ESTY MEDIUM - 500 g
Selective medium for the enumeration of Streptococcus thermophilus in yogurt
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Packaging
Suspend 48.30 grams of the medium in 950 ml of distilled water. Mix well and dissolve by heating with frequent agitation. Boil for one minute until complete dissolution. Sterilize in autoclave at 121ºC for 15 minutes. Cool to 45-50ºC and aseptically add 5 grams of lactose (Cat. 1905), previously reconstituted in 50 ml of distilled water. Sterilize lactose solution by membrane filtration. Homogenize gently and dispense into Petri dishes.
Formula