2002 Fiscal Year Final Research Report Summary
Mechanism of the Removal of Aluminum Toxicity for Plant by Chemically Modified Lignins
| Project/Area Number |
12460074
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
MESHITSUKA Gyosuke Graduate School of Agricultural and Life Sciences, Professor, 大学院・農学生命科学研究科, 教授 (30012074)
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| Co-Investigator(Kenkyū-buntansha) |
KATSUMATA Kyoko Asian Natural Environmental Science Center, Post-doctorate Researcher, アジア生物資源環境研究センター, 研究機関研究員 (70313319)
SHINTANI Hiroyuki Graduate School of Agricultural and Life Sciences, Assisitant Professor, 大学院・農学生命科学研究科, 助手 (30282693)
MATSUMOTO Yuji Graduate School of Agricultural and Life Sciences, Associate Professor, 大学院・農学生命科学研究科, 助教授 (30183619)
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| Project Period (FY) |
2000 – 2002
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| Keywords | Lignin / Soil conditioning agent / Aluminum ions / Forest / Acid soil / Alkaline oxygen oxidation / Complex formation / Root |
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| Research Abstract |
Toxic effect of aluminum ions to plants is generally observed in the area of acidic soil, and is particularly serious if the sound surface soil is lost in which humic substances have important functions to remove those toxic effect. The authors have found that chemically modified lignins by radical sulfonation and alkaline-oxygen oxidation have the functions similar to the humic substances. The aims of this research were to find out the mechanisms why the chemically modified lignins had those positive effect.
It was found that at least four different types of acid groups were introduced into the modified lignins, namely strong acid group, weak acid groups I - III. Strong acid group should be sulfonic acid group introduced by radical sulfonation reaction. Weak acid group I seems to be the aromatic carboxylic acid, and catecholic and muconic acid structures are included in weak acid group II. By the addition of aluminum, amount of acid groups, particularly weak acid group I was found to increase indicating the release of acidic proton by the formation of aluminum-lignin complex, which was also confirmed by ^<27>AL-NMR.
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