Table 3 Determining nisin in food extracts with the agar diffusion assay and the indicator microorganism L. curvatus. Extract treatment (under the same dilution factor and addition of the same concentration of nisin) and inhibition zones formation
Source of Extract | Zones of inhibition | |||
|---|---|---|---|---|
Treatment | Untreated | Alkali treated | Nisin added | Control |
Cream of chicken soup | + | - | + | - |
Shrimp and cheese paste | + | + | + | - |
Mayonnaise | - | - | + | - |
Marinated herring | - | - | + | - |
Cream cheese | + | - | + | - |