Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Antioxidant and anti-inflammatory activities of water extracts and ethanol extracts from Portulaca oleracea L.

쇠비름 물, 에탄올 추출물의 항산화 및 항염증 활성

  • Received : 2017.12.06
  • Accepted : 2018.02.20
  • Published : 2018.02.28
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Abstract

Portulaca oleracea L., a species of Portulacaceae, is ubiquitous. It is a well-known traditional Chinese medicine for removing heat, counteracting toxicity, cooling blood, and maintaining hemostasia; it is also used as antidysentery agent. This study investigated the anti-oxidative and anti-inflammatory activities of water and ethanol extracts from P. oleracea. The total polyphenol content ($21.08{\pm}0.03mg\;GAE/g$) and total flavonoid content ($5.45{\pm}0.76mg\;QE/g$) of the ethanolic extracts were higher than those of the water extracts. The antioxidative activities were determined by evaluating the 1,1-diphenyl-2-picrylhydrazyl (DPPH) and the 2,2'-azinobis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) radical scavenging activity and by the ferric reducing antioxidant potential (FRAP) assay. The ABTS radical scavenging activity of the water extract (75.53%) was higher in those of the water extract (67.03%) at concentration of $1,000{\mu}g/mL$. The DPPH radical scavenging activity and FRAP of the ethanol extract were higher than those of the water extract. We also investigated the anti-inflammatory activity of the P. oleracea extracts in LPS-stimulated Raw 264.7 cells. The production levels of nitric oxide (NO) and reactive oxygen species (ROS) significantly decreased with an increasing concentration of the extract. The expression levels of pro-inflammatory cytokines (tumor necrosis faction (TNF)-${\alpha}$, interleukin (IL)-$1{\beta}$, and IL-6) were significantly lower in the ethanol extract than in the LPS alone treatment group. Based on these results, ethanolic extract from P. oleracea could be an effective antioxidant and anti-inflammatory agent.

본 연구에서는 쇠비름의 활용가치를 높이고 기능성 소재로서의 이용 가능성을 타진하기 위해 쇠비름 물 및 에탄올 추출물의 항산화와 항염증 활성을 탐색하였다. DPPH 라디칼 소거능과 FRAP을 이용한 총 항산화 효능 평가 결과 에탄올 추출물이 물 추출물보다 항산화 활성이 우수한 것을 확인하였고, ABTS 라디칼 소거능은 $1,000{\mu}g/mL$의 농도에서만 쇠비름 물 추출물의 활성이 더 높았다. 한편, 세포독성을 살펴보기 위하여 쇠비름 물 및 에탄올 추출물을 이용해 대식세포에 MTT assay를 수행한 결과, $4,000{\mu}g/mL$의 이하 농도까지는 세포의 생존율에 영향을 미치지 않는 것을 확인하였다. $1.0{\mu}g/mL$ LPS로 염증반응을 유도시킨 세포에 대해 쇠비름 물 추출물에 비해 에탄올 추출물이 더 효과적으로 농도의존적인 NO와 ROS 생성 억제 효과가 있었다. 추가적으로 세포의 항염증 효능의 지표 단백질로 알려진 TNF-${\alpha}$, IL-$1{\beta}$, IL-6의 발현을 확인하였을 때 LPS 단독 처리군 대비 쇠비름 에탄올 추출물에서 3가지 단백질 모두의 발현양이 감소하는 것을 확인하였다. 이상의 결과를 종합하여 볼 때 쇠비름 에탄올 추출물은 물 추출물에 비해 높은 항산화와 항염증 활성을 가지는 것으로 확인되었으며, 추후 쇠비름의 유효성분 추출을 통한 항염증 물질의 연구와 염증 억제 성분의 분리 및 그 작용기전 연구에 기초 자료가 될 것으로 사료된다.

Keywords

References

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