Abstract
Two new biflavonoids, daphnogirins A (1) and B (2), were obtained from the roots of Daphne giraldii. Their structures were established on the basis of the spectral data and X-ray diffraction data of the co-crystal of 1 and 2. Daphnogrins A and B have the same configuration at C-1 and opposite configurations at C-16 and C-17. Oxygen radical scavenging assay has indicated that they are of significant antioxidative activity.
MeSH terms
-
Antioxidants / chemistry
-
Chromans / chemistry
-
Crystallography, X-Ray
-
Daphne / chemistry*
-
Flavones / chemistry*
-
Fluorescein / chemistry
-
Free Radical Scavengers / chemistry
-
Magnetic Resonance Spectroscopy
-
Molecular Conformation
-
Plant Bark / chemistry
-
Plant Stems / chemistry
-
Reactive Oxygen Species / chemistry
-
Spectrometry, Mass, Fast Atom Bombardment
-
Spectrophotometry, Infrared
-
Spectrophotometry, Ultraviolet
Substances
-
Antioxidants
-
Chromans
-
Flavones
-
Free Radical Scavengers
-
Reactive Oxygen Species
-
daphnogirin A
-
daphnogirin B
-
6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid
-
Fluorescein