Specific lignin precipitation for oligosaccharides recovery from hot water wood extract

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• 作者：Xiaoqian Chen ; Zhaojiang Wang ; Yingjuan Fu ; Zongquan Li ; Menghua Qin
• 关键词：Hot water extraction ; Oligosaccharides ; Specific lignin precipitation ; Polyaluminium chloride
• 刊名：Bioresource Technology
• 出版年：January, 2014
• 年：2014
• 卷：152
• 期：Complete
• 页码：31-37
• 全文大小：1242 K

文摘

Hot water extraction is an important strategy of wood fractionation, by which the hemicelluloses can be separated for value-added products, while the residual solid can still be processed into traditional wood products. In this study, a combined process consisting of specific lignin precipitation and dialysis was proposed to recover hemicellulosic oligosaccharides (OS) from hot water extract (HWE). The results showed that polyaluminium chloride (PAC) precipitation was highly specific to large molecular lignin, leading to 25.1% lignin removal with negligible OS loss through charge neutralization mechanism. The separation was further enhanced by dialysis, reaching 37.6% OS recovery from HWE with remarkable purity of 94.1%. By the proposed process, 56.36 g OS, mainly xylooligosaccharides with two fractions of 5.2 and 0.51 kDa was recovered from one kg dried wood. This process can be envisaged as a great contribution to wood biorefinery.