
Sunday, December 26th, 2004
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Inactive Member
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Last Online: Sunday, October 28th, 2007 10:58
Join Date: Dec 2004
Location: Dingli, Malta
Age: 28
Posts: 236
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Green Tea
I am pasting hereunder the introduction of a document a friend of mine (studying medicine in the University of Malta) sent me about Green Tea and its very interesting properties. The document is very long so I will try to upload it instead of pasting it here.
Quote:
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The beverage of choice in the east, green tea shows promise as an anti-aging, cancer-fighting agent
Description / Source / Components
"Each year about 2.5 million tons of tea are manufactured from the dried leaves and leaf buds of the shrub Camellia sinensis. ... Green tea, which is not fermented, is made by steaming or pan-frying tea leaves and then drying them. It accounts for about 20% of world production and is mostly consumed in China and Japan, where it has been used medicinally as a stimulant and digestive remedy for about 5000 years." (Kaegi)
"Green tea is different from black tea in that it [green tea] is produced from leaves that have been withered, rolled, fermented, and dried. Because of the curing process, the properties of the green tea are very similar to that of the fresh leaf." (Fetrow)
"Black teas - the preferred drink in Europe and the Americas - are partially dried, crushed, allowed to "ferment" or oxidize in heat for a few hours, then fully dried. ... Green teas, the preferred drink in Asia, are not crushed and oxidized. Instead they are steamed, then rolled and dried. The steaming actually prevents oxidation by inactivating the enzymes in the leaves. Thus green and black teas have different chemical properties." (University)
"The growth bud and the first two or three leaves at the tip of the shoot produce the finest tea, while poorer quality tea is produced from material taken from lower down on the stem. Harvesting is still performed by hand in much of the world, as it takes discrimination to determine which are the best leaves." (Muir)
"Commercially prepared green tea extracts are standardized to contain 60% polyphenols and depending on the method of preparation, the tea may contain 1% to 4% caffeine." (Fetrow)
"When green tea is taken for medicinal purposes, 5-10 ml of the herb is steeped in a cup of boiling water for about 15 minutes. The usual amount taken is 1-3 cups daily, without the addition of milk or sugar. More recently, green tea capsules have been developed for the market, but the clinical benefits of these are unknown." (Kaegi)
"Green tea contains many polyphenols known as catechins, including epigallocathechin-3 gallate (EGCG), epigallocathechin (EGC) and epicathechin-3 gallate (ECG)." (Jankun)
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Last edited by Aeternitas; Tuesday, June 28th, 2005 at 14:07.
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