Optimizing yield and chemical compositions of dimethylsulfoxide-extracted birchwood xylan

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD
Mingquan Zhang , Jamshed Bobokalonov , Abduvali Dzhonmurodov , Zhouyang Xiang
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引用次数: 7

Abstract

Dimethylsulfoxide (DMSO) extraction is commonly used to study the chemical structures of original xylan in the plant cell wall, since the DMSO can preserve the original structure of the xylan as much as possible during the extracting process. In addition, the DMSO-extracted xylans have unique properties allowing their potential applications in emulsifying or filming materials. However, the yield of DMSO-extracted xylan is always low and the effects of different DMSO extraction conditions on the chemical compositions of xylan have not been fully studied, which greatly hinders its researches and applications. In this study, we have found that extensive delignification before DMSO extraction results in destruction of lignin-carbohydrate complex (LCC), leading to xylan yield and xylose unit content increased by up to 220% and 20%, respectively. Tert-butanol washing of the holocellulose can further increase the DMSO extracted xylan yield by ∼10%. The yield of xylan extracted by the DMSO at 80 °C for 7 h was obviously higher than that at room temperature for 3 d by 30%–40%. Thermal analysis showed that the xylans extracted at different conditions had thermal stability without obvious differences. The results indicate that the DMSO-extracted xylan with a high yield, a high purity and a high degree of acetylation can be extracted at a high delignification level, a high reaction temperature and a short reaction time. This study is of great significance for studying xylan structure-property relationships and promoting the applications of DMSO-extracted xylan.

二甲基亚砜提取桦木木聚糖的收率及化学成分优化
二甲基亚砜(Dimethylsulfoxide, DMSO)萃取法通常用于研究植物细胞壁中原始木聚糖的化学结构,因为DMSO在提取过程中可以尽可能地保留木聚糖的原始结构。此外,dmso提取的木聚糖具有独特的性能,使其在乳化或薄膜材料中具有潜在的应用前景。然而,DMSO提取木聚糖的收率一直很低,不同提取条件对木聚糖化学成分的影响也没有得到充分的研究,这极大地阻碍了其研究和应用。在本研究中,我们发现DMSO提取前的大量脱木质素作用导致木质素-碳水化合物复合物(LCC)的破坏,导致木聚糖产率和木糖单位含量分别提高了220%和20%。叔丁醇洗涤全息纤维素可以进一步提高DMSO提取木聚糖的产率~ 10%。DMSO在80℃条件下提取7 h的木聚糖得率明显高于室温条件下提取3 d的木聚糖得率30% ~ 40%。热分析表明,不同条件下提取的木聚糖热稳定性无明显差异。结果表明,在脱木质素水平高、反应温度高、反应时间短的条件下,dmso提取的木聚糖提取率高、纯度高、乙酰化程度高。该研究对研究木聚糖的构效关系,促进dmso提取木聚糖的应用具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
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