Table 2. Anti-listeria activity of different Ply500 formulations on lettuce inoculated with L. innocua cellsa.
Ply500 Formulation | Log CFU after 24 h |
---|---|
Cell control | 1.7 ± 0.09 |
Lettuce + listeria control | 4.0 ± 0.05 |
Ply500 (50 μg) | No cellsb |
Ply500-SNP (200 μg) | No cellsb |
FP10 (42 μg) | 2.1 ± 0.05 |
FP10-starch nanoparticle (80 μg) | 2.8 ± 0.14 |
aListeria cells were grown in BHI media for 7 h and lettuce was inoculated with 50 L. innocua cells. Standard deviations were calculated from triplicate measurements. No significant killing was observed with controls of SNP-NCO, MBP, starch nanoparticles, MBP-starch nanoparticles. The amount (in μg) represents the Ply500 content of the formulation.
bNo viable L. innocua cells were observed in the plating assay.