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

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

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

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)

ISSN: 2048-7010