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(De)coding SABRE of [1-13C]pyruvate.

Salvatore Mamone1, Federico Floreani2, Ahmed Mohammed Faramawy2

  • 1Dept. MESVA (Life, Health & Environmental Sciences), Università dell'Aquila, Via Vetoio SNC, Localita' Coppito, 67100 L'Aquila, Italy.

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Summary
This summary is machine-generated.

Researchers optimized hyperpolarized pyruvate imaging using Signal Amplification by Reversible Exchange (SABRE). They designed new catalysts and developed a model showing exchange dynamics, not coupling strength, control polarization efficiency for better biomedical applications.

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Area of Science:

  • Magnetic Resonance Imaging
  • Hyperpolarized Contrast Agents
  • Catalysis

Background:

  • Hyperpolarized pyruvate is crucial for biomedical imaging, but efficient Signal Amplification by Reversible Exchange (SABRE) enhancement is challenging.
  • Existing methods struggle to maximize 13C polarization for pyruvate, limiting its diagnostic potential.

Purpose of the Study:

  • To comprehensively investigate and optimize SABRE hyperpolarization of pyruvate.
  • To explore novel iridium-NHC catalysts and understand the factors governing polarization efficiency.
  • To develop a predictive model for rational SABRE protocol design.

Main Methods:

  • Synthesis and testing of seven distinct iridium-NHC catalysts for pyruvate SABRE.
  • Density Functional Theory (DFT) calculations to analyze coupling strengths and binding geometries.
  • Variable-temperature experiments on free and catalyst-bound pyruvate.
  • Development of a detailed mechanistic model incorporating kinetics, concentrations, and relaxation.

Main Results:

  • IMes catalyst achieved ~3% 13C polarization (extrapolated to ~10% at 100% parahydrogen).
  • Alternative catalysts (IPr, SIPr) showed ~20% lower performance but enabled natural abundance 13C detection.
  • DFT and experimental data indicated exchange dynamics, not coupling strength, are key to polarization efficiency.
  • A novel temperature-jump protocol increased free pyruvate polarization by ~30%.

Conclusions:

  • Catalyst design and understanding exchange dynamics are critical for optimizing pyruvate SABRE.
  • The developed mechanistic model provides a predictive framework for SABRE systems.
  • The temperature-jump protocol offers a new strategy for enhancing free pyruvate signals in biomedical imaging.