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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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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 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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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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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...
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Electrospray Ionization (ESI) Mass Spectrometry01:12

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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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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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Updated: Apr 28, 2026

Whole-body Mass Spectrometry Imaging by Infrared Matrix-assisted Laser Desorption Electrospray Ionization IR-MALDESI
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Surface-assisted laser desorption ionization mass spectrometry techniques for application in forensics.

Taryn Guinan1, Paul Kirkbride2, Paul E Pigou2

  • 1Mawson Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.

Mass Spectrometry Reviews
|June 12, 2014
PubMed
Summary

Surface-assisted laser desorption ionization mass spectrometry (SALDI-MS) overcomes limitations of traditional MALDI-MS for detecting small molecules. This review highlights SALDI advancements and forensic applications, including drug and trace evidence analysis.

Keywords:
forensic analysisillicit drugslaser desorption ionization mass spectrometrynanostructured surfaces

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Forensic Science

Background:

  • Matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS) excels at analyzing large molecules (>700 Da).
  • Detecting smaller organic molecules (<700 Da) with MALDI-MS is difficult due to matrix interference.
  • Nanostructured substrates enable matrix-free laser desorption ionization (LDI), leading to surface-assisted laser desorption ionization (SALDI) mass spectrometry (MS).

Purpose of the Study:

  • To review recent advances in SALDI techniques.
  • To compare the strengths and weaknesses of various SALDI methods.
  • To focus on the forensic applications of SALDI-MS.

Main Methods:

  • Discussion of desorption ionization on porous silicon (DIOS).
  • Overview of nano-initiator mass spectrometry (NIMS).
  • Examination of nano assisted laser desorption ionization (NALDI™).

Main Results:

  • SALDI-MS enables sensitive detection of small organic molecules, overcoming MALDI-MS limitations.
  • SALDI techniques show significant potential for high-throughput drug testing (roadside, workplace, athlete).
  • Forensic applications include detecting illicit drugs, metabolites in biological samples, and trace evidence from banknotes and fingerprints.

Conclusions:

  • SALDI-MS is a rapidly growing technique, particularly valuable in forensics.
  • SALDI-MS facilitates sensitive detection of small molecules and trace evidence.
  • Recent advances in SALDI-MS, including mass spectrometry imaging (MSI), offer powerful analytical capabilities.