3M Petrifilm E. Coli coliform count plates, available from 3M Food Safety (Microbiology) are designed to identify E. coli and other coliforms with one easy test and quick confirmed results.
3M Petrifilm E. Coli coliform count plates offer confirmed results for meat and poultry in just 24 hours and within 48 hours for other foods.
E. Coli can be easily differentiated from other coliforms; a glucuronidase indicator forms a blue precipitate around any E. coli colony that may be present in the food sample.
Testing with 3M Petrifilm E. Coli coliform count plates does not need confirmation of results whereas VRBA and MPN methods require confirmation that might take another 24 hours.
Automated reading is available using Petrifilm plate readers.
It is easy to differentiate coliforms from non-coliforms in 3M Petrifilm E. Coli coliform count plates wherein the combination of red colour and presence of gas easily identifies a colony as a coliform. The VRBA method does not use gas as an indicator.
Offering more precision than the MPN method, 3M Petrifilm E. Coli coliform count plates facilitate direct count that gives smaller confidence intervals.
Additionally, the 3M process is faster than MPN with MPN taking at least 48 hours.