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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Related Experiment Video

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Method for Recording Broadband High Resolution Emission Spectra of Laboratory Lightning Arcs
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A Complete Pipeline for Generating a High-Resolution LC-MS-Based Reference Mass Spectra Library.

Nir Shahaf1, Asaph Aharoni1, Ilana Rogachev2

  • 1Department of Plant and Environmental Sciences, Faculty of Biochemistry, Weizmann Institute of Science, Rehovot, Israel.

Methods in Molecular Biology (Clifton, N.J.)
|May 16, 2018
PubMed
Summary

Creating mass spectrometry (MS) reference libraries for liquid chromatography (LC)-MS data is crucial for metabolomics. This study details a high-throughput method for automated library generation using plant metabolite standards.

Keywords:
ChemoinformaticsLC-MSMass spectrometryMetabolitesMetabolomicsPlant metabolismReference libraries

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Area of Science:

  • Analytical Chemistry
  • Metabolomics
  • Biochemistry

Background:

  • Mass spectrometry (MS) reference libraries are essential for identifying unknown compounds in metabolomics.
  • Established protocols exist for gas chromatography-MS (GC-MS), but not for liquid chromatography-MS (LC-MS).
  • This gap hinders high-throughput LC-MS data analysis and annotation.

Purpose of the Study:

  • To develop and present a high-throughput method for automated MS reference library generation for LC-MS data.
  • To detail the experimental and computational methodologies for creating such a library.
  • To showcase the application of this method in generating the WEIZMASS plant metabolite library.

Main Methods:

  • High-throughput experimental generation of chemical standard pools.
  • Computational conversion of experimental data into a unique MS reference library format.
  • Application of the methodology to plant metabolite samples.

Main Results:

  • Successful implementation of a high-throughput workflow for LC-MS data collection.
  • Automated generation of a comprehensive MS reference library (WEIZMASS) for plant metabolites.
  • Detailed documentation of the experimental and computational procedures.

Conclusions:

  • The presented approach enables efficient and automated MS reference library creation for LC-MS.
  • This facilitates reliable annotation of unknown metabolites in LC-MS-based metabolomics studies.
  • The WEIZMASS library serves as a valuable resource for plant metabolomics research.