In certain physicochemical conditions, the
oxidized tannins allowed to obtain a stability equivalent to that
of the PVA. The oil in water formed emulsions were up to 50% of
methyl oleate, with drop mean sizes in the micrometer range.
Emulsion stabilization appeared to be due to electrostatic repulsions
at high pH’s (pKa), and emulsion breaking was mainly
due to droplet flocculation,