Journal
CARBOHYDRATE POLYMERS
Volume 157, Issue -, Pages 214-225Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2016.09.091
Keywords
Hemicelluloses; Microwave-induced hydrolysis; Organic acid; Xylooligosaccharides; Response surface methodology
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Funding
- Project of State Key Laboratory of Pulp and Paper Engineering, South China University of Technology [2015ZD03, 201428]
- Program for National Natural Science Foundation of China [21576103]
- Program of Introducing Talents of Discipline to Universities [111]
- Science and Technology Planning Project of Guangdong Province [2015B020241001]
- Fundamental Research Funds for the Central Universities of SCUT [2015PT011]
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A feasible approach to produce xylooligosaccharides (XOS) using organic acids as catalysts by microwave induced hydrolysis of different hemicelluloses was developed. The effects of different acids (oxalic acid, maleic acid, citric acid and sulfuric acid), acid concentration, reaction temperature and reaction time on the hemicelluloses hydrolysis were investigated. Results demonstrated that organic acid was more beneficial to the XOS production than the conventional sulfuric acid. Higher acid concentration, higher reaction temperature and longer reaction time accelerated the further depolymerization of XOS to form monosaccharide. Response surface methodology was employed to optimize the reaction conditions (temperature and time) for the production of XOS from beechwood xylan (BX), corncob hemicelluloses (CH) and recovered hemicelluloses from the industrial waste liquor of dissolving pulp (RH), respectively. The predicted highest XOS yields were achieved to 39.31% (126.54 degrees C-7.95 min), 27.29% (120.00 degrees C-0 min), 30.32% (122.63 degrees C-15.85 min), respectively, being close to the experimental value (39.42%, 27.46% and 30.89%) from BX, CH and RH, indicating the fitted models of XOS yield were in good agreement with the experimental results. (C) 2016 Elsevier Ltd. All rights reserved.
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