“…A zeta potential of about ᎐40 to ᎐100 mV generally corresponds to a stable emulsion, but experimental testing is rec-Ž . ommended Moses and Ng, 1985 . Since it is often impractical to conduct stability tests comparable in length to the product shelf life, accelerated tests, such as storage at elevated temperatures and repeated exposure to freeze-thaw cy-Ž . cles, are often used Breuer, 1983 . Conditions in commercial production can be different from the laboratory-scale experiments.…”