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首页> 外文期刊>Journal of Polymers and the Environment >Microwave Assisted Short-Time Alkaline Extraction of Birch Xylan
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Microwave Assisted Short-Time Alkaline Extraction of Birch Xylan

机译：微波辅助桦木聚糖的短时碱性提取

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摘要

Efficacy of microwave energy for the extraction of xylan from birch wood as an alternative to conventional method of extraction was investigated. Effect of irradiation time and microwave power input on the solu-bilization of wood and yield of extracted xylan was studied. The maximum yield of xylan obtained at the higher power level was significantly lesser compared to the lower power level indicating the molecular degradation of the polymer. The highest yield of xylan (60 % of the original xylan) was obtained at the lowest power level studied, 110 W, for an irradiation time of 10 min. Comparison with conventional extraction showed that 10 min of microwave extraction provided a similar wood dissolution to that at 90 ℃ for 1.5 h, but with a higher yield of xylan. Characterization of the precipitated xylan indicated that the extracted xylan contained 68-88 % of xylose with the major chemical structure consisting of a linear backbone of (1-4) P-D-xylopyransoyl residues. Molecular mass of the extracted xylan indicated that the xylan extracted using microwave contained 60-70 % of high molecular weight fraction, and about 30-40 % of low molecular weight fraction, whereas xylan extracted using conventional method showed a reverse trend. Molecular mass of non-aggregated xylan was reported to be 6,000 Da (in terms of dextran equivalents). Crystallinity of wood fibers increased irrespective of the method of extraction indicating no degradation of the strength of the fibers occurred during the extraction.
机译：研究了微波能替代桦木提取木聚糖的传统方法的功效。研究了辐照时间和微波功率输入对木材的增溶和提取木聚糖产量的影响。与较低功率水平相比，在较高功率水平下获得的木聚糖的最大收率明显更低，这表明聚合物的分子降解。在研究的最低功率水平110 W下，辐照时间为10分钟，可获得最高的木聚糖产率（原始木聚糖的60％）。与常规提取的比较表明，微波提取10分钟可提供与90℃下1.5 h相似的木材溶解度，但木聚糖产率更高。沉淀的木聚糖的特征表明，提取的木聚糖含有68-88％的木糖，其主要化学结构由（1-4）P-D-木吡喃糖基残基的线性骨架组成。提取的木聚糖的分子量表明，用微波提取的木聚糖含有60-70％的高分子量部分，约30-40％的低分子量部分，而使用常规方法提取的木聚糖则显示出相反的趋势。据报道，未聚集的木聚糖的分子量为6,000 Da（以葡聚糖当量计）。与提取方法无关，木纤维的结晶度均增加，这表明在提取过程中不会发生纤维强度的下降。

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  • 来源
    《Journal of Polymers and the Environment》 |2013年第4期|917-929|共13页
  • 作者

    Suhara Panthapulakkal; Viktoriya Pakharenko; Mohini Sain;

  • 作者单位

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S3E5, Canada,Faculty of Forestry, Center for Biomaterials and Biocomposites Processing, University of Toronto, 33 Willcocks Street, Toronto, ON M5S3B3, Canada;

    Faculty of Forestry, Center for Biomaterials and Biocomposites Processing, University of Toronto, 33 Willcocks Street, Toronto, ON M5S3B3, Canada;

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S3E5, Canada,Faculty of Forestry, Center for Biomaterials and Biocomposites Processing, University of Toronto, 33 Willcocks Street, Toronto, ON M5S3B3, Canada;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Xylan; Microwave-assisted extraction; Hemicelluloses; Biopolymer;

    机译：木聚糖;微波辅助萃取;半纤维素;生物聚合物;

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