Table 2.
Antibacterial activity of bud resins and selected propolis extracts
| (Minimal Inhibitory Concentration MIC (μg/ml) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microorganism | Bud resin | Propolis extract | |||||||||||
| Downy birch (Ex-1) | Silver birch (Ex-2) | Aspen (Ex-3) | Black poplar (Ex-4) | Horse-chestnut (Ex-5) | Black alder (Ex-6) | Scots pine (Ex-7) | Latvian (Pr-1) | Latvian (Pr-2) |
Finnish (Pr-3) |
Russian (Pr-4) |
Russian (Pr-5) |
Latvian (Pr-6) | |
| Gram-positive bacteria | |||||||||||||
| Staphylococcus aureus | 39 | 78 | 39 | 78 | 156 | 20 | 20 | 62 | 16 | 62 | 16 | 16 | 16 |
| Staphylococcus schleiferi | 39 | 39 | 39 | 39 | 312 | 78 | 156 | 31 | 31 | 31 | 31 | 31 | 31 |
| Staphylococcus saprophyticus | 39 | 39 | 39 | 39 | 312 | 78 | 78 | 31 | 16 | 31 | 31 | 16 | 31 |
| Bacillus thuringiensis | 78 | 78 | 39 | 78 | 156 | 78 | 39 | 31 | 31 | 62 | 31 | 16 | 31 |
| Bacillus cereus | 78 | 156 | 39 | 78 | 312 | 78 | 39 | 62 | 62 | 62 | 62 | 31 | 62 |
| Gram-negative bacteria | |||||||||||||
| Pseudomonas aeruginosa | 250 | 500 | 250 | 500 | 250 | 250 | 250 | 250 | 250 | 500 | 500 | 500 | 500 |
| Escherichia coli | >5000 | >5000 | >5000 | >5000 | >5000 | >5000 | >5000 | 2500 | 5000 | 5000 | 5000 | 5000 | 2500 |
| Fungus | |||||||||||||
| Candida albicans | 32 | 64 | - | 32 | 64 | 32 | 39 | 156 | 39 | 39 | 78 | 312 | 78 |