title: Gamma-irradiation improves the color and antioxidant properties of Chaga mushroom (Inonotus obliquus) extract.
abstract: The objective of this study was to evaluate the effect of ionizing radiation on color and antioxidative properties of Chaga mushroom (Inonotus obliquus) extract (CME). CME (10 mg/mL) was gamma-irradiated at 0, 3, 5, 7, and 10 kGy, and color, antioxidant activity, and total phenolic compound levels were then determined. The lightness and yellowness were increased (P < .05), and the redness was decreased (P < .05), as irradiation dose increased. The antioxidant parameters such as the 2-diphenyl-1-picrylhydrazyl, superoxide, and hydroxyl radical scavenging activities, ferric reducing/antioxidant power, and inhibition of lipid peroxidation increased as the irradiation dose increased. Also, the total phenolic compound levels of CME were increased (P < .05) by gamma-irradiation. These results suggest that gamma-irradiation could be considered a means for improving the antioxidant properties and the color of CME.
authors.affiliation: Team for Radiation Food Science & Biotechnology, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, Republic of Korea.
authors.forename: Jae-Hun
authors.initials: JH
authors.lastname: Kim
authors.forename: Nak-Yun
authors.initials: NY
authors.lastname: Sung
authors.forename: Sun-Kyu
authors.initials: SK
authors.lastname: Kwon
authors.forename: Periasamy
authors.initials: P
authors.lastname: Srinivasan
authors.forename: Beom-Seok
authors.initials: BS
authors.lastname: Song
authors.forename: Jong-Il
authors.initials: JI
authors.lastname: Choi
authors.forename: Yohan
authors.initials: Y
authors.lastname: Yoon
authors.forename: Jin Kyu
authors.initials: JK
authors.lastname: Kim
authors.forename: Myung-Woo
authors.initials: MW
authors.lastname: Byun
authors.forename: Mee-Ree
authors.initials: MR
authors.lastname: Kim
authors.forename: Ju-Woon
authors.initials: JW
authors.lastname: Lee
mesh_terms: D000363:Agaricales / Q000737:chemistry* / Q000528:radiation effects*; D000975:Antioxidants / Q000737:chemistry*; D005720:Gamma Rays; D017665:Hydroxyl Radical / Q000737:chemistry; D015227:Lipid Peroxidation; D010858:Pigmentation / Q000528:radiation effects*
chemical_list: D000975:Antioxidants; D017665:Hydroxyl Radical