Related Experiment Videos
Antioxidative activities of oolong tea.
Qin Yan Zhu1, Robert M Hackman, Jodi L Ensunsa
1Departments of Nutrition and Internal Medicine, University of California, Davis, California 95616-8669, USA.
Journal of Agricultural and Food Chemistry
|October 31, 2002
Summary
Oolong tea extract (OTE) demonstrates significant antioxidant activity across various tests. Lower molecular weight fractions, rich in phenolic compounds, exhibit the strongest antioxidant effects, suggesting health benefits.
Area of Science:
- Food Science
- Biochemistry
- Nutraceuticals
Background:
- Green and black teas are well-researched for antioxidants, but oolong tea's properties are less understood.
- Antioxidants play a crucial role in health by combating oxidative stress.
Purpose of the Study:
- To evaluate the antioxidative properties of oolong tea water extract (OTE).
- To investigate the relationship between molecular weight, phenolic content, and antioxidant activity in OTE.
Main Methods:
- Assessing reducing power and DPPH radical scavenging activity of OTE.
- Quantifying total phenolic compounds and evaluating inhibition of DNA damage and erythrocyte hemolysis.
- Fractionating OTE by molecular weight to analyze antioxidant capacity.
Main Results:
- OTE exhibited strong antioxidant activities in all tested model systems.
- Fractions with higher phenolic content (lower molecular weight) showed enhanced antioxidant effects.
- A clear correlation exists between lower molecular weight phenolic compounds and potent antioxidant activity.
Conclusions:
- Oolong tea contains potent low molecular weight antioxidants.
- These antioxidants in oolong tea may contribute to health promotion.
- Further research into oolong tea's bioactive compounds is warranted.