Table 1.
Influence of carbon and nitrogen source on growth and EPS production by Rhizobium sp.
| Carbon/Nitrogen source | Growth (OD 610 nm) | Residual sugar (g l−1) | Viscosity (cP) |
EPS (g l−1) |
|---|---|---|---|---|
| Carbon source (10 g l−1) | ||||
| Mannitol | 0.10 | 8.47 | 32 | 1.20 |
| Sucrose | 0.65 | 0.70 | 114 | 2.47 |
| Dextrose | 1.80 | 7.76 | 45 | 1.50 |
| Fructose | 0.40 | 6.81 | 54 | 1.04 |
| Maltose | 0.20 | 7.14 | 69 | 1.10 |
| Lactose | 0.25 | 8.21 | 78 | 0.30 |
| Sorbitol | 0.45 | 8.51 | 79 | 0.40 |
| Meso-inositol | 0.30 | 8.75 | 48 | 0.20 |
| Nitrogen source (1 g l−1) | ||||
| Sodium nitrate | 0.10 | 9.21 | 25 | 0.01 |
| Urea | 0.10 | 8.86 | 38 | 0.00 |
| Casein | 0.30 | 7.10 | 47 | 0.50 |
| Casein hydrolysate | 0.43 | 6.51 | 71 | 1.10 |
| Ammonium sulphate | 0.90 | 0.44 | 114 | 2.47 |
| Yeast extract | 0.82 | 0.52 | 113 | 2.39 |
| Ammonium phosphate | 0.67 | 0.65 | 90 | 1.50 |