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• W2938894224 abstract "The aim of this study was to prepare a microemulsion based hydrogel containing sesame oil and evaluate its topical application in preventing the harmful effects of UV radiation on the guinea pig's skin using histopathologic and clinical findings. Sesame oil with high antioxidant content and unique chemical and physiological properties is a suitable candidate for the evolution of UV protection on skin. Applying this natural oil in microemulsion formulation containing particles with nanometer size can enhance its efficacy. To prepare a stable microemulsion, it is necessary to select the appropriate surfactants. In this study, first the best combination of hydrophilic surfactant of Tween 80 with various lipophilic surfactants such as Span 20, Span 80 and Span 85 at different surfactant ratios was examined. The microemulsion formulations were assessed for particle size, zeta potential, polydispersity index, refractive index, electrical conductivity, pH value and stability. Results showed that among various samples, microemulsion containing a mixture of Tween 80 and Span 80 with the surfactant ratio of 9:1 was the best sample in terms of stability over time (six months). This sample had a lower particle size of 26.09 nm with a narrow particle size distribution. For topical application, the microemulsion based hydrogel was prepared with 0.6% Carbomer 940 as a gelling agent. The pH value and viscosity of gel formulation were 6.6 and 12.90 Pa.s, respectively, which is appropriate for topical applications. A slight enhancement of particle size inside hydrogel structure was observed after six months of the gel preparation. The clinical evolutions of formulation on guinea pig's skin were included skin scaling, skin irregularity, erythema, skin hyperpigmentation, and edema. Epidermal hyperkeratosis, hyperpigmentation, exocytosis, acanthosis, chromatin discoloration in nucleus of epidermal squamous cells, perifolliculitis, dermal vascular hyperemia, edema and dermal thickness, infiltration of plasma cell lymphocytes and eosinophils into dermis were observed for histopathological investigations. Based on clinical and histopathological examinations, topical application of microemulsion-based hydrogel of sesame oil can effectively prevent skin damage induced by UV radiation and is therefore suitable for skin products." @default.
• W2938894224 created "2019-04-25" @default.
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• W2938894224 date "2019-07-01" @default.
• W2938894224 modified "2023-10-17" @default.
• W2938894224 title "Formulation, clinical and histopathological assessment of microemulsion based hydrogel for UV protection of skin" @default.
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• W2938894224 doi "https://doi.org/10.1016/j.colsurfb.2019.04.015" @default.
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