Adsorption and Transformation Reactions of L-DOPA in Soils (Soil Chemistry and Mineralogy)
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概要
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3-(3',4'-Dihydroxyphenyl)-L-alanine (L-DOPA), which is a component of velvetbean (Mucuna pruriens), displays a high inhibitory activity to plant growth. The inhibitory activity is influenced by the presence of soils, because L-DOPA is eliminated in soils. In the present study, the effect of several soil types (volcanic ash, calcareous, and alluvial soils) on the L-DOPA disappearance was investigated at constant equilibrium pH values. In the presence of soils, L-DOPA disappeared with the reaction time, and the disappearance was associated with three reactions: adsorption reaction (characterized by fast and sudden disappearance of L-DOPA within the initial 8 h period), catalytic transformation reaction (constant L-DOPA disappearance throughout the reaction period), and biotransformation caused by microbial activity (accelerated L-DOPA disappearance observed after 72 h of reaction time). The adsorption and transformation reactions consisted of physicochemical reactions mediated by the presence of soils. The amount of L-DOPA adsorbed was largest in the presence of volcanic ash soil among the three soil types. It is likely that the mechanism of L-DOPA adsorption includes a ligand exchange reaction. In the presence of soils, L-DOPA transformation was observed at equilibrium pH values higher than 4 and it increased with increasing equilibrium pH values. In the absence of soil, however, L-DOPA transformation did not occur at an equilibrium pH value lower than 6.0, indicating that L-DOPA transformation was accelerated by the presence of soil. The rate of L-DOPA transformation mediated by soils at constant equilibrium pH value was in the following order: alluvial soil> calcareous soil> volcanic ash soil. The plant-growth-inhibitory activity of L-DOPA was also reduced by the presence of soils, and the reduction in the case of L-DOPA was more obvious than in the case of 2,4-dichlorophenoxyacetic acid (2,4-D). Based on the reduction effect of soils on the plant-growth-inhibitory activity of L-DOPA (without pH-adjustment), calcareous soil ranked first, followed by volcanic ash soil, then alluvial soil. This was because the calcareous soil showed the highest soil pH value (7.8), and thereby the L-DOPA transformation reaction was accelerated. In soils with high pH values, the plant-growth-inhibitory activity of L-DOPA could therefore not be detected.
- 社団法人日本土壌肥料学会の論文
著者
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Fujii Yoshiharu
National Inst. For Agro‐environmental Sci. Ibaraki
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Hiradate Syuntaro
Department of Bioresources Science, National Institute of Agro-Environmental Sciences
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Hiradate Syuntaro
Department Of Biological Safety Science National Institute For Agro-environmental Sciences
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Fujii Yoshiharu
Department Of Biological Safety Science National Institute For Agro-environmental Sciences (niaes)
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Furubayashi Akihiro
Department Of Biological Safety Science National Institute For Agro-environmental Sciences (niaes)
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Fujii Yoshiharu
Department Of Biological Safety Science National Institute For Agro-environmental Science
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Hiradate Syuntaro
Department Of Biological Safety Science National Institute For Agro-environmental Science
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Hiradate Syuntaro
Biodiversity Division National Institute For Agro-environmental Sciences (niaes)
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