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Mass Spectrometry: Overview01:19

Mass Spectrometry: Overview

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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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Tandem Mass Spectrometry01:21

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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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Mass Spectrometry of Amines01:15

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In mass spectroscopy, amines undergo fragmentation to give parent ions with odd molecule weights. This observed mass spectrum follows the nitrogen rule; a molecule with an odd number of nitrogen atoms produces a molecular ion with an odd molecular weight. Amines undergo fragmentation through α cleavage, producing nitrogen-containing cations—iminium ions—and alkyl radicals. Mass spectra of aromatic and cyclic aliphatic amines exhibit strong molecular ion peaks, but acyclic...
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Mass Spectrometry: Isotope Effect01:13

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Mass Spectrometry: Alkene Fragmentation00:59

Mass Spectrometry: Alkene Fragmentation

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Alkenes lose one electron from the unsaturated π bond upon ionization and form stable molecular ions. Further fragmentation of alkenes occurs through three different reaction pathways. The most prominent fragmentation is the cleavage at the allylic position. The resultant allylic carbocation is resonance stabilized. In the mass spectra of terminal alkenes, this fragment appears at a mass-to-charge ratio of 41. In the internal alkenes, where there are two choices of allylic cleavage, the...
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A Space Efficient Direct Access Data Compression Approach for Mass Spectrometry Imaging.

Patrik Källback1, Anna Nilsson1, Mohammadreza Shariatgorji1

  • 1Biomolecular Mass Spectrometry Imaging, National Resource for Mass Spectrometry Imaging, Science for Life Laboratory, Department of Pharmaceutical Biosciences , Uppsala University , Box 591 BMC, 75124 Uppsala , Sweden.

Analytical Chemistry
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PubMed
Summary
This summary is machine-generated.

Large mass spectrometry imaging data files are now manageable with a new near-lossless compression method. This technique significantly reduces file size, enabling efficient data handling and storage for demanding applications.

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Area of Science:

  • Analytical Chemistry
  • Biotechnology
  • Computational Science

Background:

  • Mass spectrometry imaging (MSI) generates large datasets due to high spatial and mass resolution.
  • Current software struggles to efficiently handle these massive MSI data files.
  • This limitation hinders the widespread adoption and analysis of complex MSI data.

Purpose of the Study:

  • To develop a novel, near-lossless compression method for mass spectrometry imaging data.
  • To significantly reduce data file sizes while preserving data integrity.
  • To enable efficient direct access and evaluation of compressed MSI data.

Main Methods:

  • Developed a novel near-lossless compression algorithm with data entropy reduction.
  • Implemented four adjustable compression levels: coarse, medium, fine, and superfine.
  • Applied compression to spectra or spectrum-by-spectrum, and transpose arrays or array-by-array for direct access.

Main Results:

  • Achieved compression ratios up to 5.9:1 for commercial software data and 55:1 for msIQuant data.
  • Demonstrated minimal deviation (max 0.2%) between compressed and uncompressed data at coarse accuracy.
  • Showed only a slight increase in image update time (114 ms vs. 92 ms) when accessing compressed data.

Conclusions:

  • The developed compression method offers significant file size reduction for MSI data.
  • Direct access to compressed data is feasible without full decompression, improving workflow efficiency.
  • This algorithm facilitates storage and evaluation of large MSI datasets on accessible servers.