作用力形式对不同筋力小麦粉面团水分分布、应力松弛特性及面条品质的影响
Effects of different force forms on water distribution, stress relaxation characteristics and noodle quality of wheat flour dough with different gluten strength
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摘要: 为明晰手工面条品质变化的原因,以3种不同筋力小麦粉为原料,采用和面机、传统手工、按压和擀制(分为单一方向和双向)等方式制作面团和面条,采用低场核磁共振分析仪和质构仪测定不同制作方式下面团水分分布和应力松弛特性,并分析其所制面条的品质。结果表明:外力作用对面团和面条品质具有显著影响,并因小麦品质不同而变化,其中,按压和擀制均可促进高筋小麦粉制作的面团中水分的结合,而对弱筋小麦粉制作的面团中水分向结合态转变具有不利影响;此外,手工和面导致面团黏弹性下降,抗变形能力减弱;对于高筋面粉,按压和擀制面团的黏弹性小于传统手工面团,而对于低筋面粉,按压和擀制面团的黏弹性则大于传统手工面团,对中筋面粉无显著影响;对面条品质进行分析发现,手工和面导致面条吸水率、烹煮损失率增加,面条的拉伸性能减弱,硬度、黏附性和咀嚼性降低,同时,双向按压和单一方向擀制操作均可制作出品质更好的面条。因此,手工和面时作用力形式的不同会导致面团和面条品质变化,并因小麦粉来源具有不同表现。Abstract: The process of making dough by hand allows one to feel it by touching while avoiding over-mixing, resulting in a process that is more flexible and controllable than that of making dough with a mixer. However, the complex relationship of forces involved in manual dough processing severely impedes the dough formation process. But perhaps this relationship gives the handmade wheat flour products mysterious and attractive qualities. In order to understand the characteristics of handmade noodles and dough, the flour milled by three wheat varieties (XM26, ZM30, ZM103) was used as raw materials to make dough and noodles by dough mixer, general manual, manual pressing and rolling (including one-direction pressing or rolling, and two-way pressing or rolling). The low-field nuclear magnetic resonance analyzer and texture analyzer were used to measure the moisture distribution and stress relaxation characteristics of doughs prepared in different mixing methods, and the quality of noodles was further analyzed. The results showed that the external force had a significant effect on the quality of doughs and noodles, and it changed with different wheat quality. Both pressing and rolling could promote the combination of water in dough made of strong gluten wheat flour (XM26), but had adverse effects on the transformation of water into combined state in dough made of weak gluten wheat flour (ZM103). In addition, manual dough kneading led to a decrease in the viscoelasticity of dough, and the ability of dough to resist external pressure was weakened. For XM26, the viscoelasticity of pressed and rolled dough was lower than that of traditional manual dough kneading; For ZM30, there was no obvious difference between doughs made by pressing and rolling methods; For ZM103, the viscoelasticity of pressed and rolled doughs was greater than that of traditional manual mixing dough. By analyzing the noodle quality, it was found that the traditional manual mixing led to an increase in water absorption rate and cooking loss of noodles, while a decrease in tensile properties of noodles and the hardness, adhesion and chewiness. Two-way pressing and one-way rolling resulted in a better performance in viscoelasticity of doughs and the quality of noodles. Therefore, differences in the form of forces applied during manual mixing led to variations in dough and noodle quality, with different expressions depending on the source of wheat flour.