PRODUCTION OF BACTERIAL ENZYMES BY SOLID-STATE FERMENTATION

A consolidated information on the production of extracellular enzymes in SSF by bacteria is provided. It is pointed out that the cultures us ed for the production of thermostable alpha-amylase in SSF are chiefly limited to the genus Bacillus. The effect of the nature of a substrat e on SSF is discussed. It is reported that wheat bran has been found t o be the best and most suitable for necessary manipulations for the pr oduction of alpha-amylase. Various other substrates used in SSF are me ntioned. The effect of moisture level and inoculum level on enzyme pro duction is discussed. Mention is also made of catabolite repression an d various reactors used in SSF. It is concluded that certain bacterial strains are amenable for cultivation in SSF for the production of ext racellular enzymes like proteases and xylanases besides alpha-amylase.