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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...
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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...
Mass Spectrum: Interpretation01:24

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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...
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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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MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...

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Surface Plasmon Resonance-Laser Desorption/Ionization-Time-of-Flight Mass Spectrometry.

S Owega1, E P Lai, A D Bawagan

  • 1Ottawa-Carleton Chemistry Institute, Department of Chemistry, Carleton University, Ottawa, Ontario K1S 5B6, Canada.

Analytical Chemistry
|June 8, 2011
PubMed
Summary
This summary is machine-generated.

Surface plasmon resonance (SPR) enhances laser desorption/ionization mass spectrometry (LDI-TOFMS) by lowering laser energy needs and boosting signal intensity for biomolecules like gramicidin S.

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Area of Science:

  • Analytical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Laser desorption/ionization (LDI) is a mass spectrometry technique.
  • Surface plasmon resonance (SPR) is an optical phenomenon sensitive to surface changes.
  • Combining LDI with SPR may enhance analytical capabilities.

Purpose of the Study:

  • To investigate the effect of SPR on LDI-TOFMS.
  • To determine if SPR enhances LDI efficiency and sensitivity.
  • To explore SPR-LDI for analyzing higher molecular weight analytes.

Main Methods:

  • Utilized time-of-flight mass spectrometry (TOFMS) coupled with LDI.
  • Investigated LDI on thin silver film substrates at SPR angles.
  • Analyzed silver cations and gramicidin S using SPR-LDI.

Main Results:

  • SPR conditions reduced minimum laser fluence for silver cation production.
  • SPR angle incidence maximized gramicidin S molecular cation intensity.
  • Successfully analyzed gramicidin S (1141 amu), a higher mass analyte than previously reported.

Conclusions:

  • SPR significantly enhances the LDI-TOFMS process.
  • SPR-LDI offers improved sensitivity and lower energy requirements.
  • This technique shows promise for analyzing larger biomolecules with TOFMS.