry using a visible laser.

Lee Chuin Chen1, Daiki Asakawa, Hirokazu Hori

  • 1Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu 400-8511, Japan.

Rapid Communications in Mass Spectrometry : RCM
|November 21, 2007
PubMed
Summary

Visible matrix-assisted laser desorption/ionization (VIS-MALDI) using 2-amino-3-nitrophenol offers a complementary mass spectrometry technique. This method provides deeper laser penetration for specific applications, yielding comparable results to UV-MALDI.

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Published on: November 26, 2013

Area of Science:

  • Analytical Chemistry
  • Spectroscopy

Background:

  • Matrix-assisted laser desorption/ionization (MALDI) is a key mass spectrometry technique.
  • Conventional MALDI typically utilizes ultraviolet (UV) laser excitation.

Purpose of the Study:

  • To investigate the efficacy of visible matrix-assisted laser desorption/ionization (VIS-MALDI) using 2-amino-3-nitrophenol.
  • To compare VIS-MALDI with conventional UV-MALDI for analyzing peptides, polymers, and small proteins.

Main Methods:

  • Visible matrix-assisted laser desorption/ionization (VIS-MALDI) was performed using 2-amino-3-nitrophenol as the matrix.
  • A 532 nm wavelength (frequency-doubled Nd:YAG laser) was used for matrix excitation.
  • Comparisons were made with UV-MALDI using a 355 nm laser (frequency-tripled Nd:YAG laser).

Main Results:

  • VIS-MALDI and UV-MALDI produced similar mass spectra for peptides, polymers, and small proteins with comparable sensitivities.
  • The matrix, 2-amino-3-nitrophenol, exhibits near-neutral pH and absorption in the near-UV and visible regions.
  • VIS-MALDI demonstrated a larger optical penetration depth but higher sample consumption per laser shot compared to UV-MALDI due to lower absorption at 532 nm.

Conclusions:

  • VIS-MALDI using 2-amino-3-nitrophenol is a viable complementary technique to UV-MALDI.
  • This method is particularly useful in applications requiring deeper laser penetration.
  • The choice between VIS-MALDI and UV-MALDI depends on specific analytical needs and sample characteristics.