PRODUCTION OF GLYCOHYDROLASES FROM RESIDUES FROM THE FLOUR INDUSTRY BY Aspergillus niger
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The liquid from cassava processing and the peel are agro-waste produced by the flour industry, a sector of great economic importance in Brazil. These residues can cause environmental impacts when disposed of improperly, due to their high concentration of carbohydrates and chemical demand for oxygen - COD. Faced with this demand, the objective of the present study was to carry out the bioremediation of cassava and cassava peel aiming at the production of glycohydrolases by two strains of Aspergillus niger, DR02 and AN 400. The tests took place in agitated medium, for 144 hours. The analyzes carried out were: glucose, pH, COD and the enzymes glucoamylase, xylanase and α -amylase. The results obtained showed a maximum COD reduction of 76 and 78% - DR02 and AN 400, respectively. The highest production of enzymes detected during this bioprocess, for the strains of A. niger DR02 and AN 400, were α-amylases (11.78 and 3.64 U/mL), glucoamylases (8.21 and 3.80 U/ml) and xylanases (2.66 and 1.43 U/ml), respectively. In view of the results reported here, it can be inferred that mycoremediation can be an alternative to manage waste from the flour industry, simultaneously generating value-added products that can be used in the food industry.
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