Antonov and Gonc¸ alves [10] reported that the complexes were
formed and stabilized via electrostatic interactions, rather than
through hydrogen bonding or hydrophobic interaction by checking
the dissociation effect of salts. In their work, the turbidity of
gelatin/KC with high mixing ratio did not change on cooling from
50 ◦C to 20 ◦C, which was thought to be an evidence of insignifi-
cant influence of hydrogen bonding and hydrophobic interaction
in complexation. However, there are some arguments that electrostatic
interaction is an essential but not always a sufficient
condition for the complex formation [10]. Intra- and inter- molecular
hydrogen bonding, hydrophobic interactions can be affected by
electrostatic interaction or other long range molecular forces [15].