Kr. Babu et T. Satyanarayana, ALPHA-AMYLASE PRODUCTION BY THERMOPHILIC BACILLUS-COAGULANS IN SOLID-STATE FERMENTATION, Process biochemistry, 30(4), 1995, pp. 305-309
The production of extracellular, thermostable a-amylase by Bacillus co
agulans B49 was studied in solid state fermentation (SSF). Significant
levels of amylase were produced in wheat bran moistened with tap wate
r [22707 (U/g dry bacterial bran)]/salt solution (25692 U). A marked i
mprovement in enzyme production was achieved by optimization of SSF co
nditions (6700 U). Variations in the phase of a-amylase production and
titres were observed depending on the culture vessels (Flask - 25 000
U at 72 h; reactor - 26350 U at 48 h) and conditions (static 24 24946
U at 72 h; shake flask - 25263 at 48 h). Maximum enzyme production (2
6350 U) was recorded in an aerated reactor. Catabolite repression was
not evident in SSF even at high glucose concentrations. Cultivation in
large trays yielded art enzyme titre of 17515 U at 96 h.