Rapid coliform detection system
US6511819B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2001 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Mar 29, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S435/968
- WIPO fieldBiotechnology
- WIPO sectorChemistry
Abstract
A rapid method for detecting the presence or absence of coliform bacteria in a liquid or liquified dairy sample, for example, skimmed milk, lowfat milk, or whole milk. A growth medium containing a fluorogenic substrate is combined with the dairy sample and is incubated for a brief period of time, for example for about 4 hours, after which a first fluorescence value of 4-methylumbelliferone is measured. The dairy sample is incubated again for about 2-8 hours after which a second fluorescence value of 4-methylumbelliferone is measured. Total, fecal, or thermotolerant coliform bacteria are determined to be present in the sample if the second fluorescent value exceeds the first fluorescent value by a predetermined 4-methylumbelliferone concentration threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.