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Total Bacterial Count in Raw Milk Using the BactoScan 8000



Total Bacterial Count in Raw Milk Using the BactoScan 8000



Journal of AOAC International 76(4): 838-841



The BactoScan 8000 (Foss Electric) automatically performs a total count of bacteria in raw milk. It was designed for fast, repeatable counting. The apparatus counts the individual bacteria (IBC) instead of colony forming units (CFU). IBC provides more information on the state of milk hygiene than the CFU count. The repeatability, s-r, was 0.033 log (IBC/mu-L), which is equivalent to a coefficient of variation of 7.9% (IBC/mu-L). The carryover, which is the contamination one sample imposes on the next, was 0.19%. The BactoScan 8000 was calibrated against the reference method of counting colonies on a Petri dish. The correlation coefficient for 429 milk samples was r = 0.88, and the standard deviation of the residuals, S-yx, was 0.259. The detection limit was 15 CFU/mu-L. We recommend establishing a system of payment to farmers based on the bacteriological quality of their milk as determined by the BactoScan 8000. Because results are obtained in IBC/mu-L, analytical differences resulting from conversion to CFU/mu-L are eliminated.

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