A glucosylated acylflavone from Sideritis raeseri

Antioxidant activity of flavonoids from Sideritis raeseri

“…raeseri Boiss et Heldr. (Gabrieli and Kokkalou, 1990a;Kokkalou and Gabrieli, 1997) and have studied the anti-inflammatory activity of this plant (Gabrieli et al, 1990b). In the present study we have investigated a sub-fraction of the methanolic extract, which contains nine 5,8-dihydroxy-flavone-7-oallosylglucosides.…”

Phytochemical Evaluation of Chrozophora rottleri (Geiseler) A. Juss. ex Spreng.

“…The trans sterochemistry of pcoumaric acid was concluded from concluding the trans stereochemistry of p-coumaric acid. The 13 C NMR spectrum with SEPT was confirmed the aglycone as apigenin, the sugar moiety identified as β-D-glucopyranose, the acyl group as trans p-coumaric acid and the site of glycosylation as C-7 which can be compared with the δ values of C-5"" and C-6"" of glucose with those of β-D-glucopyranose of apigenin 7-O-β-D-glucopyranoside (Gabrieli and Kokkalou, 1990). The site of take place at the site at C-6"" was decided by esterification of glucose.…”

Novel acylflavones from Sideritis syriaca ssp. syriaca

“…However, the absence of the UV characteristic band of an apigenin glucoside at 328 nm and the more lipophilic attitude of the compound indicated direct esterification on the apigenin aglycon. The hypsochromic shift of band I of the UV spectrum due to direct esterification on the flavonoid has been mentioned before (Azhar-ul-Haq, Malik, Khan, Shah, & Muhammad, 2004;Gabrieli & Kokkalou, 1990). The MS spectrum displayed a small molecular ion at 563 amu, the fragment of apigenin at m/z 271 and an intense fragment at m/z 147, characteristic of the p-coumaroyl moiety.…”

“…Analysis of the diethyl ether extract of the aerial parts of S. raeserii showed the presence of a glucosilated coumaroyl ester of apigenin, apigenin 7-(4-O-b-glycosyl-trans-p-coumarate) (Gabrieli & Kokkalou, 1990).…”