Abstract
The identification of unknown compounds isolated during Effect-Directed Analysis (EDA) is often a hurdle on the way to the successful outcome of these studies. Ever-improving separation, analytical, and biological techniques allow the isolation of more compounds and effects; however, not all of the compounds contributing to sample toxicity are easily identified. The advancement of database search strategies and publishing of online databases has improved tentative identification of many compounds in recent years, but many chemicals and their transformation products are still not captured within such databases. Structure generation, where the analytical information is used to identify substructures present and absent, provides an alternative strategy to database searching. Where multiple structures matching an unknown spectrum are possible, candidate selection becomes critical to successful identification. The main steps in candidate identification and selection are discussed in this chapter, including examples of programs and strategies available. Improvements in the ability to share data between institutes and the selection criteria for candidate structures are needed to take advantage of recent analytical developments and further enhance structure elucidation in EDA studies.
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Abbreviations
- ACD:
-
Advanced Chemistry Development Inc.
- AMDIS:
-
Automated Mass Spectral Deconvolution and Identification System
- AQI:
-
Assignment Quality Index
- BP:
-
Boiling Point
- CAS Number:
-
Chemical Abstract Services Registry Number
- Da:
-
Dalton (atomic mass unit)
- EDA:
-
Effect-Directed Analysis
- EI-MS:
-
Electron Impact Mass Spectrometry
- EEI:
-
Even Electron Ions
- ElCoCo:
-
Elemental Composition Computation
- EMPOMASS:
-
Database of Mass Spectra of Unknown or Provisionally Identified Substances (NORMAN)
- ESI–FT–MS:
-
Electrospray Ionization–Fourier Transform–Mass Spectrometry
- ESI–QToF-MS:
-
Electrospray Ionization–Quadrupole Time-of-Flight Mass Spectrometry
- GS–MS:
-
Gas Chromatography–Mass Spectrometry
- 2HA:
-
2-hydroxy-9,10-anthraquinone
- HR-MS:
-
High Resolution Mass Spectrometry
- IQ:
-
2-amino-3-methyl-3H-imidazo(4,5-f)quinoline
- K:
-
Kelvin
- KRI:
-
Kovat’s Retention Index
- LC:
-
Liquid Chromatography
- LSERs:
-
Linear Solvation Energy Relationships
- LRI:
-
Lee Retention Index
- “M”-peak:
-
Mass Spectrometric Molecular Ion Mass Peak
- MALDI–ToF-MS:
-
Matrix-Assisted Laser Desorption/Ionization–Time-of-Flight Mass Spectrometry
- MODELKEY:
-
Models for Assessing and Forecasting the Impact of Environmental Key Pollutants on Marine and Freshwater Ecosystems and Biodiversity (EU project)
- MOLGEN:
-
Molecular Structure Generator
- MS:
-
Mass Spectrometry
- MS-MS:
-
Tandem Mass Spectrometry
- MSn :
-
Multistage Mass Spectrometry
- MV:
-
Match Value
- m/z:
-
Mass-to-charge ratio
- 1NP:
-
1-nitropyrene
- NIST:
-
National Institute of Standards and Technology
- NORMAN:
-
Network of Reference Laboratories for Emerging Pollutants
- OEI:
-
Odd Electron Ions
- PAH:
-
Polycyclic Aromatic Hydrocarbons
- QPID:
-
Quality Peak Identification Database
- QSAR:
-
Quantitative Structure-Activity Relationship
- Q-ToF:
-
Quadrupole Time-of-Flight Spectrometry
- RDB:
-
Ring and Double Bond
- RI:
-
Retention Index
- RP-HPLC:
-
Reversed Phase High Performance Liquid Chromatography
- TIE:
-
Toxicity Identification Evaluation
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Acknowledgments
This chapter was supported by the European Commission through the Integrated Project MODELKEY (Contract No. 511237-GOCE). Our thanks go to Dr. M. Meringer, Prof. A. Kerber, and colleagues for on-going use and development of the MOLGEN series of programs, to C. Gallampois for the measurement data and to Dr. K. Thomas for reviewing the document.
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Schymanski, E., Schulze, T., Hermans, J., Brack, W. (2011). Computer Tools for Structure Elucidation in Effect-Directed Analysis. In: Brack, W. (eds) Effect-Directed Analysis of Complex Environmental Contamination. The Handbook of Environmental Chemistry(), vol 15. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18384-3_8
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