Structure‐mechanical properties of heat‐induced whey protein isolate/cassava starch (WPI/CS) gels were studied by hot‐stage video microscopy (HSVM) and axial compression testing (ACT). Elastic moduli (or compression stress) of pure WPI and CS gels followed a power dependence with concentration. ACT confirmed that reinforcement occurred when CS was added at 10–25% of total solids. HSVM revealed that CS granules swelled first, removed water from the system and concentrated the WPI solution that gelled later. Reinforced gels had a continuous WPI phase filled with swollen CS granules. A modified Takayanagi model accounting for water redistribution during gelatinization accurately fitted the mechanical properties of these gels.
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Aguilera et al. (1997) studied this question.
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