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Improvement of Xylo-oligosaccharides Content of Eucalyptus Pre-hydrolysis Liquor with Microwave-assisted Acid Treatment
  
DOI：10.11980/j.issn.0254-508X.2019.06.002
Key Words:Eucalyptus  pre-hydrolysis liquid  xylo-oligosaccharides  microwave  acid treatment
Fund Project:国家重点研发计划资助项目（2017YFB0307900）；国家自然科学基金资助项目（31670595，31770628）；泰山学者工程。
Author NameAffiliation
DONG Jiran State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China， Qilu University of Technology (Shandong Academy of Sciences)， Ji’nan， Shandong Province， 250353 
YANG Guihua* State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China， Qilu University of Technology (Shandong Academy of Sciences)， Ji’nan， Shandong Province， 250353 
JI Xingxiang State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China， Qilu University of Technology (Shandong Academy of Sciences)， Ji’nan， Shandong Province， 250353 
XU Feng State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China， Qilu University of Technology (Shandong Academy of Sciences)， Ji’nan， Shandong Province， 250353 
CHEN Jiachuan* State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp & Paper Science and Technology of Education Ministry of China， Qilu University of Technology (Shandong Academy of Sciences)， Ji’nan， Shandong Province， 250353 
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Abstract:In this work，microwave-assisted acid treatment was used to prepare xylo-oligosaccharides(XOS) from the secondary Eucalyptus pre-hydrolysis liquid(PHL) which had been treated by Ca(OH)2 and activated carbon successively. The effects of the kinds of acid， acid dosage， treatment temperature and treatment time on xylose and XOS DP2～4 contents were investigated and the prepared XOS DP2～4 were characterized. The results showed that the optimal treatment conditions were sulfuric dosage of 1.4%(based on the weight of secondary Eucalyptus PHL)， 120℃ and 20 min， the content of XOS DP2～4 of the third PHL was 9.25 g/L， increased by 38.1% compared to the secondary PHL without microwave-assisted acid treatment.Analyses of Fourier Transform infrared spectroscopy(FT-IR) and Thermo gravimetric(TGA) showed that XOS from the microwave-assisted sulfuric acid treatment process contained part of side-chains of arabinose and uronic acid，and showed a high thermal stability．
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