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영어

Camellia is valued not only for its aesthetic contribution as ornament but also for its economic importance as it provides the beverage, tea, and edible oil in some countries, notably China. Apart from its use for ornamental purposes and production of tea, it is one of the four main oil-bearing trees (palm, coconut, olive, and tea) in the world. Camellia oleifera C. Abel, which originated in southern China, is notable as an important source of edible oil obtained from its seeds. It is commonly known as the oil-seed camellia or tea oil camellia, though to a lesser extent other species of Camellia are used in oil production too. Camellia japonica, one of the other tea trees, is distributed in Korea, China, Taiwan, and Japan. Previous studies have revealed that Camellia oleifera has significant biological activities and includes various kinds of chemical constituents such as terpenoids and flavonoids in its leaves, roots, seeds and fruit shells. The others also have reported the recent advances in the utilization of Camellia oleifera C. Abel through a review of nutritional constituents, bio-functional properties, and potential industrial applications. However, there was no study on nut shell extractives of Camellia oleifera even in China and moreover, hydrolysable tannins of the nut shell have never been reported yet. A phytochemical study of fruit shell of Camellia oleifera C. Abel led to the isolation of two ellagitannins, tellimagrandinⅠ(3) and tellimagrandin Ⅱ(4), including gallic acid (1) and ellagic acid (2). The structures of the isolated compounds were unambiguously elucidated on the basis of comprehensive spectroscopic data, especially 2D NMR such as HSQC and HMBC and MS data. Compounds 3 and 4 were first isolated from the extractives of Camellia oleifera fruit shell.