Enumeration of beta-glucuronidase-positive E.coli

ISO 16649-2:2008

SKU: 900020 Category:

ISO 16649-2:2008 This part of ISO 16649 specifies a horizontal method for the enumeration of ?-glucuronidase-positive Escherichia coli in products intended for human consumption or for the feeding of animals. It uses a colony-count technique at 44 ?C on a solid medium containing a chromogenic ingredient for detection of the enzyme ?-glucuronidase.
WARNING ? Strains of Escherichia coli which do not grow at 44 ?C and, in particular, those that are ?-glucuronidase negative, such as Escherichia coli O157, will not be detected.