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Photophysical and antibacterial properties of complex systems based on smectite, a cationic surfactant and methylene blue.
Donauerová, Alena; Bujdák, Juraj; Smolinská, Miroslava; Bujdáková, Helena.
Affiliation
  • Donauerová A; Comenius University in Bratislava, Faculty of Natural Sciences, Department of Microbiology and Virology, Bratislava, Slovakia.
  • Bujdák J; Comenius University in Bratislava, Faculty of Natural Sciences, Department of Physical and Theoretical Chemistry, Bratislava, Slovakia; Institute of Inorganic Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia.
  • Smolinská M; Comenius University in Bratislava, Faculty of Natural Sciences, Department of Microbiology and Virology, Bratislava, Slovakia.
  • Bujdáková H; Comenius University in Bratislava, Faculty of Natural Sciences, Department of Microbiology and Virology, Bratislava, Slovakia. Electronic address: bujdakova@fns.uniba.sk.
J Photochem Photobiol B ; 151: 135-41, 2015 Oct.
Article in En | MEDLINE | ID: mdl-26248233
ABSTRACT
Solid or colloidal materials with embedded photosensitizers are promising agents from the medical or environmental perspective, where the direct use of photoactive solutions appears to be problematic. Colloids based on layered silicates of the saponite (Sap) and montmorillonite (Mon) type, including those modified with dodecylammonium cations (C12) and photosensitizer--methylene blue (MB) were studied. Two representatives of bacteria, namely Enterobacter cloacae and Escherichia coli, were selected for this work. A spectral study showed that MB solutions and also colloids with Sap including C12 exhibited the highest photoactivities. The antimicrobial properties of the smectite colloids were not directly linked to the photoactivity of the adsorbed MB cations. They were also influenced by other parameters, such as light vs. dark conditions, the spectrum, power and duration of the light used for the irradiation; growth phases, and the pre-treatment of microorganisms. Both the photoactivity and antimicrobial properties of the colloids were improved upon pre-modification with C12. Significantly higher antimicrobial properties were observed for the colloids based on Mon with MB in the form of molecular aggregates without significant photoactivities. The MB/Mon colloids, both modified and non-modified with C12 cations, exhibited higher antimicrobial effects than pure MB solution. Besides the direct effect of photosensitization, the surface properties of the silicate particles likely played a crucial role in the interactions with microorganisms.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Silicates / Methylene Blue / Anti-Bacterial Agents Language: En Journal: J Photochem Photobiol B Journal subject: BIOLOGIA Year: 2015 Document type: Article Affiliation country: Slovakia Country of publication: CH / SUIZA / SUÍÇA / SWITZERLAND

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Silicates / Methylene Blue / Anti-Bacterial Agents Language: En Journal: J Photochem Photobiol B Journal subject: BIOLOGIA Year: 2015 Document type: Article Affiliation country: Slovakia Country of publication: CH / SUIZA / SUÍÇA / SWITZERLAND