- Constituents of Geranium thunbergii Sieb. et Zucc. XV. Modified dehydroellagitannins, geraniinic acids B and C, and phyllanthusiin F
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Three new hydrolyzable tannins, geraniinic acids B and C, and phyllanthusiin F, were isolated from the water-soluble portion of 70% aqueous acetone homogenate of the Geranium thunbergii leaves and their structures were determined by spectroscopic and chemical methods. These tannins are regarded as modified metabolites of geraniin, a major component of this plant. Phyllanthusiins, which are tannins characteristic of the Phyllanthus species of Euphorbiaceae, were also isolated from this plant.
- Ito, Hideyuki,Hatano, Tsutomu
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- Tannins and Related Compounds. LXXXVII. Isolation and Characterization of Four New Hydrolyzable Tannins from the Leaves of Mallotus repandus
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A chemical examination of the leaves of Mallotus repandus (WILLD.) MUELLER-ARG. (Euphorbiaceae) has led to the isolation of four new hydrolyzable tannins, named repandusinin (10), repandusinic acids A (11a) and B (14a) (as monopotassium salts) and malloti
- Saijo, Reiko,Nonaka, Gen-ichiro,Nishioka, Itsuo
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p. 2624 - 2630
(2007/10/02)
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- PUNICAFOLIN, AN ELLAGITANNIN FROM THE LEAVES OF PUNICA GRANATUM
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A new ellagitannin, punicafolin has been isolated from the leaves of Punica granatum and characterized by physicochemical data and spectral evidence as 1,2,4-tri-O-galloyl-3,6-(R)-hexahydroxydiphenoyl-β-D-glucose.The occurrence in the leaves of the known tannins, granatins A and B, corilagin, strictinin, 1,2,4,6-tetra-O-galloyl-β-D-glucose and 1,2,3,4,6-penta-O-galloyl-β-D-glucose has also been demonstrated.Key Word Index -Punica granatum; Punicaceae; pomegranate; punicafolin; ellagitannin; gallotannin.
- Tanaka, Takashi,Nonaka, Gen-Ichiro,Nishioka, Itsuo
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p. 2075 - 2078
(2007/10/02)
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- The Metabolism of Gallic Acid and Hexahydroxydiphenic Acid in Plants. Part 3. Esters of (R)- and (S)-Hexahydroxydiphenic Acid and Dehydrohexahydroxydiphenic acid with D-Glucopyranose (1C4 and Related Conformations)
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In a small group of plants a process of further metabolism of galloyl-D-glucose esters occurs in which oxidative coupling takes place between galloyl ester groups in the 1,6:2,4 or 3,6-position of D-glucopyranose in its least favoured 1C4
- Haddock, Elizabeth A.,Gupta, Raj K.,Haslam, Edwin
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p. 2535 - 2546
(2007/10/02)
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