Illustrative image only. Actual product may vary.R-2A Broth
Also known as：R2A Broth · Reasoner's 2A Broth · Reasoner 2A Broth · R2A Medium
- Category
- Dehydrated Culture Media
- Dissolve per litre
- 3.15 g
- Pack sizes
- 500 g · 5 kg · 25 kg
Data updated：2026-11-06
Overview
R-2A Broth is a broth (liquid) medium, a standard general-purpose and enumeration formulation. It is a low-nutrient medium favouring slow growers, used for heterotrophic plate counts of drinking and purified water. STBIO manufactures it from food-grade raw materials in an ISO 22000 certified facility, with a COA for every batch.
Choosing a general-purpose or enumeration medium
Plate Count Agar is used for total viable counts in food, water, and environmental samples. Nutrient Broth and Tryptic Soy media are the general-purpose choices for non-fastidious bacteria, with the latter richer and also used for sterility testing and environmental monitoring. Brain Heart Infusion is the richest of the three and suits fastidious organisms such as streptococci. Use the agar form for enumeration and the broth for propagation.
Product highlights
- Manufactured to the standard formulation, 3.15 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
Frequently asked questions
01Which medium should I use for total viable counts?
Total viable counts in food and water normally use Plate Count Agar with the pour-plate method at 30 °C. Follow the incubation conditions specified by the method you are working to.
02How much powder per litre?
Use 3.15 g per litre of deionised water; preparation and sterilisation conditions are given on the specification sheet.
03Is there a Halal certified version of this product?
Yes. This is the standard version; a Halal certified version is also produced from food-grade raw materials with Halal documentation, for compliant sourcing in Malaysia, Indonesia, and the Middle East.
04How 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.
Used in these applications
- Cleanroom and production environment monitoringMedia for settle plates, contact plates, and surface sampling
- Total plate countRoutine QC of food, drinking water, and environmental samples
- Semiconductor wastewater biotreatment: media and nitrogen sources for nitrifiers, TMAH degraders and sludge acclimationStandard media and industrial nitrogen sources for culturing bioaugmentation strains and starting or re-seeding biological treatment tanks
- Cleanroom and ultrapure water microbial monitoring: settle plates, surfaces and water systemsStandard media for ISO 14698, USP <1231> and USP <61> monitoring