Crowther R S, Marriott C, James S L
Biorheology. 1984;21(1-2):253-63. doi: 10.3233/bir-1984-211-227.
The effects of mono-, di- and trivalent ions on the rheological properties of a purified mucus glycoprotein gel have been investigated. Monovalent ions increased the fluidity of the gels in a concentration dependent manner. The effect of calcium was pH dependent; at neutral pH values this ion produced a maximum in the gel viscoelasticity at a concentration of 0.5 mM, whilst at pH 5.0 the increase in viscoelasticity was sustained up to 3.0 mM. The same concentrations of copper (II) at pH 5.0 had a similar but greater effect on the viscoelasticity. Al3+ at pH 3.0 increased the viscoelastic moduli throughout the range studied (0.1-2.0 mM), whereas iron made the gels more fluid at low concentrations, but increased the viscoelasticity to above control values at a concentration of 2.0 mM.
研究了单价、二价和三价离子对纯化的黏液糖蛋白凝胶流变学特性的影响。单价离子以浓度依赖的方式增加凝胶的流动性。钙的作用取决于pH值；在中性pH值下，该离子在浓度为0.5 mM时使凝胶粘弹性达到最大值，而在pH 5.0时，粘弹性的增加可持续到3.0 mM。在pH 5.0时，相同浓度的铜（II）对粘弹性有类似但更大的影响。在pH 3.0时，Al3+在整个研究浓度范围（0.1 - 2.0 mM）内增加了粘弹性模量，而铁在低浓度时使凝胶更具流动性，但在浓度为2.0 mM时将粘弹性提高到高于对照值。
