Summary
Methyl esters of the pentafluoropropionyl-amino acid derivatives of the tetrafunctional, sulphur-bridged, stereoisomeric lanthionines, cystathionines and β-methyl-lanthionines were resolved on glass capillaries coated with the chiral stationary phase N-propionyl-L-valine-N-tert-butylamide-polysiloxane (Chirasil-Val) within 35min. Interestingly, L-cystathionine elutes before its D-enantiomer in contrast to the usual order of emergence on an L-phase. The method was applied to the polypeptide antibiotic nisin, which contains mesolanthionine and 2S,3S,6R-3-methyl-lanthionine.
N-Pentafluoropropionyl-S-alkylthiocysteine methyl esters (R=methyl, ethyl, n- and iso-propyl, n- and sec-butyl, n-octyl, neo-pentyl, cyclohexyl-, benzyl-, tolyl-) were separated on Chirasil-Val within 30min. The identity of all derivatives was shown by combined gas chromatography-mass spectrometry.
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Küsters, E., Allgaier, H., Jung, G. et al. Resolution of sulphur-containing amino acids by chiral phase gas chromatography. Chromatographia 18, 287–293 (1984). https://doi.org/10.1007/BF02259079
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DOI: https://doi.org/10.1007/BF02259079