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Diffusion measurements with continuous hydrogenation in PHIP.

S Bussandri1, L Buljubasich1, R H Acosta1

  • 1Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, Córdoba, Argentina; CONICET, Instituto de Física Enrique Gaviola (IFEG), Córdoba, Argentina.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 8, 2020
PubMed
Summary
This summary is machine-generated.

Hyperpolarized Nuclear Magnetic Resonance (NMR) using ParaHydrogen Induced Polarization (PHIP) enhances signal for dilute mixtures. This method, using hollow membranes and specific NMR sequences, enables 2D experiments for improved analysis.

Keywords:
DOSYDiffusionDouble PSGEHyperpolarizationJ-couplingNMRPHIPPSGESpin dynamics

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Area of Science:

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

Background:

  • DOSY (Diffusion Ordered SpectroscopY) NMR is crucial for mixture component separation based on diffusion coefficients.
  • Low signal-to-noise ratios (SNR) in dilute mixtures limit DOSY's applicability, requiring lengthy acquisition times.
  • ParaHydrogen Induced Polarization (PHIP) offers a potential solution by significantly boosting NMR signal intensity.

Purpose of the Study:

  • To investigate the feasibility of using PHIP to overcome SNR limitations in DOSY NMR for dilute mixtures.
  • To establish reproducible hyperpolarization conditions suitable for 2D NMR experiments.
  • To optimize experimental parameters for PHIP-enhanced DOSY NMR.

Main Methods:

  • Utilized hollow membranes and controlled gas flow to achieve consistent para-hydrogen induced polarization (PHIP).
  • Employed a Double Pulsed Gradient Spin Echo (DPGSE) NMR sequence to account for convection induced by pressure gradients.
  • Investigated the impact of J-coupling evolution on the DPGSE sequence through numerical simulations and experimental validation to determine optimal echo times.

Main Results:

  • Demonstrated that stable PHIP can be maintained for durations sufficient for 2D NMR experiments.
  • Successfully implemented a DPGSE sequence to mitigate artifacts caused by convection.
  • Identified optimal echo times by analyzing J-coupling effects, enhancing spectral quality.
  • Explored the method's utility with low-intensity polarized signals by adjusting reaction rates.

Conclusions:

  • PHIP, combined with hollow membrane technology and optimized DPGSE sequences, effectively enhances SNR for DOSY NMR.
  • This approach significantly improves the analysis of dilute mixtures, overcoming previous limitations.
  • The developed methodology provides a robust tool for advanced NMR studies of challenging samples.