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AGGREGATIC STABILITY AND BACTERICIDAL EFFECT OF NANOSILVER COLODID SOLUTIONS IN THE PRESENCE OF SURFACE-ACTIVE SUBSTANCES OF DIFFERENT CHEMICAL NATURE
Abstract
The bactericidal properties of silver and its compounds are known for a long time. Silver has antimicrobial properties against a wide range of microorganisms, not only bacteria, but also some fungi, as well as viruses. However, several mechanisms have been identified for the formation of resistance to silver in bacteria. It?s relevant to search for new reagents, which would increase the aggressive stability of the argentum?s compounds. Purpose is study of the influence of various chemical nature SAS on the aggregate stability of nanosilver colloidal solutions and the determination of bactericidal activity of such multi-component systems. Objects are colloidal solutions of nanosilver. Subject of research is bactericidal activity of multi component argentum?s solutions. The aggregate stability of the resulting colloidal solutions was determined by the spectral method (spectrophotometer SF-56, RF), measuring the spectra of the surface plasmon resonance of silver nanoparticles immediately after their receipt and after 24 hours. The bactericidal properties of silver nanoparticles solutions were investigated using reference strains of the Enterobacteriacea Escherichia coli family. The influence of SAS of different chemical nature on aggregate stability and bactericidal action of nanosilver colloidal solutions is investigated. Colloidal solutions of silver were obtained by restoring the titanium nitrate agent in a neutral medium. With the help of spectrophotometric method, it has been proved that such solutions are characterized by high aggregate stability compared with the use of other traditional reducing agents. Anionic SAS (sodium dodecylsulfate and sulfanol) and nonionic SAS (OS-20) increase aggregate stability of nanosilver solutions, while cationogenic SAS - Alcammon promotes rapid coagulation and aggregation of nano silver particles. The study of bactericidal action of the solutions to the E. coli are showed that the nanosilve colloidal solution with or without presence of OS-20 and Alcamone completely inhibit the growth of colonies of E.coli, that is, it have high bactericidal properties.
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