Revealing the structure and distribution changes of Eucalyptus lignin during the hydrothermal and alkaline pretreatments.

ABSTRACT: An integrated pretreatment process based on hydrothermal pretreatment (HTP) followed by alkaline pretreatment has been applied to treat Eucalyptus. The chemical composition and structure changes of lignin during the pretreatment were comprehensively characterized. The surface morphology of the cell walls and lignin distribution of the pretreated Eucalyptus were detected by scanning electron and confocal Raman microscopies. It was found that the chemical bonds between lignin and hemicelluloses were cleaved during the pretreatment. The results also indicated that the contents of β-O-4', β-β', and β-5' linkages were decreased with the increase of hydrothermal pretreatment temperature and the cleavage of β-O-4' linkages in lignin was accompanied with repolymerization reactions. ³¹P

SUBMITTER: Wang C 

PROVIDER: S-EPMC5429616 | biostudies-literature | 2017 Apr

REPOSITORIES: biostudies-literature