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Tensioactive Compounds from the Aquatic Plant Ranunculus fluitans L. (Ranunculaceae)
Author(s) -
Wegner Christian,
Hamburger Matthias,
Kunert Olaf,
Haslinger Ernst
Publication year - 2000
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/1522-2675(20000705)83:7<1454::aid-hlca1454>3.0.co;2-7
Subject(s) - chemistry , ranunculaceae , hederagenin , triterpene , saponin , oleanane , oleanolic acid , stereochemistry , botany , ranunculus , terpenoid , chromatography , biology , medicine , alternative medicine , pathology
In the search for the cause for the formation of persistent foam in the Rhine River below the Rhine Fall at Schaffhausen, an investigation of the tensioactive principles from the aquatic plant Ranunculus fluitans L. ( Ranunculaceae ) was carried out. Two new (see 1 and 2 ) and four known bisdesmosidic triterpene saponins (see 4 – 6 ) were isolated along with the two known diacylglycerol galactosides 7 and 8 . The saponin structures were established by the identification of the aglycon and sugar moieties by HPLC and chiral capillary zone electrophoresis (CZE), ion‐spray LC/MS and extensive 1‐ and 2D homo‐ and heteronuclear NMR spectroscopy. The structures of the new oleanane‐type saponins were identified as 3‐ O ‐[ β ‐ D ‐glucopyranosyl‐(1→3)‐ α ‐ L ‐arabinopyranosyl]‐28‐ O ‐[ α ‐ L ‐rhamnopyranosyl‐(1→4)‐ β ‐ D ‐glucopyranosyl‐(1→6)‐ β ‐ D ‐glucopyranosyl]hederagenin ( 1 ) and 3‐ O ‐[ β ‐ D ‐glucopyranosyl‐(1→3)‐ β ‐ D ‐glucopyranosyl]oleanolic acid [ α ‐ L ‐rhamnopyranosyl‐(1→4)‐ β ‐ D ‐glucopyranosyl‐(1→6)‐ β ‐ D ‐glucopyranosyl] ester ( 2 ). LC/MS Studies of tensioactive fractions revealed the presence of additional glycoglycerolipids.