Effects of pH conditions and thermal treatment on the size (A and B), PDI (C and D), and zeta potential (E and F) on two formulations.
In each figure, the statistical differences
among samples prepared different pH conditions were indicated by the letters in upper (before heating), lower (after heating) cases and letter with prime (after heating and
addition of salts, final products), respectively.
For samples prepared under the same pH condition, the statistical difference was noted with “*”. The statistical difference level was set
at p < 0.05.