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KMID : 0665220050180030219
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Korean Journal of Food and Nutrition
2005 Volume.18 No. 3 p.219 ~ p.224
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Antioxidative Effect on the Green Tea and Puer Tea Extracts
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Son Gyu-Mok
Chung Ji-Young
Shin Dong-Joo
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Abstract
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To see the antioxidative ability of puer tea against green tea, antioxidative effects of water and methanol extracts were compared and researched each. Water extracts from green tea and puer tea contain similar percentage of total polyphenol content while methanol extract from puer tea has about 58% of total polyphenol content of that from green tea. Water extracts from both teas contain similar percentage of the electron donating ability while methanol extract from puer tea has about 54% of the electron donating ability of that from green tea. Solvents made a big difference in SOD-like activities. The activations in water extracts were from 13.46% to 48.93%, which didn’’t give much difference between green tea and puer tea. However, the activations in methanol extracts were 59.63% in green tea and 48.93% in puer tea, which was 3~4 times higher than that in water extracts and green tea activated better. The nitrite scavenging activity was similar in water extracts from both teas and the methanol extract from puer tea had a bit higher nitrite scavenging activity than that from green tea. The ACE inhibitory activity in water extract from puer tea was about 38% higher than that from green tea while the activity of methanol extract from green tea was higher than that from puer tea. These results indicate that the antioxidative ability of water extract from puer tea is similar to that from green tea but the ACE inhibitory activity of puer tea reveals higher value and antioxidative ability of methanol extract from puer tea was lower than that from green tea while the nitrite scavenging activity of puer tea was higher.
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KEYWORD
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green tea, puer tea, antioxidative effect, nitrite scavenging activity, ACE inhibitory activity
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