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Development and characterization of fibrous high moisture extrudates based on pea protein isolate and whey protein
Jie Zhang1,2,3,4, Jingyi Yuan1,2,3,4, Xunze Han1,2,3,4
1College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.
Background:
Construction of meat analogs based on pea protein isolate (PPI) alone by high moisture extrusion (HME) is diffocult as a result of the lack of anisotropic structures. In the present study, 0%-15% of whey protein (WP) was introduced to PPI to make hybrid blends, which were used to construct HME extrudates.
Results:
WP enhanced the hardness, adhesive, cohesiveness and gumminess of the extrudates and facilitated the formation of a distinct anisotropic structure of PPI. The fibrous degrees of the extrudates containing 10% and 15% WP were around 1.50. The addition of WP, which has more -SH groups, increased the disulfide bonds and hydrogen bonding in the extrudates, leading to a denser cross-linked structure. Particle size distribution and Fourier transform infrared analysis showed that WP induced more compact structured aggregates and more β-sheet structures in the extrudates. Furthermore, the higher hydration capacity of WP may also help form a dilute melt and generate a more pronounced plug flow, assisting the formation of fiber structures of PPI.
Conclusion:
The present study demonstrates that WP is a potential modifier, which could be used to improve the structure of PPI-based meat analogs. © 2024 Society of Chemical Industry.
