|
|
Polystyrene photoactive nanomaterials producing singlet oxygen
Henke, Petr ; Mosinger, Jiří (advisor) ; Dědic, Roman (referee) ; Kolářová, Hana (referee)
The increasing number of multidrug-resistant strains of bacteria call for alternatives to antibiotic therapy and, more generally, for the antimicrobial material as a component of prevention. Of particular interest is the photodynamic inactivation of bacteria and other pathogens caused by photogenerated singlet oxygen. This work is focused on the field of photoactive polymer nanofiber membranes and nanoparticles, generating singlet oxygen, suitable for medical applications. We prepared different types of photoactive modified polystyrene nanofiber membranes with encapsulated or externally bound porphyrin photosensitizers. These materials efficiently produce highly reactive and cytotoxic singlet oxygen capable of restricted diffusion into to the external environment. Our results demonstrate the crucial role of wettability for materials of this type with a short diffusion length of generated singlet oxygen, illustrate the effect of temperature and indicate their potential use as multifunctional materials. Due to their antimicrobial properties, these materials are suitable alternative to antibiotics and local antiseptics. With good breathability and short diffusion length of singlet oxygen good results can be expect in in vivo tests. From these nanofiber materials we also prepared photoactive extremely...
|
|
| |
|
|
Polystyrene photoactive nanomaterials producing singlet oxygen
Henke, Petr
The increasing number of multidrug-resistant strains of bacteria call for alternatives to antibiotic therapy and, more generally, for the antimicrobial material as a component of prevention. Of particular interest is the photodynamic inactivation of bacteria and other pathogens caused by photogenerated singlet oxygen. This work is focused on the field of photoactive polymer nanofiber membranes and nanoparticles, generating singlet oxygen, suitable for medical applications. We prepared different types of photoactive modified polystyrene nanofiber membranes with encapsulated or externally bound porphyrin photosensitizers. These materials efficiently produce highly reactive and cytotoxic singlet oxygen capable of restricted diffusion into to the external environment. Our results demonstrate the crucial role of wettability for materials of this type with a short diffusion length of generated singlet oxygen, illustrate the effect of temperature and indicate their potential use as multifunctional materials. Due to their antimicrobial properties, these materials are suitable alternative to antibiotics and local antiseptics. With good breathability and short diffusion length of singlet oxygen good results can be expect in in vivo tests. From these nanofiber materials we also prepared photoactive extremely...
|
|
|
Polystyrene photoactive nanomaterials producing singlet oxygen
Henke, Petr
The increasing number of multidrug-resistant strains of bacteria call for alternatives to antibiotic therapy and, more generally, for the antimicrobial material as a component of prevention. Of particular interest is the photodynamic inactivation of bacteria and other pathogens caused by photogenerated singlet oxygen. This work is focused on the field of photoactive polymer nanofiber membranes and nanoparticles, generating singlet oxygen, suitable for medical applications. We prepared different types of photoactive modified polystyrene nanofiber membranes with encapsulated or externally bound porphyrin photosensitizers. These materials efficiently produce highly reactive and cytotoxic singlet oxygen capable of restricted diffusion into to the external environment. Our results demonstrate the crucial role of wettability for materials of this type with a short diffusion length of generated singlet oxygen, illustrate the effect of temperature and indicate their potential use as multifunctional materials. Due to their antimicrobial properties, these materials are suitable alternative to antibiotics and local antiseptics. With good breathability and short diffusion length of singlet oxygen good results can be expect in in vivo tests. From these nanofiber materials we also prepared photoactive extremely...
|
|
|
Polystyrene photoactive nanomaterials producing singlet oxygen
Henke, Petr ; Mosinger, Jiří (advisor) ; Dědic, Roman (referee) ; Kolářová, Hana (referee)
The increasing number of multidrug-resistant strains of bacteria call for alternatives to antibiotic therapy and, more generally, for the antimicrobial material as a component of prevention. Of particular interest is the photodynamic inactivation of bacteria and other pathogens caused by photogenerated singlet oxygen. This work is focused on the field of photoactive polymer nanofiber membranes and nanoparticles, generating singlet oxygen, suitable for medical applications. We prepared different types of photoactive modified polystyrene nanofiber membranes with encapsulated or externally bound porphyrin photosensitizers. These materials efficiently produce highly reactive and cytotoxic singlet oxygen capable of restricted diffusion into to the external environment. Our results demonstrate the crucial role of wettability for materials of this type with a short diffusion length of generated singlet oxygen, illustrate the effect of temperature and indicate their potential use as multifunctional materials. Due to their antimicrobial properties, these materials are suitable alternative to antibiotics and local antiseptics. With good breathability and short diffusion length of singlet oxygen good results can be expect in in vivo tests. From these nanofiber materials we also prepared photoactive extremely...
|
|
|
Bifunctional BODIPY for optical labelling of biomolecules
Bartoň, Jan ; Kotek, Jan (advisor) ; Henke, Petr (referee)
The water-soluble derivate of BODIPY was prepared, which will be further modified in order to prepare bioorthogonal bifunctional BODIPY. Target application of this derivate is fluorescent probe for labelling of biomolecules. Main goals of this thesis were optimalization of synthesis of BODIPY core and sulfonation to positions 2,6. It was found out that sodium salt of sulfonated BODIPY shows good solublility in water and methanol, but it is poorly soluble in less polar solvents. Based on these findings DIPEA salt of sulfonated BODIPY was prepared, which shows outstanding range of solubility from water to dichlormethane. These findings will be used for synthesis of bifunctional water- soluble BODIPY. Further, the potential of Pd-BODIPY complex for detection of CO was reasserted which will be further investigated. Keywords BODIPY, bifunctional, water-soluble, fluorescent probe, fluorescence, protein labelling, solubilization
|
|
|
Photoactive Sulfonated Polystyrene Nanomaterials
Henke, Petr ; Mosinger, Jiří (advisor) ; Lang, Kamil (referee)
This thesis deals with the preparation and study of three new types of photoactive nanomaterials. Sulphonated polystyrene (PS) nanofiber layer with encapsulated photosensitiser 5,10,15,20-meso-tetraphenylporphyrin (TPP) inside the nanofibers and sulfonated PS nanofiber layers with surface-bound cationic photosensitiser (5,10,15,20- tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP) and Sn(IV) (5,10,15,20-tetrakis(N- methylpyridinium-4-yl)porphyrin (TMPyP(Sn)). In addition to the spectral characteristics of these materials were studied ion exchange capacity and photogeneration of H2O2 and 1 O2. For all studied materials were using time-resolved spectroscopy monitoring of 1 O2 phosphorescence or delayed fluorescence of photosensitiser demonstrated 1 O2 photogeneration. H2O2 photogeneration detected by scopoletin fluorescence quenching was found in nanomaterials with surface-bound photosensitiser. Photobactericidal properties against E. coli were detected in all studied nanomaterials. Bactericidal properties were not recorded without the visible light irradiation. This shows that the bactericidal properties of nanofiber nanomaterials are caused by photogenerated 1 O2 or H2O2. Subject headings: photochemistry, photophysics, photocytotoxicity Keywords: singlet oxygen, hydrogen peroxide, nanofibers,...
|
|
| |
guest ::
