KC and gelatin exhibit conventional complex coacervation due
to electrostatic interaction. The electrostatic interaction is less
temperature dependent than hydrogen bonding and hydrophobic
interaction [15], and therefore the electrostatic complex coacervate
shows a nearly constant turbidity in the temperature range
of >40 ◦C (Fig. 1c). When the temperature is below 40 ◦C, intermolecular
hydrogen bonding between KC and gelatin comes into
play, which as an attractive interaction could reinforce the existing
complex coacervation induced electrostatically. This leads to an
extensive turbidity increase, as observed in Fig. 1c.