Table 4.
Comparison of γ-PGA production and productivity in the fermentor
| Strain | Key nutrients | Fermentation process | Production (g/L) | Productivity (g/L/h) | References |
|---|---|---|---|---|---|
| B. licheniformis NCIM 2324 | l-Glutamic acid, citric acid, sugarcane juice, NH4Cl | Membrane-integrated hybrid reactor system (30 L), continuous feed fermentation | 36.5 | 0.91 | [49] |
| B. licheniformis P-104 | Sodium glutamate, glucose, sodium citrate,(NH4)2SO4 | Fed-batch fermentation (7 L) | 41.6 | 1.07 | [50] |
| B. subtilis NX-2 | Glutamate, glucose, (NH4)2SO4 | Aerobic plant fibrous-bed bioreactor (7.5 L), repeated fed-batch fermentation | 71.21 | 1.246 | [40] |
| B. subtilis BL53 | Glutamic acid, citric acid, glycerol, NH4Cl | Bioreactor (5 L) with oxygen carrier, batch fermentation | 23.5 | 0.98 | [42] |
| B. subtilis NX-2 | Glutamate, glucose, (NH4)2SO4 | Moving bed biofilm reactor (7.5 L), repeated fed-batch fermentation | 74.2 | 1.24 | [43] |
| B. siamensis IR10 | l-Glutamic acid, molasses, NH4Cl | Fed-batch and repeated fed-batch fermentation (3 L) | 41.4–45.42 | 1.67–2.02 | This work |