Thermoactinomyces thalpophilus produced a raw-starch digesting amylase (RSDA) when grown on both cereal and tuber starches. Glucose, maltose and glycerol repressed enzyme production. Highest activity was recorded on rice starch (39 U ml(-1)). Considerable variability existed in the effectiveness of nitrogenous nutrients to stimulate expression of RSDA. Multiple pH optima for RSDA production and activity suggests enzyme heterogeneity.
World Journal of Microbiology and Biotechnology 11/1996; 12(6):637-8. DOI:10.1007/BF00327728