3M Petrifilm high sensitivity coliform count plates available from 3M Food Safety (Microbiology) are especially suitable for milk testing and can offer sensitivities as high as one organism per gram.
3M Petrifilm high sensitivity coliform count plates can achieve equivalent or better sensitivities as commonly used MPN methods while offering all the advantages of Petrifilm.
Ideal for milk testing applications, the user can plate milk samples to achieve <0.2 cfu/g sensitivity.
3M Petrifilm high sensitivity coliform count plates offer 24-hour result for both positives and negatives with confirmation required.
The VRBA and MPN methods require confirmation that may take another 24 hours.
It is easy to differentiate coliforms from non-coliforms in Petrifilm high sensitivity 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, Petrifilm high sensitivity 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.