高水分植物组织蛋白纤维断裂强度变化机理研究

    Study on the mechanism of change in fracture strength of high moisture plant textured protein fibers

    • 摘要: 为探究高水分植物组织蛋白(HMTVP)纤维断裂强度变化的机理,采用不同淀粉添加量和螺杆转速,经双螺杆挤压机制备HMTVP。通过分析HMTVP的微观结构、化学键、分子间作用力、蛋白质二级结构的变化,揭示影响其纤维断裂强度的关键因素。结果表明:随着淀粉添加量和螺杆转速的增加,HMTVP纤维的断裂强度均呈现先减小后上升的趋势,最小值分别为0.70 N(7.5%)和0.73 N(280 r/min);游离巯基和二硫键含量的变化与纤维断裂强度密切相关;随着螺杆转速与淀粉含量的升高,HMTVP的β-折叠占比增加了12%以上,而β-转角占比减少了19%左右,表明蛋白质分子结构从无序向有序转变;通过Logistic函数拟合,建立了分子间作用力或化学键与HMTVP断裂强度之间的关系模型。为精准调控淀粉添加量与螺杆转速的工艺提供了理论支撑,为开发具有类肉纤维强度的HMTVP制品提供了理论依据。

       

      Abstract: In order to investigate the mechanism of changes in the breaking strength of high-moisture textured vegetable protein (HMTVP) fibers, HMTVP was prepared in this study by a twin-screw extruder using different starch additions and screw speeds. The key factors affecting the fiber strength were revealed by analyzing the changes in the microstructure, chemical bonding, intermolecular forces, and the secondary structure of proteins in HMTVP. The results showed that the fiber strength of HMTVP showed a tendency of decreasing and then increasing with the increase of starch addition and screw speed, with the minimum values of 0.70 N (7.5%) and 0.73 N (280 r·min-1), respectively. The changes of free sulfhydryl and disulfide bond contents were closely related to the fiber strength. With the increase of screw speed and starch content, the percentage of β-folding of HMTVP increased by more than 12%, while the percentage of β-turning angle decreased by about 19%, indicating that the molecular structure of the protein was transformed from disorder to order. The relationship model between intermolecular forces or chemical bonds and the fiber strength of HMTVP was established by logistic function fitting. It provides theoretical support for the precise regulation of the process of starch addition and screw speed, and provides a theoretical basis for the development of HMTVP products with meat-like fiber strength.

       

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