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Principles of Identification Read chapter Read first chapter

2011 | OriginalPaper | Chapter

7. Non-target Identification. Chromatography and Spectrometry

Author : Boris L. Milman

Published in: Chemical Identification and its Quality Assurance

Publisher: Springer Berlin Heidelberg

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Abstract

The content of this chapter are focused on unknown analysis when a chemist answers the question of what compounds are present in the sample. The true result of identification is provided by at least two independent (orthogonal) methods. The most general approach to the identification of non-targets is based on chromatography mass spectrometry. Gas chromatographic parameters, widely used for identification, are retention indices. To a lesser degree, retention indices are applicable in liquid chromatography. Now, retention parameters are required in proteomics. In mass spectrometry, volatile analytes are preferably identified by means of reference libraries of electron ionization mass spectra. For identification of nonvolatile compounds, libraries of tandem/product mass spectra have been built. Their use is especially effective when combined with high-resolution mass spectrometry which provides candidate molecular formulas. Interpretation of mass spectra is also possible but not widely applied. NMR and IR spectroscopy are comparable to MS in identification potential if there are a relatively large amount of analytes and a simple composition of a sample under analysis. In NMR, algorithms of spectral prediction as well as respective spectral databases have been rapidly developed. Analytical metabolomics and proteomics are individually discussed, with the focus on approaches to identification, identification criteria, the problems arising due to a great complexity of analytes and unavailability of analytical standards, and interlaboratory comparisons. For all the techniques, information about reference spectral libraries/databases is tabled. Quality assurance of identification is widely covered in the chapter.

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previous chapter Prior Data for Non-target Identification
next chapter Chemical Qualitative Analysis II
Footnotes
1
Multi-analyte determination, e.g., in metabolomics (Sects. 7.4.1.3 and 7.7.1), is far more challenging.
 
2
A collection of RT can be also used for identification if they are perfectly reproduced [7].
 
3
Interlaboratory comparison resulted in the lower rate, but the test spectra sample was very small [105].
 
4
The largest collection [120] (see Table 7.8) was reported without many details about this home library.
 
5
The MS2 spectrum with a few peaks is sometimes considered as of low quality [129]. However, this may be just a case of fragmentation where one or a few reactions prevail.
 
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Metadata
Title
Non-target Identification. Chromatography and Spectrometry
Author
Boris L. Milman
Copyright Year
2011
Publisher
Springer Berlin Heidelberg
Book
Chemical Identification and its Quality Assurance

Print ISBN: 978-3-642-15360-0

Electronic ISBN: 978-3-642-15361-7

Copyright Year: 2011

DOI
https://doi.org/10.1007/978-3-642-15361-7_7

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