Carbon source 0.1 % 0.5 %
Glucose 103.5 ± 3.6 120.3 ± 5.3
Fructose 57.1 ± 1.3 59.1 ± 4.7
Lactose 16.5 ± 2.6 15.9 ± 3.2
Maltose 16.9 ± 3.4 23.2 ± 5.1
Cellulose 8.2 ± 1.7 10.1 ± 2.3
Nitrogen source 0.1 % 0.5 %
Peptone 102.3 ± 5.3 116.4 ± 4.6
Yeast extract 96.3 ± 2.6 114.4 ± 2.8
Tryptone 62.3 ± 6.1 79.9 ± 3.3
Beef extract 28.9 ± 4.3 36.6 ± 4.1
Casein 5.7 ± 2.1 8.2 ± 2.2
Metal ions 0.5 mM 1.0 mM
Zn2+ 128.3 ± 3.9 141.3 ± 4.7
Mg2+ 96.1 ± 2.1 92.7 ± 2.9
Mn2+ 84.5 ± 3.1 76.23 ± 3.4
Cu2+ 50.7 ± 2.2 46.13 ± 2.7
Table 2: Effect of carbon, nitrogen and metal ions on protease production of B. megaterium PB-4.