Coliforms and E. coli · Confirmation · granulated
Brilliant Green Lactose Bile Broth – granulated confirmation broth
The granulated Brilliant Green Lactose Bile Broth is used like the powder, as the confirmation broth for coliforms after the presumptive LST test. The granules reduce dust when weighing and dissolve evenly.
- Granulated – cleaner weighing
- Confirmation of coliforms in the MPN method
- Gas in Durham tube = positive
How Brilliant Green Lactose Bile Broth works
Bile and brilliant green inhibit the accompanying flora, while coliforms ferment lactose with gas. Gas that fills at least one tenth to one third of the Durham tube, depending on the method, confirms coliforms.
Typical reactions
| Organism | Reaction |
| Coliforms | Turbidity, gas at least 1/3 of the Durham tube |
| Enterococcus faecalis | No gas |
Technical data
| Preparation | 40 g/L; boil with stirring until dissolved; dispense into tubes with Durham tubes; autoclave 121°C 15 min |
| Final pH | 7.2±0.2 |
| Incubation | 35-37°C for 24 h |
| Storage | Dry, dark place; keep the container tightly closed |
| Shelf life | 3 years |
Applications and practical notes
In the multiple-tube (MPN) method for coliforms and E. coli, as described in FDA BAM Chapter 4 and ISO 4831, a presumptive broth is followed by confirmation broths. Typical applications include:
- Coliform and E. coli MPN counts in food and feed
- Testing of water, ice and beverages
- Hygiene monitoring in dairy, meat and ready-to-eat production
- Verification of media and methods with reference strains
Working with Brilliant Green Lactose Bile Broth: Dispense into tubes with Durham tubes before sterilisation and check that the tubes are completely filled with medium afterwards.
Good practice with dehydrated media: keep the bottle tightly closed in a cool, dry place, weigh the powder quickly to avoid moisture uptake, and use fresh distilled or deionised water. Check the pH of each new batch after preparation and before use, and label prepared media with the date. Performance of each lot can be verified with reference strains according to ISO 11133, the standard for the preparation, production, storage and performance testing of culture media.
About coliform and E. coli methods: coliforms and E. coli are counted either by the multiple-tube (MPN) method, with a presumptive broth followed by confirmation broths, or by colony counts on selective agars. FDA BAM Chapter 4 describes both approaches for food and water, and ISO 16649-2 gives the colony-count method for β-glucuronidase-positive E. coli on TBX Agar. E. coli O157 and other STEC need dedicated media, serology and PCR. COLO.Science offers media, supplements, rapid tests, identification kits and QC strains for every step.
Complete sets from one supplier: COLO.Science supplies culture media, supplements, rapid tests, identification kits and QC strains as complete sets for the method you follow. Send us your sample types and standards, and we will prepare an offer with the matching products and documentation.
Brilliant Green Lactose Bile Broth is supplied by COLO.Science in the pack sizes listed under Ordering information. For larger quantities, regular deliveries or method-specific sets that include Brilliant Green Lactose Bile Broth, please send us a request. With every delivery of Brilliant Green Lactose Bile Broth you receive the lot number and expiry date, and on request we send the available documentation for Brilliant Green Lactose Bile Broth.
Where Brilliant Green Lactose Bile Broth fits in coliform and E. coli testing
- Presumptive test – Lauryl Sulfate Tryptose Broth (MPN) or VRBL / chromogenic agar (colony count)
- Confirmation – BGLB Broth for coliforms; EC or EC-MUG Broth at 44.5 °C for E. coli
- Isolation – EMB, MacConkey, TBX or chromogenic E. coli agar
- Identification – IMViC kit; for O157 and STEC: SMAC or chromogenic O157 agar, latex and PCR
Ordering information
| Product | COLO code | Pack |
|---|---|---|
| Brilliant Green Lactose Bile Broth (BGLB), granulated | PRO7616 | 250 g |
Product notice: preparation, storage conditions and shelf life are given on the label. Technical data on this page are for orientation; the label and the lot documentation apply. B2B prices are quoted net, excluding VAT.
Sales and technical support
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Quotations and technical support for culture media and microbiology products across our international sales territory. B2B prices are net, excluding VAT.
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Need the complete set for your method?
Send the sample type, target organism and the standard you follow. COLO.Science will put together the media, supplements, QC strains and confirmation tests for the whole procedure.
