Unravelling the Complexity of Lignosulfonates─Fractionation and Physicochemical Profiling.

ABSTRACT: Understanding the structural architecture of lignosulfonates is essential for optimizing their performance and enabling targeted modifications for sustainable applications. This study investigates six sodium lignosulfonate fractions (2,200-78,000 g/mol; dispersity 1.7-12.2) obtained via two-step ultrafiltration. Functional group analysis (sulfonation degree, phenolic hydroxyl, and carboxylic acid) using elemental analysis and NMR revealed minimal variation across fractions. Hydrophobic interaction chromatography and intrinsic viscosity measurements showed that increasing molecular weight correlates with reduced charge-to-size ratios and enhanced hydrophobicity. Rheological data showed that high-molecular-weight fractions exhibit greater conformational changes and compaction under high ioni

SUBMITTER: Selvik VM 

PROVIDER: S-EPMC12801188 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature