Evaluation of comprehensive on-line liquid chromatography thermally assisted hydrolysis and methylation–gas chromatography–mass spectrometry for characterization of sulfonated lignins

✍ Scribed by Stella Brudin; Erwin Kaal; Hans-Gerd Janssen; Peter Schoenmakers

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 299 KB
• Volume: 33
• Category: Article
• ISSN: 1615-9306
• DOI: 10.1002/jssc.201000512

✦ Synopsis

Abstract

Sulfonated lignins, used as dispersants in agrochemical formulations, have been characterized by hyphenation of ion‐pair RPLC and thermally assisted hydrolysis and methylation–GC–MC (THM‐GC‐MS). The chemical structure of a series of selected lignins was evaluated, both in terms of overall composition and in terms of composition as a function of molecular size. Some sulfonated lignins give rise to unstable formulations. In the compositional analysis, these samples were found to yield additional fragments. A newly developed comprehensive method made it possible to monitor the occurrence of these fragments as a function of molecular size. In addition to differences in the molecular size between “good” and “bad” batches, clear differences in chemical composition were established.