TABLE 2.
Antibacterial activities of emulsions of MC and TW40 at various pHs
| MC-TW40 concnb | pH | Reduction of CFU (log10)a
|
||
|---|---|---|---|---|
| Salmonella spp. | E. colic | C. jejuni | ||
| 1.25 mM-0.005% | 4.1 | ≥7.0 | ≥6.7 | ND |
| 1.25 mM-0.005% | 4.5d | ≥7.0 | ≥6.7 | ND |
| 1.25 mM-0.005% | 5.0 | 6.60 ± 0.84 | ≥6.7 | ND |
| 1.25 mM-0.005% | 5.5 | 1.90 ± 0.14 | 2.06 ± 0.07 | ND |
| 5 mM-0.02% | 5.5 | 0.78 ± 0.63 | 2.43 ± 0.13 | ND |
| 5 mM-0.02% | 7.2 | 0.30 ± 0.17 | 0.98 ± 0.19 | ND |
| 0.625 mM-0.0025% | 4.1 | ND | ND | ≥6.0e |
| 0.625 mM-0.0025% | 7.2 | ND | ND | 1.04 ± 0.76 |
| Acid controlf | 4.1 | 0.13 ± 0.06 | 0 | 0.10 ± 0.10 |
a
Compared with count of bacteria mixed 1:1 with control solution at pH 7. Values are means ± standard deviations of at least four determinations. Standard deviations were not available for those values shown without them. ND, not done.
b
Concentrations after the addition of bacteria (1:1).
c
Means are for both E. coli strains, each tested at least twice.
d
Bacteria were treated at room temperature for 10 min with the same results.
e
Activity against C. jejuni was tested for 10 min at room temperature.
f
Buffer without MC.