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Related Experiment Videos

Chemically amplified 19F-1H nuclear Overhauser effects.

I Kuprov1, P J Hore

  • 1Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, UK.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 15, 2004
PubMed
Summary

Chemically induced dynamic nuclear polarisation enhances fluorine-19 nuclear magnetisation in 3-fluorotyrosine. This method boosts sensitivity for heteronuclear Overhauser effect experiments in NMR spectroscopy.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Nuclear hyperpolarisation significantly enhances NMR signal sensitivity.
  • Chemically induced dynamic nuclear polarisation (CIDNP) offers a pathway to achieve hyperpolarisation.
  • Heteronuclear Overhauser effects (NOEs) are crucial for structural and dynamic studies but often suffer from low sensitivity.

Purpose of the Study:

  • To explore chemically induced dynamic nuclear polarisation (CIDNP) as a source of nuclear hyperpolarisation for heteronuclear Overhauser effect experiments.
  • To investigate the enhancement of fluorine-19 ((19)F) nuclear magnetisation using CIDNP in 3-fluorotyrosine.
  • To assess the impact of CIDNP-induced hyperpolarisation on (19)F-(1)H cross-relaxation and cross-correlation effects.

Main Methods:

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  • Utilisation of a photochemical reaction proceeding through a radical pair intermediate.
  • Application of CIDNP to induce hyperpolarisation in (19)F nuclei within 3-fluorotyrosine.
  • Measurement of (19)F-(1)H cross-relaxation and cross-correlation effects before and after hyperpolarisation.

Main Results:

  • Achieved an enhancement of (19)F nuclear magnetisation in 3-fluorotyrosine by over an order of magnitude.
  • Observed a corresponding increase in the amplitudes of (19)F-(1)H cross-relaxation and cross-correlation effects.
  • Employed cyclic photochemical reactions that leave the sample chemically unchanged, ensuring sample integrity.

Conclusions:

  • CIDNP is a viable and effective method for generating nuclear hyperpolarisation for heteronuclear NMR experiments.
  • This approach significantly enhances the sensitivity of (19)F-(1)H interactions, particularly cross-relaxation and cross-correlation.
  • The findings suggest potential for improving the sensitivity of heteronuclear NOEs in (19)F-labelled proteins, advancing NMR applications in structural biology.