Table 1: Antibacterial activity of the three compounds (100 μmol/L) against six strains in vitro.

CompoundsInhibition rate (%)
E. coli ATCC 25922B. subtilis ATCC 6051S. aureus ATCC 25923A. baumannii ATCC BAA-1710DK. pneumonia ATCC BAA-1705P. aeruginosa ATCC 39324

1a11.33 ± 7.24Inactive91.51 ± 7.988.51 ± 1.355.03 ± 2.36Inactive
1b16.55 ± 4.22InactiveInactive10.05 ± 2.468.07 ± 1.231.38 ± 1.26
1c0.55 ± 2.19InactiveInactive14.40 ± 3.5913.54 ± 4.588.65 ± 3.58
Ampicillin99.34 ± 3.26
Streptomycin94.12 ± 6.5697.05 ± 4.24
Kanamycin87.34 ± 3.19
Chloramphenicol82.43 ± 9.2986.65 ± 7.37

Values are mean ± standard deviation of three independent experiments. The bacteria were seeded in 96-well microplates at concentration of 1 × 105 CFU/mL in Luria Broth medium. Tested compounds and positive controls were added to a final concentration of 100 μmol/L. Inhibiting growth of the bacteria was determined at 450 nm using an ELISA plate reader after shaking on a vibrating platform at 37°C for 8 h. compared with the control.