Eosin-mediated synthesis of polymer coatings combining photodynamic inactivation and antimicrobial properties

Abstract

Eosin-derived coatings exhibiting photodynamic bacterial inactivation and antibacterial properties.

Photoinduced chitosan–PEG hydrogels with long-term antibacterial properties

“…10 7 bacteria per mL) but it slightly increased from 2 to 6 h for E. coli. Such low density on REF-PEG samples can be attributed to the previously-reported antifouling (but not biocidal) properties of the poly(ethylene glycol) 56 . On the contrary, the presence of chitosan in chito3PEG150 and chito3PEG300 hydrogels led to the absence of any detectable living bacteria at the surface of both hydrogels after 2 h and 6 h. The same trend is observed in the presence of S. aureus.…”

Metal‐Free and Heterogeneous Photocatalytic Reduction of 4‐Nitroaniline by a Poly(Ethylene Glycol)‐Supported Eosin Dye under Visible‐Light Exposure

“…To demonstrate the positive effect of oxygen on this photoreduction process, the reactions were performed under air with a large excess of amines with an eosin‐derived support (Figure 3–, EYAM support). As demonstrated by Versace et al., the presence of amines opens up new side‐reaction pathways such as redox reaction between the amines and the photogenerated singlet oxygen. As a consequence, the 4‐NA photoreduction yield highly decreases under this condition and reaches only 80 % after 200 min of irradiation.…”

“…All the samples have been irradiated under the same conditions as previously described. Finally, the last photoinduced reference films (EYAM) containing amines groups were also synthesized: it consists on a DAPEG mixture with a multifunctional amine LP (7 wt %) and 0.5 wt % of EY according to an aza‐Michael process . The thickness of all the synthesized films is evaluated at 1 mm.…”

Co-Networks Poly(hydroxyalkanoates)-Terpenes to Enhance Antibacterial Properties

“…On one hand, passive materials, which prevents bacterial adhesion and can be obtained by the use of poly(ethylene glycol) [6], polysaccharides [7], N-acetylpiperazine or fluorinated compounds [8,9]. On the other hand, active or biocide materials can be prepared via the incorporation of metal nanoparticles which are well-known for their antibacterial activities, such as silver [10] and copper [11], by using polymers having ammonium or sulfonium salts [12] and organic compounds such as N-halamines [13], phenols [14,15] and aromatic acids [16,17]. Essential oils constitute a source of terpenes that are natural molecules, which are known as antibacterial and antimicrobial compounds [18][19][20][21][22].…”