Manufacture of wood-cement boards VIII: cement-hardening inhibitory compounds of keyaki (Japanese zelkova, <Emphasis Type="Italic">Zelkova serrata</Emphasis>) |
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Authors: | Yasuyuki Matsushita Shigeru Miyawaki Seiichi Yasuda |
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Institution: | (1) Division of Biological Materials Sciences, Department of Biosphere Resources Science, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan Tel. +81-52-789-4159; Fax +81-52-789-4163 e-mail: syasuda@agr.nagoya-u.ac.jp, JP |
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Abstract: | To isolate and identify the cement-hardening inhibitory components of keyaki (Japanese zelkova, Zelkova serrata Makino), methanol extractives containing inhibitory components were fractionated by successive organic solvent extraction
and column chromatography, and the inhibition of these fractions was determined. Spectroscopic analysis of one isolated compound
identified it to be keyakinin with the C-glucoside structure of a flavonol. According to the inhibitory indices, the compound
was found to be the main cement-hardening inhibitory component of keyaki. Extraction of keyaki with hot water or a blend of
keyaki with up to 30% hinoki as a suitable species diminished the cement-hardening inhibition of wood-cement board to a great
extent, suggesting that such treatments are economical countermeasures to this inhibition.
Received: April 17, 2002 / Accepted: June 24, 2002
Acknowledgments The authors thank Dr. W. Nagadomi, Nichiha Co., for providing Japanese zelkova wood. This research was conducted with the
support of the TOSTEM Foundation for Construction Materials Industry Promotion. |
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Keywords: | Wood-cement board Zelkova serrata Cement-hardening inhibitory compound Keyakinin |
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