Abstract
Essential oils consist of oxygenated structures of secondary metabolites of aromatic plants with anti-psoriatic activities. Tea tree oil (TTO) is an essential oil with good anti-microbial and anti-inflammatory properties, exhibiting reduced levels of IL-1, IL-8, and PGE 2. Thymoquinone (TMQ) is popular herb in traditional medicine with known therapeutic benefits in several diseases and ailments. The ternary phase diagram was prepared with the weight ratio of Smix (Tween® 80:Labrasol®): oil:water ratio for o/w emulsion preparation. The globule size was 16.54 ± 0.13nm, and PDI around 0.22 ± 0.01 of the TTO-TMQ emulsion and found thermodynamically stable. The percentage drug content was found in the range of 98.97 ± 0.62 to 99.45 ± 0.17% with uniformity of the ThymoGel using Carbopol®. The extensive physicochemical properties were studied using different analytical techniques, and in vitro drug release was performed using Franz-diffusion apparatus. Anti-psoriatic activity of the formulations was studied using Imiquimod-induced psoriasis-like inflammation model in male Balb/c mice and parameters like PASI score, ear thickness, and spleen to body weight index were determined as well as histological staining, ELISA, skin compliance, and safety evaluation of TTO were performed. The combination of essential oils with TMQ shows synergistic activity and efficiently reduces the psoriasis disease condition.
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