Characteristics of a Newly Isolated Fungus, Geotrichum candidum Dec 1,Which Decolorizes Various Dyes

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A fungus, Geotrichum candidum Dec 1,newly isolated from soil as a dye-decolorizing microorganism, decolorized 18 kinds of reactive, acidic and dispersive dyes and 3 model compounds on a solid medium, showing a broad spectrum of decolorization. Except for dispersive dyes, all the dyes used on the solid medium were also decolorized even in a liquid medium, although the decolorizing rates varied depending on the dye structure. By repeated addition of one dye, Reactive blue 5,about 12 g/l of the dye was degraded without significant decline of activity, showing the resistant property of Dec 1 to high concentration of the dye. An energy source and oxygen were essential for the expression of decolorizing activity; the optimal temperature was 30℃. A crude extracellular enzyme solution, in which the decolorizing activity was more than 100 times that of the Dec 1 culture broth, showed peroxidase activity, indicating that some peroxidases are responsible for dye-decolorization.
社団法人日本生物工学会の論文
1995-06-25