Green, Efficient Extraction of Bamboo Hemicellulose Using Freeze-Thaw Assisted Alkali Treatment.
Bioresource technology(2021)
摘要
The premise of high value utilization of lignocellulosic biomass is effective separation of hemicellulose. In this paper, the extraction of bamboo hemicellulose using freeze-thaw assisted alkali treatment (FAT) was studied. The effect of alkali concentration, alkali treatment time, freezing temperature, and freeze-thaw time on the main components was studied. Bamboo was frozen at -30 degrees C for 12 h, thawed at room temperature, and then treated at 75 degrees C for 90 min with 7.0% alkali. The extraction rate of hemicellulose was as high as 64.71%. The purity of hemicellulose samples using conventional AT decreased from 82.63% to 78.56%. Hemicellulose with the same yield as that of conventional alkali treatment was obtained by further reducing the alkali concentration. The purity of hemicellulose samples increased from 82.63% to 89.45%. It had a higher purity, higher molecular weight, and lower polydispersity. A new, green and efficient alkaline extraction method for hemicellulose was developed.
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关键词
Hemicellulose,Alkali extraction,Freeze thawing,Yield,Purity,Molecular weight
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