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Study on Alkaline Extraction of Hemicelluloses from Bagasse Pith with Ultrasound-assisted
  
DOI:10.11980/j.issn.0254-508X.2018.01.004
Key Words:bagasse pith  hemicellulose  ultrasonic extraction  response surface methodology
Fund Project:辽宁省博士科研启动基金项目(201601279)。
Author NameAffiliation
马志宇 大连工业大学轻工与化学工程学院,辽宁大连,116034 
吕艳娜* 大连工业大学轻工与化学工程学院,辽宁大连,116034 
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Abstract:Hemicelluloses was extracted from bagasse pith by ultrasound-assisted alkaline method. Firstly, the chemical compositions of bagasse pith were analyzed. Then, the influences of ultrasonic time, KOH mass concentration and extraction temperature on yield of bagasse pith hemicelluloses were evaluated. On the basis of single factor experiments, the extraction conditions were optimized by response surface methodology(RSM). The results showed that the optimal conditions for bagasse pith hemicelluloses extraction by ultrasound-assisted alkaline method were ultrasonic treatment time of 28 min, KOH mass concentration of 3.7%, and extraction temperature of 53℃. Under these conditions, the total extraction yield of hemicelluloses was 23.05% and it increased by 3.24 percentage points compared with the alkaline extraction without ultrasound assistance. KOH mass concentration, ultrasonic treatment time and extraction temperature were the most significant factors affecting the total hemicelluloses yield.
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