Comparative Study of the Antioxidative Potential of Common Natural Flavonoids and Isoflavonoids
2013
Pandey, Ramesh Prasad., Sunmoon University, Chungnam, Republic of Korea | Koirala, Niranjan., Sunmoon University, Chungnam, Republic of Korea | Lee, J.H., Sunmoon University, Chungnam, Republic of Korea | Lee, H.C., Sunmoon University, Chungnam, Republic of Korea | Sohong, J.K., Sunmoon University, Chungnam, Republic of Korea
The half maximal inhibitory concentration (IC₅₀) values and trolox equivalent antioxidant capacity (TEAC) values were calculated by a 2,2-diphenylpicrylhydrazyl (DPPH) assay and a 2,2'-azino-bis-3- ethylbenzothiazoline-6-sulfonic acid (ABTS⁺) assay, in order to determine the antioxidative activities of the compounds. On the basis of the DPPH assay, quercetin had the strongest antioxidative potential of the flavonoids, followed in order by fisetin, 7,8-dihydroxyflavone, morin and kaempferol. Quercetin, fisetin and 7,8-dihydroxyflavone had higher antioxidant potentials than butyl hydroxyl anisole. Quercetin had the highest TEAC value amongst the flavonoids and isoflavonoids, followed in order by 3- hydroxyflavone, fisetin, 7,8-dihydroxyflavone and morin. Comparatively, isoflavonoids were found to have significantly weaker antioxidative potential than the flavonoids.
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