Xylanolytic activity of commercial juice‐processing enzyme preparations

Of 22 commercial juice‐processing enzyme preparations investigated, Clarex ML was found to exhibit the highest xylanase activity. The xylanase from Clarex ML was most active at 50–60°C and pH 5·0–5·5. The Km and Vmax values of the enzyme with oat‐spelt xylan as the substrate were 8·6 mg ml−1 and 42 μmol xylose l−1 min−1, respectively. Xylobiose was the main product of enzymatic hydrolysis of xylan.