Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Antioxidant and nitric oxide inhibition effect of domestic and foreign fermented black tea extracts

국내외 홍차 추출물의 항산화 효과 및 Nitric Oxide 생성 저해 효과

  • Moon, Gyo-Ha (Department of Food Science and Technology, Seoul National University of Science & Technology) ;
  • Kim, Gyeong-Ji (Department of Biomedical Engineering, Sogang University) ;
  • Lee, Yu-Rim (Department of Food Science and Technology, Seoul National University of Science & Technology) ;
  • Kim, Jong Cheol (Institute of Hadong Green Tea) ;
  • Shim, Doobo (Institute of Hadong Green Tea) ;
  • Chung, Kang-Hyun (Department of Food Science and Technology, Seoul National University of Science & Technology) ;
  • Lee, Kwon-Jai (Department of H-Lac, Daejeon University) ;
  • An, Jeung Hee (Department of Food Science and Nutrition, KC University)
  • 문교하 (서울과학기술대학교 식품공학과) ;
  • 김경지 (서강대학교 융합의생명공학과) ;
  • 이유림 (서울과학기술대학교 식품공학과) ;
  • 김종철 ((재)하동녹차연구소) ;
  • 심두보 ((재)하동녹차연구소) ;
  • 정강현 (서울과학기술대학교 식품공학과) ;
  • 이권재 (대전대학교 신소재공학) ;
  • 안정희 (KC 대학교 식품영양학과)
  • Received : 2021.05.28
  • Accepted : 2021.07.01
  • Published : 2021.08.31
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Abstract

This study investigated the antioxidant and nitric oxide (NO) inhibition effects of three domestic and seven foreign fermented black tea 70% ethanol extracts. Bosung showed the highest total polyphenol and tannin contents. Jeju showed the highest total flavonoid contents. The theanine content was higher in Hadong (651.50 mg%) than in foreign fermented black tea. At 25 ㎍/mL, the domestic fermented black tea extract showed the highest DPPH and ABTS racial-scavenging activities, reducing power assays. Domestic fermented black tea showed higher NO inhibitor activity than foreign black tea at 50 ㎍/mL. Bosung black tea extract showed an increase in SOD-1 level (1.39-fold) compared to the LPS-only group. Bosung and Jeju decreased the GST protein by 1.52- and 1.46-folds, respectively, compared to the LPS-only group. Thus our results suggest that domestic fermented black tea (Bosung, Jeju, and Hadong) are effective antioxidants in RAW 264.7 cells.

본 연구에서는 국내산 홍차 3종과 외국산 홍차 7종의 70% 에탄올 추출물의 항산화 효과와 LPS로 유도된 대식세포에서의 항염증 보호 효과를 평가하였다. 국내산 홍차인 보성에서 총 폴리페놀(330.13 mg GAE/g)과 탄닌(285.65 mg TAE/g)의 함량을 보였고, 총 플라보노이드 함량은 제주(590.11 mg CE/g)가 외국산 홍차와 유사하게 높은 함량을 보였다. 테아닌 함량은 국내산 홍차인 하동(651.50 mg%)이 외국산 홍차보다 매우 높은 함량을 나타냈다. 또한, DPPH 라디칼 소거능 활성과 환원력은 25 ㎍/mL 농도에서 보성 홍차에서 높은 활성을 보였다. 25 ㎍/mL 농도에서 ABTS 라디칼 소거능 활성은 제주(63.89%), 보성(59.73%)과 하동(52.76%)에서 높은 라디칼 소거능을 나타냈다. 대식세포에서의 세포보호 효과는 50-100 ㎍/mL 농도의 모든 홍차 추출물에서 높은 세포 생존율을 보였고 200 ㎍/mL 농도에서는 보성이 98.22%로 가장 높은 세포 보호 효과를 보여주었다. 세포 내 NO 생성 억제 활성은 국내산 하동, 제주와 보성 홍차의 모든 농도에서 외국산보다 높은 NO 생성 저해능을 보였다. LPS에 의해 염증이 유발된 대식세포에서의 항산화 효과를 확인하여 50 ㎍/mL의 보성홍차 추출물에서 SOD-1 발현이 LPS 단독 처리군에 비해 1.39배 증가하였다. 또한, GST발현은 LPS 단독 처리군에 비해 보성과 제주 홍차 추출물에서 각각 1.52배와 1.46배 증가되었다. 본 연구에서는 국내산 홍차와 외국산 홍차를 비교 평가한 결과 보성과 제주 홍차 추출물의 항산화 단백질 발현은 폴리페놀이나 플라보노이드 성분과 밀접하게 관여한 것으로 보이며 하동 홍차의 NO 생성 억제 활성은 높은 테아닌 함량에 의한 것으로 판단된다. 본 연구에서 국내산 홍차 추출물인 보성, 제주와 하동 홍차가 항산화 및 항염증 활성이 있는 것으로 보이며 이는 기능성 소재로서의 개발의 가능성이 있다고 보인다.

Keywords

Acknowledgement

본 결과물은 농림축산식품부의 재원으로 농림식품기술기획평가원의 농생명산업기술개발사업의 지원을 받아 연구되었음(과제번호: 319104-04-1-HD030)

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