The new face of isotopic NMR at natural abundance
Copyright © 2016 John Wiley & Sons, Ltd.
| Veröffentlicht in: | Magnetic resonance in chemistry : MRC. - 1985. - 55(2017), 2 vom: 15. Feb., Seite 77-90 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2017
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| Zugriff auf das übergeordnete Werk: | Magnetic resonance in chemistry : MRC |
| Schlagworte: | Journal Article Position-Specific Isotope Analysis SNIF-NMR internal standard irm-NMR isotope analysis |
| Zusammenfassung: | Copyright © 2016 John Wiley & Sons, Ltd. The most widely used method for isotope analysis at natural abundance is isotope ratio monitoring by Mass Spectrometry (irm-MS) which provides bulk isotopic composition in 2 H, 13 C, 15 N, 18 O or 34 S. However, in the 1980s, the direct access to Site-specific Natural Isotope Fractionation by Nuclear Magnetic Resonance (SNIF-NMRTM ) was immediately recognized as a powerful technique to authenticate the origin of natural or synthetic products. The initial - and still most popular - application consisted in detecting the chaptalization of wines by irm-2 H NMR. The approach has been extended to a wide range of methodologies over the last decade, paving the way to a wide range of applications, not only in the field of authentication but also to study metabolism. In particular, the emerging irm-13 C NMR approach delivers direct access to position-specific 13 C isotope content at natural abundance. After highlighting the application scope of irm-NMR (2 H and 13 C), this article describes the major improvements which made possible to reach the required accuracy of 1‰ (0.1%) in irm-13 C NMR. The last part of the manuscript summarizes the different steps to perform isotope analysis as a function of the sample properties (concentration, peak overlap) and the kind of targeted isotopic information (authentication, affiliation). Copyright © 2016 John Wiley & Sons, Ltd |
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| Beschreibung: | Date Completed 05.03.2018 Date Revised 05.03.2018 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1097-458X |
| DOI: | 10.1002/mrc.4548 |