Inhomogeneity-free heteronuclear iMQC

Area of Science:

• Nuclear Magnetic Resonance (NMR) Spectroscopy
• Hyperpolarized Chemistry
• Medical Imaging

Background:

• Intermolecular dipolar interactions between proton and carbon spins enable sensitive indirect detection of carbon spectra.
• Heteronuclear intermolecular multiple quantum coherence (iMQC) experiments offer high sensitivity but can be limited by line broadening.
• Homonuclear zero-quantum coherences provide line narrowing but lack the sensitivity of iMQC.

Purpose of the Study:

• To present a modified NMR sequence combining the high sensitivity of iMQC with the line narrowing capabilities of homonuclear zero-quantum coherences.
• To demonstrate the utility of this new sequence for obtaining high-resolution carbon-13 spectra.
• To explore applications in water-hyperpolarized carbon imaging.

Main Methods:

• Development and implementation of a modified NMR sequence.
• Acquisition of carbon-13 spectra from both thermal and hyperpolarized samples.
• Testing the sequence's performance under magnetic field inhomogeneities.

Main Results:

• The modified sequence achieves high sensitivity comparable to iMQC experiments.
• The sequence effectively narrows spectral lines, overcoming limitations of standard iMQC.
• High-resolution carbon-13 spectra were obtained from samples with magnetic field inhomogeneities.
• Successful demonstration of potential applications in water-hyperpolarized carbon imaging.

Conclusions:

• The developed NMR sequence offers a significant advancement for sensitive and high-resolution carbon-13 spectroscopy.
• This technique is robust in the presence of magnetic field inhomogeneities, broadening its applicability.
• The findings pave the way for improved applications in areas such as hyperpolarized imaging.