R2A Agar

R2A Agar is used for enumerating heterotrophic organisms in treated potable water, especially in treated potable water.

Principles

Yeast extract provides a source of trace elements and vitamins. Peptone and casamino acids provide nitrogen, vitamins, amino acids, carbon and minerals. Dextrose serves as a carbon source. Soluble starch aids in the recovery of injured organisms by absorbing toxic metabolic by-products. Sodium pyruvate increases the recovery of stressed cells. Potassium phosphate is used to balance the pH and provide phosphate. Magnesium sulfate is a source of divalent cations and sulfate. Agar is the solidifying agent.

3120-60 Technical Data Sheet

BD Difco R2A Agar Technical Data Sheet

Alpha Bio R2A Agar Product Information

R2A agar is the standard medium for enumerating heterotrophic organisms in treated potable water. Low-nutrient formulation with yeast extract, peptone, dextrose, starch, and sodium pyruvate supports recovery of stressed and injured organisms. Essential for municipal water testing, industrial water monitoring, and bottled water QA. Available from Difco, Alpha Biosciences, and BIOKAR in 500g packages. Sign in to your account or contact your sales rep for organizational pricing.

Frequently Asked Questions

What organisms does R2A detect?

Heterotrophic bacteria in treated and potable water that standard rich media would miss.

Why does the formulation include sodium pyruvate?

Sodium pyruvate supports recovery of heat-stressed and chlorine-injured organisms.

Is R2A required for water testing?

Yes, it's the standard method for heterotrophic plate count (HPC) in potable water.