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Objectives: The current work presents a formulation of curcumin-loaded transethosome (CRM-TE) in the form of a gel and its characterization.Methods: Thirteen formulations were prepared by varying the concentration of Phospholipon 90G as lipid, ethanol, and ratio of lipid: Span using Box- Behnken Design. The optimized formulation was characterized by vesicle size, entrapment efficiency, drug retention, drug permeation through skin, and morphology. Parameters of CRM-TE were compared to other vesicular systems that include liposomes, ethosomes, and transfersomes. Optimized CRM-TE was incorporated into gels, and comparative evaluation was performed. CRM-TE gel was kept at 5±3°C, 25±3°C, and 40±3°C for 180 days, further evaluated for entrapment efficacy and vesicle size.Results: CRM-TE showed 286.4 nm vesicle size, 61.2% entrapment efficiency, 19.8% drug retention, and 71.3% drug permeation at 24 h in the skin. It was found superior in terms of all the parameters as compared to other vesicular formulations. CRM-TE gel also exhibited best characteristics in terms of entrapment efficiency, drug retention, and drug permeation. CRM-TE gel exhibited better stability at 5±3°C in terms of vesicle size and entrapment efficiency as compared to other storage conditions.Conclusion: CRM-TE gel could offer efficient delivery of curcumin through topical route.

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Objective: Present research work aims toward codelivery of two hydrophobic drugs, curcumin (CRM) and duloxetine hydrochloride (DXH) through self-nanoemulsifying drug delivery systems (SNEDDS). Methods:Initially, binary mixture in the ratio of 1:1 was prepared and then loaded into SNEDDS. Box-Behnken design (BBD) was adopted to develop SNEDDS. As per the optimal design, 13 SNEDDS prototypes were prepared. Castor oil, tween-80 and Transcutol P ® were used as oil, surfactant, and cosurfactant, respectively. To 1 mL of SNEDDS, 30 mg each of CRM and DXH was loaded (CRM-DXH-SNEDDS). Results:The design revealed that for mean droplet size, polydispersity index (PDI), as well as percentage drug loading, all the three factors, i.e. ratio of oil (a), surfactant (b), and cosurfactant (c) were found to give significant effect. Factor B showed the most significant effect on mean droplet size (y1). In case of PDI (y2), factors B and C exerted maximum influence, whereas, Factor A has shown non-significant effect. For percentage drug loading of drugs (y3 and y4), all the three factors were found to have the most significant effect. The optimized batch of CRM-DXH-SNEDDS having composition castor oil, tween-80, and Transcutol P ® in the ratio: 2.17:5.22:2.61, revealed that the mean drug loading (%) of CRM and DXH in an optimized batch of SNEDDS was found to be 87.22±1.87 and 92.32±0.19%, respectively. The mean droplet size, PDI, and zeta potential of formed SNEDDS were observed as 113.14±1.14 nm, 0.20±0.026, and −13.2 mV, respectively. Conclusion:BBD provided optimal formula composition for SNEDDS for obtaining desirable drug loading, emulsion droplet size, and zeta potential.