Gingerol and Shogaol Nanoemulsion of Ginger Extract-based Subcritical Water Extraction

Abstract

The aim of the present study was determine optimum processing conditions and nanoemulsion formulation for the preparation of gingerol and shogaol nanoemulsion from ginger extract-based subcritical water. For this purpose, nanoemulsions were prepared with rotor-stator homogenizer and varied surfactant and cosurfactant concentrations (24%, 26% and 28% v/v), and stirring speed (22,000 rpm, 24,000 rpm). The stirring time is adjusted to 30 minutes. The density, viscosity, pH, % transmittance, nanoemulsion type test, centrifugation test, particle size, zeta potential, and polydispersion index was observed. Nanoemulsion with 28% emulsifier has a % transmittance value closest to 100% indicating that the particle size is estimated at nanometers. The results of test showed that the formed ginger extract nanoemulsion was unstable. Therefore, further studies are needed to find the optimum process conditions and nanoemulsion formulations to form stable