Antioxidant Activity of Hot-Water Extract from Yuza (Citrus junos SIEB ex TANAKA) Peel

This study was to investigate of characteristics and antioxidant function of yuza from 4 different area. The hot-water extracts of yuza peel extracts from Geoje, Goseong, Goheung and Namhae(Changseon, Seolcheon) were tested for antioxidant activity in different reaction systems. Contents of total phenolic compounds and flavonoids were mg/100 g and mg/100 g in hot water extracts from Namhae-Seolcheon, respectively. The highest contents of hesperidin and naringin were mg/100 g and mg/100 g in hot water extracts from Geoje, respectively. Antioxidant activity of yuza peel hot-water extracts were significantely increased as the increament of sample adding concentration (/ml). Reducing power was folds higher in 10,000 /ml concentration than 500 /ml and it`s O.D. value showed . ABTs scavenging activity was more than 80% in 10,000 /ml concentration samples, except from Goseong (). Hydroxyl radical scavenging activity was higher in Namhae-Seolcheon () and Namhae-Changseon () at 10,000 / ml concentration, others activity were below 30%. At 10,000 /ml concentration, NO radical scavenging activity and antioxidant activity in -carotene linoleic acid system were and , respectively.