Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities
Hussein, M., Mostafa, E., El-Ghaly, E., Ragab, E. (2011). Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities. EKB Journal Management System, 20(1), 22-29. doi: 10.21608/zjps.2011.167340
Mohammed Hussein; Ehab Mostafa; El-Sayed El-Ghaly; Ehab Ragab. "Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities". EKB Journal Management System, 20, 1, 2011, 22-29. doi: 10.21608/zjps.2011.167340
Hussein, M., Mostafa, E., El-Ghaly, E., Ragab, E. (2011). 'Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities', EKB Journal Management System, 20(1), pp. 22-29. doi: 10.21608/zjps.2011.167340
Hussein, M., Mostafa, E., El-Ghaly, E., Ragab, E. Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities. EKB Journal Management System, 2011; 20(1): 22-29. doi: 10.21608/zjps.2011.167340

Phenolic constituents from the leaves of Tylophora indica and their antioxidant activities

Zagazig Journal of Pharmaceutical Sciences
Article 3, Volume 20, Issue 1, June 2011, Pages 22-29    PDF (2.47 M)
Document Type: Original Article
DOI: 10.21608/zjps.2011.167340
Authors
Mohammed Hussein* ; Ehab Mostafa; El-Sayed El-Ghaly; Ehab Ragab
Department of Pharmacognosy, Faculty of Pharmacy, Al-Azhar University, Cairo, Egypt
Abstract
Four flavonoids; kaempferol-3-O-galactoside (trifolin) [1], quercetin-3-O-galactoside (hyperoside) [2], quercetin-3-O- glucoside (isoquercitrin) [3] and kaempferol-3-O-rutinoside [4] together with chlorogenic acid [5] and chlorogenic acid methyl ester [6] have been isolated and purified for the first time from the leaves of Tylophora indica by HPLC. The structures were elucidated by the application of MS, IR, UV, ID- and 2D-NMR spectroscopic analyses and by comparison with literature data. All compounds 1-6 were found to exhibit antioxidant effects, based on the scavenging activity of the stable 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical.
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