Enhancement of lignin removal from pre-hydrolysis liquor for saccharide recovery via horseradish peroxidase treatment in the presence of Ca2.

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 Macromol

authors

Wang F,Liu Q,Chen J,Li Z,Fu Y,Qin M

doi

10.1016/j.ijbiomac.2020.09.088

subject

Has Abstract

pub_date

2020-11-15 00:00:00

pages

1989-1994

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(20)34449-4

journal_volume

163

pub_type

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