Method & Medium for use in detecting E. coli and total coliforms
US5650290A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 12, 1995 |
| Grant date | Jul 22, 1997 |
| Priority date | — |
| Expiry date | Sep 12, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/849
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
A selective culture medium which permits simultaneous detection of total coliform and Escherichia coli in a test sample with a single growth phase incubation period. The culture medium includes the required components of: (i) carbon nutrients, (ii) a nitrogen nutrient, (iii) a source of metabolizable potassium, (iv) a source of metabolizable phosphate, (v) vitamins, (vi) minerals, (vii) amino acids, (viii) sodium pyruvate, (ix) a bactericidal system selective for non-coliform bacteria, and (x) a sensible indicator selectively metabolized by Escherichia coli to the exclusion of other coliforms; and the optional components of: (xi) a source of metabolizable magnesium, (xii) sodium chloride as a recovery agent, (xii) a nonionic surfactant, (xiii) a contrast promoter effective for enhancing the color differentiation between Escherichia coli colonies growing in the medium and other bacterial colonies growing in the medium induced by the sensible indicator, and (xiv) a highlighting dye for enhancing the visual differentiation of coliform colonies relative to the culture medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.