Tryptone Water is an alternative medium to Peptone Water and more reliable for the testing of Indole production. The medium has a high content of Tryptophan that many organisms, particularly coliforms, break down to form Indole. After incubation add a few drops of Indole reagent to determine the Indole reaction (Red colour is Positive).
Tryptone Water
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Product Description
| Organisms | Ref. No | Result |
| Escherichia coli | NCTC 12241 | Growth & Indole Positive |
| Enterobacter aerogenes | NCTC 10006 | Growth & Indole Negative |
