Antioxidant and antitumor promoting activities of the flavonoids from Hedychium thyrsiforme

• Main Authors: Karim, Jasril, Lim, Yang Mooi, Lajis, Nordin, Ali, Abdul Manaf, Sukari, Mohd Aspollah, Rahman, A. A., Othman, A. G., Kikuzaki, Hiroe, Nakatani, Nobuji
• Format: Article
• Language: English; English
• Published: Taylor & Francis 2003
• Online Access: http://psasir.upm.edu.my/id/eprint/40438/1/Antioxidant%20and%20antitumor%20promoting%20activities%20of%20the%20flavonoids%20from%20Hedychium%20thyrsiforme.pdf; http://psasir.upm.edu.my/id/eprint/40438/7/Antioxidant%20and%20Antitumor%20Promoting%20Activities%20of%20the%20Flavonoids%20from%20Hedychium%20thyrsiforme.pdf; http://psasir.upm.edu.my/id/eprint/40438/; http://www.tandfonline.com/doi/abs/10.1080/13880200308951344
• Institution: Universiti Putra Malaysia

Five flavonoids, including 3,7,4′-trimethoxy-5-hydroxyflavone (1), 3,4′-dimethoxy-5,7-dihydroxyflavone (2), 5,7,4′-trimethoxy-3-hydroxyflavone (3), 3,5,7,4′-tetramethoxyflavone (4), and 7,4′-dimethoxy-3,5-dihydroxyflavone (5), were isolated from the rhizome of Hedychium thyrsiforme and assayed for antioxidant and antitumor promoting activities. The antioxidant assays showed that 5,7,4′-trimethoxy-3-hydroxyflavone, 7,4′-dimethoxy-3,5-dihydroxyflavone and 3,4′-dimethoxy-5,7-dihydroxyflavone had strong activities. Only two compounds, 5,7,4′-trimethoxy-3-hychoxyflavone and 7,4′-dimethoxy-3,5-dihydroxyflavone, were found to be strong 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavengers with fifty percent inhibition concentration (IC50) values of 92 and 119 μM, respectively. Antitumor promoting assays indicated that all the flavonoids showed strong inhibition activity towards Epstein-Barr virus (EBV) activation in Raji cells.