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Effect of pH on the activity of the recombinant xylanase. The optimal pH was determined by incubating the enzyme at 50 °C for 10 min at different pH. To determine the optimal pH, pH range from 2 to 10 was used with the following (100mM) buffers: KCl-HCl (pH 2), sodium citrate (pH 3–7), Na2HPO4- NaH2PO4 (pH 8.0), glycine -NaOH (pH 9-10). The maximal enzyme activity was defined as 100% relative activity. Symbols: recombinant XYNA1 (▲); recombinant XYNB (■).
