Microbiology of food and animal feeding stuffs — Horizontal method for the enumeration of _-glucuronidase-positive Escherichia coli — Part 2: Colony-count technique at 44 °C using 5-bromo-4-chloro-3-indolyl _-D-glucuronide

رقم المستند: NL ISO 16649 2 : 2011
القطاع: Food Technology
TC: NL TC 34 SC 4
ICS: 07.100.30
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.