INFLUENCE OF CULTIVATION CONDITIONS ON CELLULASE AND XYLANASE ACTIVITY OF RHIZOPUS ORYZAE F-1030
UDK 663.15
Abstract
The paper examines the relationship between the activity of cellulase and xylanase enzymes and the lactic acid yield which was synthesized by the fungus Rhizopus oryzae F-1030 during its cultivation on a culture medium based on catalytically modified neutral sulfite liquors. It was shown that in cultivating by the deep method the fungus R. oryzae F-1030 synthesizes xylanase and cellulase enzymes that break down polysaccharides in a nutrient medium to simple sugars which are easily accessible for assimilation by the fungus. Accordingly, the fungus R. oryzae F-1030 can be used as a promising biotechnological object for the bioconversion of cellulose production secondary resources. It was found that the level of cellulase and xylanase expression in R. oryzae F-1030 depends on the type of substrate. The xylanase activity of the fungus is more pronounced than the cellulase activity since xylan oligomers predominate in birch wood. It was noted that the lactic acid yield during the cultivation of the fungus R. oryzae F-1030 on a catalytically modified neutral sulfite liquor depends on the action specifics of the hydrolyzing catalyst. As a nutrient medium for the microbiological synthesis of lactic acid the fungus R. oryzae F-1030 can use biocatalytically treated liquors of birch wood neutral sulfite pulping.
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