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Antioxidative activities of oolong tea.

Authors
  • Zhu, Qin Yan
  • Hackman, Robert M
  • Ensunsa, Jodi L
  • Holt, Roberta R
  • Keen, Carl L
Type
Published Article
Journal
Journal of agricultural and food chemistry
Publication Date
Nov 06, 2002
Volume
50
Issue
23
Pages
6929–6934
Identifiers
PMID: 12405799
Source
Medline
License
Unknown

Abstract

While the antioxidative properties of green and black tea have been extensively studied, less attention has been given to these properties in oolong tea. The reducing powers, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activities, the amount of total phenolic compounds, the inhibitory effect on FeCl(2)/H(2)O(2) (Fenton reaction system)-induced DNA damage, and the inhibitory effect on erythrocyte hemolysis of an oolong tea water extract (OTE) were evaluated in the present study. The OTE was found to have strong antioxidative activities in all of the model systems tested. When the OTE was separated into different fractions according to molecular weight, it was found that the fractions with higher amounts of phenolic compounds (lower molecular weight) have stronger antioxidative activities. The present results support the concept that oolong tea contains several low molecular weight antioxidants that may have health promotion activities.

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