Rheological behavior of natural hydrogel produced from seeds of threeSalvia spp. (S. miltiorrhiza (SM),S. sclarea (SS), S.viridis (SV)) was investigated by using a Rheometer equipped with a cone and plate geometry measuring system under never-dried condition. Different chemical contents of such hydrogels give significant effects on their rheological properties. Because of incomplete penetration of water inside the hydrogels after drying before-dried hydrogels were used for rheological analysis. To know molecular interactions which predominated in the gel formation, some constituents were externally added to the 1.0% (w/w) hydrogel. Addition of urea to disrupt hydrogen bonds reduced 3.4-67% viscosity of the untreated hydrogels and changed viscoelastic properties from gel to liquid-like behavior. Neutral salts added to the hydrogel solution at 0.1 M also lowered the viscosity in a manner related with increase in size of cations and temperature. Changing from gel state to liquid-like state was also easily confirmed by oscillation measurement (storage,G′, and loss,G′⇔’, modulii) typically observed in the cases of potassium sulfate and potassium thiocyanate. Influence of pH variation on the viscosity explained that weak alkaline condition (pH 8-9) creates a higher resistance to flow due to increasingly electrostatic repulsions between negative charges (COO^-). Importance of calcium bridges was also demonstrated by recovery of viscosity of the hydrogels by addition of calcium after acidification. The summarized results indicate that electrostatic repulsion is a major contributor for production of hydrogel structure.

中文翻译：

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盐对丹参水凝胶流变行为的影响

从三个丹参种子产生的天然水凝胶的流变行为。（S. miltiorrhiza（SM），S。sclarea（SS），S.viridis（SV））是通过使用装有锥板几何测量系统的流变仪在从未干燥的条件下进行的。这种水凝胶的不同化学含量对其流变性质产生重大影响。由于干燥后水不完全渗透到水凝胶内部，因此将干燥的水凝胶用于流变分析。为了了解在凝胶形成中占主导地位的分子相互作用，将一些成分从外部添加到1.0％（w / w）水凝胶中。加入脲以破坏氢键降低了未经处理的水凝胶的3.4-67％的粘度，并将粘弹性从凝胶行为改变为液体行为。以0.1 M加入水凝胶溶液的中性盐也以与阳离子大小和温度增加相关的方式降低了粘度。ģ '和损失，ģ '⇔”，modulii）典型地在硫酸钾和硫氰酸钾的情况下观察到的。解释说，弱碱性条件下（pH 8-9）产生更高的电阻由于流到负电荷（COO之间日益静电排斥对粘度的pH变化的影响^- ）。通过在酸化后添加钙来恢复水凝胶的粘度，也证明了钙桥的重要性。总结的结果表明静电排斥是水凝胶结构生产的主要贡献者。