Total Charge of Chitosan and Chitosan Succinyl Macromolecules Effect on the Stability of Particles of Silver Iodide Sols in Polymer-Colloidal Based Dispersions

Obtaining stable polymer-colloidal dispersions based on watersoluble polymers and inorganic colloidal particles, such as silver iodide sol, followed by removal of the dispersion medium is one of the ways to create hybrid biomedical materials (e.g. films, threedimensional matrices). The current work is devoted to studying the possibility of increasing the stability of polymer-colloidal systems based on silver iodide sols, succinyl chitosan and chitosan polysaccharides by reducing the total charge of macromolecules.

Antimicrobial Photodynamic Effects Using Coatings Based on Metal Nanoparticles (Ag, Au)

The combined effect of coatings based on nanoparticles of metals Ag, Au, ultraviolet (365 nm, UVR) and infrared (808 nm, IRR) radiation on Staphylococcus aureus 209 P was studied. Decrease in numbers was shown by 2% in the case of silver coatings and by 8% in the case of gold coatings after 1 h incubation. However, exposure of the IRR to bacterial suspensions caused the death of 43% of the population after 5 min, 86% of the population after 30 min.

Express Method for Cefazolin Determination in Small Samples Sensors Planar Potentiometric

The unmodified and modified by polyaniline and nanoparticles planar potentiometric sensors on the basis of tetradecylammonium associates with a complex silver (I) – cefazolin are created. Optimum ratios of components in carbon-containing ink are established: 30–32% carbon powder, 16–18% polyvinylchloride, 48–50% dibutylphthalate and 1–3% of electrode active compound (EAC). Planar sensors of two types are examined: electrode active compounds, electrode active compound and modifiers were added into in carbon-сontaining ink.

The Study of Antibacterial Properties of Coatins Based on Metal (Ag, Zn) Nanoparticles in Silicon Dioxide Matrix

The influence of coatings on the basis of Ag and Zn metal nanoparticles in a silica matrix in combination with ultraviolet (365 nm) radiation on Staphylococcus aureus 209 P bacteria was studied. It was shown that the investigated coatings without access to light inhibit the growth of microorganisms by 45% after 3 hours of incubation and 55–70% after 5 hours of incubation. Enhancement of antibacterial properties of nanocoatings was achieved by exposure to UV (365 nm) radiation. The decrease in the number of studied microorganisms was noted by 75% after 30 min of exposure.

The Influence of Aqueous Dispersions of Metal Nanoparticles on the Adhesive Properties of the Standard and Clinical Strains of Staphylococcus aureus

The initial stage of interaction of infectious agents with micro-organisms cells is the process of adhesion. So there is a need to develop methods that reduce the adhesive activity of microorganisms. Aim: to study the impact of water and water dialyzed dispersion of silver and copper nanoparticles obtained by biochemical synthesis, on the adhesive properties of the standard and clinical strains of S. aureus. Using standard techniques for cells of S.