Abstract: A bioassay-guided in vitro screen has revealed that a 70% methanol extract of the leaves of Salix matsudana shows considerable inhibitory activity against cyclooxygenases (COX-1 and COX-2). A subsequent phytochemical study led to the isolation of a new flavonoid, matsudone A (1), together with five known flavonoids – luteolin (2), isoquercitrin (3), 7-methoxyflavone (4), luteolin 7-O-glucoside (5), 4',7-dihydroxyflavone (6) – and two phenolic glycosides, leonuriside A (7) and piceoside (8). Their structures were elucidated on the basis of extensive 1D- and 2D-NMR studies, high resolution ESI mass spectroscopic analyses and comparisons with literature data. The isolated compounds 1-8 were tested for their inhibitory activities against COX-1 and COX-2. Compounds 1, 5 and 6 were found to have potent inhibitory effect on COX-2 and compounds 3-5 exhibited moderate inhibition against COX-1.
Keywords: Salix matsudana; matsudone A; flavonoid; cyclooxygenase inhibition.
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Li, X.; Liu, Z.; Zhang, X.-F.; Wang, L.-J.; Zheng, Y.-N.; Yuan, C.-C.; Sun, G.-Z. Isolation and Characterization of Phenolic Compounds from the Leaves of Salix matsudana. Molecules 2008, 13, 1530-1537.
Li X, Liu Z, Zhang X-F, Wang L-J, Zheng Y-N, Yuan C-C, Sun G-Z. Isolation and Characterization of Phenolic Compounds from the Leaves of Salix matsudana. Molecules. 2008; 13(8):1530-1537.
Li, Xiang; Liu, Zhi; Zhang, Xin-feng; Wang, Li-juan; Zheng, Yi-nan; Yuan, Chang-chun; Sun, Guang-zhi. 2008. "Isolation and Characterization of Phenolic Compounds from the Leaves of Salix matsudana." Molecules 13, no. 8: 1530-1537.