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24 June, 15:24

You count 47 cfu on a spread plate. The plate was prepared by spreading 0.2 ml of a 1:10,000 dilution of the original sample. What is was the concentration of the original culture (in cells/ml) ?

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  1. 24 June, 17:34
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    Answer: 2.35 x 10^6 cfu/ml

    Explanation:

    Concentration of the original culture:?

    Dilution factor: 10^4

    Colony count per plate: 47cfu

    Volume of cultured plate: 0.2ml

    Concentration of the original culture = Colony count per plate x Dilution factor

    Volume of cultured plate

    Concentration of the original culture = 47 x 10^4

    0.2

    Concentration of the original culture = 2.35 x 10^6 cfu/ml

    You can further take the log of your answer which would be:

    Log (2.35 x 10^6) = 6.371
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