Korean Journal of Medicinal Crop Science (한국약용작물학회지)

The Korean Society of Medicinal Crop Science (한국약용작물학회)
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Protective Effect of Green Tea Extracts on Oxidative Stress

녹차추출물의 산화적 스트레스에 대한 억제효과

  • Kim, Nam-Yee (College of Pharmacy, Kangwon National University) ;
  • Lee, Jin-Ha (School of Biotechnology and Bioengineering, Kangwon National University) ;
  • Heo, Moon-Yaung (College of Pharmacy, Kangwon National University)
  • 김남이 (강원대학교 약학대학) ;
  • 이진하 (강원대학교 바이오산업공학부) ;
  • 허문영 (강원대학교 약학대학)
  • Published : 2006.12.30
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Abstract

Green tea is of particular source as it has been found to have strong antioxidant activities. The extracts of green tea during the commercial harvest seasons from April, 2003 to August, 2003 were compared. The purpose of this study was to determine the correlation between the polyphenol content of green teas and its antioxidant activities. The con-tent of total polyphenols was analyzed and several antioxidant testings were performed. The levels of total polyphenols were higher in the green teas (e.g. Woojeon, Sejak) harvested during very early spring and lower in the green teas harvested late(eg. Ipha, Yepcha). In particular, the free radical scavenging, the inhibition of LDL oxidation, the cytoprotective effect and the inhibition of DNA damage were correlated with the total polyphenol contents of green tea extracts harvested early spring such as Woojeon, Sejak and Jungjak. The results obtained here show that all extracts of green teas including purified green tea catechin, GTC, have strong antioxidant activities on oxidative stress in vifrθ. The variation in polyphenol content and antioxidant activities among various types of green tea by the harvesting time may provide critical information for investigators and consumers using tea in purposes of nutrition and chemoprevention.

Keywords

References

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