| アイテムタイプ |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2023-11-07 |
| タイトル |
|
|
タイトル |
Oligomerization Mechanisms of Tea Catechins Involved in the Production of Black Tea Thearubigins |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
black tea |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
thearubigins |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
catechin |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
dehydrotheasinensin |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
quinone |
| キーワード |
|
|
言語 |
en |
|
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 |
Hashiguchi, Keigo
Teramoto, Sena
Katayama, Kohei
Matsuo, Yosuke
Saito, Yoshinori
Tanaka, Takashi
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
Thearubigins (TRs) are chemically ill-defined black tea pigments composed of numerous catechin oxidation products. TRs contain oligomeric components; however, the oligomerization mechanisms are poorly understood. The comparison of the 13C nuclear magnetic resonance (NMR) spectra of TRs with different molecular sizes suggested the participation of A-ring methine carbons in the oligomerization. Crushing fresh tea leaves with phloroglucinol, a mimic of the catechin A-rings, yielded the phloroglucinol adducts of the B-ring quinones of pyrogallol-type catechins and dehydrotheasinensins, indicating that intermolecular oxidative couplings between pyrogallol-type B-rings and A-rings are involved in the oligomerization. This is supported by the comparison of the 13C NMR spectra of the oligomers generated from the dehydrotheasinensins and epicatechin. Furthermore, the presence of the quinones or related structures in the catechin oligomers is shown by condensation with 1,2-phenylenediamine. The pyrogallol-type catechins account for approximately 70% of tea catechins; therefore, the B–A ring couplings of the pyrogallol-type catechins are important in the catechin oligomerization involved in TR production. |
|
言語 |
en |
| 書誌情報 |
en : Journal of Agricultural and Food Chemistry
巻 71,
号 41,
p. 15319-15330,
発行日 2023-10-09
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| 出版者 |
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|
出版者 |
American Chemical Society |
|
言語 |
en |
| ISSN |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
0021-8561 |
| DOI |
|
|
関連タイプ |
isIdenticalTo |
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|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1021/acs.jafc.3c05007 |
| 権利 |
|
|
権利情報 |
© 2023 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of agricultural and food chemistry, copyright (c) American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.jafc.3c05007. |
|
言語 |
en |
| 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 |
Journal of agricultural and food chemistry, 71(41), pp.15319-15330; 2023 |
|
言語 |
en |
JAFC71_15319.pdf (2.5 MB)
