Acylated flavone C-glycosides from Cucumis sativus

• Published in: Phytochemistry (Oxford) 2001-09, Vol.58 (1), p.167-172
• Main Authors: Abou-Zaid, Mamdouh M., Lombardo, Domenic A., Kite, Geoffrey C., Grayer, Renée J., Veitch, Nigel C.
• Format: Article
• Language: English
• Subjects: Acylated flavone C-glycosides; Acylation; Biological and medical sciences; Chemical constitution; Chromatography, High Pressure Liquid; Coumaric Acids - chemistry; Coumaric Acids - isolation & purification; Cucumber; Cucumis sativus; Cucumis sativus - chemistry; Cucumis sativus - growth & development; Cucurbitaceae; Dimethyl Sulfoxide; Flavonoids - chemistry; Flavonoids - isolation & purification; Fundamental and applied biological sciences. Psychology; Fungal plant pathogens; Glycosides - chemistry; Glycosides - isolation & purification; Magnetic Resonance Spectroscopy; Models, Molecular; Molecular Conformation; Molecular Structure; Pathology, epidemiology, host-fungus relationships. Damages, economic importance; Phytopathology. Animal pests. Plant and forest protection; Plant Leaves - chemistry; Plant Leaves - growth & development; Plant physiology and development; Silicon; Spectrophotometry, Ultraviolet
• ISSN: 0031-9422; 1873-3700
• DOI: 10.1016/S0031-9422(01)00156-X

Leaves of Cucumis sativus plants treated with silicon and infected with Sphaerotheca fuliginea yielded five new acylated flavone C-glycosides identified as isovitexin 2″- O-(6‴-( E)- p-coumaroyl)glucoside ( 6), isovitexin 2″- O-(6‴-( E)- p-coumaroyl)glucoside-4′- O-glucoside ( 7), isovitexin 2″- O-(6‴-( E)-feruloyl)glucoside-4′- O-glucoside ( 11), isoscoparin 2″- O-(6‴-( E)- p-coumaroyl)glucoside ( 9), and isoscoparin 2″- O-(6‴-( E)-feruloyl)glucoside-4′- O-glucoside ( 12). The known flavone-glycosides isovitexin ( 1), saponarin ( 2), saponarin 4′- O-glucoside ( 3), vicenin-2 ( 4), apigenin 7- O-(6″- O- p-coumaroylglucoside) ( 5), isovitexin 2″- O-(6‴-( E)-feruloyl)glucoside ( 8) and isoscoparin 2″- O-(6‴-( E)-feruloyl)glucoside ( 10), were also identified in this plant material. Five new acylated flavone C-glycosides have been identified in leaves of Cucumis sativus treated with Si and infected with Sphaerotheca fuliginea.