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