Tuning photosensitized singlet oxygen production from microgels synthesized by polymerization in aqueous dispersed media

2019 ◽  
Vol 10 (23) ◽  
pp. 3170-3179 ◽  
Author(s):  
Luca Petrizza ◽  
Mickael Le Bechec ◽  
Emile Decompte ◽  
Hind El Hadri ◽  
Sylvie Lacombe ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Vinyl Acetate ◽  
Rose Bengal ◽  
Oxygen Production ◽  
Polymer Colloids ◽  
Grafted Polymer ◽  
Dispersed Media ◽  
Aqueous Dispersed Media ◽  
Vinyl Benzyl

Miniemulsion copolymerization of vinyl acetate, N-vinylcaprolactam, vinyl benzyl Rose Bengal and divinyl adipate to synthesize switchable photosensitizer-grafted polymer colloids for interfacial photooxygenation reactions.

scholarly journals New polymeric photosensitizers

2001 ◽  
Vol 73 (3) ◽  
pp. 491-495 ◽  
Author(s):  
Maria Nowakowska ◽  
Mariusz Kepczynski ◽  
Krzysztof Szczubialka
Keyword(s):  
Singlet Oxygen ◽  
Polymer Chain ◽  
Rose Bengal ◽  
Quantum Yields ◽  
Oxygen Production ◽  
Oxygen Formation ◽  
Singlet Oxygen Formation

Novel polymeric photosensitizers for singlet oxygen production in water are described. The polymers contain rose bengal (4,5,6,7-tetrachloro-2',4',5',7'­tetraiodo-fluorescein) chromophores covalently attached to the polymer chain. The quantum yields of singlet oxygen formation and photooxidation of phenol in water have been determined. The methods of separation of photosensitizer from the reactants after completion of reaction have been established.

Efficient photocatalytic oxygenation of alkenes by water soluble sensitizer in organic–water biphasic media

2016 ◽  
Vol 20 (06) ◽  
pp. 670-676 ◽  
Author(s):  
Mahdi Hajimohammadi ◽  
Hoda Ghasemi
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Molecular Oxygen ◽  
Rose Bengal ◽  
Room Temperature ◽  
Water Soluble ◽  
Oxygen Production ◽  
Oxidation Of Olefins ◽  
Major Route

A new green, environmentally and economically photooxygenation of olefins by molecular oxygen in the presence of 4-carboxyl tetra phenyl porphyrin (H2TCPP), Rose Bengal (RB), Methylene Blue (MB) and some metallosensitizers (MS) such as cobalt phthalocyaninesulfonate (Coph(SO3H)[Formula: see text], MnTCPPCl, FeTCPPCl and SbTPP(OH)2 as water–soluble sensitizers in organic–water biphasic media at room temperature under visible light was illustrated. The products were obtained with 100% conversion by H2TCPP and 100% selectivity by Coph(SO3H)4. Also in this study, singlet oxygen production as the major route for oxidation of olefins was proved.

scholarly journals Functionalization of Photosensitized Silica Nanoparticles for Advanced Photodynamic Therapy of Cancer

2021 ◽  
Vol 22 (12) ◽  
pp. 6618
Author(s):  
Ruth Prieto-Montero ◽  
Alejandro Prieto-Castañeda ◽  
Alberto Katsumiti ◽  
Miren P. Cajaraville ◽  
Antonia R. Agarrabeitia ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Silica Nanoparticles ◽  
Mesoporous Silica Nanoparticles ◽  
Absorption Capacity ◽  
Oxygen Production ◽  
Photodynamic Therapy Of Cancer ◽  
Custom Made ◽  
Fluorescence Efficiency ◽  
Covalently Linked

BODIPY dyes have recently attracted attention as potential photosensitizers. In this work, commercial and novel photosensitizers (PSs) based on BODIPY chromophores (haloBODIPYs and orthogonal dimers strategically designed with intense bands in the blue, green or red region of the visible spectra and high singlet oxygen production) were covalently linked to mesoporous silica nanoparticles (MSNs) further functionalized with PEG and folic acid (FA). MSNs approximately 50 nm in size with different functional groups were synthesized to allow multiple alternatives of PS-PEG-FA decoration of their external surface. Different combinations varying the type of PS (commercial Rose Bengal, Thionine and Chlorine e6 or custom-made BODIPY-based), the linkage design, and the length of PEG are detailed. All the nanosystems were physicochemically characterized (morphology, diameter, size distribution and PS loaded amount) and photophysically studied (absorption capacity, fluorescence efficiency, and singlet oxygen production) in suspension. For the most promising PS-PEG-FA silica nanoplatforms, the biocompatibility in dark conditions and the phototoxicity under suitable irradiation wavelengths (blue, green, or red) at regulated light doses (10–15 J/cm2) were compared with PSs free in solution in HeLa cells in vitro.

Control of singlet oxygen production in experiments performed on single mammalian cells

2016 ◽  
Vol 321 ◽  
pp. 297-308 ◽  
Author(s):  
Michael Westberg ◽  
Mikkel Bregnhøj ◽  
Alfonso Blázquez-Castro ◽  
Thomas Breitenbach ◽  
Michael Etzerodt ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Mammalian Cells ◽  
Oxygen Production
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