<![CDATA[Sacha inchi (Plukenetia volubilis L.) seed oil is a promising bioactive ingredient for topical applications due to its high content of essential fatty acids and antioxidants; however, its hydrophobic nature limits formulation stability and performance. This study aimed to develop and optimize an emulgel delivery system using a systematic mixture design approach to enhance its physicochemical characteristics. A Simplex Lattice Design (SLD) was applied to evaluate the combined effects of Tween 80 (1-5%) and Span 80 (1-5%) on key responses, including pH, viscosity, and adhesion. Emulgel formulations were prepared using a conventional emulsification method followed by incorporation into a gel base, then evaluated accordingly. Data were analyzed using Design Expert® software and ANOVA. The results showed that all formulations met the acceptable criteria for topical application, with pH (5.40–6.30), viscosity (25.1–61.2 P), and adhesion (1.46–3.5 s). Statistical analysis revealed a significant (p < 0.05) and non-linear interaction between surfactants across all responses, indicating the critical role of compositional balance. The optimized formulation, containing 5% Tween 80 and 1% Span 80, achieved a desirability value of 1.00. Overall, the SLD approach proved effective for optimizing emulgel formulations and enhancing the potential of sacha inchi oil as a stable topical delivery system.]]>
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