EXERCISE NUMBER XXVIII BACTERIAL COUNTS OF ICE CREAM

This exercise is to be performed once during the course by each student as assigned.

Sterile glassware and media will be furnished you. Weigh or measure the samples for dilution as instructed.

Take samples as indicated below in sterile bottles and plate on plain lactose agar. Incubate at 37 degrees C., for 48 hours.

Sample of cream. Dilutions ¹/₁₀,₀₀₀ and ¹/₁₀₀,₀₀₀.

Sample of gelatin. Dilutions ¹/₁₀ and ¹/₁₀₀.

Sample of vanilla. Dilutions ¹/₁₀.

Sample of sugar. Dilutions ¹/₁₀.

Sample of mix. Dilutions ¹/₁₀,₀₀₀ and ¹/₁₀₀,₀₀₀.

Sample of ice cream from freezer. Dilutions ¹/₁₀,₀₀₀ and ¹/₁₀₀,₀₀₀.

Sample of ice cream after it has remained in the hardening room

one week. Make dilutions of ¹/₁₀,₀₀₀ and ¹/₁₀₀,₀₀₀.

Report results on the blank page opposite.

EXERCISE XXVIII REPORT