Table 3.

Effect of carbon sources on protease production by B. circulans MTCC 7942.

Carbon source (1%)#	Protease activity (U/mL ± SD)	Specific activity (U/mg ± SD)
Control	201.3 ± 10	621.6 ± 79
Xylose	223.3 ± 13	665.7 ± 58
Fructose	265.9 ± 10	940 ± 80
Sucrose	359.2 ± 7	1033 ± 32
Molasses	379.5 ± 8	1077 ± 43
Maltose	394.2 ± 4	1144 ± 22
Glucose	394.8 ± 8	1158 ± 42
Starch	406.6 ± 5	1205 ± 43

^#Basal medium containing (g/L): soybean meal, 10; KH₂PO₄, 1; MgSO₄·7H₂O, 0.05; CaCl₂, 1; Na₂CO₃, 8, and cultural parameters (pH 10.0) at 37°C and 100 rpm.