Koser Citrate Medium
Also known as：Koser's Citrate Medium · Koser Citrate Broth · Citrate Utilization Medium · Koser Medium
Koser Citrate Medium is used to differentiate Escherichia coli from Enterobacter aerogenes based on citrate utilization.
- Category
- Dehydrated Culture Media
- Dissolve per litre
- 5.7 g
- Pack sizes
- 500 g · 5 kg · 25 kg
- Certifications
- Halal
Data updated：2026-11-06
Overview
Koser Citrate Medium is the liquid form of the citrate utilisation test: sodium citrate is the sole carbon source and there is no indicator, so growth that turns the clear broth turbid is read as positive. The Taiwan FDA E. coli method specifies it for the citrate test in IMViC identification (E. coli negative), as does the FDA BAM. The prepared broth must be clear, and the inoculum kept small to avoid carrying over other carbon sources. Food-grade raw materials, Halal certified.
What biochemical identification media are for
Biochemical identification media reveal whether a strain can use a particular substrate, read through colour change, gas production, or a zone of clearing. They remain the basis of conventional identification and confirmatory quality control. Each medium covers one characteristic, so several are normally read together alongside known positive and negative control strains.
Product highlights
- Halal certified, suitable for the Malaysian, Indonesian, and Middle Eastern markets
- Manufactured to the standard formulation, 5.7 g per litre
- Available in 500 g / 5 kg / 25 kg, from laboratory to industrial scale
- COA, specification sheet, and technical data sheet available; samples on request
- Manufactured in Taiwan with reliable supply
FDA BAM methods
This product corresponds to a medium used in the chapters of the US FDA Bacteriological Analytical Manual (BAM), the reference methods for FDA regulatory testing. Follow the current online edition of each chapter.
- FDA BAM Chapter 4: Enumeration of Escherichia coli and the Coliform BacteriaBAM Chapter 4Confirmation / biochemicalNamed in the method as：Koser's citrate broth
BAM specifies methods and media formulations; it does not certify brands. Add supplements as the chapter requires, and verify media against reference strains under your quality system.
Frequently asked questions
01Does this medium meet FDA BAM methods?
BAM specifies methods and formulations, not brands. This product corresponds to a medium used in: FDA BAM Chapter 4: Enumeration of Escherichia coli and the Coliform Bacteria（BAM Chapter 4）: Confirmation / biochemical. It is manufactured to the standard formulation and ships with a COA per batch; add supplements as the chapter requires and follow the current online edition.
02How much powder per litre?
Use 5.7 g per litre of deionised water; preparation and sterilisation conditions are given on the specification sheet.
03How do I request a bulk quotation, and can you provide a COA?
Yes. This product is available in 500 g, 5 kg, 25 kg. Tell us your application and volume when requesting a quotation; we reply within one working day and can supply the COA, specification sheet, and technical data sheet.
Further reading
- FDA BAM Culture Media Cross-Reference: Which Media Each BAM Chapter Uses and the STBIO EquivalentAerobic plate count, coliforms and E. coli, Salmonella, Listeria monocytogenes, Staphylococcus aureus, Bacillus cereus, Vibrio, Clostridium perfringens, yeasts and moulds and Cronobacter: the media named in each FDA Bacteriological Analytical Manual chapter, matched to Taiwan-made dehydrated media for US laboratories qualifying a second source.
- Which Culture Media Do Taiwan FDA Food Microbiology Methods Specify? Cross-Reference for 21 Announced MethodsAerobic plate count, coliforms, E. coli, Enterobacteriaceae, Salmonella, Staphylococcus aureus, Listeria monocytogenes, lactic acid bacteria, yeasts and moulds, Bacillus cereus, Vibrio parahaemolyticus, Clostridium perfringens and Cronobacter: the media named in each Taiwan FDA (TFDA) announced method, matched to Taiwan-made products.