1997 Fiscal Year Final Research Report Summary
Discoloration and surface deterioration of wood and over-laid wood-based materials by sap-staining fung
| Project/Area Number |
08660204
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
林産学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TAKAHASHI Munezoh Wood Res.Inst., Kyoto Univ.Professor, 木質科学研究所, 教授 (10027162)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIMURA Tsuyoshi lbid. Instructor, 木質科学研究所, 助手 (40230809)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Sap-stain fungi / Blue-stain fungi / Melanin / Aliphatic structure / Jezo spruce / Hot-water extracts / Ethanol / benzene extracts |
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| Research Abstract |
The pigments responsible for the dark blue stain of wood were isolated from liquid shake cultures of two species of blue-stain fungi, Aureobasidium pullulans and Ceratocystis piceae. Elemental and spectroscopic analyzes revealed that the coloring components were melanins and were associated with carbohydrates and proteins.
The fungal melanins are highly condensed polymers of predominantly aliphatic structure whereas the synthetic tyrosin melanin contains a high number of aromatic groups.
Test specimens from sapwood and heartwood of jezo spruce (Picea jezoensis) were extracted with hot water or ethanol/benzene and exposed to the test fungi. Ethanol/benzene-extracted specimens were still stained by both fungi, but hot water-extracted ones were less stained. The results suggest the possible involvement of hot water-extracts in fungal melanin production.
The effect of hot water treatment should be further studied in larger scale to control fungal stain of wood and wood-based composites.
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Research Products
(2 results)
