Abstract
The roles of panda bean protein amyloid fibrils (PDPF) in modifying the textural and rheological properties of heat-induced pea protein isolate (PPI) gels were investigated. It was found that the incorporation of PDPF significantly enhanced (p < 0.05) the strength of PPI gel. This effect was PDPF concentration-dependent and was predominantly attributable to the enhanced intermolecular interactions between PDPF and PPI through hydrogen bonds and hydrophobic interactions. Synchronously, the non-network proteins content in PPI-PDPF gels decreased from 23.6 % to 6.6 % when PDPF concentration increased from 0 to 1.50 % (w/w). Cryo-scanning electron microscopy proved that PDPF was filled in the PPI gel network leading to more compact and interconnected gel structure. However, the water holding capacity and secondary structures of PPI gel were not significantly affected. The findings of this study showed that PDPF was effective in improving the PPI gel functional quality, which provided scientific support for PDPF as a promising gel ingredient in food industrial applications.
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