Development of Microemulsion Based Topical Ivermectin Formulations: Pre-Formulation and Formulation Studies

Publication date: Available online 23 January 2020Source: Colloids and Surfaces B: BiointerfacesAuthor(s): Surajit Das, Lee Sie Huey, Vernissa Dilys Chia Chye Ting, Pui Shan Chow, Calum Macbeath, Yuanjie Liu, George ShlieoutAbstractThe aim of this work was to develop microemulsions and microemulsion gels which can be used as vehicles for the topical delivery of ivermectin. Tea tree oil and ethyl butanoate were found to be suitable for ivermectin-loaded microemulsion formulations due to the higher solubility of ivermectin in these two oils than other tested oils. The pseudo-ternary phase diagrams were constructed based on these selected oils and combination of different surfactant/co-surfactant at different ratios. Ivermectin-loaded stable microemulsions and microemulsion gels were successfully formulated based on the selected compositions from the phase diagrams. Ivermectin-loaded microemulsions showed spherical nano-droplets dispersed in the continuous phase (via cryogenic field emission scanning electron microscope image) and the particle size was less than 100 nm (via dynamic light scattering measurement). Ethyl butanoate based microemulsion appeared to be the best microemulsion formulation considering the stability and permeation profiles while tea tree oil based microemulsion showed the best stability profile. Overall, microemulsion gel formulations exhibited better stability profiles than their microemulsion counterparts. All microemulsion gel formulations demonstrate...
Source: Colloids and Surfaces B: Biointerfaces - Category: Biochemistry Source Type: research