半纤维素
化学
产量(工程)
生物量(生态学)
益生元
木质素
食品科学
化学工程
有机化学
材料科学
农学
冶金
生物
工程类
作者
Javier Remón,Tianzong Li,Christopher J. Chuck,Avtar S. Matharu,James H. Clark
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2019-09-20
卷期号:7 (19): 16160-16172
被引量:26
标识
DOI:10.1021/acssuschemeng.9b03096
摘要
Xylooligosaccharides (XOS) produced from biomass offer a plethora of excellent physicochemical and physiological properties to be used as natural prebiotic nutraceuticals. Herein, this work first addresses and optimizes a novel one-pot, additive-free, microwave-assisted process to produce high purity XOS from beech wood hemicellulose, studying the influence of the temperature, reaction time, and solid loading. These variables exerted a significant influence, allowing the transformation of hemicellulose into a gas (0–19%), an XOS-rich liquid product (9–80%) and a spent solid material (17–90%). The liquid phase consisted of a mixture of XOS with a degree of polymerization (DP) DP > 6 (75–100 C-wt %) and DP 3–6 (0–10 C-wt %), together with mono/disaccharides (0–1 C-wt %), carboxylic acids (0–5 C-wt %), ketones (0–12 C-wt %) and furans (0–12 C-wt %). A good compromise between the liquid yield (81%) and XOS purity (96 C-wt %) was achieved at 172 °C using a solid loading of 5 wt % for 47 min. This time could be reduced (33 min) and the solid loading increased (25 wt %) without substantially altering the XOS (98 C-wt %) purity, although the liquid yield was reduced. The liquid yield could be increased up to 97% at the expenses of XOS purity (90 C-wt %) at 177 °C using a 5 wt % solid loading for 60 min. For these optima, the microwave production costs shifted between 1.42 and 6.50 €/kg XOS, which is substantially lower than the XOS market price, thus highlighting the high potential of this emerging technology.
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