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Antioxidative Activity of Germinated Specialty Rices  

Kang, Mi-Young (Department of Food Science and Nutrition, Kyungpook National University)
Kim, Sul-Yi (Department of Biological Science, Ajou University)
Koh, Hee-Jong (Department of Agronomy, Seoul National University)
Chin, Joong-Hyoun (Department of Agronomy, Seoul National University, Shinji Corp.)
Nam, Seok-Hyun (Department of Biological Science, Ajou University)
Publication Information
Korean Journal of Food Science and Technology / v.36, no.4, 2004 , pp. 624-630 More about this Journal
Abstract
Functionality changes by germination of giant embryonic rice and pigmented rice were evaluated with focusing on antioxidative activities of 70% ethanolic extracts. Overall, reducing power of giant embryonic rice and pigmented rice was higher than that of normal brown rice, and the germination of rices tend to enhance their reducing powers. In vitro and ex vivo experiments employing linoleic acid peroxidation and rabbit erythrocyte membrane peroxidation systems, respectively, revealed inhibitory effect on lipid peroxidation was highest in pigmented rice, followed by giant embryonic rice, and normal brown rice from high to low order. Superoxide radical-scavenging activity decreased in order of pigmented rice > giant embryonic rice > normal brown rice, and germination also enhanced their superoxide scavenging ability compared to non-germinated controls. Hydroxyl radical-scavenging ability was highest in pigmented rice, followed by giant embryonic rice, and normal brown rice. Despite marked enhancement in hydroxyl radical-scavenging ability of normal brown rice by germination, order of scavenging ability was not altered among germinated rices. Same trend as with in vitro ROS scavenging was observed for ex vivo scavenging potency on ROSs generated by TPA stimulation in HL-60 cells. Germination-associated differential increase in ROS scavenging ability of pigmented rice and giant embryonic rice, characterized by no induction of cytotoxicity, was observed.
Keywords
specialty rice; germination; antioxidation; reactive oxygen species; radical scavenging;
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