Petri films - record the results in MPN/gram or CFU/gram?

hey guys,

Just curious...when using the 3M petri film method, do I need to record the results in MPN/gram or CFU/gram?

Thanks :):)

When I used to do lab, petrifilm results are always reported in cfu/g sample.

Thought so.

thank you majoy :)

3M has some high quality information on the use and interpretation of the petrifilm plates.  I use them in all our micro plating SOP's with petrifilm plating.  There is one for each specific type of petrifilm.

https://www.3m.com/3...294857497&rt=r3

hey guys,

 

Just curious...when using the 3M petri film method, do I need to record the results in MPN/gram or CFU/gram?

 

Thanks :):)

It directly relates to the specific Procedure.

And the Procedure directly relates to the specific Objective.

MPN Procedures are often invoked where the level of target species is Low, typically <100 cfu/gram. Originally developed for micro (indicator) evaluation of water supplies.