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Acid-alkali stability of recombinant xylanases. To estimate pH stability, the recombinant enzymes were incubated in the different pH buffers (pH range from 2 to 10) at 37°C for 30 min, and then the residual xylanase activity was determined at optimal pH. The activity determined under the standard conditions of optimal pH without incubation was defined as 100% relative activity. Symbols: recombinant XYNA1 (▲); recombinant XYNB (■).
