Table 1.
Comparison of γ-PGA production and productivity among different strains
| Strain | Main nutrients | Fermentation process | Production (g/L) | Productivity (g/L/h) | References |
|---|---|---|---|---|---|
| B. subtilis 2756 | l-glutamic acid, sago, yeast extract | Flasks | 39.8 | 0.415 | [15] |
| B. subtilis NX-2 | Glucose, l-glutamic acid, yeast extract, | Fed-batch fermentation (7.5L fermentor) | 73.0 | 0.81 | [14] |
| B. subtilis SCP010–1 | Corncob hydrolysate, monosodium glutamate, yeast extract | Fed-batch fermentation (2L flask) | 30.035 | 0.601 | [16] |
| B. subtilis 242 | Cane molasses, l-glutamic, corn steep liquor | Fed-batch fermentation (5L fermentor) | 32.14 | 0.67 | [20] |
| B. siamensis IR10 | l-glutamic acid, molasses, NH4Cl | Fed‑batch and repeated fed‑batch fermentation (3L fermentor)) | 41.4–45.42 | 1.67–2.02 | [19] |
| B. siamensis SB1001 | Sucrose, l-glutamic acid | 250 ml flasks | 25.22 | 1.05 | [31] |
| B. licheniformis WX-02 | Glycerol, sodium glutamate, NaNO3, citric acid | Fed-batch fermentation (5L fermentor) | 36.83 | 0.767 | [26] |
| B. licheniformis CGMCC NO. 23967 | Monosodium glutamate, sugarcane molasses, yeast extract | Batch fermentation (5L fermentor) | 76.848 | 1.07 | This work |