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).
|Shelf Life (days)|
|Storage Temp (°C)|
|Escherichia coli||NCTC 12241||Growth & Indole Positive|
|Enterobacter aerogenes||NCTC 10006||Growth & Indole Negative|