SUSTAINABILITY IN FOOD TECHNOLOGY
SUSTAINABLE FOOD PACKAGING
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The total plate count of a milk sample is 2.34×106 CFU/mL. What final dilution factor would yield a countable plate?(Countable range:30-300 colonies; volume plated:1 mL)
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104
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10-4
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105
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10-5
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10-4 and 10-5
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Explanation:
Detailed explanation-1: -If there is one colony on the plate and 1ml was plated, the result is 10 CFU/ml. If 100ul were plated the result would be 100 CFU/ml. If there are five colonies on the plate, the count is 50 CFU (or 50 CFU/ml if 1ml is plated). Because there can’t be between 0 and 1 colony, the minimum countable result is 10 cfu.
Detailed explanation-2: -CFU/100 mL = (# of colonies counted ÷ sample volume filtered in mL) x 100 (CFU = colony forming units).
There is 1 question to complete.