文献类型：期刊文献

英文题名：Bark extractives of Catalpa bungei: isolation, purification and structural elucidation of triterpene, phytosterol and flavonoid derivatives

作者：Xu, Jiayun[1] Lu, Nan[2] Liu, Kun[1] Liu, Huayu[1] Wang, Zhi[2] Bae, Youngsoo[3,4] Si, Chuan-Ling[1,2] Wang, Junhui[2]

第一作者：Xu, Jiayun

通信作者：Si, CL[1];Si, CL[2];Wang, JH[2]

机构：[1]Tianjin Univ Sci & Technol, Tianjin Key Lab Pulp & Paper, Tianjin 300457, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat State Forestry A, Beijing 100091, Peoples R China;[3]Kangwon Natl Univ, Coll Forest & Environm Sci, Div Forest Mat Sci & Engn, Chunchon 243411, South Korea;[4]Jiangxi Acad Forestry, Nanchang 33032, Jiangxi, Peoples R China

年份：2021

卷号：55

期号：1

起止页码：231-241

外文期刊名：WOOD SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20204509449525);Scopus(收录号：2-s2.0-85094879196);WOS:【SCI-EXPANDED(收录号:WOS:000585020900001)】；

基金：This work was kindly supported by National Key Research and Development Program of China (2017YFD0600604), Key Technology Research and Development Program of Tianjin (19YFZCSN00950), and Tianjin Enterprise Technology Commissioner Project (19JCTPJC52800). The plant samples were authenticated by Professor J.H. Wang from Research Institute of Forestry, Chinese Academy of Forestry, Beijing, P.R. China.

语种：英文

外文关键词：Forestry - Metabolites - Spectroscopic analysis

摘要：Extractives of tree barks have long been considered as a rich source of novel bioactive secondary metabolites, which are by far not well-explored. In the current work, bark extracts of Catalpa bungei were investigated for the first time and five extractives were isolated and purified, including a new triterpene saponin derivative, namely 3-O-beta-D-glucuronopyranosyl-6 '-methyl-21-O-cis-caffeoyl machaerinic acid (4), two known flavonoids [(+)-gallocatechin (1) and isoquercitrin-6 ''-gallate (2)], a known oleanane-type triterpene [machaerinic acid (3)] and a known phytosterol [stigmasterol (5)]. Chemical structural elucidation of extractives 1-5 was carried out mainly on the basis of their physicochemical and spectroscopic (IR, NMR, MS) evidences and analysis, as well as by detailed comparison of the analytical evidence with those in the literature. To the best of the authors' knowledge, this is the first time to find the occurrence of extractives 1-5 in the tree of C. bungei. It is noteworthy that the five constituents have never previously been reported in any species of Catalpa genus. Compound 4, a previously undescribed triterpene saponin derivative, was isolated and elucidated in this work for the first time.