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Table 2 Mean zone of inhibition (in mm) of CuO-NPs against bacterial strains

From: Green synthesis, characterization, antibacterial and photocatalytic activity of black cupric oxide nanoparticles

Bacterial strains CuO-NPs Negative control (NC)a Positive control (PC)b
Staphylococcus aureus 20.33 ± 0.88 (1.52) S 6.66 ± 0.33 (0.57) R 10.66 ± 0.33 (0.57) S
Streptococcus mutans 17.66 ± 0.88 (1.52) S 6.33 ± 0.33 (0.57) R 14.66 ± 0.33 (0.57) S
Streptococcus pyogenes 18.66 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 14.33 ± 0.33 (0.57) S
Streptococcus viridans 15.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 12.33 ± 0.33 (0.57) S
Staphylococcus epidermidis 7.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 10.33 ± 0.33 (0.57) S
Corynebacterium xerosis 17.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 12.33 ± 0.33 (0.57) S
Bacillus cereus 18.66 ± 0.33 (0.57) 6.33 ± 0.33 (0.57) R 12.33 ± 0.66 (1.15) S
Escherichia coli 13.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 18.33 ± 0.33 (0.57) S
Klebsiella pneumoniae 20.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 28.33 ± 0.33 (0.57) S
Pseudomonas aeruginosa 17.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 14.33 ± 0.33 (0.57) S
Proteus vulgaris 11.33 ± 0.33 (0.57) S 6.33 ± 0.33 (0.57) R 22.33 ± 0.33 (0.57) S
  1. Values are expressed as mean ± SE; where, S = sensitive (> 7 mm zone of inhibition), R = resistant (< 7 mm zone of inhibition), aDimethyl sulphoxide, bStandard drug norfloxacin for Gram-positive and gentamicin for Gram-negative strains)