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Table 1 Antibacterial activity of R. communis essential oil, using agar disc diffusion, IC 50 and minimal inhibition concentration (MIC)

From: Essential oil of the leaves of Ricinus communis L.: In vitro cytotoxicity and antimicrobial properties

Strains DDa IC50b MICc DDd
Bacterial strains Gram (+)
 Bacillus subtilis 28.4 ± 0.8 480 ± 1 >190.00 26 ± 0.6
 Staphylococcus aureus 1327 24.0 ± 1.0 290 ± 5 >150.00 20 ± 0.5
 Enterobacter cloacae 22.6 ± 0.7 390.5 ± 19 >150.00 21 ± 1.4
 Staphylococcus epidermidis 16.6 ± 0.7 210 ± 5 >120.00 22 ± 0.5
 Enterococcus faecalis 15.2 ± 1.0 290 ± 10 >180.00 25 ± 1.0
 Staphylococcus aureus 25923 14.0 ± 1.0 500 ± 20 >150.00 24 ± 0.5
 Micrococcus luteus 8.0 ± 0.5 230 ± 5 >140.00 20 ± 1.5
 Bacillus cereus 6.1 ± 0.9 300 ± 10 >130.00 21 ± 1.0
Bacterial strains Gram (-)
 Pseudomonas aeruginosa 27853 8.2 ± 0.8 530 ± 10 >270.00 20 ± 1.0
 Klebsiella pneumoniae WHO24 6.2 ± 0.4 652 ± 8 >320.00 21 ± 0.9
 Escherchia coli 25922 4.2 ± 0.9 430 ± 5 >240.00 22 ± 0.8
 Salmonella 4.2 ± 0.6 590 ± 10 >250.00 29 ± 1.0
  1. Results are means of three different experiments.
  2. aDD: Disc Diameter of inhibition (halo size) in millimeters, Essentiel.oil 100 μg/disc.
  3. bMIC: minimum inhibitory concentration (in micrograms per milliliter).
  4. cIC50: 50% inhibition concentration (in micrograms per milliliter).
  5. dDD: Disc Diameter of inhibition zone of Ampicillin (10 μg/disc), was used as positive controls for bacteria.