R2A Liquid Medium

R2A Liquid Medium

R2A, also known as Medium S, was developed by Reasoner and Geldreich. R2A is a low-nutrient medium used for the microbiological plate count of treated drinking water. The medium allows for the recovery of damaged and chlorine-tolerant bacteria without being overshadowed by rapidly growing microorganisms. R2A achieves this requirement by combining extended incubation times and low incubation temperatures (optional), yielding significantly higher recovery rates for fatigued microbes. Acid-hydrolyzed casein and peptone provide nitrogen, vitamins, amino acids, carbon, and minerals. Yeast extract provides vitamins and essential trace elements; soluble starch can adsorb toxic metabolic byproducts, benefiting the recovery of damaged microorganisms; sodium pyruvate aids the recovery of stressed cells; magnesium sulfate provides divalent cations and sulfur; and potassium phosphate is a phosphorus source that can also buffer the pH of the medium.

1. This product is for scientific research use only. Please do not use it for medical, clinical diagnosis or treatment, food and cosmetics, etc. Please not store it in a general residential area.

2. For your safety and health, please wear a lab coat and disposable gloves and masks when operating.

3. The experimental can be affected by a variety of factors, and the relevant treatment is limited to the product itself, and does not involve other compensation.