Table 2.
Diameters of the inhibition zone of all the active tested compounds against the reference Gram(+) and Gram(-) bacterial strains.
| Inhibition Zone Assay | Diameter of Inhibition Zone (mm) 1 | |
|---|---|---|
| Compound | Gram-Positive Staphylococcus aureus ATCC 25923 |
Gram-Negative Escherichia coli ATCC 25922 |
| Dihydroberberine·HCl (1) | 7.800 | n.a. |
| (S)-Glaucine (7) | 7.600 | n.a. |
| Canthin-6-one (28) | 6.100 | n.a. |
| Harmane (30) | 4.360 | 8.640 |
| Harmine (32) | n.a. | 6.250 |
| Mytragine (34) | 5.420 | n.a. |
| Nigritanine (35) | 10.39 | n.a. |
| Paynantheine (36) | 8.440 | n.a. |
| Speciociliatine (38) | 8.240 | n.a. |
1 Data represent the mean of three independent experiments with standard deviation (SD) not exceeding 0.2; n.a.: not active.