Abstract
Diabetes mellitus is a metabolic syndrome characterized by hyperglycemic and increased ROS production, which causes oxidative stress. Catechin isolated from the tea plant has oxidative stress inhibitor activity and anti-diabetic activity with low absorption in circulation systemic. Therefore, it is formulated in a super saturable catechin-self nano emulsifying drug delivery system (SSC-SNEDDS). Stability is one of the factors that affect the safety, quality, and efficacy of SSC-SNEDDS. This study aims to evaluate the stability of the formulated oil phase using oleic acid, croduret as a surfactant, and propylene glycol as a co-surfactant. Stability studies were carried out by several tests, namely heating-cooling cycle assay, freeze-thaw cycle assay, centrifugation, and endurance assay. Droplet characterization in the form of changes in diameter, zeta potential, and mobility in evaluating stability tests using dynamic light scattering-particle size analyzer (DLS-PSA). Real-time stability was also evaluated by observing changes in the infrared spectrum pattern using FTIR-ATR. After the stability test, the emulsion droplet size of SSC-SNEDDS was still below 100 nm and showed good stability. It can be concluded that the formula has a good stability profile.
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