“…β-Mannosidases from some organisms also showed similar pH stability in acidic conditions. For example, T. reesei enzyme was stable in a pH range of 3.5-6.0 (Kulminskaya et al, 1999) and A. niger enzyme was stable at pH 4.0-6.0 (Ademark et al, 1999). However, thermal stability of AkMnsd in the acidic pH range was somewhat lower compared with β-mannosidases from A. niger (Bouquelet et al, 1978) and Thermotoga neapolitana 5068 (Duffaud et al, 1997 higher Km values i.e., 1.43 mM and 6.5 mM were determined for other molluscan β-mannosidase from H. pomatia (McCleary, 1983) and A. fulica (Sugahara et al, 1972), respectively.…”