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  Reaction Monitoring of Aliphatic Amines in Supercritical Carbon Dioxide by Proton Nuclear Magnetic Resonance Spectroscopy and Implications for Supercritical Fluid Chromatography

Fischer, H., Gyllenhaal O, Vessman, J., & Albert, K. (2003). Reaction Monitoring of Aliphatic Amines in Supercritical Carbon Dioxide by Proton Nuclear Magnetic Resonance Spectroscopy and Implications for Supercritical Fluid Chromatography. Analytical Chemistry, 75(3), 622-626. Retrieved from http://pubs.acs.org/cgi-bin/article.cgi/ancham/2003/75/i03/pdf/ac020527p.pdf.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DD7A-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DD7B-C
Genre: Journal Article

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Fischer, HH1, Author              
Gyllenhaal O, Vessman, J, Author
Albert, K, Author
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: In the recent years, it has repeatedly been stated that amines react with CO2 and can therefore not be chromatographed under supercritical conditions with CO2. The aim of the present work is to elucidate the structural requirements and conditions that can lead to the reaction of an amine analyte with CO2 and, if this occurs, the structure of the formed product. The use of NMR spectroscopy with a flow probe for supercritical fluid chromatography enables the investigation of these unstable analytes in supercritical mediums. Several alkyl-substituted secondary benzylamines and some primary aromatic amines were dissolved in supercritical CO2 and investigated by employing on-line SFC-1H NMR spectroscopy. It was found that the condition of carbamic acid formation depends on the steric properties of the substituents of the amine. A 2-isopropylamino alcohol compound, metoprolol, was also investigated with the setup. No carbamic acid could be detected with the present conditions.

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 Dates: 2003
 Publication Status: Published in print
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Title: Analytical Chemistry
Source Genre: Journal
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Pages: - Volume / Issue: 75 (3) Sequence Number: - Start / End Page: 622 - 626 Identifier: -