الفهرس Only 14 pages are availabe for public view
 |  | from | 165 |  |  |
| | | from | 165 | | |
Abstract
tea is one of the most widely consumed beverages in the world today, second only to, and its medicinal properties have been widely explored. three billion kilograms of tea ara produced each year worldwide. because of the high rates of tea consumption in the global population, it has been estimated that even small effects in humans could have large implicatin for puplic health. tea is generally consumed in the forms of green, oolong, and black tea, all of which originate from the leaves of the plant camellia sinensis. differences of composition between green tea and other teas (oolong and black teas) are mainly due to the oxidation steps occurring during the fermentation process which usually divided into three basic types: green tea (nonfermented), oolong tea (semifermented) and black tea (fully fermented).