基于管式模型的小麦面筋系统流变行为的解析

    Tube theory based analytics on the rheological behavior of wheat gluten dough

    • 摘要: 利用动态流变仪对8种小麦面筋系统的进行小形变试验,研究在振动模式下的频率扫描时,面筋系统流变学特性,从分子动力学的角度进行解析,并引入Pierre Gilles de Gennes等人的管式模型理论基础性地对面筋流变行为进行阐述。试验表明:面筋蛋白转变温度在52.6~58.5℃间;0.1~40℃间,频率扫描下,时间-温度叠加法算出20℃时表观活化能在4602.57~6511.16 J/mol间,不同样品间有较大的差异;Arrhenius模型和WLF模型在拟合面筋系统叠合曲线的效果上一致。通过SPSS分析相关性表明:在面筋蛋白转变温度下,固定频率的温度扫描的弹性模量和在不同温度下的频率扫描的弹性模量成显著的正相关;面筋蛋白的转变温度与表观活化能呈较显著的正相关。该试验结果为小麦面筋相关制品的开发提供了参考。

       

      Abstract: Small deformations of eight different wheat gluten doughs were examined by dynamic rheometer to investigate the dynamic rheological properties under frequency sweep of oscillation. Molecular dynamics based analytics was conducted with introduced Pierre Gilles de Gennes's tube theory to interpret the fundamental mechanism of rheological behavior of wheat gluten dough. The results show that transition temperatures of eight wheat gluten doughs are 52.6~58.5℃; between the temperature of 0.1℃ and 40℃, apparent activation energy, which is 4602.57~6511.16 J/mol, are calculated out according to time-temperature superposition method. Fitting in both Arrhenius and WLF modes generates the identical master curves. The correlations of parameters calculated by SPSS show that, below the transition temperatures, elastic moduli of temperature ramp with a fixed frequency of 1 Hz and elastic moduli of frequency sweep under different temperatures are significantly positively correlated; apparent activation energy and protein denaturalization temperature are considerably positively correlated. The research results provide some fundamental references for the wheat based production.

       

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