Hyperpolarized fumarate via parahydrogen

Area of Science:

• Nuclear Magnetic Resonance (NMR) spectroscopy
• Hyperpolarization techniques
• Catalysis

Background:

• Nuclear spin singlet states offer unique properties for NMR signal enhancement.
• Parahydrogen-induced polarization (PHIP) is a powerful technique for increasing NMR sensitivity.
• Developing efficient methods for producing hyperpolarized molecules is crucial for advanced applications.

Purpose of the Study:

• To produce hyperpolarized [1-¹³C]fumarate in the proton nuclear spin singlet state.
• To utilize parahydrogen and a ruthenium catalyst for efficient polarization.
• To achieve significant signal enhancement for ¹³C NMR.

Main Methods:

• Pairwise trans-addition of parahydrogen to a molecular precursor in water.
• Employing a ruthenium-based catalyst for the reaction.
• Using radiofrequency pulses to convert proton singlet state to observable carbon magnetization.

Main Results:

• Successful production of hyperpolarized [1-¹³C]fumarate.
• Achieved a 1000-fold enhancement of the ¹³C signal.
• Demonstrated the utility of 50% para-enriched hydrogen gas.

Conclusions:

• This study presents an effective method for generating hyperpolarized [1-¹³C]fumarate.
• The developed technique offers a substantial increase in NMR signal sensitivity.
• This advancement has potential implications for metabolic imaging and other NMR-based applications.