Extractives of Cercidiphyllum japonicum twigs: isolation and structural elucidation of a new galloylflavonol glycoside, anomeric tannins and flavonoids
Author:
Si Chuan-Ling123, Yang Xianghao1, Li Zijiang1, Lu Jinshun1, Tao Xin1, Zhang Jiayin1, Liu Wei1, Bae Youngsoo4
Affiliation:
1. Tianjin Key Laboratory of Pulp and Paper , Tianjin University of Science and Technology , Tianjin 300457 , P.R. China 2. Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education and Tianjin Key Lab of Industrial Microbiology , Tianjin University of Science and Technology , Tianjin 300457 , P.R. China 3. State Key Laboratory of Pulp and Paper Engineering , South China University of Technology , Guangzhou 510640 , P.R. China , Phone: +86(22)60601313, Fax: +86(22)60602510 4. Department of Forest Biomaterials Engineering , College of Forest and Environment Sciences, Kangwon National University , Chuncheon 24341 , Republic of Korea
Abstract
Abstract
Cercidiphyllum japonicum is a deciduous tree that grows in East Asia, where its raw extracts have long been used in folk medicnes to treat various disorders or diseases. In the current work, extracts from C. japonicum twigs were studied for the first time. Seven individual compounds were isolated from the extracts, including a new galloylflavonol glycoside, namely 8-methoxykaempferol-4′-O-galloyl-3-O-α-L-rhamnopyranoside (VII), and six known phenolics [two anomeric galloyltannins (3,4,6-tri-O-galloyl-β-D-glucopyranoside (I) and 2,2′,5-tri-O-galloyl-α/β-D-hamamelose (III)), one anomeric ellagictannin, pedunculagin (II), one flavonol, kaempferol (V) and two flavonol derivatives (kaempferol-3-O-α-L-rhamnopyranoside (IV) and 8-methoxykaempferol (VI))]. Structural elucidation of I–VII was conducted mainly on the basis of their spectroscopic [ultraviolet (UV), infrared (IR), nuclear magnetic resonance (NMR), mass spectrometry (MS)] and physicochemical analysis, as well as by comparison of the analytical data with those in the literature. Compounds I, II, IV and VI have not yet been reported in the genus Cercidiphyllum. Compound VII, a previously undescribed flavonoid, was isolated and elucidated in this work for the first time.
Publisher
Walter de Gruyter GmbH
Reference35 articles.
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