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      Anion exchange nanofiber materials activated by daylight with a dual antibacterial effect.

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          Abstract

          Anion exchange polystyrene nanofiber materials (AE) were prepared by electrospinning followed by two-step functionalization of the nanofiber surface by chlorosulfonic acid and ethylendiamine. The photoactive character of these materials was introduced through adsorption of the tetra-anionic 5,10,15,20-tetrakis-(4-sulfonatophenyl)porphyrin photosensitizer (TPPS-AE) on the nanofiber surface or by encapsulation of the nonpolar 5,10,15,20-tetraphenylporphyrin photosensitizer (AE(TPP)) into the nanofibers. Anion exchange nanofiber materials with porphyrins are characterized by a high ion-exchange capacity, photogeneration of singlet oxygen O2((1)Δg), and singlet oxygen-sensitized delayed fluorescence. Due to the photogeneration of cytotoxic O2((1)Δg), the nanofibers exhibited oxidation of the external substrates in aqueous solution and an efficient antibacterial effect when activated by simulated daylight. Adsorption of both TPPS and I(-) on the surface of AE led to the formation of more efficient I-TPPS-AE materials. Rapid photooxidation of I(-) by O2((1)Δg), and the formation of another cytotoxic species, I3(-), on the surface of the nanofibers were responsible for the increased antibacterial properties of I-TPPS-AE and the prolonged antibacterial effect in the dark.

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          Author and article information

          Journal
          Photochem Photobiol Sci
          Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology
          Royal Society of Chemistry (RSC)
          1474-9092
          1474-905X
          Sep 2014
          : 13
          : 9
          Affiliations
          [1 ] Faculty of Sciences, Charles University in Prague, Hlavova 2030, 128 43 Prague 2, Czech Republic. mosinger@natur.cuni.cz.
          Article
          10.1039/c4pp00157e
          25014673
          c1864b83-ed07-488a-bd0c-b7277bc9ba6d
          History

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