Table 1.
Influence of carbon and nitrogen source on biomass and activity of glucose isomerase (GI) produced by Aspergillus sp.
| Biomass mg/l | GI unitsm mg/ml | GI activity, U/mg | |
|---|---|---|---|
| Carbon sources, 1 g/l, | |||
| Glucose | 872 ± 1.21 | 1126 ± 1.0 | 1.2 ± 1.01 |
| Sucrose | 752 ± 0.15 | 112 ± 0.07 | 1.0 ± 0.03 |
| Maltose | 726 ± 0.13 | 102 ± 0.06 | 1.0 ± 0.03 |
| Mannitol | 640 ± 0.12 | 90 ± 0.04 | 0.9 ± 0.01 |
| Arabionse | 560 ± 0.11 | 86 ± 0.03 | 0.8 ± 0.01 |
| Xylose | 841 ± 0.85 | 996 ± 0.90 | 1.2 ± 0.80 |
| Starch hydrolysate | 811 ± 0.17 | 52 ± 0.01 | 0.7 ± 0.02 |
| Nitrogen sources, 1 g/l | |||
| Organic nitrogen source | |||
| Yeast extract | 872 ± 1.02 | 1120 ± 1.01 | 1.2 ± 1.10 |
| Peptone | 790 ± 0.15 | 1011 ± 0.90 | 1.1 ± 0.80 |
| Inorganic nitrogen source | |||
| NH4SO4 | 861 ± 0.85 | 1116 ± 0.78 | 1.0 ± 0.81 |
| NH4NO3 | 740 ± 0.13 | 838 ± 0.15 | 0.9 ± 0.06 |
| NH4(PO)4 | 796 ± 0.15 | 876 ± 0.17 | 0.8 ± 0.21 |
| NH4Cl | 702 ± 0.05 | 795 ± 0.22 | 0.6 ± 0.31 |
r2 for effect of carbon source = 0.320, r2 for effect of nitrogen source = 0.629, (n = 3)