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Related Concept Videos

Mass Spectrometers01:16

Mass Spectrometers

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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:
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Mass Spectrum: Interpretation01:24

Mass Spectrum: Interpretation

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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 low-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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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 electrospray 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...
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Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
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Peptide Identification Using Tandem Mass Spectrometry01:33

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Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
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Mass Spectrometry: Carboxylic Acid, Ester, and Amide Fragmentation01:01

Mass Spectrometry: Carboxylic Acid, Ester, and Amide Fragmentation

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The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene.
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Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow
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FederEI: Federated Library Matching Framework for Electron Ionization Mass Spectrum Based Compound Identification.

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FederEI offers a federated library matching solution for electron ionization mass spectrometry (EI-MS) compound identification. This approach enhances data privacy and reduces fragmentation by enabling decentralized spectral matching.

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Area of Science:

  • Analytical Chemistry
  • Computational Chemistry
  • Data Science

Background:

  • Mass spectrometry (MS) is vital for compound structure elucidation across pharmaceuticals, environmental analysis, and metabolomics.
  • Compound identification relies on spectral matching against reference libraries, but current universal libraries are often incomplete.
  • Fragmented, lab-specific spectral libraries hinder comprehensive compound identification.

Purpose of the Study:

  • To introduce FederEI, a federated library matching solution for electron ionization mass spectrometry (EI-MS).
  • To enable decentralized compound identification while ensuring data privacy and preserving data control within individual laboratories.
  • To address the limitations of fragmented spectral libraries and improve the comprehensiveness of compound identification.

Main Methods:

  • Development of a federated library matching framework using a server-to-server connection.
  • Implementation of a decentralized approach where laboratories retain control over their spectral data.
  • Integration of a fast and accurate library matching algorithm within the federated system.

Main Results:

  • FederEI enables secure, decentralized compound identification without extensive data transmission.
  • The federated matching algorithm demonstrates performance comparable to traditional local matching.
  • FederEI effectively maintains data privacy and security throughout the identification process.

Conclusions:

  • FederEI provides a robust solution for EI-MS-based compound identification by overcoming the limitations of fragmented libraries.
  • The federated approach enhances data privacy and security, crucial for collaborative scientific endeavors.
  • FederEI facilitates more comprehensive and reliable compound identification in diverse analytical domains.