Yeasts and moulds · Selective supplement
Oxytetracycline Supplement – selective supplement for Yeast Glucose Agar
The Oxytetracycline Supplement makes Yeast Glucose Agar selective for yeasts and moulds. It is added to the sterile base after cooling and suppresses the bacteria present in food and dairy samples.
- Antibiotic supplement for yeast glucose agar
- Suppresses bacteria
- 10 vials
How Oxytetracycline Supplement works
Oxytetracycline inhibits Gram-positive and Gram-negative bacteria, while yeasts and moulds grow unaffected. The supplement is reconstituted and added aseptically to the cooled base just before the plates are poured.
Applications and practical notes
Supplements complete media for yeasts and moulds and make them selective against bacteria, as described for example in FDA BAM Chapter 18. Typical applications include:
- Preparation of selective yeast and mould media
- Suppression of bacteria in mixed samples
- Food, dairy and environmental laboratories
- Routine and reference methods
Working with Oxytetracycline Supplement: Follow the reconstitution and volume on the label of your lot and do not reheat the medium after adding the supplement.
Good practice with media and supplements: 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 yeast and mould methods: in the food chain, yeasts and moulds are counted by spread plating on DRBC Agar for products with a water activity above 0.95 according to ISO 21527-1, and on DG18 Agar for drier products according to ISO 21527-2. The FDA BAM Chapter 18 describes similar plate count methods. In pharmaceutical microbiology, the total yeast and mould count (TYMC) and the test for Candida albicans use Sabouraud media according to EP 2.6.12 / 2.6.13 and USP <61> / <62>. COLO.Science offers counting media, identification media, supplements and reference 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.
Oxytetracycline Supplement is supplied by COLO.Science in the pack sizes listed under Ordering information. For larger quantities, regular deliveries or method-specific sets that include Oxytetracycline Supplement, please send us a request. With every delivery of Oxytetracycline Supplement you receive the lot number and expiry date, and on request we send the available documentation for Oxytetracycline Supplement.
Where Oxytetracycline Supplement fits in yeast and mould testing
- Food and feed counts – DRBC Agar for aw > 0.95 (ISO 21527-1) and DG18 Agar for aw ≤ 0.95 (ISO 21527-2); alternatives: Rose Bengal Chloramphenicol, PDA with chloramphenicol, YGC for dairy products
- Pharmaceutical products – Sabouraud Dextrose Agar and Broth for TYMC and the Candida albicans test (EP 2.6.12 / 2.6.13, USP <61> / <62>)
- Cultivation and identification – PDA, Malt Extract and Czapek-Dox Agar for moulds; Corn Meal, chromogenic Candida and BIGGY Agar, Yeast Nitrogen Base for yeasts
- Fermentation and QC – WL Nutrient, Wort Agar and YPD for brewing and culture yeasts; C. albicans and A. brasiliensis reference strains for media testing
See the complete yeast and mould set in the Microbiology Catalogue →
Ordering information
| Product | COLO code | Pack |
|---|---|---|
| Oxytetracycline Supplement for Yeast Glucose Agar | PRO7718 | 10 vials |
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
COLO LabExperts
Polje ob Sotli 4, SI-3255, Slovenia
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.
