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Monitoring of free phenol content in lignosulfonates by ClO2 titration and UV difference spectroscopy

  • Orianne Broussard , Morgane Petit , Nicolas Elie , Stéphanie Baumberger , Alix Arnaud , Paul-Henri Ducrot EMAIL logo and Florent Allais EMAIL logo
From the journal Holzforschung


Lignosulfonates (LS) are water-soluble polyphenolic macromolecules derived from lignins and common industrial additives in plasticizers and dispersants. A key feature for a more efficient utilization of modified LS is the monitoring of their free phenol (OHphen) content during various reactions as these phenols govern a large part of their chemical reactivity. Against this background, the UV difference spectroscopy (Δεi method) and ClO2 titration have been revisited. Synthetic LS model compounds with a SO3H group on their benzylic position and H, G, and S aromatic rings were synthesized and used to assess the suitability of both the ClO2 titration and the Δεi method on LS. The methodology combining the two analytical methods was then used to determine the molar extinction coefficient of a given LS allowing the calibration of the Δεi method for a convenient and rapid monitoring of OHphen in the course of LS reactions involving the OHphen groups.

Corresponding authors: Paul-Henri Ducrot and Florent Allais, Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, RD10, 78026 Versailles Cedex, France, e-mail: (P.-H. Ducrot); , (F. Allais)


The authors thank Saint-Gobain Recherche for financial support. The authors are also grateful to Dr. Serge Ratton for fruitfull discussions.


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Received: 2015-5-11
Accepted: 2015-11-24
Published Online: 2016-1-6
Published in Print: 2016-8-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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