Determination of Cellulose Degree of Polymerization in Historical Papers with High Lignin Content.
Determination of Cellulose Degree of Polymerization in Historical Papers with High Lignin Content.
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DOI：
10.3390/polym13121990
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发表时间：
2021-06-17
期刊：
影响因子：
5
通讯作者：
Kralj Cigić I
中科院分区：
文献类型：
--
作者：
Malešič J;Kraševec I;Kralj Cigić I
纤维素聚合度(DP)的测定是纸张降解研究中最常用的方法之一，可通过粘度法(如平均聚合度(DPV))或尺寸排除色层(SEC)(如重量平均相对分子质量(MW))进行。由于木质素含量较高的纸张在铜乙二胺(CED)中不能溶解，如磨木纸，无法进行粘度测定；因此，需要进行前处理以使纸张随后溶解。研究了用亚氯酸钠在冰醋酸中对含磨木浆的历史纸样进行前处理，使纸样在CED中溶解，并用粘度法测定纤维素平均聚合度(DPV)。用卡伯值来估算纸浆中木质素的含量。在将Sec UV-Vis分析作为粘度测定的对比方法之前，验证了SEC UV-Vis分析方法在测定高木质素含量纸张中相对分子质量的适用性。用SEC分析了纤维素三碳酸酯(CTC)衍生物在脱木素过程中重均相对分子质量(MW)的变化。结果表明，在所研究的脱木素条件下，所选择的样品没有发生明显的解聚反应，这一点还通过离子色谱测定单糖的结果得到了证实。Sec测定的相对分子质量与DPV测定的结果具有很好的相关性，证明了在木素含量较高的历史文献中，采用亚氯酸盐/醋酸预处理后的粘度法测定纤维素的平均聚合度是合理的。
Determination of cellulose degree of polymerization (DP) is one of the most commonly used methods in paper degradation studies, performed either by a standardized method using viscometry (as average degree of polymerization (DPv)) or size-exclusion chromatography (SEC) (as weight average molecular mass (Mw)). Due to the insolubility of papers with high lignin content in cupriethylenediamine (CED), such as groundwood papers, viscometric determination is not possible; therefore, pretreatment is required to allow subsequent dissolution of the papers. In this study, the pretreatment of historical papers containing groundwood with sodium chlorite in acetic acid was investigated, which enables dissolution of the paper samples in CED and determination of the cellulose average degree of polymerization by viscometry (DPv). Kappa number was determined to estimate the lignin content in the papers. The suitability of SEC UV-VIS analysis for determination of Mw in papers with high lignin content had been verified before it was used as a comparative method for viscometry. Using SEC, changes in the weight average molecular mass (Mw) of cellulose tricarbanilate (CTC) derivative during delignification were evaluated. The results indicate that no significant depolymerization occurred in the selected samples under the studied delignification conditions, which was additionally confirmed with determination of monosaccharides by ion chromatography. The results of the Mw determinations by SEC and DPv by viscometry are in good correlation, justifying the use of viscometry after chlorite/acetic acid pretreatment to determine the cellulose average degree of polymerization in historical papers with high lignin content.
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影响因子：
4.6
作者：
Małachowska E;Dubowik M;Boruszewski P;Łojewska J;Przybysz P
通讯作者：
Przybysz P
影响因子：
4.1
作者：
Dupont, AL;Mortha, G
通讯作者：
Mortha, G
影响因子：
2.5
作者：
Brown, Natalie;Lichtblau, Dirk;Strlic, Matija
通讯作者：
Strlic, Matija
影响因子：
5.7
作者：
Lojewski, Tomasz;Zieba, Katarzyna;Lojewska, Joanna
通讯作者：
Lojewska, Joanna
影响因子：
3
作者：
EVANS, R;WALLIS, AFA
通讯作者：
WALLIS, AFA