*2.3. Determination of Turbidity*

The turbidity of emulsions was measured with both a portable turbidity meter (MI 415, Milwaukee Instruments, Rocky Mount, NC, USA) and UV spectrophotometer (Carry 60, Agilent Technologies, Santa Clara, CA, USA) at different wavelengths, such as 450 and 850 nm. A 150 μL emulsion sample was diluted with 15 mL of distilled water, and the mixture was homogenized by shaking before measurements. The method of measurement with the turbidity meter is based on the detection of scattered light according to ISO 7027 [23]. Before analysis, calibration of the device was performed with the 10 and 500 Formazin Nephelometric Unit (FNU) standards provided by the manufacturer. The wavelengths were set to 450 and 800 nm for the spectrophotometric determination of turbidity.
