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Related Concept Videos

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...
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...
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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 Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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...

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Liquid Chromatography Coupled to Refractive Index or Mass Spectrometric Detection for Metabolite Profiling in Lysate-based Cell-free Systems
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LC-MS spectra processing.

Rune Matthiesen1

  • 1Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Porto, Portugal.

Methods in Molecular Biology (Clifton, N.J.)
|May 14, 2013
PubMed
Summary
This summary is machine-generated.

Accurate mass spectrometry data analysis relies on precise peak extraction from raw data. This study reviews current methods, highlights unresolved issues in mass-to-charge (m/z) value processing, and proposes novel concepts for improved analysis and visualization.

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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Data Science

Background:

  • Peak extraction is a critical initial step in Liquid Chromatography-Mass Spectrometry (LC-MS) data analysis.
  • The accuracy of subsequent analyses, including database searches and peak quantitation, is directly influenced by the quality of peak extraction.
  • Mass spectrometers primarily provide accurate m/z (mass-to-charge) values, necessitating sophisticated algorithms for their extraction and rigorous scrutiny.

Purpose of the Study:

  • To discuss current peak processing methods in LC-MS data analysis.
  • To address unresolved or neglected issues in the field of peak extraction.
  • To propose novel concepts for the analysis and visualization of mass spectrometry data.

Main Methods:

  • Review of existing peak extraction algorithms for LC-MS data.
  • Discussion of challenges and limitations in current m/z value processing.
  • Introduction of new conceptual approaches for data analysis and visualization.

Main Results:

  • Identification of key areas requiring improvement in peak extraction techniques.
  • Highlighting the importance of scrutinizing extracted m/z values.
  • Presentation of novel ideas for enhanced data interpretation.

Conclusions:

  • Effective peak processing is fundamental for reliable LC-MS data analysis.
  • Further research is needed to address existing challenges in peak extraction and m/z value processing.
  • Novel analytical and visualization strategies can improve the interpretation of mass spectrometry data.