¹²⁹Xe NMR-based sensors: biological applications and recent methods

Area of Science:

• Nuclear Magnetic Resonance (NMR) Spectroscopy
• Medical Imaging
• Biophysics

Background:

• Xenon's large polarizable electron cloud makes it sensitive to environmental changes.
• NMR parameters are significantly modified by minor alterations in xenon's local surroundings.
• Xenon's utility as a biological sensor is gaining traction.

Purpose of the Study:

• To explore xenon's potential as a sensitive molecular imaging agent.
• To highlight methods for enhancing xenon's NMR signal and targeting capabilities.
• To present xenon-based molecular imaging as a powerful new approach.

Main Methods:

• Utilizing xenon's inherent sensitivity to environmental changes for biological sensing.
• Employing spin-exchange optical pumping to enhance xenon NMR signal by orders of magnitude.
• Vectorizing xenon using functionalized host systems for targeted delivery.
• Integrating advanced detection methods for sub-nanomolar concentration detection.

Main Results:

• Xenon's signal enhancement through spin-exchange optical pumping.
• Successful vectorization of xenon to specific targets via functionalized hosts.
• Detection of targets at sub-nanomolar concentrations.
• Demonstration of systematic xenon delivery multiple times post-host introduction.

Conclusions:

• Xenon is a highly effective sensor for biological events due to its environmental sensitivity.
• Spin-exchange optical pumping and functionalized host systems enable sensitive, targeted molecular imaging with xenon.
• Xenon-based molecular imaging offers a powerful and versatile approach for biological detection.