Food Science and Preservation (한국식품저장유통학회지)

The Korean Society of Food Preservation (한국식품저장유통학회)
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Antioxidant and anti-inflammatory activities of extracts from Ledum palustre L.

백산차 추출물의 항산화 및 항염증 활성

  • Kim, Se Gie (Department of Pharmaceutical Science and Technology, Daegu Catholic University)
  • 김세기 (대구가톨릭대학교 제약산업공학전공)
  • Received : 2017.11.10
  • Accepted : 2017.11.20
  • Published : 2017.11.30
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Abstract

In this study, Ledum palustre L. was extracted by 4 different methods (LPW, hot water extraction; LPA, autoclave extraction; LPU, ultrasonification extraction; LPE, 70% ethanol extraction) and LPE was fractionated by using polarity difference of each solvent and used as 4 samples (LPE/H, the n-hexane layer; LPE/E, the EtOAc layer; LPE/B, the n-BuOH layer; LPE/W, the $H_2O$ layer). Antioxidant activities of Ledum palustre L. extracts were measured by DPPH and ABTS. As a result, the DPPH and ABTS radical scavenging showed high activities with LPE (82.3%, 99.8%) and LPE/E (91.8%, 99.6%) at the concentration of $1,000{\mu}g/mL$. The anti-inflammatory activities of LPE and LPE/E were measured by the inhibitory activity against NO, $PGE_2$, TNF-${\alpha}$, IL-$1{\beta}$ and IL-6 production on LPS-stimulated Raw 264.7 macrophages. As a result of MTT assay, cell viabilities of LPE and LPE/E were more than 90% at $25{\mu}g/mL$. NO and $PGE_2$ productions were inhibited by LPE (NO: 50%, $PGE_2$: 70%) and LPE/E (NO: 57%, $PGE_2$: 73%) at the concentration of $25{\mu}g/mL$. The inhibition activities against TNF-${\alpha}$, IL-$1{\beta}$, IL-6 production were 24%, 47% and 40% at the concentration of $25{\mu}g/mL$ of LPE. In particular, LPE/E showed 51%, 57% and 62% inhibition activities at the same concentration, respectively. From the above results, it can be concluded that $1,000{\mu}g/mL$ of LPE and LPE/E have the high antioxidant activities similar with Vitamin C, and $25{\mu}g/mL$, the low concetration of LPE and LPE/E have excellent anti-inflammatory activities. Therefore, if more research about anti-aging, whitening and antimicrobial activity of Ledum palustre L. extracts is carried out in the future, it will be possible to use them as effective materials for the prevention and treatment of inflammatory diseases and in the areas of functional foods and cosmetics.

본 연구에서는 백산차추출물의 항산화 활성을 알아보기 위해 추출방법을 달리한 4가지 추출물인 열수추출물(LPW), 고온가압추출물(LPA), 초음파추출물(LPU), 70% 에탄올 추출물추출(LPE)과 LPE에 대한 4가지 용매 층 분획물인 n-hexane 층(LPE/H), ethyl acetate 층(LPE/E), n-butanol 층(LPE/B), water 층(LPE/W) 분획물의 DPPH와 ABTS 라디칼 소거 활성을 측정하였다. 또한 백산차 추출물의 항염활성을 알아보기 위해 LPS로 자극된 Raw 264.7 대식세포에서 LPE와 LPE/H, LPE/E, LPE/B, LPE/W의 NO, $PGE_2$, TNF-${\alpha}$, IL-$1{\beta}$, IL-6의 생성 저해 활성을 측정하였다. 그 결과, DPPH와 ABTS 라디칼 소거 활성에서 LPE가 $1,000{\mu}g/mL$의 농도에서 각각 82.3%와 99.8%의 소거 활성을 나타내었으며, LPE/E의 경우 $1,000{\mu}g/mL$의 농도에서 각각 91.8%와 99.6%의 높은 소거 활성을 나타내었다. 항염 활성 확인을 위하여 먼저 MTT assay를 수행하였으며 $25{\mu}g/mL$ 농도에서 LPE와 LPE/E 모두 90% 이상의 세포 생존율이 확인되었다. NO와 $PGE_2$의 생성 저해 활성을 분석한 결과, LPE와 LPE/E에서 높은 NO와 $PGE_2$ 저해 활성을 확인 하였다. LPE는 $25{\mu}g/mL$의 농도에서 각각 50%와 70%의 저해 활성을 나타내었고 LPE/E는 같은 농도에서 각각 57%와 73%의 저해 활성을 나타내었다. 마지막으로 TNF-${\alpha}$, IL-$1{\beta}$, IL-6의 생성 저해 활성을 측정한 결과 LPE 및 LPE/E의 농도의존적인 저해 활성을 확인 하였으며 LPE가 $25{\mu}g/mL$의 농도에서 각각 24%, 47%, 40%의 저해 활성을 나타내었다. 특히 LPE/E는 같은 농도에서 각각 51%, 57%, 62%의 높은 저해활성을 보였다. 이러한 결과들로부터 $1,000{\mu}g/mL$ 농도의 LPE 및 LPE/E는 비타민C와 유사한 DPPH 및 ABTS 라디칼 소거능을 가지며 비교적 낮은 농도인, $25{\mu}g/mL$ 농도에서도 높은 항염증 활성을 가지고 있는 것으로 결론을 내릴 수 있다. 따라서 추후 항노화, 항균, 미백 활성 등에 대한 더 많은 연구 진행이 이루어진다면 백산차추출물은 염증성 질환의 예방 및 치료와 기능성 식품, 화장품 분야 등에서 효과적인 소재로 활용될 수 있을 것으로 사료된다.

Keywords

References

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