Abstract
The present study was aimed to use the aqueous extract of
Capparis spinosa to synthesize the copper nanoparticles and also
evaluated their antibacterial activities again some pathogenic
bacterial strains. UV-vis spectroscopy analyses, fourier
transform of infrared (FTIR), scanning electron microscopy
(SEM), and energy dispersive X-ray (EDX) were used to identify
the synthesized nanoparticles. The antimicrobial activity of
the synthesized copper nanoparticles was investigated using
disk diffusion method and broth microdilution against some
Gram-positive and Gram-negative bacteria. After adding the
extract to the copper sulfate solution, the color of the solution
changed from light blue to yellowish green. Existence of a
maximum peak at the wavelength of 414 nm confirmed the
formation of the copper nanoparticles. FTIR spectrum analysis
showed that the factor groups created a coating extract on the
surface of the nanoparticles. Scanning electron microscopy
demonstrated the particle size between 17 and 41 nm. These
findings showed that Staphylococcus aureus and Bacillus cereus
as Gram-positive bacteria were most susceptible to synthesized
copper nanoparticles in comparison with the Gram-negative
bacteria (Klebsiella pneumoniae, and Escherichia coli). The
obtained findings demonstrated that the aqueous extract of C.
spinosa acts as a reviver and stabilizer factor. The synthesized
copper nanoparticles demonstrated activity against both Grampositive
and Gram-negative bacteria.