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Other Nuclides: 31P, 19F, 15N NMR

Other Nuclides: ³¹P, ¹⁹F, ¹⁵N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...

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18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor SiFA for Positron Emission Tomography

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Optimizing fluorine labelling for ¹⁹F solid-state NMR in oriented biological systems.

Ian M Robertson¹, Brittney A Klein², Brian D Sykes³

¹Ministry of Health, Government of Alberta, Edmonton, AB, T5J 1S6, Canada.

Journal of Biomolecular NMR

|January 9, 2020

Summary

This study characterizes aromatic fluorine compounds using ¹⁹F solid-state NMR (ssNMR) in lipid bilayers. Findings help optimize fluorine labeling strategies for studying biomolecular structure and dynamics in biological systems.

Keywords:

19F NMR Chemical shift anisotropy Fluorine labelling Solid-state NMR

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Area of Science:

Biophysical Chemistry
Solid-State Nuclear Magnetic Resonance (ssNMR) Spectroscopy
Chemical Biology

Background:

¹⁹F solid-state NMR (ssNMR) is a powerful technique for investigating biomolecular structure and dynamics.
Effective fluorine labeling is crucial for successful ¹⁹F ssNMR studies.
Characterizing fluorine labels in model systems is essential before complex biological applications.

Purpose of the Study:

To characterize the ¹⁹F ssNMR properties of selected aromatic fluorine compounds.
To evaluate the influence of fluorine atom arrangement on NMR characteristics.
To guide the selection of optimal fluorine labels for in situ studies in oriented biological systems.

Main Methods:

Utilized ¹⁹F solid-state NMR (ssNMR) spectroscopy.
Investigated fluorine-labeled aromatic compounds within dimyristoylphosphatidylcholine (DMPC) lipid bilayers.
Analyzed NMR parameters to assess label properties.

Main Results:

Demonstrated distinct ¹⁹F ssNMR spectral features for different aromatic fluorine compounds.
Showcased the impact of fluorine nucleus placement on spectral characteristics.
Provided insights into the behavior of fluorine labels in a membrane-mimetic environment.

Conclusions:

The characterization of fluorine labels in model membranes is vital for designing effective labeling strategies.
Understanding label properties aids in selecting optimal fluorine arrangements for complex biological ssNMR studies.
This work facilitates the application of ¹⁹F ssNMR for in situ structural and dynamic investigations.