Photophysical and antibacterial properties of complex systems based on smectite, a cationic surfactant and methylene blue

摘要: Solid or colloidal materials with embedded photosensitizers are promising agents from the medical environmental perspective, where direct use of photoactive solutions appears to be problematic. Colloids based on layered silicates saponite (Sap) and montmorillonite (Mon) type, including those modified dodecylammonium cations (C12) photosensitizer--methylene blue (MB) were studied. Two representatives bacteria, namely Enterobacter cloacae Escherichia coli, selected for this work. A spectral study showed that MB also colloids Sap C12 exhibited highest photoactivities. The antimicrobial properties smectite not directly linked photoactivity adsorbed cations. They influenced by other parameters, such as light vs. dark conditions, spectrum, power duration used irradiation; growth phases, pre-treatment microorganisms. Both improved upon pre-modification C12. Significantly higher observed Mon in form molecular aggregates without significant MB/Mon colloids, both non-modified cations, effects than pure solution. Besides effect photosensitization, surface silicate particles likely played a crucial role interactions