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研究了低浓度白芨葡甘聚糖(BSG)溶液的流变性与多糖浓度、外加电解质浓度、pH值及温度等的相关性。结果表明,BSG水溶液在2～16g.L-1时是假塑性流体。在低剪切速率下(γ.<1s-1),溶液的表观黏度η迅速降低;剪切速率增大(γ.>1s-1),溶液的η达到稳定(ηs)。在高剪切速率下溶液的ηs随浓度的增加而增加。向溶液中加入电解质,或者改变pH值,都不会影响ηs。对质量浓度为16g.L-1的BSG溶液,升高温度,η降低,η与温度的关系符合Arrhenius方程。
The relationship between the rheological properties and the concentration of polysaccharides, the concentration of electrolytes, the pH value and the temperature of the low concentration of glucomannan (BSG) solution was studied. The results show that BSG aqueous solution at 2 ~ 16g.L-1 is a pseudoplastic fluid. At low shear rate (γ. <1s-1), the apparent viscosity η of the solution decreased rapidly; the shear rate increased (γ.> 1s-1) and the η of the solution reached a steady state (ηs). The ηs of the solution increases with increasing concentration at high shear rates. Adding electrolyte to the solution, or changing the pH, will not affect ηs. For the BSG solution with mass concentration of 16g.L-1, the increase temperature and η decrease, and the relationship between η and temperature accords with Arrhenius equation.