Extractives of Quercus crispula sapwood infected by the pathogenic fungi Raffaelea quercivora I: comparison of sapwood extractives from noninfected and infected samples

被引:0
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作者
Kayoko Imai
Tohru Mitsunaga
Hiroyuki Takemoto
Toshihiro Yamada
Shin-ichiro Ito
Hideo Ohashi
机构
[1] Gifu University,Department of Applied Life Science, Faculty of Applied Biological Sciences
[2] Kyoto University,Center for Ecological Research
[3] The University Forest,Experimental Section at Chiba
[4] The University of Tokyo,Department of Sustainable Resource Sciences, Faculty of Bioresources
[5] Mie University,undefined
来源
Journal of Wood Science | 2009年 / 55卷
关键词
Gallotannins; Ellagitannins; Tannase;
D O I
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中图分类号
学科分类号
摘要
The extracts of Quercus crispula infected by the ambrosia fungus, Raffaelea quercivora, were investigated. Phenol and tannin analyses indicated that normal sapwood (NS) contained a considerable amount of hydrolysable tannins, while infected colored sapwood (IS) contained less hydrolysable tannins and more phenols than NS. In treating pentagalloyl glucose (PGG), which is a model compound of hydrolysable tannins, with a culture medium of R. quercivora, PGG was rapidly hydrolyzed to produce gallic acid. The resulting gallic acid decreased in concentration over the subsequent cultivation period eventually disappeared. Measuring tannase and laccase activities of the culture medium of R. quercivora, tannase activity increased gradually from the beginning, while laccase activity increased rapidly at 5 days of incubation and disappeared at 8 days. An oxidative product from gallic acid treated with laccase was isolated by preparative high performance liquid chromatography, and was identified as purprogallincarboxylic acid (PGCA) by nuclear magnetic resonance spectroscopy and electron-impact mass spectrometry. PGCA was present in a 70% aqueous acetone extract of IS, and showed slight growth inhibition against R. quercivora.
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页码:126 / 132
页数:6
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