
144 Engineering of Polymers and Chemical Complexity
Thus, if the pH is less than the isoelectric point (pI 4.7), a protein is positively
charged, while the inner layer of polyelectrolyte microcapsules is presented as a poly-
cation, the protein molecules are distributed throughout its volume. Protein molecules
lose their charge values near the isoelectric point and are concentrated in the wall
space of the capsule due to hydrophobic interactions with a polyelectrolyte shell. If the
pH values in the range studied was located in the wall space (Figure 3). W ...