Syneresis är troligen den skyldige här:
the extraction or expulsion of a liquid from a gel, as when serum drains from a contracting clot of blood. Another example of syneresis is the collection of whey on the surface of yogurt. Syneresis can also be observed when the amount of diluent in a swollen polymer exceeds the solubility limit as the temperature changes.
Lägga till en polysackarid som xantangummi eller guargummi hjälper till. Du ser dem i ingredienslistorna på många kommersiella dressingar, yoghurt etc.