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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

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Solid effect dynamic nuclear polarization and polarization pathways.

Albert A Smith1, Björn Corzilius, Alexander B Barnes

  • 1Department of Chemistry and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

The Journal of Chemical Physics
|January 14, 2012
PubMed
Summary
This summary is machine-generated.

This study demonstrates a 94-fold solid-effect dynamic nuclear polarization (DNP) enhancement using trityl radicals, achieving a 128-fold sensitivity gain. Higher microwave fields promise further sensitivity improvements in DNP NMR.

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Area of Science:

  • Magnetic Resonance Spectroscopy
  • Physical Chemistry
  • Materials Science

Background:

  • Dynamic Nuclear Polarization (DNP) significantly enhances Nuclear Magnetic Resonance (NMR) sensitivity.
  • Solid-state DNP often relies on microwave irradiation to polarize electron spins, which then transfer polarization to nuclear spins.
  • Understanding polarization transfer mechanisms is crucial for optimizing DNP performance.

Purpose of the Study:

  • To investigate the solid-effect DNP mechanism using trityl radicals.
  • To quantify the sensitivity enhancement achievable with varying microwave field strengths.
  • To elucidate the pathways of polarization transfer in DNP.

Main Methods:

  • Utilized dynamic nuclear polarization (DNP) instrumentation with a microwave cavity and balanced rf circuit.
  • Performed experiments at 5 Tesla and 80 Kelvin using trityl radical as the polarizing agent.
  • Measured polarization buildup rates and enhancements as a function of microwave field strength.

Main Results:

  • Achieved a solid-effect DNP enhancement of 94 and a sensitivity gain of 128 at 5 T and 80 K.
  • Observed that the buildup rate of the solid effect increases with microwave field strength.
  • Demonstrated that direct electron-to-nucleus polarization transfer is the dominant mechanism.

Conclusions:

  • Higher microwave field strengths are expected to yield further sensitivity improvements in DNP NMR.
  • The major contribution to bulk polarization arises from direct electron spin transfer.
  • A model predicting polarization attenuation due to nearby nuclear spin relaxation was supported.