Table 2.
Results from analysis of cultured broth after 72 h of incubation with 5 different type strains of propionibacteria. Results include bacterial counts, pH, glycerol, acids, and inhibition against three different spoilage fungi in a microtitre plate assay. Data in the table show mean values with one standard deviation (n = 4).
| Bacteria | Broth | Bacterial count cfu/ml (log) | pH | Glycerol and acids (mM) | Supernatant inhibition* | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Glycerol | Lactic acid | Acetic acid | Propionic acid | Rhodotorula mucilaginosa | Penicillium commune | Penicillium roqueforti | ||||
| P. acidipropionici | SL | 8.6 ± 0.1 | 5.7 ± 0.0 | 0 | 65 ± 3 | 22 ± 1 | 50 ± 2 | − | − | − |
| GLY | 8.5 ± 0.4 | 4.3 ± 0.0 | 54 ± 1 | 0 | 0 | 46 ± 0 | + | + | + | |
| P. freudenreichii subsp. shermanii | SL | 9.7 ± 0.1 | 6.0 ± 0.0 | 0 | <10 | 39 ± 2 | 77 ± 1 | − | − | − |
| GLY | 9.4 ± 0.1 | 4.7 ± 0.0 | 73 ± 1 | 0 | 0 | 26 ± 0 | + | − | − | |
| P. freudenreichii | SL | 9.5 ± 0.1 | 5.9 ± 0.0 | 0 | <10 | 39 ± 1 | 75 ± 0 | − | − | − |
| subsp. freudenrechii | GLY | 8.8 ± 0.0 | 4.7 ± 0.0 | 74 ± 1 | 0 | 0 | 26 ± 2 | + | − | − |
| P. thoenii | SL | 9.2 ± 0.1 | 5.9 ± 0.0 | 0 | 93 ± 4 | 17 ± 1 | 35 ± 2 | − | − | − |
| GLY | 9.1 ± 0.1 | 4.5 ± 0.0 | 69 ± 1 | 0 | 0 | 33 ± 1 | + | + | +/− | |
| P. jensenii | SL | 9.5 ± 0.2 | 5.8 ± 0.0 | 0 | <10 | 43 ± 1 | 89 ± 1 | − | − | − |
| GLY | 9.2 ± 0.1 | 4.3 ± 0.0 | 51 ± 1 | 0 | 0 | 49 ± 1 | + | + | + | |
*Inhibition was interpreted a: – (no inhibition compared to the control), +/− (weaker fungal growth than control) or + (complete inhibition).