title: Antioxidant properties and antioxidant compounds of various extracts from the edible basidiomycete Grifola frondosa (Maitake).
abstract: Grifola frondosa is an edible mushroom currently available in Taiwan. Ethanolic, cold-water and hot-water extracts were prepared and their antioxidant properties were investigated. At 1 mg/mL, G. frondosa T1 and T2 cold-water extracts showed high reducing powers of 1.02 and 0.50, respectively. Chelating abilities on ferrous ions of G. frondosa T1 and T2 were higher for cold-water extracts than for ethanolic and hot-water extracts. For the scavenging ability on 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, G. frondosa T1 and T2 extracts were effective in the following order: ethanolic > hot-water > cold-water. The G. frondosa hot-water extract showed high scavenging ability on superoxide anions. Total phenols, flavonoids, ascorbic acid and α-tocopherol are the major antioxidant components found in the various G. frondosa extracts. Based on EC(50) values (<20 mg/mL) obtained, the various extracts from G. frondosa investigated in this study display potent antioxidative properties.
authors.affiliation: Department of Biotechnology, Asia University, Wufeng, Taichung County 41354, Taiwan.
authors.forename: Jan-Ying
authors.initials: JY
authors.lastname: Yeh
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Hsieh
authors.forename: Kaun-Tzer
authors.initials: KT
authors.lastname: Wu
authors.forename: Cheng-Fang
authors.initials: CF
authors.lastname: Tsai
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D016166:Free Radical Scavengers / Q000494:pharmacology*; D005978:Glutathione / Q000378:metabolism; D005979:Glutathione Peroxidase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D048691:Grifola / Q000737:chemistry*; D020128:Inhibitory Concentration 50; D014969:Xanthine Oxidase / Q000378:metabolism
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D002374:Catalase; D005979:Glutathione Peroxidase; D014969:Xanthine Oxidase; D005980:Glutathione Reductase; D005978:Glutathione