Carbon source | |||||
Control | Glucose | Sucrose | Maltose | Lactose | |
GABA (g/L) | 0.46 ± 0.03 | 4.74 ± 0.03 | 2.4 ± 0.02 | 1.37 ± 0.02 | 3.96 ± 0.03 |
Concentration of glucose (%) | |||||
Control | 0.5 | 1 | 1.5 | 2 | |
GABA (g/L) | 0.42 ± 0.02 | 3.97 ± 0.02 | 4.74 ± 0.03 | 2.43 ± 0.03 | 0.79 ± 0.04 |
Viable count (log cfu/ml) | 1.2 ± 0.03 | 4.73 ± 0.05 | 6.26 ± 0.1 | 5.33 ± 0 | 3.8 ± 0 |
pH | 4.9 ± 0.3 | 4.5 ± 0.6 | 4.5 ± 0.2 | 4.3 ± 0.5 | 4.4 ± 0.5 |
Concentration of MSG (monosodium glutamate (%)) | |||||
Control | 1 | 2 | 3 | 4 | |
GABA (g/L) | 0.45 ± 0.02 | 4.46 ± 0.05 | 4.21 ± 0.01 | 4.01 ± 0.03 | 3.74 ± 0.03 |
Viable count (log cfu/ml) | 1.1 ± 0.01 | 6.8 ± 0.4 | 6.2 ± 0.5 | 5.3 ± 0.4 | 4.8 ± 0.4 |
pH | 4.7 ± 0.4 | 4.4 ± 0.5 | 4.4 ± 0 | 4.4 ± 0 | 4.4 ± 0 |
Temperature (°C) | |||||
Control (37) | 25 | 30 | 35 | 40 | |
GABA (g/L) | 4.2 ± 0.04 | 2.83 ± 0.2 | 3.31 ± 0.2 | 4.01 ± 0.03 | 3.86 ± 0.1 |
Viable count (log cfu/ml) | 6.1 ± 0.3 | 4.0 ± 0.5 | 4.5 ± 0.2 | 5.5 ± 0.3 | 4.2 ± 0.1 |
pH | 4.4 ± 0 | 4.4 ± 0.5 | 4.4 ± 0 | 4.4 ± 0 | 4.4 ± 0 |
pH | |||||
Control | 4 | 5 | 6 | 7 | |
GABA (g/L) | 0.38 ± 0.02 | 2.35 ± 0.02 | 2.58 ± 0.04 | 2.59 ± 0.03 | 1.46 ± 0.1 |
Viable count (log cfu/ml) | 0.8 ± 0.02 | 2.1 ± 0 | 4.3 ± 0.2 | 1.4 ± 0.1 | 1.1 ± 0.1 |
pH | 5.2 ± 0 | 3.1 ± 0 | 3.4 ± 0 | 3.4 ± 0 | 4.1 ± 0 |
Incubation period (no. of days) | |||||
Control | 1 | 2 | 3 | 4 | |
GABA (g/L) | 0.48 ± 0.02 | 4.02 ± 0.01 | 4.27 ± 0.02 | 1.18 ± 0.02 | 0.86 ± 0.02 |
Viable count (log cfu/ml) | 1.0 ± 0.02 | 6.7 ± 0.05 | 6.9 ± 0.02 | 4.8 ± 0.04 | 3.74 ± 0.06 |
pH | 4.9 ± 0 | 4.4 ± 0 | 4.4 ± 0.1 | 4.4 ± 0.05 | 4.2 ± 0 |
Inoculum size (%) | |||||
Control | 1 | 2 | 3 | 4 | |
GABA (g/L) | 0.43 ± 0.04 | 3.79 ± 0.01 | 3.71 ± 0.05 | 2.62 ± 0.05 | 2.12 ± 0.04 |
Viable count (log cfu/ml) | 1.2 ± 0.02 | 5.8 ± 0.3 | 6.4 ± 0.4 | TNC | TNC |
pH | 5 ± 0 | 4.4 ± 0 | 4.4 ± 0 | 4.4 ± 0 | 4.4 ± 0 |