Wollenweber E, Wehde R, Dörr M, Lang G, Stevens J F
Institut für Botanik der Technischen Universität, Darmstadt, Germany.
Phytochemistry. 2000 Dec;55(8):965-70. doi: 10.1016/s0031-9422(00)00348-4.
The thin waxy coatings on leaves of nine species of Callistemon, two of Melaleuca and one species of Metrosideros, have been studied for the occurrence of leaf surface flavonoids. The Callistemon species and Metrosideros robusta exhibit only C-methylated flavonoids, while O-methyl flavonoids were detected in Melaleuca huegelii. The new natural C-methyl flavonol, 5,7-dihydroxy-3,8,4'-trimethoxy-6-C-methylflavone, was isolated from Metrosideros robusta. The leaf wax of Callistemon coccineus contains the novel C-methylflavonoid, 5,4'-dihydroxy-8-C-methyl-7-methoxy flavanone.
对红千层属9个物种、白千层属2个物种及铁树属1个物种叶片上的薄蜡质涂层进行了研究，以检测叶表面黄酮类化合物的存在情况。红千层属物种和粗壮铁树仅表现出C - 甲基化黄酮类化合物，而在白千层中检测到了O - 甲基黄酮类化合物。从粗壮铁树中分离出了新的天然C - 甲基黄酮醇，5,7 - 二羟基 - 3,8,4'-三甲氧基 - 6 - C - 甲基黄酮。红千层的叶蜡含有新型C - 甲基黄酮类化合物，5,4'-二羟基 - 8 - C - 甲基 - 7 - 甲氧基黄烷酮。
