Figure 4: SEM images of different Starch + Glycerol matrices showing the fractured surfaces after tensile test- (a): Corn starch showing a remarkable smooth crack surface with increasing roughness near voids; (b): Cassava starch, arrows showing homogeneous and smooth surface; (c): Castor oil cake based with arrows showing cracks; (d): Mango puree [21,25,32,35].