P-32 クリおよびノグルミ材におけるポリフェノール成分の構造と分布(ポスター発表の部)

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Tannins and related polyphenols in the sapwood, intermediate wood and heartwood of C. crenata (Fagaceae) and P. strobilacea (Juglandaceae) were compared by reversed-phase HPLC. In the wood of C. crenata, C-glycosidic ellagitannins (castalagin and vescalagin) are accumulated with the heighest concentration at the sapwood-heartwood transition. One timer (MW 2766), two tetramers (MW 3682) and one pentamer (MW 4598) of the C-glycosidic ellagitannins were isolated from the aqueous acetone extract together with two known dimers, and their structures were determined on the basis of spectroscopic evidence. Three new compounds designated castacrenins A, B and C were isolated from the inner heartwood and structurally characterized. In the wood of P. strobilacea, 4-O-xylosides of ellagic acid, 3'-O-methylellagic acid and 3,3'-di-O-methylellagic acid were found in the sapwood; however, these glycosides were completely hydrolyzed in the heartwood liberating aglycons. Some known ellagitannins similar to those in its bark were accumulated in the heartwood, although these were scarcely found in the sapwood. Furthermore, (3S, 4S)-3-methyl-4-β-glucopyranoxy-octanoic acid, and its 6'-O-gallate were isolated. These compounds were considered to be the precursor of whisky lactone (quercus lactone) and their content was increased from the sapwood to the heartwood. In addition, two sesquiterpens [3-cadalenol and (-)-(7S, 10R)-3-hydroxycalamenene] and a new diarylheptanoid [4,17-dimethoxy-2-oxatricyclo[13,2,2,1^<3,7>]eicosa-3,5,7(20),15,17,18-hexaene-10(R)-ol] were isolated as the characteristic metabolites to the heartwood.
天然有機化合物討論会の論文
1995-09-01

P-32 クリおよびノグルミ材におけるポリフェノール成分の構造と分布(ポスター発表の部)

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