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Antioxidative Activity of Methanolic Extracts from Seaweeds

해조류 메탄올 추출물의 항산화효과

  • Kim, Byoung-Mok (Faculty of Marine Bioscience & Technology, Kangnung National University) ;
  • Jun, Joon-Young (Faculty of Marine Bioscience & Technology, Kangnung National University) ;
  • Park, Yeung-Beom (Dept. of Food Processing & Bakery, Gangwon Provincial College) ;
  • Jeong, In-Hak (Faculty of Marine Bioscience & Technology, Kangnung National University)
  • 김병목 (강릉대학교 해양생명공학부) ;
  • 전준영 (강릉대학교 해양생명공학부) ;
  • 박영범 (강원도립대학 식품가공제과제빵과) ;
  • 정인학 (강릉대학교 해양생명공학부)
  • Published : 2006.08.30

Abstract

In this study, seven species of seaweeds (Sargassum horneri, Grateloupia filicina, Kjellmaniella crassifolia, Porphyra tenera, Ecklonia stolonifera, Scytosiphon lomentaria, Agarum cribrosum) from Gangwon coast were collected for antioxidative assays. The methanol soluble and insoluble (water soluble) fraction which were prepared from 75% methanol extraction were assayed by DPPH method and deoxyribose assay. The antioxidative activity of methanol soluble fraction of Agarum, Scytosiphon and Sargassum reached to 26.60%, 24.28% and 23.40%, respectively. The antioxidative activities of methanol insoluble fractions of the Kjellmaniella and Porphyra were assayed to 29.70% and 21.01% which were higher than methanol soluble fractions with the values of 9.26% and 8.66%, respectively. The results from DPPH assay and deoxyribose assay showed the methanol soluble fractions of Agarum and Sargassum have strong antioxidative activity. However the methanol insoluble (water soluble) fractions of seaweeds did not show any meaningful antioxidant activity excepted Kjellmaniella and Porphyra.

본 실험에는 강원도의 대표적인 갈조류로 재래종다시마, 괭생이모자반, 그리고 수심이 비교적 깊은 곳에 식생하는 곰피와 구멍쇠미역, 녹조에 속하는 고리매, 우리나라 국민이 가장 많이 소비하고 있는 해조이면서 홍조류에 속하는 김과 동해안 특산 홍조류이며 지역민들이 즐겨 먹고 있는 지누아리의 해조 7종이 사용되었다. 이 7종의 해조로부터 75% 메탄올로 상온에서 추출하여 얻어진 추출물을 용매를 완전히 제거한 후 다시 메탄올에 용해하는 메탄올 가용성 분획(SF)과 메탄올에 녹지 않지만 물에 용해하는 극성이 강한 성질의 불용성 분획(ISF)으로 분리하여 각 분획의 함량을 측정하였으며 DPPH를 이용한 전자공여능과 hydroxy radical 소거능을 측정하여 항산화효과를 분석하였다. 메탄올 가용성 분획은 구멍쇠미역, 고리매, 괭생이모지반이 $26.60{\sim}23.40%$로 높았으며 재래종다시마와 김이 9.26%와 8.66%로 낮았다. 메탄올 불용성이며 수용성 분획은 재래종다시마와 김에서 29.70%와 21.01%로 가장 높았으며 그 외의 해조에서는 지누아리 8.76%, 곰피 6.46%, 고리매 4.87%, 구멍쇠미역 2.05%, 괭생이모자반 1.95%로 아주 낮았다. DPPH를 이용한 전자공여능 평가와 hydroxy radical 소거능 평가에서 메탄올 가용성 분획이 높은 해조, 즉 구멍쇠미역과 괭생이모자반에서 우수한 항산화효과를 보였으며 이와 같은 평가결과는 총페놀 함량이 높은 것과 잘 일치하였다. 갈조류인 곰피는 전자공여능은 우수한 것으로 평가되었으나 hydroxy radical 소거능은 나타나지 않았다. 메탄올 추출물에서 재용해하지 않는 메탄올 불용성 분획은 실험에 사용된 7종의 해조 모두에서 총페놀이 거의 없는 것으로 나타났으며 전자공여능과 hydroxy radical 소거능 평가에서 효과를 전혀 보이지 않았다. 이상의 결과로부터 해조의 항산화효과는 메탄올에 용해하는 성분이 강한 항산화효과를 지니는 것으로 나타났으며 이 효과는 페놀 화합물과 관련이 깊은 것으로 사료된다.

Keywords

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