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Phenol Red Dextrose Broth is the same as Phenol Red Broth Base (Cat. 1115) with the addition of dextrose for fermentation studies. Casein peptone provides nitrogen, vitamins, minerals and amino acids essential for growth and allows the abundant growth of a wide variety of fastidious microorganisms. Sodium chloride supplies essential electrolytes for transport and osmotic balance. Phenol red is the pH indicador and changes to yellow in acid conditions as a result of bacterial fermentation. Durham tubes trap any gases produced during fermentation. Dextrose is the fermentable carbohydrate providing carbon and energy. Vera recommended using casein peptone in fermentation test media since she found that it could be used with the pH indicator phenol red in fermentation tests with a high degree of accuracy.
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