Three-dimensional porous fibrous structural morphology changes of high-moisture extruded soy protein under the effect of moisture content

文献类型： 外文期刊

第一作者： Hu, Anna

作者： Hu, Anna;Zhou, Huan;Guo, Feng;Wang, Qiang;Zhang, Jinchuang

作者机构：

关键词： High-moisture extrusion; Soy protein concentrate; Moisture content; Porous fibrous structure; Three-dimensional structural features; Water characteristics

期刊名称：FOOD HYDROCOLLOIDS （ 影响因子：12.4； 五年影响因子：13.3 ）

ISSN： 0268-005X

年卷期： 2025 年 159 卷

页码：

收录情况： SCI

摘要： Water plays a key role for regulating the textural properties of protein fibrous and porous structure formed during the high-moisture (above 40%) extrusion process, which would further affect the taste of plant-based meat substitutes. In this study, soy protein concentrate (SPC) was selected to prepare the protein porous fibrous structure through high-moisture extrusion with the moisture content ranging from 50% to 70%, by evaluating the response of temperature, pressure, and specific mechanical energy (SME) simultaneously. The three-dimensional (3D) structural morphology features of the extrudates were systematically characterized and compared considering the color, texture, density, macro- and micro-structure and interaction with water. Results showed porous structure with different scales existed in all extrudates under varied moisture content. Obviously, the hardness, chewability, shear force, tensile resistant force and tensile distance gradually decreased with the increase of moisture content. It was found that the higher the moisture content, the worse the protein molecular orientation along the extrusion direction, resulting in a less-texturized uniform structure. Moreover, under the higher moisture content, the protein skeleton in the extrudate was thinner with larger pores. Water characteristics analysis showed that increasing the moisture content could disrupt the binding between protein structure and water, which was not conducive to water retention and more water dispersed around the surface of crosslinked protein structure. This study would be helpful for the design of protein porous fibrous structure through high-moisture extrusion toward the plant-based meat substitute development.

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