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KMID : 1011620100260010088
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Korean Journal of Food and Cookey Science
2010 Volume.26 No. 1 p.88 ~ p.94
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Antioxidative Activities of Dried and Fresh Citrus Peels in Jeju
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현재석:Hyon Jae-Seok
강성명:Kang Sung-Myung/마힌다:Mahinda Senevirathne/고원준:Koh Won-Joon/양태석:Yang Tai-Suk/오명철:Oh Myung-Cheol/오창경:Oh Chang-Kyung/전유진:Jeon You-Jin/김수현:Kim Soo-Hyun
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Abstract
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This study was carried out to investigate the total polyphenol and flavonoid contents and antioxidative activities of the methanol extracts of Citrus sunki, C. unshiu and C. natsudaidai peels before and after drying. Total polyphenolic content was high in the citrus peels before drying compared to the dried peels, and highest in the order of C. sunki, C. natsudaidai and C. unchiu. On the other hand, flavonoid content was high in the dried citrus peels than in the citrus peels before drying, and was highest in the order of C. unshiu, C. natsudaidai, C. sunki, but in dried peels it was highest in the order of C. natsudaidai, C. unshiu, C. sunki. DPPH radical scavenging activity was highest in the order of C. natsudaidai, C. unchiu, C. sunki, and that in the citrus peels before drying was higher than in the dried peels. Inparticular, C. natsudaidai peels before drying showed higher activity than vitamin C in 0.5 or 1.0 ㎎/100 g. Hydrogen peroxide scavenging activity was highest in the order of C. unshiu, C. natsudaidai, and C. sunki in the citrus peels before drying. The dried peels were highest in the order of C. unshiu, C. natsudaidai, C. sunki at 0.5 ㎎/100 g, but high in order of C. natsudaidai, C. unshiu and C. sunki at more than 1.0 ㎎/100 g. Inparticular, all C. natsudaidai peels displayed high activity more than 87% at 2.0 ㎎/100 g. Clear patterns in alkyl radical scavenging activity could not be confirmed in Citrus species whether before or after drying of peels. Hydroxyl radical scavenging activity was highest in the order of C. natsudaidai, C. unshiu and C. sunki but was relatively low compared to the scavenging activity of other activated oxygen species.
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KEYWORD
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Citrus sunki, Citrus unshiu, Citrus natsudaidai, fresh and dried peels, antioxidative activity
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