Micrographs of control and reduced-fat chiffon cakes prepared with a mixture of konjac/SPI/wheat flour as followed: CC1 (0.5: 5: 94.5), CC2 (0.5: 10: 89.5), CC3 (1:5: 94) and CC4 (1: 10: 89) samples are shown in Figure 1.
Overall, the control micrograph showed consistent sizes of air cells throughout the cake whereas greater sizes of inconsistent air cells were observed by SEM following each increasing of konjac flour and SPI in the cakes. The structure of reduced-fat cakes (CC1 to CC4) was more cohesive and coarse, showing gel-type structures.
Larger porous texture was evident in the cake with 1% konjac flour incorporated with 5 or 10% SPI (CC3 and CC4) whereas low concentration of konjac flour (0.5%) would promote the distribution of air cells (CC1 and CC2).