Maximum amylase activity from
Bacillus sp.GM8901 with optimum pH 11.0 to 12.0 was reported by Kimet al.
(1995).Similarly,Yanget al. (2011) reportedthat the recombinant alkaline α-amylase from Bacillus alcalophilus in Bacillus subtilis was stable at pH from7.0 to 11.0 with an optimum pH of 9.5.