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pH stability of the κ-carrageenase from Cellulophaga lytica strain N5-2. The different pH buffer was: Na2HPO4-Citric acid buffer (pH 4.0–7.0), Tris-HCl buffer (pH 8.0 and 9.0) and glycine-NaOH buffer (pH 10.0). Pre-incubating the enzyme solution at each pH (4.0–10.0) at 35 °C for 6 h and then the enzyme activity was determined in the same pH buffer. The activity of untreated enzyme was regarded as 100% and relative activity was determined.
