NMR-based isotopic and isotopomic analysis

Progress in Nuclear Magnetic Resonance Spectroscopy
Serge Akoka, Gérald S Remaud

Abstract

Molecules exist in different isotopic compositions and most of the processes, physical or chemical, in living systems cause selection between heavy and light isotopes. Thus, knowing the isotopic fractionation of the common atoms, such as H, C, N, O or S, at each step during a metabolic pathway allows the construction of a unique isotope profile that reflects its past history. Having access to the isotope abundance gives valuable clues about the (bio)chemical origin of biological or synthetic molecules. Whereas the isotope ratio measured by mass spectrometry provides a global isotope composition, quantitative NMR measures isotope ratios at individual positions within a molecule. We present here the requirements and the corresponding experimental strategies to use quantitative NMR for measuring intramolecular isotope profiles. After an introduction showing the historical evolution of NMR for measuring isotope ratios, the vocabulary and symbols - for describing the isotope content and quantifying its change - are defined. Then, the theoretical framework of very accurate quantitative NMR is presented as the principle of Isotope Ratio Measurement by NMR spectroscopy, including the practical aspects with nuclei other than 2H, that ha...Continue Reading

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Citations

Jan 17, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Barbara Pacholczyk-SienickaŁukasz Albrecht
Jan 13, 2021·Analytical Chemistry·H Surangi N JayawardenaMingdi Yan

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