Abstract
This study investigated the interfacial shear rheology of mixed Quillaja saponin - pea protein systems to better understand their interactions and adsorption behaviors over time (5–720min). The interfacial storage (Gi′) and loss (Gi″) moduli of the individual and mixed surfactants were recorded as amplitude sweeps (0.05Hz, strain 1–100%) using a rheometer equipped with a biconical disk. Quillaja saponins formed highly viscoelastic interfaces within 5min. Pea proteins formed less viscoelastic interfacial layers within 5–240min, and led viscoelasticities increase greatly after 720min of aging. This is indicative of much slower rearrangement processes compared to a rapid establishment of Quillaja saponin interfacial layers. Quillaja saponin - pea protein mixtures had lower Gi′- than Gi″-values than either of the individual. This mixed interface weakened upon aging which was suggested to be indicative of the development of particulates unable to interlink thereby decreasing the interfacial cohesion.
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