TABLE 2.
Correlation of cell densities in skim milk by plate counts and QC-PCR
| Sampling time (h post-incubation) | CFU/ml quantified by:
|
Regression equations of QC-PCR and r2
|
||
|---|---|---|---|---|
| Plate countsa | QC-PCR | Equation | r2 | |
| 4.5 | (5.50 ± 0.31) × 103 | 3.34 × 103 | Y = −0.98X + 3.47 | 0.95 |
| 6 | (9.87 ± 0.65) × 104 | 7.50 × 104 | Y = −1.10X + 5.41 | 0.92 |
| 7.5 | (6.30 ± 0.56) × 106 | 4.04 × 106 | Y = −0.98X + 6.45 | 0.94 |
| 8 | (1.10 ± 0.06) × 107 | 7.95 × 106 | Y = −0.96X + 6.65 | 0.99 |
| 9 | (7.20 ± 0.53) × 107 | 6.50 × 107 | Y = −1.06X + 8.30 | 0.97 |
a
Mean plate counts (± standard deviation) of three replicate samples.