Abstract:
:The removal of lignin is important to the recovery of saccharides from the pre-hydrolysis liquor (PHL) in kraft-based dissolved pulp production. A one-step process for lignin removal from PHL via treatment with horseradish peroxidase (HRP) in the presence of Ca2+ was proposed, and its principle was studied. The results demonstrated synergy between HRP and Ca2+ in lignin removal from PHL, whereas NH4+ had little effect on lignin removal. HRP treatment in the presence of 60 mmol/L of Ca2+ resulted in a lignin removal of 64.8% accompanied by a saccharide loss of 14.2%. HRP catalyzed both the polymerization and depolymerization of the lignin in the PHL. The HRP-catalyzed lignin polymerization rendered some lignin insoluble enabling it to be directly removed. The HRP-catalyzed depolymerization of lignin decreased its molecular weight with an evident increase in its carboxyl content. The insoluble complexes formed between the lignin with carboxyl and the Ca2+ facilitated the removal of the depolymerized lignin.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Wang F,Liu Q,Chen J,Li Z,Fu Y,Qin Mdoi
10.1016/j.ijbiomac.2020.09.088subject
Has Abstractpub_date
2020-11-15 00:00:00pages
1989-1994eissn
0141-8130issn
1879-0003pii
S0141-8130(20)34449-4journal_volume
163pub_type
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