An Absorption Mechanism for the Decolorization of Melanoidin by Rhizoctonia sp. D-90
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概要
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Rhizoctonia sp. D-90 decolorized molasses melanoidin medium and a synthetic melanoidin medium by 87.5% and 84.5%, respectively, under experimental growth conditions. Mycelia grown in solutions of melanoidin turned dark brown. However, the melanoidin (dark brown in color) could be eluted from the mycelia by washing in a solution of NaOH, and the maximum yield of melanoidin from mycelia reached 96. 1%. Mycelia grown in potato dextrose medium did not have any electron-dense materials in the cytoplasm or around the cell membrane, but when such mycelia were transferred to melanoidin media, abundant electron-dense material appeared in the cytoplasm and around cell membranes. Subsequently, the electron-dense materials disappeared when the mycelia were returned to the potato dextrose medium for further growth. The mechanism of decolorization of melanoidin by Rhizoctonia sp. D-90 involved absorption of the melanoidin pigment by the cells as a macromolecule and its intracellular accumulation in the cytoplasm and around the cell membrane as a melanoidin complex, which was then gradually decolorized by intracellular enzymes.
- 1995-07-23
著者
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Sirianuntapiboon Suntud
Thailand Institute of Scientific and Technological Research (TISTR)
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Sihanonth Prakitsin
Department of Microbiology, Faculty of Science, Chulalongkorn University
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Somchai Praphaisri
Thailand Institute of Scientific and Technological Research (TISTR)
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Atthasampunna Poonsook
Thailand Institute of Scientific and Technological Research (TISTR)
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Hayashida Shinsaku
Department of Agricultural Chemistry, Faculty of Agriculture, Kyushu University
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Atthasampunna P
Thailand Inst. Scientific And Technological Res. Bangkok Tha
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Atthasampunna Poonsook
Thailand Institute Of Scientific And Technological Research
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Sirianuntapiboon Suntud
Thailand Inst. Sci. Technol. Res.
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Hayashida Shinsaku
Department Of Agricultural Chemistry
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Hayashida Shinsaku
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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Sihanonth Prakitsin
Department Of Microbiology Faculty Of Science Chulalongkorn University
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