3.1.2. Effect of pH on activity and stability of crude proteases
The activity of the crude enzyme was determined at differentpH values (5.0–12.0). As shown in Fig. 2a, two activity peakswere observed at pH 6.0 and 10.0. The enzyme preparation washighly active between pH 8.0 and 11.0, with an optimum at pH10.0. The relative activities at pH 9.0, 11.0, and 12.0 were about94%, 69%, and 39%, respectively, of that at pH 10.0. The opti-mum pH of S. scrofa proteases was similar to those of Colossomamacropomum proteases (Esposito et al., 2009a) and Lithognathusmormyrus proteases (El Hadj-Ali et al., 2011).The pH stability profiles, reported in Fig. 2b, showed thatthe crude enzyme extract is highly stable over a wide broadpH range, maintaining more than 90% of its original activitybetween pH 6.0 and 11.0, and more than 80% at pH 5.0 and pH12.0 after 1 h incubation at 4◦C. The crude enzyme was highlystable even after incubation for 24 h.The above results suggest that the viscera of red scorpi-onfish would be a potential source of alkaline proteases forcertain industrial applications that require high alkaline con-ditions.
3.1.2. Effect of pH on activity and stability of crude proteasesThe activity of the crude enzyme was determined at differentpH values (5.0–12.0). As shown in Fig. 2a, two activity peakswere observed at pH 6.0 and 10.0. The enzyme preparation washighly active between pH 8.0 and 11.0, with an optimum at pH10.0. The relative activities at pH 9.0, 11.0, and 12.0 were about94%, 69%, and 39%, respectively, of that at pH 10.0. The opti-mum pH of S. scrofa proteases was similar to those of Colossomamacropomum proteases (Esposito et al., 2009a) and Lithognathusmormyrus proteases (El Hadj-Ali et al., 2011).The pH stability profiles, reported in Fig. 2b, showed thatthe crude enzyme extract is highly stable over a wide broadpH range, maintaining more than 90% of its original activitybetween pH 6.0 and 11.0, and more than 80% at pH 5.0 and pH12.0 after 1 h incubation at 4◦C. The crude enzyme was highlystable even after incubation for 24 h.The above results suggest that the viscera of red scorpi-onfish would be a potential source of alkaline proteases forcertain industrial applications that require high alkaline con-ditions.
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