Escherichia coli form purple to indigo colonies, and coliforms other than Escherichia coli form blue to turquoise colonies by chromogenic substrate for enzyme.
Counting purple to indigo and blue to turquoise colonies gives the number of coliform, and counting purple to indigo colonies gives the number of Escherichia coli.
This product can be used as an alternative to ISO 4832 (coliform) and ISO 16649-2 (Escherichia coli).
Culture condition |
35 ± 1 °C, 24 hours |
|---|---|
Colony |
Escherichia coli : purple to indigo coliforms other than Escherichia coli : blue to turquoise |
Measurement range |
≤300 colonies/sheet |
Warranty period |
1.5 years after manufacture (unopened aluminum pouch) |
Storage conditions |
Refrigerate required (2-15 °C) |
International certification |
MicroVal No. 2017LR71、AOAC-PTM No. 011902 |