Tergitol-7 TTC Medium (without Membrane Filter) is supplied by HiMedia. It is a ready prepared media containing a light yellow to slightly greenish coloured dry filter membrane pad of 50mm diameter. Tergitol-7 TTC Medium is generally used for the detection and enumeration of E. coli and coliforms. It is advisable to store this ready prepared media between 10-30C.

DriFilter Membrane Nutrient Pad Medium is a ready to use sterile culture media. It is available in the form of a 50 mm biological inert absorbent pads soaked with Standard Plate Count Medium medium, then dried and sterilized in 55 mm petri plate. They obliterate the need of arduous media preparation and autoclaving procedures. The nutrient pads just need to be re-wetted with sterile distilled water prior to use. These nutrient pads allow larger sample volumes to be tested at a time. Interpretation of results can be directly done by counting the CFUs and by quantifying the microbial load present in the sample. Tergitol-7 Broth was initially designed by Chapman and later modified by adding 2,3,5-Triphenyl Tetrazolium Chloride (TTC) into the medium. This is a selective and differential medium used for the detection and enumeration of coliform organisms. Sodium heptadecyl sulphate (Tergitol-7) prevents growth of gram-positive bacteria and Proteus swarming, leading to better recovery of coliforms. Bromo thymol blue is used as the pH indicator. Lactose fermenting organisms form yellow coloured medium while Klebsiella and Enterobacter form greenish yellow coloured medium. Lactose non-fermenters make the medium blue. TTC is reduced in the bacterial cell to form formazan, a red coloured insoluble complex thereby producing red coloured medium.