Viscometric determination of dialdehyde content in periodate oxycellulose. Part I. Methodology
Viscometric determination of dialdehyde content in periodate oxycellulose. Part I. Methodology
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DOI：
10.1023/b:cell.0000014766.31671.8d
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发表时间：
2004-03-01
期刊：
影响因子：
5.7
通讯作者：
Pedemonte, E
中科院分区：
文献类型：
--
作者：
Calvini, P;Conio, G;Pedemonte, E
高碘酸氧化纤维素进行碱性水解，在室温下，在均相（乙二胺铜）和非均相（氢氧化钠）介质中，降解动力学进行了近三个月。通过比较所得到的结果与水解纤维素和高碘酸氧化纤维素的降解动力学与叔丁胺硼烷减少，它表明，氧化位点的β-烷氧基片段化是一个非常快的反应，达到完整的粘度分析样品的制备过程中。随后的降解是由于其他机制，如自氧化和剥离。高碘酸氧化纤维素还原前后的聚合度之间的比较允许定量测定二醛基，而不受还原端基的干扰。虽然这种技术可能不适用于其他类型的氧化纤维素，它提供了一个简单，快速的方法分析轻度氧化纤维素。
Periodate oxycellulose was subjected to alkaline hydrolysis at room temperature in both homogeneous (cupriethylenediamine) and heterogeneous ( sodium hydroxide) medium, and the degradation kinetics was followed for nearly three months. By comparing the obtained results with the degradation kinetics of both hydrocellulose and periodate oxycellulose reduced with tert-butylamine borane, it was demonstrated that the beta-alkoxy fragmentation of oxidised sites is a very fast reaction, which reaches completeness during the preparation of samples for viscometric analyses. The subsequent degradation is due to other mechanisms, such as autoxidation and peeling. A comparison between the degrees of polymerisation of periodate oxycellulose before and after its reduction allows the quantitative determination of dialdehyde groups, without the interference of reducing end groups. Although this technique might not be valid for other kinds of oxycellulose, it supplies a simple and fast method for the analysis of mildly oxidised cellulose.