Antioxidant Properties of Extracts from Camellia tenuifolia

in English journal, 英文期刊
標題Antioxidant Properties of Extracts from Camellia tenuifolia
AuthorsChen-Lan Wang, 王振瀾, Fu-Lan Hsu 許富蘭, & Hong-Lin Lee 李鴻麟
出版日期2006 / 12

Samples of the leaves, flowers and peels from oil-tea tree (Camellia tenuifolia (Hay.) Cohen-Stuart) were extracted with a 75% ethanol solution. The extract contents were found to be about 15~25%. The total phenolic contents of the extracts from different samples were determined by the Folin-Ciocalteu method and were found to be in the range of 95~135 mg gallic acid equivalent/g, with the respective content order as that of leaves peels > flowers. In addition, the DPPH free radical-scavenging rates of the extract solutions were observed to be greater than 90% for leaves and peels, superior to 60~65% of the flower extract at the same concentration (50 μg/ml). The inhibition effects of extracts on MeLo oxidation revealed that the leaf extract presented the highest
inhibition rate, slightly better than that of peel extract, while that of the flower extract was the lowest. Moreover, the test of linoleic acid oxidation detected with thiobarbituric acid revealed that the peel extract demonstrated the highest reduction of aldehyde production from linoleic oxidation, with leaf extract the next and flower extract the lowest. From these experimental results, a positive correlation between total phenolic contents and antioxidant properties of the extracts was also confirmed.

期刊名稱Taiwan Journal of Forest Science
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