Evaluation of comprehensive on-line liquid chromatography thermally assisted hydrolysis and methylation-gas chromatography-mass spectrometry for characterization of sulfonated lignins |
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Authors: | Brudin Stella Kaal Erwin Janssen Hans-Gerd Schoenmakers Peter |
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Institution: | Analytical-Chemistry/Forensic-Science Group (HIMS), University of Amsterdam, Faculty of Science, Amsterdam, The Netherlands. s.s.brudin@uva.nl |
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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. |
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