Table 1 Most probable number (MPN) values per 10Â ml of sample and 95% confidence limits for various combination for the 35 food samples at 0.1, 0.01 and 0.001Â g/ml dilutions
Samples | No.of tubes giving positive reaction at dilutions (g/ml) | MPN Index per (ml) | Confidence 95% limits | |||
|---|---|---|---|---|---|---|
0.1 | 0.01 | 0.001 | Â | Lower | High | |
C1 | 3 | 2 | 1 | 150 | 37 | 420 |
C2 | 1 | 0 | 0 | 3.6 | 0.17 | 18 |
C3 | 2 | 1 | 0 | 15 | 3.7 | 42 |
C4 | 2 | 3 | 1 | 36 | 8.7 | 94 |
C5 | 1 | 0 | 0 | 3.6 | 0.17 | 18 |
C6 | 3 | 3 | 2 | 1100 | 180 | 4100 |
C7 | 3 | 3 | 3 |  > 1100 | 420 | --- |
C8 | 3 | 2 | 1 | 150 | 37 | 420 |
C9 | 3 | 1 | 0 | 43 | 9.0 | 180 |
C10 | 3 | 3 | 0 | 240 | 42 | 1000 |
C11 | 1 | 0 | 0 | 3.6 | 0.17 | 18 |
C12 | 1 | 1 | 0 | 7.4 | 1.3 | 20 |
C13 | 3 | 0 | 0 | 23 | 4.6 | 94 |
C14 | 2 | 2 | 1 | 28 | 8.7 | 94 |
C15 | 1 | 1 | 0 | 7.4 | 1.3 | 20 |
L1 | 3 | 3 | 3 |  > 1100 | 420 | --- |
L2 | 0 | 0 | 0 |  < 0.3 | --- | 0.95 |
L3 | 3 | 1 | 1 | 75 | 17 | 200 |
L4 | 2 | 3 | 1 | 36 | 8.7 | 94 |
L5 | 3- | 2 | 0 | 93 | 18 | 420 |
L6 | 2 | 2 | 0 | 21 | 4.5 | 42 |
L7 | 3 | 3 | 3 |  > 1100 | 420 | --- |
L8 | 3 | 1 | 1 | 75 | 17 | 200 |
L9 | 3 | 3 | 1 | 460 | 90 | 2000 |
L10 | 2 | 0 | 0 | 9.2 | 1.4 | 38 |
H1 | 3 | 3 | 1 | 460 | 90 | 2000 |
H2 | 2 | 2 | 1 | 28 | 8.7 | 94 |
H3 | 3 | 2 | 1 | 150 | 37 | 420 |
H4 | 3 | 3 | 3 |  > 1100 | 420 | --- |
H5 | 3 | 2 | 2 | 210 | 40 | 430 |
H6 | 2 | 2 | 2 | 35 | 8.7 | 94 |
H7 | 2 | 1 | 2 | 27 |  + 8.7 | 94 |
H8 | 3 | 3 | 3 |  > 1100 | 420 | --- |
H9 | 3 | 1 | 1 | 75 | 17 | 200 |
H10 | 2 | 0 | 0 | 9.2 | 1.4 | 38 |