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Delta Journal of Science
β-galactosidase enzyme was isolated from Aspergillus niger, and immobilized in sodium alginate gel. The maximum activity of the free enzyme was obtained at 65 o C, pH 3.5 and its not affected by immobilization. The free enzyme had pH stability range from 3.5 to 6.5 and it was increased by immobilization process especially at acid pH values. The free enzyme retained 90.28, 85.09, 45.49, and 19.2 % of its initial activity after incubation at 30, 40, 50, and 60 o C, for 60 min respectively.doi:10.21608/djs.2013.139571 fatcat:htsmllfvqnaf3d7okzjkoqckz4