Structural determination of 6-C-diglycosyl-8-C-glycosyl-flavones and 6-C-glycosyl-8-C-diglycosylflavones by mass spectrometry of their permethyl ethers |
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Authors: | ML Bouillant FFerreres de Arce J Favre-Bonvin J Chopin A Zoll G Mathieu |
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Institution: | 1. Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Dijon, 21033 Dijon Cedex, France |
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Abstract: | Permethylated 6-C-diglycosyl-8-C-glycosylflavones and 6-C-glycosyl-8-C-diglycosylflavones gave well defined EIMS including the molecular peak and a fragmentation pattern characteristic of the 6-C-glycosyl residue. X″′-O-glycosides (8-C-disaccharides) are thus easily distinguished from X″-O-glycosides (6-C-disaccharides) and, in the latter, the position of the O-glycosidic bond should be deduced from the MS, after acid hydrolysis. Three new C-glycosylflavones have been characterized in this way from Spergularia rubra and Stellaria holostea. |
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Keywords: | Caryophyllaceae permethyl ethers EIMS |
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