BEHAVIOR OF PHENOLIC SUBSTANCES IN THE DECAYING PROCESS OF PLANTS : III. Degradation Pathway of Phenolic Acids
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概要
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p-Coumaric, ferulic, vanillic, and p-hydroxybenzoic acids, the main phenolics in rice straw and its decayed products, were incubated at 50℃ at concentrations of 30 ppm in dilute water-extract solutions of decayed straw and soil. The dynamics of the individual phenolics and their degradation products were studied, and the fate and behavior of each phenolic acid in the decaying process of plants were also discussed. The following results were obtained : 1) These phenolic acids were degraded rapidly in a short period. Their half lives were less than 10 days under the experimental conditions used here. 2) The degradation rates of p-hydroxybenzoic and p-coumaric acids were approximately the same in both extract solutions of decayed straw and soil, but vanillic and ferulic adds, which contain methoxy groupings, disappeared much more rapidly in the soil extract solution than in the decayed straw extract solution. 3) When these 4 phenolic acids were added all together into the decayed straw extract solution, they were degraded more slowly than in solutions of individual acids, especially p-coumaric and ferulic acids which are cinnamic acid derivatives. 4) A major degradation product of p-coumaric acid, after treatment with diazomethane, was isolated by preparative gas chromatography and determined as p-methoxycinnamic acid methylester by IR spectroscopy and mass spectrometry. The product itself was identified as p-methoxycinnamic acid by co-chromatography with the authentic sample. A major degradation product of ferulic acid was identified as 3,4-dimethoxycinnamic acid in the same way. 5) p-Coumaric and ferulic acids were transformed rapidly to large amounts of p-methoxycinnamic and 3,4-dimethoxycinnamic acid, respectively, by probably reversible reactions. These in turn were gradually transformed into small amounts of p-hydroxybenzoic acid and vanillic acid, respectively. p-Hydroxybenzoic acid was rapidly transformed to protocatechuic acid. Vanillic acid was rapidly degraded, but no product was detected by gas chromatography. 6) The possible degradation pathway of these phenolic acids in the decaying process of plants is presented.
- 社団法人日本土壌肥料学会の論文
著者
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Shindo Haruo
Faculty Of Agriculture Nagoya University : (present Address) Faculty Of Agriculture Yamaguchi Univer
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Shindo Haruo
Faculty Of Agriculture Nagoya University:(present Address)faculty Of Agriculture Yamaguchi Universit
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Shindo Haruo
Faculty Of Agriculture Nagoya University
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