5. Per federal regulations, pasteurized milk must have no more than 2x10 CFU/ml

Question

5. Per federal regulations, pasteurized milk must have no more than 2x10 CFU/ml for it to be sold for consumption as Grade A milk. A quality control technician at Hiland Dairy Foods tests a milk sample after pasteur sample from a dilution tube marked 102. What is the bacterial concentration in the milk sample and st this milk be sold for consumption? SHOW ALL WORK AND USE WRITING YOUR ANSWER. (3 pts) ization using standard bacterial plate counts and observes 89 colonies after plating out 0.5 ml of

Explanation / Answer

89 colonies are found after plating with 0.5 ml of sample from the dilution tube marked 10-2.

No. Of bacteria present in 0.5 ml are 89 x 102.

Or we can say bacterial load is ( 89 x 103) / 5 = 1.78 x 104 cfu/ ml .

According to regulation grade A milk should contain not more than 2 x 104 cfu / ml .

Milk of hiland dairy contain 1.78 x 104 cfu/ ml . So it is a grade A milk. Ideal for consumption .

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