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Interaction of eosin and its ester derivatives with aqueous biomimetic micelles: Evaluation of photodynamic potentialities

Paper ID Volume ID Publish Year Pages File Format Full-Text
27017 43994 2014 10 PDF Available
Title
Interaction of eosin and its ester derivatives with aqueous biomimetic micelles: Evaluation of photodynamic potentialities
Abstract

•Molecular modeling allowed to justify the absorption and its environment dependence.•Photophysical properties are modulated by charge and hydrophobic character of dye.•Pluronics are good candidates as drug delivery systems to eosin derivatives.•Eosin esters have shown good properties to be applied in photodynamic treatments.

In this paper, the physicochemical and photophysical properties of xanthene dyes interacting with micelles were evaluated. Xanthenes are potential photosensitizers for photodynamic therapy. The dyes were eosin Y and its ester derivatives with methyl, butyl and decyl alkyl groups.In aqueous media at physiological pH eosin is present as dianionic protolytic form while its esters are monoanionic. Analysis of the water/octanol partition coefficient showed that the eosin is the most hydrophilic compound and the hydrophobicity increases as the alkyl chain of the ester increases: eosin < methyl ester < butyl ester < decyl ester. Computational calculations of the dipole moments, molecular volume, charge distribution, solvation energy and molecular orbital performed by the B3LYP/DGDZVP method and IEFPCM solvent model, allowed to justify the electronic absorption properties and its dependence with the dye environment. In order to mimic the interaction of these compounds with membranes, it was used micelles of sodium dodecyl sulfate (SDS), cetyl trimethylammonium bromide (CTAB) and polymeric micelles (Pluronics®) of P-123 and F-127. The binding constant between the xanthenes and micelles increased with the hydrophobicity of the dye in all evaluated systems. Furthermore, we observed the formation of pre-micellar aggregates when using cationic CTAB micelles due to electrostatic attraction. The iodide fluorescence quenching showed that the more hydrophobic photosensitizer were located deeply within the micelles. The fluorescence quantum yield values increased in the presence of surfactants, indicating protection against non-radiative deactivation. The dyes singlet oxygen quantum yield values suffered a small decrease when formulated in micelles, however they are still suitable for photodynamic applications. The results show that eosin and its ester derivatives have favorable characteristics for use in photodynamic therapy, particularly formulated in biocompatible polymeric surfactants such as Pluronics®.

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Keywords
Eosin; Photodynamic therapy; Micelles; Biomimetic
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 287, 1 August 2014, Pages 30–39
Authors
, , , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us