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Antioxidant Compounds and Antioxidant Activities of the 70% Ethanol Extracts from Brown and Milled Rice by Cultivar

벼 품종별 현미와 백미 70% 에탄올 추출물의 항산화 성분 및 항산화 효과

  • Kim, Dae-Jung (National Institute of Crop Science, Rural Development Administration) ;
  • Oh, Sea-Kwan (National Institute of Crop Science, Rural Development Administration) ;
  • Yoon, Mi-Ra (National Institute of Crop Science, Rural Development Administration) ;
  • Chun, A-Reum (National Institute of Crop Science, Rural Development Administration) ;
  • Hong, Ha-Cheol (National Institute of Crop Science, Rural Development Administration) ;
  • Lee, Jun-Soo (Dept. of Food Science and Technology, Chungbuk National University) ;
  • Kim, Yeon-Kyu (National Institute of Crop Science, Rural Development Administration)
  • 김대중 (농촌진흥청 국립식량과학원 답작과) ;
  • 오세관 (농촌진흥청 국립식량과학원 답작과) ;
  • 윤미라 (농촌진흥청 국립식량과학원 답작과) ;
  • 천아름 (농촌진흥청 국립식량과학원 답작과) ;
  • 홍하철 (농촌진흥청 국립식량과학원 답작과) ;
  • 이준수 (충북대학교 식품공학과) ;
  • 김연규 (농촌진흥청 국립식량과학원 답작과)
  • Published : 2010.03.31

Abstract

The objectives of this study were to determine various bio-active components from some brown rice and milled rice of some cultivars, as well as to assess their contribution to the radical scavenging linked-antioxidant activity. DPPH or ABTS radical scavenging activities, and reducing power have been used to investigate the relative antioxidant activities of 70% ethanol extracts. The contents of total polyphenol, total flavonoid, $\gamma$-oryzanol, and vitamin E in the extracts were also measured by spectrophotometric methods or HPLC. The antioxidant components and antioxidant activities of 70% ethanol extracts from brown rice were higher than those from milled rice. In addition, our results showed that the high level of antioxidant compounds was found in brown rice of Hongjinju, and the antioxidant activities of the 70% ethanol extracts from pigmented brown rices, such as Hongjinju and Heugkwang, were comparably higher than the others.

본 연구에서는 여러 가지 벼 품종(삼광벼, 설갱벼, 큰눈벼, 화선찰벼, 홍진주벼, 흑광벼, 일품벼, 하이아미 및 녹미)의 현미와 백미 70% 에탄올 추출물의 항산화 성분과 항산화활성을 비교.분석하여 쌀의 기능적 가치를 평가함으로써 이용 가능성을 살펴보고자 하였다. 주요 품종별 현미와 백미의 항산화 성분으로는 polyphenol, flavonoid, tocopherol, tocotrienol 및 $\gamma$-oryzanol을 측정하였으며, 항산화력은 ABTS와 DPPH radical 제거능 및 환원력을 측정하였다. 각 품종의 현미와 백미의 70% 에탄올 추출물에서 1.98~3.80%와 0.44~1.28%의 추출 수율을 보였으며, 실험결과 현미 추출물에서 백미 추출물보다 높은 함량의 항산화 성분 및 항산화 활성을 나타내었다. 또한 각 품종의 현미와 백미 중에서 항산화 성분 및 항산화 활성이 높은 품종으로는 유색미인 홍진주벼로 나타났다. 홍진주벼와 더불어 흑광벼에서도 상당한 항산화 성분을 함유하고 있었으며, 그에 따른 우수한 항산화 활성을 나타내는 것을 알 수 있었다. 이상의 결과에서 쌀의 항산화 성분과 항산화 활성 연구에 있어 $\gamma$-oryzanol, polyphenol 등과 같이 항산화 활성을 보이는 성분들은 백미 추출물보다는 현미 추출물에서 다량 포함되어 있었으며 일반벼보다는 유색미에서 다량 함유되어 있음을 알 수 있었다. 이러한 결과는 쌀 기능성 구명연구를 위한 기초 자료를 제공하고, 금후 건강증진 식품으로서 쌀의 효능을 소비자들에게 인식시켜 나아가 쌀 소비 촉진에 기여할 것으로 기대된다.

Keywords

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