Journal of Applied Biological Chemistry

The Korean Society for Applied Biological Chemistry (한국응용생명화학회)
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In vitro antioxidant activity of black tea (Camellia sinensis L.) residue extract

홍차박 추출물의 in vitro 항산화 활성

  • Received : 2019.07.31
  • Accepted : 2019.08.26
  • Published : 2019.09.30
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Abstract

A black tea (Camellia sinensis L.) residue extract (BTRE) was prepared by 30% ethanol extraction to evaluate its in vitro antioxidant activity. The yield and polyphenol content of BTRE were $22.4{\pm}1.18%$ and $23.2{\pm}1.02{\mu}g$ gallic acid equivalents/mg-extract, respectively. Antioxidant activity of BTRE proportionally increased as BTRE concentration increased. $IC_{50}$ values of BTRE for cation radical, free radical and nitrite scavenging were 141.8, 108.1, and $397.2{\mu}g/mL$, respectively. Also $IC_{50}$ value of BTRE for ferric reducing anti-oxidant power was $97.8{\mu}g/mL$. BTRE effectively inhibited linoleic acid peroxidation. These results imply that BTRE possessed potent antioxidant activity, thus being utilized as a physiologically active material.

홍차를 우려내고 남은 부산물인 홍차박을 30% 에탄올로 추출하여 수율, 폴리페놀 함량 및 항산화 활성을 확인하였다. 홍차박의 추출 수율은 $22.4{\pm}1.18%$이었고, 폴리페놀은 추출물에 $23.2{\pm}1.02{\mu}g\;GAE/mg$ 들어있었다. 홍차박 추출물은 양이온라디칼, 유리라디칼 및 아질산염을 농도에 비례하여 소거하였고, 환원력과 지질과산화 억제활성도 농도의존적으로 증가하였다. 홍차박 추출물의 ABTS 양이온라디칼, DPPH 유리라디칼 및 아질산염 소거에 대한 $IC_{50}$값은 각각 141.8, 108.1 및 $397.2{\mu}g/m$이었고, 환원력에 대한 $IC_{50}$값은 $97.8{\mu}g/mL$로 나타났다. 또한 홍차박 추출물은 linoleic acid의 과산화를 효과적으로 억제하였다. 결론적으로 홍차박 추출물은 우수한 항산화 활성을 보유하고 있어 생리활성 소재로의 활용 가능성을 보여주었다.

Keywords

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