采用不对称流场流分离技术对阳离子马铃薯淀粉进行特性分析。离子强度和取代度的影响。
Characterisation of cationic potato starch by asymmetrical flow field-flow fractionation. Influence of ionic strength and degree of substitution.
机构信息
Division of Analytical Chemistry, Department of Chemistry, Centre for Chemistry and Chemical Engineering, Faculty of Engineering LTH, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
出版信息
Carbohydr Polym. 2014 Jun 15;106:166-71. doi: 10.1016/j.carbpol.2014.02.002. Epub 2014 Feb 18.
The properties of a paper sheet depend on the absorption together with the physico-chemical properties of additives used in the paper processing. The effect of ionic strength and degree of substitution of cationic potato starch on the elution pattern of asymmetrical flow field-flow fractionation was analysed. The effect of starch derivatisation, in either dry or wet phase, was also investigated. Average molar mass showed no difference between the starches obtained from the two derivatisation processes. Apparent densities showed that dry cationic starch had higher density than wet cationic starch for a hydrodynamic radius between 50 and 100 nm. Elution times of native and three cationic starches increased when the ionic strength increased from 50 to 100mM. No differences in the molar mass among cationic starches with different degree of substitution suggested no degradation due to a derivatisation process. Large sample loads can be used at 100mM without overloading.
纸张的性能取决于纸张加工过程中使用的添加剂的吸收能力以及物理化学性质。分析了离子强度和阳离子马铃薯淀粉取代度对不对称流场流分离洗脱模式的影响。还研究了淀粉衍生化（无论是在干燥相还是在湿相）的影响。两种衍生化过程获得的淀粉的平均摩尔质量没有差异。表观密度表明，对于水力半径在 50 至 100nm 之间的干阳离子淀粉的密度高于湿阳离子淀粉。当离子强度从 50mM 增加到 100mM 时，天然淀粉和三种阳离子淀粉的洗脱时间增加。具有不同取代度的阳离子淀粉的摩尔质量没有差异，这表明由于衍生化过程没有降解。在 100mM 时可以使用大的样品负载而不会过载。
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