Development of microemulsions and sticks containing passion fruit seeds oil

Passion fruit oil has been used on the skin as a moisturizer, antioxidant, and depigmenting, due to its high content of polyphenols. The objective of this work was to evaluate different methods of preparation of microemulsions containing passion fruit seeds oil. For this, we used sonication and high pressure homogenization (HPH) methods under different conditions. In order to characterize the microemulsions, accelerated stability tests, pH, and internal phase droplets size measurements were performed. Then, a double face hydrophilic and lipophilic stick was prepared from the microemulsion chosen and characterized according to their hardness and coloration. The results showed that the microemulsion did not change its internal phase droplets size throughout the study. The stick hydrophilic face had lower hardness and showed less color change than lipophilic face. This study showed that it is possible to develop sticks from microemulsions containing passion fruit seeds oil with good stability characteristics.