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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...
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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...
Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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...
Mass Spectrometers01:16

Mass Spectrometers

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:
Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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 electron 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 behind a...
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...

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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer
09:38

Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer

Published on: November 26, 2013

Matrix-free methods for laser desorption/ionization mass spectrometry.

Dominic S Peterson1

  • 1Los Alamos National Laboratory, Chemistry Division, Mailstop K484, Los Alamos, New Mexico 87545, USA. DominicP@lanl.gov

Mass Spectrometry Reviews
|September 13, 2006
PubMed
Summary

Matrix-free laser desorption/ionization mass spectrometry (LDI-MS) offers a solution for analyzing small molecules, overcoming limitations of traditional matrix-assisted laser desorption/ionization (MALDI). This review explores innovative matrix-free techniques for enhanced small molecule analysis.

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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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Dithranol as a Matrix for Matrix Assisted Laser Desorption/Ionization Imaging on a Fourier Transform Ion Cyclotron Resonance Mass Spectrometer

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Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization (IR-MALDESI)
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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Spectroscopy

Background:

  • Matrix-assisted laser desorption/ionization (MALDI) is a powerful soft ionization technique for analyzing polymers and proteins.
  • A key limitation of MALDI is its difficulty in analyzing low molecular weight compounds (<1,000 m/z) due to matrix interference.
  • There is a growing need for effective methods to analyze small molecules using laser desorption/ionization mass spectrometry.

Purpose of the Study:

  • To review and examine matrix-free laser desorption/ionization (LDI) mass spectrometry approaches for small molecule analysis.
  • To define matrix-free LDI methods as those not requiring analyte-matrix co-crystallization.
  • To explore ionization mechanisms and applications of these advanced LDI techniques.

Main Methods:

  • Review of literature on matrix-free laser desorption/ionization (LDI) mass spectrometry.
  • Focus on techniques such as desorption/ionization on silicon (DIOS), sol-gels, and carbon-based microstructures.
  • Analysis of ionization mechanisms and practical applications in small molecule detection.

Main Results:

  • Matrix-free LDI techniques provide viable alternatives for analyzing low molecular weight compounds.
  • Methods like DIOS, sol-gels, and carbon microstructures avoid matrix-related interferences.
  • These approaches enable sensitive and selective analysis of small molecules.

Conclusions:

  • Matrix-free LDI mass spectrometry is a promising field for overcoming MALDI's limitations in small molecule analysis.
  • Continued development of these techniques will expand their applicability in various scientific domains.
  • The reviewed methods offer significant advantages for the sensitive detection of small molecules.