Pulsed supersonic beams with nucleobases

Area of Science:

• Physical Chemistry
• Biochemistry
• Chemical Engineering

Background:

• Supercritical fluids offer unique solvent properties for sensitive compounds.
• Pulsed molecular beam mass spectrometry enables gas-phase analysis of thermally unstable molecules.
• Nucleobases are fundamental to life and have pharmaceutical relevance.

Purpose of the Study:

• To investigate the dissolution of primary nucleobases (adenine, guanine, cytosine, thymine, uracil) in supercritical ethylene.
• To assess the influence of a cosolvent (ethanol) on nucleobase solubility and transfer into the gas phase.
• To evaluate the potential of supercritical fluid technology for pharmaceutical applications.

Main Methods:

• Utilizing pulsed molecular beam mass spectrometry to analyze solutes in the gas phase.
• Employing supercritical ethylene with ethanol as a cosolvent.
• Expanding solutions from supercritical pressures into high vacuum via a customized pulsed nozzle at 313 K.

Main Results:

• The study successfully transferred nucleobases into the gas phase from supercritical ethylene.
• Results indicate a significant influence of ethanol as a cosolvent on nucleobase dissolution.
• Relative amounts of solute, solvent, and cosolvent were monitored in the supersonic beam.

Conclusions:

• Supercritical fluid technology, particularly with cosolvents, is a viable method for handling thermally sensitive nucleobases.
• The findings support the application of this technique in pharmaceutical and biomedical fields.
• Cosolvent choice is critical for optimizing nucleobase dissolution in supercritical fluids.