Table 2.
Effects of peracetic acid (30 mg/L) and sodium hypochlorite (250 mg/L) on the count (log cfu/cm2) of S. aureus S3 cells (grown in meat-based broth at 7 and 28 °C) forming a 15-days biofilm onto polypropylene and stainless steel surfaces.
| Sanitizers | Temperature | Control | Treated | Fraction reduction* |
|---|---|---|---|---|
| Polypropylene | ||||
| Peracetic acid | 7 °C | 6.1 (± 0.2)a | 2.4b | 3.7 |
| 28 °C | 5.3(± 0.3)a | 2.7b | 2.6 | |
| Sodium hypochlorite | 7 °C | 6.2(± 0.3)a | 4.3b | 1.9 |
| 28 °C | 5.6(± 0.3)a | 3.2b | 2.4 | |
|
| ||||
| Stainless steel | ||||
| Peracetic acid | 7 °C | 6.3a(± 0.3) | 3.1b | 3.2 |
| 28 °C | 5.6(± 0.2)b | 2.8b | 2.8 | |
| Sodium hypochlorite | 7 °C | 6.1a(± 0.2) | 3.4b | 2.7 |
| 28 °C | 5.8(± 0.2)b | 3.2b | 2.6 | |
*
in relation to the counts found in control assay.
Values followed for the same letters in each row differ significantly (p < 0.05) according to the Student t test.