Adsorption of cationic amylopectin on microcrystalline cellulose
Adsorption of cationic amylopectin on microcrystalline cellulose
复制标题
阳离子支链淀粉在微晶纤维素上的吸附
DOI：
10.1016/0927-7757(93)80498-4
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
B. Bijsterbosch
中科院分区：
文献类型：
--
作者：
H.G.M. van de Steeg;A. D. Keizer;M. Stuart;B. Bijsterbosch
研究了电解质浓度和pH值对微晶纤维素吸附阳离子支链淀粉的影响。等温线的伪平台中的吸附量显示出作为电解质浓度的函数的最大值。我们将这些数据与最新的聚电解质吸附理论进行了比较。吸附量随 pH 值的增加与表面电荷的增加密切相关，表明吸附物和底物之间静电引力的核心作用。然而，吸附的最大值是由两个附加效应产生的：(i) 聚合物和表面之间的非静电吸引力和 (ii) 反离子的特异性吸附。后者吸附的特异性按 Cs+> K+≈ Na+> Li+ 的顺序增加。
The effects of electrolyte concentration and pH on the adsorption of cationic amylopectin on microcrystalline cellulose were investigated. The adsorbed amount in the pseudo-plateau of the isotherm showed a maximum as a function of the electrolyte concentration. We compared the data with a recent theory on polyelectrolyte adsorption. The increase in the adsorbed amount with pH was strongly correlated with the increase in surface charge, indicating the central role of electrostatic attraction between adsorbate and substrate. However, the maximum in the adsorption results from two additional effects: (i) a non-electrostatic attraction between polymer and surface and (ii) specific adsorption of counter-ions. The specificity of the latter adsorption increases in the order Cs+> K+≈ Na+> Li+.