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Rapid-melt Dynamic Nuclear Polarization.

M Sharma1, G Janssen1, J Leggett1

  • 1Institute for Molecules and Materials, Solid State NMR, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 31, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a novel rapid melting technique for Dynamic Nuclear Polarization (DNP) to boost Nuclear Magnetic Resonance (NMR) sensitivity. This method enhances liquid-state NMR detection for small samples, enabling picomole-level molecule detection.

Keywords:
Dynamic Nuclear Polarization (DNP)Nuclear magnetic resonance (NMR)Stripline NMR

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Hyperpolarization Techniques

Background:

  • Low sensitivity is a major limitation in Nuclear Magnetic Resonance (NMR).
  • Dynamic Nuclear Polarization (DNP) has re-emerged as a powerful technique to enhance NMR sensitivity.
  • Existing DNP methods often require specialized setups or are not optimized for small sample volumes.

Purpose of the Study:

  • To present a novel approach for DNP-enhanced liquid-state NMR using rapid melting of solid hyperpolarized samples.
  • To demonstrate the applicability of this method to microfluidic setups with small sample volumes (10nl to 1μl).
  • To achieve high sensitivity and fast acquisition for structural analysis and quantitative measurements.

Main Methods:

  • Development of a microfluidic setup for rapid melting of solid DNP-polarized samples.
  • Integration of solid-state DNP polarization with 'in situ' liquid-state 1H NMR detection using stripline technology.
  • Utilizing fast cycling for signal averaging and 2D structural analysis.
  • Testing with TEMPOL radicals in H2O/D2O/d6-glycerol and BDPA radicals in toluene.

Main Results:

  • Achieved solid-state 1H enhancement factors up to 500 with TEMPOL radicals.
  • Obtained proton enhancement factors up to 400 in toluene with BDPA radicals, showing negligible relaxation losses.
  • Demonstrated a total recycling delay of approximately 5 seconds, including polarization and melting.
  • Enabled fast determination of hyper-polarization as a function of microwave frequency and power.
  • Facilitated detection of molecules in the picomole regime even at 3.4T.

Conclusions:

  • The rapid melting DNP method significantly enhances sensitivity in liquid-state NMR for microfluidic applications.
  • This technique offers a versatile and efficient approach for analyzing small sample quantities.
  • The method holds promise for sensitive detection and structural analysis in various fields requiring NMR spectroscopy.