2 research outputs found
Soluble Lignin Recovered from Biorefinery Pretreatment Hydrolyzate Characterized by Lignin–Carbohydrate Complexes
The lignin rendered
soluble by lignocellulosic biorefinery pretreatment
remains insufficiently understood along the lines of molecular properties
and chemical composition. To procure a representative soluble lignin
preparation, an aromatic-selective adsorptive resin was utilized.
Approximately 90% of soluble lignin could be recovered from autohydrolysis
pretreatment hydrolyzate (autohydrolyzate) produced from a hardwood
and a nonwood biomass. Adsorbate compositional characterization revealed
a befuddling magnitude of carbohydrate in selectively isolated lignin
adsorbates. Quantitative structural analysis of the lignin by NMR
suggested lignin–carbohydrate complexes (LCCs) as the cause
behind the pronounced carbohydrate contents. Analyzed spectra revealed
both hardwood and nonwood soluble lignin features of ∼10 total
LCC per 100 aromatic rings, with each lignin bearing unique LCC profiles.
In addition, native structures remained in large quantities. The improved
understanding of hydrolyzate-soluble lignin granted from this work
will aid biorefinery development by improving discourse around a biorefinery
lignin source