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Absorbance of culture solution after color reaction (n = 3)
| Group | OD530 |
|---|---|
| Sterile water | 0.04 ± 0.00 |
| King’s B broth without added L-tryptophan | 0.06 ± 0.00 |
| King’s B broth supplemented with L-tryptophan | 0.08 ± 0.00 |
| King’s B broth without added L-tryptophan and inoculated with P6 | 0.46 ± 0.04 |
| King’s B broth supplemented with L-tryptophan and inoculated with P6 | 0.53 ± 0.06 |
