The College of Medicine, Mustansiriyah University discussed a master dissertation on the effect of plasma irradiation and gold nanoparticles on drug-resistant bacteria by the postgraduate student, Ms. Zainab Abd Ali. 

The dissertation demonstrated that the study reviewed the antibacterial and anti-biofilm activity of gold nanoparticles prepared using a DC spray technique at four different currents against a group of drug-resistant bacterial species, including Klebsiella pneumoniae, Pseudomonas aeruginosa, Escherichia coli, Staphylococcus aureus, Enterococcus faecalis, and Streptococcus pneumoniae. 

The dissertation employed photoemission spectroscopy to detect the reactive species generated in the plasma discharges within the DC spray system during the gold nanoparticle deposition process.  

The dissertation highlighted that X-ray diffraction analysis confirmed the formation of gold nanoparticles with four distinct crystalline sizes, consistent with the face-centered cubic structure of gold, indicating a high degree of crystalline, energy-dispersive X-ray analysis also revealed a high and clear gold content. 

The dissertation confirmed that using DC-current spray plasma to produce colloidal solutions of nanomaterials is a promising scientific approach, characterized by high capacity and clear efficiency in eliminating various types of drug-resistant bacteria.