Pulsed supersonic beams with nucleobases
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The dissolution of the primary nucleobases in supercritical fluids has been investigated using pulsed molecular beam mass spectrometry. Due to the low critical temperatures of ethylene and carbon dioxide, their adiabatic jet expansion permits transferring thermally sensitive solutes into the gas phase. This feature is particularly attractive for pharmaceutical and biomedical applications. In this study, adenine, guanine, cytosine, thymine, and uracil have been dissolved in supercritical ethylene with a few percent of ethanol as cosolvent. At source temperatures of 313 K, these solutions have been expanded from supercritical pressures into high vacuum using a customized pulsed nozzle. A mass spectrometer was used to monitor the relative amounts of solute, solvent, and cosolvent in the supersonic beam. The results suggest a paramount influence of the cosolvent.
KeywordsBiomolecules Nucleobases Solubility Supercritical fluids Supersonic beams
This work has been financially supported by grant CH262/5 from the Deutsche Forschungsgemeinschaft and also from the Max Planck Society through the “International Max Planck Research School: Complex Surfaces in Material Science” at the Fritz Haber Institute Berlin.
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