Micro December 2018

1

Dry Dog Food

0 0.5 1 1.5 2 2.5 3 3.5 4

yBAM = 0.9728x + 0.0414 R² = 0.9796

3M Petrifilm REC ISO

yREC = 0.9726x + 0.026 R² = 0.9704

LOG 10 REP A CFU/g

0

0.5

1

1.5

2

2.5

3

3.5

4

LOG 10

REP B CFU/g

2 Figure 3: Youden’s Plot for 3M Petrifilm Rapid E. coli /Coliform Count Plate (37 o C) and ISO 4832 3 for Coliform s

4 5 6 7

Dry Dog Food

0 0.5 1 1.5 2 2.5 3 3.5 4

yISO = 0.9878x + 0.0548 R² = 0.9702

3M Petrifilm REC ISO

yREC = 1.0003x + 0.0355 R² = 0.9632

LOG 10 REP A CFU/g

0

0.5

1

1.5

2

2.5

3

3.5

4

LOG 10

REP B CFU/g

8 Figure 4: Youden’s Plot for 3M Petrifilm Rapid E. coli /Coliform Count Plate (37 o C) and ISO 9 16649-2 for E. coli

10 11

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