Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Total Phenols, Flavonoid Contents, and Antioxidant Activity of Spirodela polyrhiza Extracts

부평초 추출물의 페놀 및 플라보노이드 함량 분석 및 항산화 활성

  • Song, Won-Yeong (Department of Food Nutrition, International University of Korea) ;
  • Choi, Jeong-Hwa (Department of Food Nutrition, International University of Korea)
  • 송원영 (한국국제대학교 식품영양학과) ;
  • 최정화 (한국국제대학교 식품영양학과)
  • Received : 2016.09.26
  • Accepted : 2016.11.16
  • Published : 2017.02.28
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Abstract

We investigated the antioxidant activities of water and ethanol extracts from Spirodela polyrhiza (SP) through in vitro assays. The total phenolic contents of SP water and ethanol extracts were 52.75-293.4 and 60.12-398.4 mg/g, respectively. The total flavonoid content of SP ethanol extract (38.25-159.4 mg/g) was higher than that of SP water extract (38.25-67.75 mg/g). The water and ethanol extracts from SP scavenged the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and 2,2'-azino-di-2-ethyl-benzothia-zoline sulfonate (ABTS) radical in a dose-dependent manner in the concentration range of $100-2,500{\mu}g/ml$. The DPPH radical scavenging activity of the SP ethanol extract (2.87%-59.5%) was higher than that of the water extract (4.12%-81.52%). The $IC_{50}s$ of the DPPH radical scavenging activity of water and ethanol extracts were 2,100 and $1,034{\mu}g/ml$ respectively. The ABTS radical scavenging activities of SP water and ethanol extracts were 8.30%-83.16% and 13.11%-8.34% respectively. The $IC_{50}s$ of the ABTS radical scavenging activity of SP water and ethanol extracts were 798.7 and $457.1{\mu}g/ml$, respectively. The reducing power activities of SP water and ethanol extracts were 0.055-1.122 and 0.140-1.428, respectively ($500-4,000{\mu}g/ml$). The soybean lipoxygenase (SLO) radical scavenging activities of SP water and ethanol extracts were 157.7%-168.0% and 148.0%-169.4%, respectively. These results suggest that the water and ethanol extracts of SP may be useful as a potential antioxidant.

본 연구에서는 부평초의 열수추출물과 에탄올추출물간의 항산화 효과를 비교하기 위해 $100{\sim}2,500{\mu}g/ml$의 부평초의 농도를 이용하여 in vitro 실험으로 관찰하였다. 먼저 부평초 추출물을 농도별로 총 페놀 함량을 측정한 결과, 열수추출물에서 52.75~293.4 mg/g 그리고 에탄올추출물에서 60.12~398.4 mg/g의 함량이 관찰되었고, 플라보노이드 함량에서는 열수추출물(38.25~67.75 mg/g)에 비해 에탄올추출물(38.25~159.4 mg/g)에서 유의적으로 높게 나타났다. DPPH radical 소거능은 열수추출물(2.87~59.5%)과 에탄올추출물(4.12~81.52%)으로 농도 의존적으로 높은 활성을 나타내었고, 에탄올추출물은 열수추출물에 비해 유의적으로 더 높은 소거능이 관찰되어졌다. ABTS radical 소거능을 비교한 결과는 열수추출물에서 8.30~83.16%, 에탄올추출물에서 13.11~80.34%로 농도 의존적인 높은 소거 활성을 나타내었다. 부평초 추출물의 $IC_{50}$값을 비교한 결과 DPPH, ABTS radical에서 각각 열수추출물의 경우, $2,100{\mu}g/ml$, $798.7{\mu}g/ml$으로 나타났고, 에탄올추출물의 경우에는 $1,034{\mu}g/ml$, $457.1{\mu}g/ml$으로 나타났다. 환원력은 $500{\sim}4,000{\mu}g/ml$의 농도에서 관찰되어 졌는데, 열수추출물에서 0.055~1.122, 에탄올 추출물에서 0.140~1.428로 농도가 증가될수록 높은 활성을 보였으며, 에탄올추출물이 열수추출물에 비해 유의적으로 더 높은 환원력을 나타내었다. 또한 항염증 효능을 관찰하기 위한 SLO를 측정한 결과는 열수추출물에서 157.7~168.0% 그리고 에탄올추출물에서 148.0~169.4%의 감소율을 나타내었다. 이러한 결과로 미루어 부평초의 용매에 따른 추출물은 항산화 효과에 뛰어난 활성을 나타낼 뿐만 아니라, 항염증에도 관여할 수 있음이 사료되어지며, 항산화 효능에 대한 천연식물소재로서의 이용가치가 기대되어진다.

Keywords

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