Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Antioxidaive Activity of Lotus Root(Nelumbo nucifera G.) Extracts.

연근 추출물의 항산화 효과

  • 이재준 (조선대학교 식품영양학과) ;
  • 하진옥 (조선대학교 식품영양학과) ;
  • 이명렬 (조선대학교 식품영양학과)
  • Published : 2007.09.30
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Abstract

This study was investigated on the antioxidant capacity of 80% ethanol extract of lotus root in vitro. The ex-traction yields of 80 % ethanol extract was 9.14%. Lotus root ethanol extract was fractionated by the following: n-hexane, chloroform, ethylacetate and n-butanol. n-Butanol fraction showed the highest ex-traction yield of all fractions. Antioxidative activities of different fractions were examined by l.l-diphenyl-2-picrylhydrazyl(DPPH) radical generation, the Rancimat test, the nitrite scavenging ac-tivity and the thiobarbituric acid(TBA) method, and compared with the properties of the commercial antioxidant butylated hydroxytoluene(BHT). The antioxidative capacity of the ethylacetate fraction was the highest among fractions and its fraction showed higher contents of total polyphenol. Furthermore, the antioxidative capacity of the ethylacetate fraction was similar to that of BHT. In conclusion, these results suggest that lotus root may be a good candidate as a natural antioxidant source.

본 연구에서는 연근의 유용자원으로의 이용 가능성을 알아보기 위하여, 연근 추출물을 제조하여 in vitro 에서 합성항산화제로 널리 알려진 BHT와의 비교 측정하기 위하여 연근 에탄올 추출물의 각 분획별 항산화력 활성을 검토하였다. 연근 분획물의 항산화성을 알아보기 위하여 DPPH radical에 대한 자유기 소거능, Rancimat에 의한 항산화지수, 아질산염 소거능, 지질과산화물 생성 억제효과 등을 측정하였고, 총 polyphenol 함량을 측정하였다. 그 결과 연근 에탄올 추출물의 수율은 9.14% 이었고, 연근 에탄올 추출물의 계통 분획한 수율은 n-butanol이 가장 높았으며, 다음으로는 water, eth-ylacetate, chloroform, n-hexane 순이었다. 연근 에탄올 추출물의 총 polyphenol 함량은 0.306 mg/ml이었고, 각 분획물 중 ethylacetate 분획물이 0.843 mg/ml로 가장 많이 함유된 것으로 나타났다. DPPH radical에 대한 소거능을 측정한 결과 ethylacetate 분획물이 15.69 ${\mu}g/ ml$로 가장 강한 소거능을 나타내었으며, 합성항산화제 BHT의 15.38 ${\mu}g$/ml 와 유사한 효과를 나타내었다. Rancimat의 지질 산패도 유도기간에 따른 항산화력 비교에서도, ethylacetate 분획물이 가장 길었으나 양성대조군인 BHT의 유도기간에 비하여 짧게 나타났다. 아질산염 소거능은 pH 1.2에서 가장 우수하였으며, pH 1.2에서 ethylacetate 분획물이 88.33%로 합성항산화제인 BHT와 비슷한 아질산염 소거능을 나타내었다. 지질과산화물 생성 억제효과도 ethylacetate 분획물이 87.23%로 가장 우수하였다. 전체적으로 연근 ethylacetate 분획물은 BHT와 유사한 항산화 활성을 나타내었다. 연근 추출물은 in vitro 항산화 실험에서 항산화 활성을 나타내는 생리활성 성분이 존재하는 것으로 볼 수 있으므로 천연 항산화제로서의 가능성을 시사하였다.

Keywords

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