Antioxidant Properties of Tea

Green tea provides a wealth of simple phenolics; black tea provides more complex polyphenols. There is some controversy about which group has higher antioxidant potential in vivo.

An Italian study found that while green tea was six times more potent in inhibiting lipid peroxidation in vitro, when healthy human subjects ingested the same amount of either black or green tea, the plasma antioxidant capacity (expressed as TRAP, or total radical-trapping antioxidant parameter) was similar in both groups.

The increase in plasma antioxidant capacity was quite rapid, peaking at 30-50 minutes. This indicates that the most bioactive antioxidant compounds are quickly absorbed in the upper part of the gastrointestinal system.
While an Italian study once found that adding milk to tea eliminated its antioxidant effect in vivo other studies have contradicted this result, finding that the addition of milk does not affect antioxidant activity

One study found green tea polyphenols to be comparable to BHT (a well-known synthetic phenolic antioxidant) in antioxidant power when it came to protecting canola oil; green tea outperformed BHT when the oil was heated.
The active ingredient in green tea, catechin, has also been found to outperform Vitamin C and beta-carotene ten times in scavenging the alkyl peroxyl radical. One study found green tea polyphenols to be more potent antioxidants than Vitamin C, Vitamin E, rosemary extract, and even curcumin in some systems.

According to the U.S. National Cancer Institute, in laboratory studies using animals, catechins scavenged oxidants before cell damage occurred, reduced the number and size of tumors, and inhibited the growth of cancer cells. White tea is said to be even more effective. However, human studies have proven more contradictory, perhaps due to such factors as variances in diet, environments, and populations.

Green tea is very important for human body. The allowances acquired from blooming tea are believed to be abundantly due to the polycatechins that are present in it. Green tea is very popular in Japan, India.

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