亚氯酸盐预处理杉木细胞壁木质素溶解机理研究

doi:10.3969/j.issn.0253-2417.2017.03.005

Abstract

Abstract: Chlorite pretreatment can selectively remove lignin of cell walls and release cellulose and hemicellulose, which can provide the potential for converting to energy resource, chemical products and biomaterials. In order to study the mechanism of delignification, the dynamic changes of lignin distribution and content in Cunninghamia lanceolata (Lamb.) Hook (Chinese fir) cell walls during chlorite pretreatment were investigated by confocal Raman microscopy (CRM) and ultraviolet spectroscopy. The results showed that the lignin dissolution during the chlorite pretreatment could be clearly divided into four stages:slight removal of lignin (Ⅰ),slow penetration of liquid (Ⅱ), rapid dissolution of lignin (Ⅲ), and the equilibrium phase of delignification (Ⅳ). Although the lignin distributed distinctly in morphological regions,i.e.,cell corner(CC), compound middle lamella(CML), and secondary wall(SW), the distributions were inhomogeneous. Therefore, the removal rates in these areas were different and followed the decreasing order of cell corner > compound middle lamella > secondary wall.

Key words: Chinese fir, chlorite pretreatment, confocal Raman microscopy, lignin, dissolution

CLC Number:

TQ35

WU Boshi, ZHANG Xun, YANG Jun, XU Feng. Dissolution Mechanism of Lignin in Chinese-fir Cell Walls During Chlorite Pretreatment[J]. Chemistry and Industry of Forest Products, 2017, 37(3): 38-44.

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Dissolution Mechanism of Lignin in Chinese-fir Cell Walls During Chlorite Pretreatment

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