Screening of microorganisms secreted high efficient enzymes and properties of enzymatic deinking for old newsprint(IV) - Culture conditions of fungal extracellular enzyme production for biological deinking system

This study was focused on the optimum culture condition in CMCase, FPase and xylanase activities of two fungal strains that secret extracellular enzymes for using enzymatic deinking agent to old newsprint. The results of this study were as follows. When Fusarium pallidoroseum was grown on the medium, containing of rice bran⁺xylan 2.0%, peptone 0.6%, KH₂PO₄ 0.075% and MnSO₄ 0.06% with pH 9.0, at 29 °C for 6 days, the quantitative degree of extracellular enzyme production was the highest. Optimum culture condition for Aspergillus niger was pH 5.0, 27 °C incubating temperature and 7 days incubation period on liquid medium, containing of CMC-xylan 2.5%, yeast extract 0.4%, K₃PO₄ 0.05% and CaCl₂+FeSO₄ 0.08%. Aspergillus niger was fairly higher FPase and xylanase activities than Trichoderma reesei ATCC 28217.