Flavonoids from Taxillus theifer
TUNG-HU TSAI2,3, YI-CHEN LIU1 AND LIE-CHWEN LIN1,2,4*
1. National Research Institute of Chinese Medicine, Taipei, Taiwan, R.O.C.
2. Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan, R.O.C.
3. Department of Education and Research, Taipei City Hospital, Taipei, Taiwan, R.O.C.
4. Graduate Institute of Integrated Medicine, China Medical University, Taichung, Taiwan, R.O.C.
(Received: November 28, 2009; Accepted: April 28, 2010)
ABSTRACT
A new catechin derivative, catechin-5-O-(6-O-galloyl-β-glucopyranoside) (2), together with ten known flavonoids, was isolated from the leaves and stems of Taxillus theifer (Hayata) H. S. Kiu. T. theifer is a shrub parasitizing on different species of plants. Three samples of T. theifer on various host plants were collected and their chemical constituent variations were identified and estimated by HPLC/UV methods. A comparison of the constituents from T. theifer parasitizing on different host trees demonstrated that catechin (1), quercetin-3-O-(6-O-galloyl-β-glucopyranoside) (3), quercetin-3-O-β-glucopyranoside (5), and quercetin-3-O-β-glucuronide (6) were the major components in the title plant irrespective of the host tree. However, the content of some components varies for each sample.
Key words: Taxillus theifer, Scurrula ritozanensis, Loranthaceae, catechin-5-O-(6-O-galloyl-β-glucopyranoside), flavonoid