Phenolic Antioxidants from the Leaves of Camellia pachyandra Hu.
Phenolic Antioxidants from the Leaves of Camellia pachyandra Hu.
复制标题
来自山茶花叶子的酚类抗氧化剂。
DOI：
10.1021/jf101490r
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发表时间：
2010-08-11
影响因子：
6.1
通讯作者：
Zhang, Ying-Jun
中科院分区：
文献类型：
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作者：
Gao, Da-Fang;Xu, Min;Zhang, Ying-Jun
厚蕊茶是山茶科山茶属山茶组（Camellia sect. Heterogenea）的一个种，其叶子被用于制作茶叶，并被生活在中国云南省的当地人食用。这是首次对该属植物叶的化学成分进行研究。从茯苓中分离得到22个酚类化合物，其中包括9个水解单宁（1-9），11个黄酮醇苷（10-20）和2个简单酚类化合物（21，22）。结果表明，该植物叶中不含咖啡因和儿茶素，主要成分为水解单宁，其中鞣花单宁5的含量高达3.7%。采用DPPH自由基清除试验和酪氨酸酶抑制试验对分离菌株的抗氧化活性进行了评价。虽然不含咖啡因和儿茶素的次生代谢产物与一般食用的茶树不同，但研究结果表明，茶树叶片中的咖啡因和儿茶素含量较高。茯苓中含有丰富的可水解单宁类抗氧化剂，可开发为不含咖啡因的天然饮料的理想资源。
Camellia pachyandra Hu. is a species in Camellia sect. Heterogenea (Theaceae), whose leaves have been used for making tea and consumed by the local people living in Yunnan province, China. This is the first investigation of the chemical constituents in the leaves of C. pachyandra, from which 22 phenolic compounds including nine hydrolyzable tannins (1-9), 11 flavonol glycosides (10-20), and two simple phenolics (21, 22) were isolated. It was noted that the leaves of the title plant contained no caffeine and no catechin, whereas hydrolyzable tannins were found to be the major constituents, of which the content of ellagitannin 5 reached to 3.7%. All the isolates were evaluated for their antioxidant activities by DPPH radical scavenging and tyrosinase inhibitory assays. Though the secondary metabolites without caffeine and catechins are different from the commonly consumed tea plants, the results suggested that the leaves of C. pachyandra, rich in hydrolyzable tannins as potent antioxidants, could be developed as an ideal resource for a natural beverage without caffeine.