The physical stability was measured with Turbiscan ASG (Formulaction, Toulouse, France), which simultaneously records light transmission and backscattering on the dispersed oil droplets. The analyzed emulsion (20 mL) was put into a flat-bottomed cylindrical glass vial of 14 cm height and 16 mm diameter and then placed in the thermostatic measurement chamber. Scans were carried out hourly at 25 °C for 12 h, and the measurements were repeated three times independently. Turbiscan stability index (TSI) was calculated according to Wiśniewska, et al. [22].
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