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James Little/Mass Spec Interpretation Services
My main interest is the identification of organic compounds by mass spectrometry in organic mixtures.
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Changes in Tandem (MS/MS) NIST23 Search Program (V3.0)

Fr, 26.5.2023
| Original article from: Mass Spec Interpretation Services/James Little
NIST2023 Library and Software Available in Early June. Many very significant improvements in the new version compared to 2020 version..
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  • Photo: James Little: Changes in Tandem (MS/MS) NIST23 Search Program (V3.0)
  • Video: James Little: V3 NIST Search Software for the Identification of Unknowns Using Tandem (MSMS) Spectra

Tandem MS/MS library

James Little: Postup rozšíření NIST Tandem Mass Spectral Library

FREE Video educational series: LC/MS Unknown Identifications Using MSMS Libraries

EI library

FREE Video educational series: Identification of unknowns in GC/MS

Changes in Tandem (MS/MS) NIST23 Search Program (V3.0)

  • List of Changes in NIST23 Search from User Manual
  • Large Increase in Tandem Spectra NIST23
  • New Compound Selection Process
  • Procedure of Extending the NIST Tandem Mass Spectral Library
  • Simplified Menus Separating Tandem and EI Search Options

Simplified EI Library Search Options Menu: Only Tandem (MS/MS) Options!

  • Only the Tandem search options shown in Identity and Similarity searches for V3.0
  • Pull down menu for searches, New Partial Spectrum Search

New InChIKey Google Link to Internet in V3.0 Replaces PubChem Link in V2.4

  • Much improved link to Google search when clicking on InChIKey
  • Often useful to select image tab in Google results to see only images
  • PubChem should still shown in the search results, but only indirectly

Databases Reference in Search Results Significantly Extended

  • Many more databases referenced
  • Results display shows abbreviations and the total number of references
  • Search results show full name of the database
  • List of databases in NIST PDF document shown on next slide
  • If similar hit results for compounds with different structures, should consider the one with highest number of database references in absence of sample history

Very Much Improved Name Search in V3.0 NIST Search

  • Number of characters searched increased from 16-249
  • Greatly improves results for specific compound of interest
  • When typing in request, spaces, commas, etc. are ignored
  • Can toggle to ignore numbers if desired with a-z button, but should include when specific isomer desired
  • Results at bottom of screen show tandem spectra obtained at different conditions
  • Only one library searched at a time

In Summary

  • Use Part O to understand changes from V3.0 to 2.4
  • Then view Parts I-VIII to gain complete understanding of the software for unknown identification
  • In general, all major functions and concepts are the same
  • NIST just simplified the Library Search options menu
  • Created an EI specific one and a Tandem (MS/MS) specific one
  • Many other nice features added including improved name search, Google/InChIKey search, etc.
  • See total list in manual pg 23 for other minor changes
James Little/Mass Spec Interpretation Services
 

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