Science Inventory

20190825 - The EPA CompTox Chemicals Dashboard to support structure identification and chemical forensics using mass spectrometry (ACS Fall 2019)

Citation:

Williams, A., A. Chao, T. Transue, T. Cathey, E. Ulrich, AND J. Sobus. 20190825 - The EPA CompTox Chemicals Dashboard to support structure identification and chemical forensics using mass spectrometry (ACS Fall 2019). American Chemical Society Fall Meeting, San Diego, CA, August 25 - 29, 2019. https://doi.org/10.23645/epacomptox.9864206

Impact/Purpose:

Presentation to the American Chemical Society Fall Meeting August 2019. This presentation will provide an overview of the CompTox Chemicals Dashboard and demonstrate its utility for supporting structure identification and NTA in chemical forensics.

Description:

High resolution mass spectrometry (HRMS) and non-targeted analysis (NTA) are of increasing interest in chemical forensics for the identification of emerging contaminants and chemical signatures of interest. At the US Environmental Protection Agency, our research using HRMS for non-targeted and suspect screening analyses utilizes databases and cheminformatics approaches that are applicable to chemical forensics. The CompTox Chemicals Dashboard is an open chemistry resource and web-based application containing data for ~900,000 substances. Basic functionality for searching through the data is provided through identifier searches, such as systematic name, trade names and CAS Registry Numbers. Advanced Search capabilities supporting mass spectrometry include mass and formula-based searches, combined substructure-mass searches and searching experimental mass spectral data against predicted fragmentation spectra. A specific type of data mapping in the underpinning database, using “MS-Ready” structures, has proven to be a valuable approach for structure identification that links structures that can be identified via HRMS with related substances in the form of salts, and other multi-component mixtures that are available in commerce. These MS-Ready structures have been used as an input set for computational MS-fragmentation to provide a database against which to search experimental data for spectral matching. This presentation will provide an overview of how the CompTox Chemicals Dashboard supports structure identification and non-targeted analysis in chemical forensics. This abstract does not necessarily represent the views or policies of the U.S. Environmental Protection Agency.

Record Details:

Record Type: DOCUMENT ( PRESENTATION/ SLIDE)
Product Published Date: 08/29/2019
Record Last Revised: 09/19/2019
OMB Category: Other
Record ID: 346696