Determination of the DS distribution of non-degraded sodium carboxymethyl cellulose by gradient chromatography.

Determination of the DS distribution of non-degraded sodium carboxymethyl cellulose by gradient chromatography.
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梯度色谱法测定未降解羧甲基纤维素钠的DS分布

DOI:
10.1016/j.carbpol.2013.06.066
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发表时间:
2013
影响因子:
11.2
通讯作者:
Wolfgang Radke
Wolfgang Radke
中科院分区:
化学1区
文献类型:
--
作者:
Maryia Shakun;Thomas Heinze;Wolfgang Radke

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以微晶纤维素(Avicel样品,DP和∼)和棉短绒(BWL样品,Dp和∼(1400))为原料,用梯度液体吸附色层分析了两个系列的羧甲基纤维素钠(NaCMCs)的化学组成分布(DS分布或一级非均相)。对于两个样品系列,实现了具有不同平均DS值的样品的明显分离,从而能够确定样品的DS分布。在洗脱时观察到轻微的摩尔质量对洗脱液成分的影响。根据DS分布计算了DS标准偏差,并将其作为衡量单个样品化学不均匀程度的指标。虽然Avicels的化学异质性对平均取代度没有明显的依赖关系,但对于BWL来说,化学异质性随着平均取代度的增加而降低。
Two series of sodium carboxymethyl celluloses (NaCMCs) derived from microcrystalline cellulose (Avicel samples, DP ∼ 160) and cotton linters (BWL samples, DP ∼ 1400) with average degrees of substitution in the range DS = 0.45–1.55 were analyzed by gradient liquid adsorption chromatography (gradient LAC) in order to determine their chemical composition distributions (DS distributions or 1st order heterogeneities). Clear separations of samples having different average DS values were achieved for both sample series, allowing determination of the DS distributions of the samples. A slight molar mass influence on the eluent composition at elution was observed. From the DS distributions the DS standard deviations were calculated and taken as a measure for the extent of chemical heterogeneity of the single samples. While no noticeable dependence of the chemical heterogeneity on average DS was observed for Avicels, the heterogeneity decreases with increasing average DS for BWLs.
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