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Enzymatic oxidation of ellagitannin and a new ellagitannin metabolite from Camellia japonica leaves
http://hdl.handle.net/10069/37424
http://hdl.handle.net/10069/3742469e99d49-bdb9-43ab-9b29-5860675783de
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Supple.pdf (4.5 MB)
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Tetra73_500.pdf (415.1 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-02-03 | |||||
タイトル | ||||||
タイトル | Enzymatic oxidation of ellagitannin and a new ellagitannin metabolite from Camellia japonica leaves | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | 2H-2-Oxo-pyran-6-carboxylic acid | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Camellia japonica | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Camelliatannin | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Catechin | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Ellagitannin | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Oxidation | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Tsujita, Takaaki
× Tsujita, Takaaki× Matsuo, Yosuke× Saito, Yoshinori× Tanaka, Takashi |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Polyphenols in the leaves of Camellia japonica L. at different stages of growth were analyzed by HPLC. Pedunculagin [2,3; 4,6-bis-(S)-hexahydroxydiphenoyl-D-glucose] was the major polyphenol in the youngest leaves. The levels of this compound and (+)-catechin decreased as the leaves matured. The level of (?)-epicatechin did not change with leaf maturity. Enzymatic oxidation of pedunculagin was examined to investigate the mechanism of the decrease. Pedunculagin was not directly oxidized by treatment with oxidative enzymes. However, when (+)-catechin was added to the reaction mixture, the pyrogallol rings of the 4,6-hexahydroxydiphenoyl group was oxidatively cleaved to give 2H-2-oxo-pyran-6-carboxylic acid. The in vitro oxidation products were not detected in fresh leaves, but two pedunculagin oxidation products conjugated with flavan-3-ol were isolated. A new metabolite, camelliatannin I, was isolated and characterized by spectroscopic and density functional theory calculation of NMR chemical shifts. | |||||
書誌情報 |
Tetrahedron 巻 73, 号 5, p. 500-507, 発行日 2017-02-02 |
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出版者 | ||||||
出版者 | Elsevier Ltd. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00404020 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1016/j.tet.2016.12.027 | |||||
権利 | ||||||
権利情報 | c 2016 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Tetrahedron, 73(5), pp.500-507; 2017 |