Synthesis and study of the pH effect on the antibacterial activity of ZnSe nanoparticles against the Escherichia coli and Pseudomonas aeruginosa gram-negative bacteria by using disc-diffusion bioassay

In the present research, ZnSe nanoparticles were synthesized by aqueous method at pHs of 8, 10.2, 11.2 and 12.2 and were grown by microwave irradiation at the times of 0 and 6 minutes. In the synthesis process, Se and Zn ions sources were added to each other at the presence of thioglycolic acid as capping agent . Antibacterial properties of these nanoparticles have been carried out by using disc diffusion method (in solid Muller-Hinton-Agar culture) against the Escherichia coli and Pseudomonas aeruginosa gram-negative bacteria in the loading volume of 140 µL of nanoparticles. Generally, results showed that by increasing the radiation time from 0 to 6 min, bacterial growth inhibition zone increased for Pseudomonas aeruginosa bacteria in compare with Escherichia coli bacteria; the highest antibacterial activity is devoted to the cases of pH=10.2 and 11.2, and these samples can be introduced as new agents in the field of nano-biotechnology applications.