Emulsion stability also depends on the strength of interaction
between droplets, which is determined by the charge on their surfaces.
When this charge is sufficiently large, generally regarded as
greater than ±30 mV (Tantra et al., 2010), the droplets are prevented
from aggregating due to electrostatic repulsion between
them (Farinato et al., 2009). The astaxanthin emulsions prepared
were therefore considered electrostatically stable as the f-potential
values measured were 44 and 54 mV for both systems
(Table 1).