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Related Concept Videos

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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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 Spectrometry: Complex Analysis01:21

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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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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 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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Mass Spectrum01:23

Mass Spectrum

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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Chemical Ionization (CI) Mass Spectrometry01:21

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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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jqcML: an open-source java API for mass spectrometry quality control data in the qcML format.

Wout Bittremieux1, Pieter Kelchtermans, Dirk Valkenborg

  • 1Department of Mathematics and Computer Science, University of Antwerp , Middelheimlaan 1, B-2020 Antwerp, Belgium.

Journal of Proteome Research
|June 7, 2014
PubMed
Summary
This summary is machine-generated.

jqcML is a new Java API that simplifies working with quality control metrics (qcML) in proteomics. It enables easier data management for mass spectrometry experiments, promoting standardized quality control in the field.

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Area of Science:

  • Proteomics
  • Analytical Chemistry
  • Bioinformatics

Background:

  • Systematic quality control is crucial for the advancement of proteomics as an analytical discipline.
  • The quality control Markup Language (qcML) was developed to standardize the storage and dissemination of quality-control metrics in mass-spectrometry-based proteomics.
  • Widespread adoption of qcML requires accessible tools for its implementation.

Purpose of the Study:

  • To introduce jqcML, a Java application programming interface (API) designed to facilitate the use of the qcML data format.
  • To provide a comprehensive object model for representing qcML data within a Java environment.
  • To enable seamless reading, writing, and manipulation of qcML data from diverse sources, including XML files and relational databases.

Main Methods:

  • Development of a Java API (jqcML) with a complete object model for qcML data.
  • Integration with the Java Architecture for XML Binding (JAXB) for handling XML-based qcML files.
  • Utilization of the Java Persistence API (JPA) for uniform interaction with relational databases (qcDB).

Main Results:

  • jqcML offers a standardized object model for representing qcML data.
  • The API allows for unified data handling from both XML files and relational databases.
  • jqcML supports efficient reading, writing, and processing of quality-control metrics.

Conclusions:

  • jqcML significantly simplifies the implementation of standardized quality control in proteomics research.
  • The open-source Java API promotes broader adoption of the qcML format for mass spectrometry data.
  • jqcML enhances data management and interoperability for proteomics quality-control metrics.