Abstract

Chemical precipitation method was used in order to synthesize of CdSe quantum dots (2 - 3nm). Their physical properties and characteristics were assessed by X-ray diffraction, ultraviolet-visible spectrophotometery and scanning tunneling microscopy and it was shown that the obtained CdSe quantum dots have a cubic crystal structure. It was also shown that size and optical properties of CdSe quantum dots are related to the temperature (The temperature used by UV-Vis photometer). Antibacterial effects of CdSe nanoparticles against some pathogenic bacteria were investigated. Pseudomonas aeruginosa, Actinomycet and Salmonella typhi were used as test microorganisms. Disc bacteriological tests were used in order to assess the antibacterial effects of CdSe. The concentrations from 0.3 to 20 mg/mL of CdSe were investigated and it was concluded that the zone of inhibition diameter was strongly and directly related to the CdSe concentration. Actinomycet being the most affected bacteria.

Keywords: Quantum dots, antibacterial effect, Pseudomonas aeruginosa, Actinomycetes, Salmonella typhi.

Graphical Abstract