Fig. 3

Effect of pH on the activity (a) and stability (b) of xylanase from KBFB4 and VSDB5. The optimal pH for xylanase activity was measured at 50 °C for 30 min in different buffer systems, namely, citrate phosphate (100 mM, pH 3 to 8) and glycine (100 mM, pH 8 to 10). The pH stability was determined by incubating the enzymes at various pH values for 30 min, followed by enzyme assay. The maximum activity was expressed as the activity maxima 100%. The KBFB4 and VSDB5 are represented by filled circles (green) and filled squares (red), respectively. The standard deviation was not more than 10% from the mean