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Gorski, Aleksander, 2026, "Effect of Microviscosity on Photostability and Singlet Oxygen Generation Quantum Yield of meso-Tetraarylporphyrins Embedded in Pluronic F127 Micelles", https://doi.org/10.18150/BYGJEU, RepOD, V1
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Microscopic viscosity (microviscosity) is a key parameter that governs diffusion within living cells and influences the rate of biological processes at the nanoscale. In this study, we propose a simple and effective method for determining microviscosity based on the viscosity-dependent lifetime of the triplet state of a meso phenyl-substituted octaethylporphyrin. This method was applied to measure the microviscosity inside Pluronic F127 micelles as a function of surfactant concentration. Hydrophobic photosensitizers, e.g. porphyrins, commonly used in photodynamic therapy and antibacterial photoinactivation, can be incorporated into micelles to enhance their water solubility. One of widely used, non-toxic, and efficient polymeric surfactant is Pluronic F127. All tested porphyrins, once encapsulated in Pluronic F127 micelles, became highly water-soluble. However, the Pluronic F127 block copolymer influences the efficiency of singlet oxygen generation and the photostability of photosensitizers incorporated into the micelles. The efficiency of singlet oxygen generation by two porphyrins: 5,10,15,20-(tetraphenyl)porphyrin (TPP) and 5,10,15,20-(tetra-2-naphthalenyl)porphyrin (TNP) is clearly correlated with the experimentally determined microviscosity within the Pluronic micelles and is 2-3 times lower than in organic solvent - toluene. The photostability of these photosensitizers is also reduced by a factor of 2 to 7.
microviscosity probe, micelles, porphyrins, photostability, singlet oxygen
https://www.sciencedirect.com/science/article/pii/S0022286026014067?via%3Dihub doi: 10.1016/j.molstruc.2026.146646
CC BY - Creative Commons Attribution 4.0
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