- Hydrolyzable tannins with the hexahydroxydiphenoyl unit and the m-depsidic link: HPLC-DAD-MS identification and model synthesis
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This study was designed to develop efficient analytical tools for the difficult HPLC-DAD-MS identification of hydrolyzable tannins in natural tissue extracts. Throughout the study of the spectroscopic characteristics of properly synthesized stereodefined
- Arapitsas, Panagiotis,Menichetti, Stefano,Vincieri, Franco F.,Romani, Annalisa
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- Novel Metabolites of Hexahydroxydiphenic Acid Esters (Ellagitannins) from Carpinus japonica
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The unique hydrated biscyclohexenetrione structures (1)-(4) of carpinins A-D, the metabolites of hexahydroxydiphenic acid esters (ellagitannins) isolated from the leaves of Carpinus japonica, are described.
- Nonaka, Gen-ichiro,Mihashi, Kunihide,Nishioka, Itsuo
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p. 790 - 791
(2007/10/02)
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- Structure of isorugosin b, and the orientation of valoneoyl group in the related monomeric, dimeric and trimeric hydrolyzable tannins
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A new hydrolyzable tannin, named isorugosin B (1), was isolated from Liquidambar formosana, and the structure in which the orientation of valoneoyl group at 0-4 ~ 0-6 of the glucose core is the reverse of that in rugosin B (2) and in rugosin A (3), was determined. The orientation of valoneoyl group in rugosin A (3) was established by the long range 1H13C correlation nmr spectroscopy. The structures of rugosins D (6), E (7) and G (8), coriariins C (9), D (10), E (11) and F (12), cornusiin A (13), camptothins A (b15) and B (16), were fully established on the basis of chemical correlations with 1 or 3.
- Hatano, Tsutomu,Kira, Reiko,Yasuhara, Taeko,Okuda, Takuo
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p. 2081 - 2085
(2007/10/02)
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