Analysis 1Gelatin [30, 62] 2Gelatin-A: Gelatin-B [14] 2Gelatin-A: Chitosan [11] 2Gelatin-A: Agar [13, 63] 2Gelatin-B: Agar [12] Binding type Electrostatic Electrostatic Surface selective  Electrostatic Surface selective  Transition pH values alcohol driven  at constant pH pHc ~ 5.5, pHF ~ 6.3 pHc ~ 4.5, pHF ~ 6.5-7.5 pHc ~ 5.4, pHF ~ 9 pHc ~ 7.5, pHF ~ 6 Effect of Ionic strength Yes Yes None Yes None Optical nature Opaque Opaque Opaque Semi-transparent Semi-transparent Network structure ζ = 20 nm, ξ= 1.2 nm --- ζ= 21-26 nm, ξ= 1.2  nm ζ= 22 nm, ξ =1.2 nm ζ= 3.2 nm, ξ= 1.6 nm Melting  temperature 33°C 42°C 64 °C, 87 °C 35 °C, 75 °C 75 °C Viscoelastic property Viscous Viscoelastic Viscous Viscous Viscoelastic

Legends: 1simple coacervate, 2complex coacervate, inhomogeniety length = ζ, correlation length= ξ, onset of turbidity at pHc, turbidity maximum at pHΦ.

Table 5: Comparison between various coacervates of agar and gelatin system. Reproduced with permission from American Chemical Society [12].