Table 6.
Effect of different metabolic precursors on the production of γ-PGA.
| Strain | Metabolic precursor | γ-PGA (g/L) | Remarks | Reference |
|---|---|---|---|---|
| B. licheniformis ATCC 9945 | Glutamic acid, citric acid | 23.00 | Utilized citrate rapidly at pH 6.5 which translated in to increased PGA production. | 27 |
| B. subtilis R 23 | Glutamic acid, citric acid (Fed batch) | 35.00 | Pulsed-feeding of citric acid (1.44 g/L/h) and L-glutamic acid (2.4 g/L/h) when citric acid was depleted. | 28 |
| Glutamic acid, citric acid, α-ketoglutaric acid | 25.38 | Addition of α-ketoglutaric acid to the medium increased yield as well as molecular of PGA. | 29 | |
| B. licheniformis NCIM 2324 | Glutamic acid, citric acid, α-ketoglutaric acid, glutamine | 35.75 | Addition of α-ketoglutaric acid and glutamine to the medium increased yield as well as molecular of PGA. | 30 |
| B. subtilis Z15 | CEGA, aspartic acid, phenylalanine | 42.92 | Crude extract of glutamic acid after isoelectric crystallization (CEGA) could be a replacement for glutamate for γ-PGA production. | This study |