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Caffeic Acid Glycoside Esters from Gratiola officinalis L.
Author(s) -
Rothenburger Jan,
Haslinger Ernst
Publication year - 1994
Publication title -
liebigs annalen der chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0170-2041
DOI - 10.1002/jlac.199419941110
Subject(s) - chemistry , caffeic acid , glycoside , hydrolysis , organic chemistry , verbascoside , monosaccharide , diastereomer , acid hydrolysis , officinalis , chromatography , sodium hydroxide , stereochemistry , antioxidant , botany , biology
Two caffeic acid glycoside esters, verbascoside and arenarioside, were isolated from “hedgehyssop” Gratiola officinalis L. Their structures were determined by several one‐and twodimensional NMR experiments. After hydrolysis with 2 N hydrochloric acid and 4% sodium hydroxide solution the components were identified by GC. The absolute configuration of the monosaccharides was determined by GC separation of the diastereomers which were obtained by glycosidation with ( S )‐(+)‐2‐butanol. An equilibrium between Z and E isomers was observed.