Isolation of β-O-4-Rich Lignin From Birch in High Yields Enabled by Continuous-Flow Supercritical Water Treatment.

ABSTRACT: The continuous flow supercritical water (scH₂O) treatment of Birch wood (T=372-382 °C; t=0.3-0.7 s; p=260 bar) followed by alkali extraction of lignin allowed for the isolation of lignin and lignin carbohydrate complexes (LCCs) with a high number of β-O-4 moieties in the range 29-57/100 Ar (evaluated by quantitative ¹³C NMR analysis) in yields ranging between 13-19 wt % with respect to the initial wood. A "lightning rod effect" of carbohydrates has been claimed to explain the low degradation of β-O-4 bonds during the process. The structure of the isolated lignin was thoroughly elucidated via comprehensive NMR studies (HSQC, ¹³C and ³¹P). A low degree of condensation (DC)<5 % was found for all the lignin samples, which was only slightly dependent

SUBMITTER: Rigo D 

PROVIDER: S-EPMC11696213 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature