[Comparative study of the physico-chemical properties of peptones used to the production of dry alkaline agar for cholera diagnosis].

The authors present the results of chemical and physico-chemical study of dry peptones (made in the USSR) used in the production of dry alkaline nutrient agar for the diagnosis of cholera, in comparison with peptones used for other purposes. The batches and types of peptones studied differed by the fractional peptide composition and by the physico-chemical characteristics. Positive results were obtained in the biological test in using peptones with marked hydrolysis with the amine nitrogen content of not less than 200--230 mg%, with an elution curve approaching the Hottinger's peptone curve, well soluble in buffer phosphate solution at 5% concentration.