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Ellagitannins and Oligomeric Proanthocyanidins of Three Polygonaceous Plants.


ABSTRACT: The aim of this study was to characterize hydrolyzable tannins in Polygonaceous plants, as only a few plants have previously been reported to contain ellagitannins. From Persicaria chinensis, a new hydrolyzable tannin called persicarianin was isolated and characterized to be 3-O-galloyl-4,6-(S)-dehydrohexahydroxydiphenoyl-d-glucose. Interestingly, acid hydrolysis of this compound afforded ellagic acid, despite the absence of a hexahydroxydiphenoyl group. From the rhizome of Polygonum runcinatum var. sinense, a large amount of granatin A, along with minor ellagitannins, helioscpoinin A, davicratinic acids B and C, and a new ellagitannin called polygonanin A, were isolated. Based on 2D nuclear magnetic resonance (NMR) spectroscopic examination, the structure of polygonanin A was determined to be 1,6-(S)-hexahydroxydiphenoyl-2,4-hydroxychebuloyl-?-d-glucopyranose. These are the second and third hydrolyzable tannins isolated from Polygonaceous plants. In addition, oligomeric proanthocyanidins of Persicaria capitatum and P. chinensis were characterized by thiol degradation. These results suggested that some Polygonaceous plants are the source of hydrolyzable tannins not only proanthocyanidins.

SUBMITTER: Li YQ 

PROVIDER: S-EPMC7828057 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Ellagitannins and Oligomeric Proanthocyanidins of Three Polygonaceous Plants.

Li Yun-Qiu YQ   Kitaoka Masako M   Takayoshi Juri J   Wang Ya-Feng YF   Matsuo Yosuke Y   Saito Yoshinori Y   Huang Yong-Lin YL   Li Dian-Peng DP   Nonaka Gen-Ichiro GI   Jiang Zhi-Hong ZH   Tanaka Takashi T  

Molecules (Basel, Switzerland) 20210111 2


The aim of this study was to characterize hydrolyzable tannins in Polygonaceous plants, as only a few plants have previously been reported to contain ellagitannins. From <i>Persicaria chinensis</i>, a new hydrolyzable tannin called persicarianin was isolated and characterized to be 3-<i>O</i>-galloyl-4,6-(<i>S</i>)-dehydrohexahydroxydiphenoyl-d-glucose. Interestingly, acid hydrolysis of this compound afforded ellagic acid, despite the absence of a hexahydroxydiphenoyl group. From the rhizome of  ...[more]

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