Impact of pH on the structure, interfacial and foaming properties of pea protein isolate: Investigation of the structure – Function relationship

结构功能 豌豆蛋白 化学 功能(生物学) 化学工程 生物物理学 生物化学 生物 物理 细胞生物学 工程类 粒子物理学
作者
Ines Othmeni,Romdhane Karoui,Christophe Blecker
出处
期刊:International Journal of Biological Macromolecules [Elsevier]
卷期号:278: 134818-134818
标识
DOI:10.1016/j.ijbiomac.2024.134818
摘要

This study explored the relationship between pea protein foaming properties and their structure and physicochemical properties under neutral and acidic pH. Results showed that pH modified the zeta potential, particle size and surface tension due to electrostatic changes. FT-MIR and fluorescence spectra revealed pH-induced conformational changes, exposing hydrophobic groups and increasing sulfhydryl content, promoting protein aggregation. At pH 3, the highest foaming capacity (1.273) and lowest foam expansion (6.967) were observed, associated with increased surface hydrophobicity and net charges, ideal for creating light foams with high liquid incorporation for acidic beverages or fruit-based mousses. Pea protein isolate generated stable foams with foam volume stability between 86.662 % and 94.255 %. Although neutral pH conditions showed the highest foam volume stability, their air bubbles increased in size and transitioned from spherical to polyhedral shape, suitable for visual-centric applications, like cappuccino foam and beer-head retention. Foams at pH 5 exhibited the smallest bubbles and maintained their spherical shape, enhancing drainage resistance, beneficial for whipped toppings. Strong correlations (Pearson correlation coefficient higher than 0.600) were noted between the structure, surface and foaming properties, providing crucial insights into optimizing pea protein functionality across various pH conditions, enabling the development of plant-based foamed products with tailored properties.
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