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Two new asterosaponins from the starfish Asterias rubens: Application of a cryogenic NMR probe head

: Sandvoss, M.; Preiß, A.; Levsen, K.; Weisemann, R.; Spraul, M.


Magnetic resonance in chemistry 41 (2003), No.11, pp.949-954
ISSN: 0749-1581
Journal Article
Fraunhofer ITEM ()
starfish; asterias rubens; asterosaponin; cryogenic NMR probe; LC-NMR-MS; liquid chromatography; nuclear magnetic resonance spectroscopy

We report two new asterosaponins from the Baltic starfish Asterias rubens along with their 1H and 13C NMR data. The compounds were isolated after on-flow liquid chromatography-NMR-mass spectrometry screening indicated that they had not been identified before. The one- and two-dimensional NMR experiments used to elucidate the structures were recorded using a 5 mm cryogenic probe head. The advantages of cryogenic probes for this kind of examination in comparison with conventional probe heads are discussed.