Study of silver nanoparticles synthesized by acidophilic strain of Actinobacteria isolated from the of Picea sitchensis forest soil

Abstract

The synthesized silver bionanoparticles from Streptacidiphilus sp. strain CGG11n possess potent inhibitory effect that offers valuable contribution to pharmaceutical associations.

Silver nanoparticles functionalized with ampicillin

“…According to Railean‐Plugaru et al. CGG silver nanoparticles are stable at pH 6–8 range. We excluded the possibility of antibiotic precipitation at these values of pH.…”

“… confirmed the synergistic antibacterial effect of β‐lactam antibiotics and chemically synthesized silver nanoparticles against E. coli . Moreover, research on biologically synthesized silver nanoparticles suggest that their antibacterial activity is increased when are applied in combination with antibiotics, such as ampicillin, streptomycin, gentamicin, vancomycin, and kanamycin . In our previous study on biologically synthesized silver nanoparticles functionalized with tetracycline we have also shown that such combination increased antimicrobial activity relative to S. aureus , P. aeruginosa , K. pneumoniae , S. epidermidis , and E. coli .…”

Biosorption of silver cations onto Lactococcus lactis and Lactobacillus casei isolated from dairy products

“…Hence, bacteria suspended in NaCl showed greater dispersion stability. This phenomenon is caused by repulsive forces between solvated biocolloids of bacterial cells generated by sodium ions [51, 53]. Potassium ions have a greater ionic radius than sodium ions, which reduces the shielding effect between biocolloids [54].…”

“…When analyzing influence of pH of the system a sharp decrease of zeta potential was noticed for pH 2–4 which was a result of progressive deprotonation of carboxyl groups of bacterial structural components. For pH 5–8 a constant value of zeta potential could be observed which reflected the proteolytic balance [53, 55]. Bacteria after biosorption of Ag + show higher electric charge.…”

“…LAB-Ag demonstrated reduced stability of biocolloids as compared to native cells. This was a consequence and also an evidence of the biosorption processes of silver cations on the surface of bacterial cells [22, 53, 55, 56]. …”