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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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Published on: October 30, 2012

Pulsed supersonic beams with nucleobases.

Adnan Sarfraz1, Klaus Rademann, Wolfgang Christen

  • 1Institut für Chemie, Humboldt-Universität zu Berlin, Berlin, Germany.

Analytical and Bioanalytical Chemistry
|August 17, 2012
PubMed
Summary
This summary is machine-generated.

Investigating nucleobase dissolution in supercritical fluids using mass spectrometry revealed that cosolvents significantly impact the process. This method is promising for pharmaceutical applications.

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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.