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Analytical and Bioanalytical Chemistry

, Volume 373, Issue 3, pp 174–182 | Cite as

Use of a NICA–Donnan approach for analysis of proton binding to a lignocellulosic substrate extracted from wheat bran

  • J. Bouanda
  • L. Dupont
  • J. Dumonceau
  • M. Aplincourt
Original Paper

Abstract

The acid–base properties of a lignocellulosic substrate extracted from wheat bran have been investigated. The lignocellulosic substrate was first studied by use of FTIR, XPS, and solid-state 13C NMR to characterize the surface-active groups. Major contributions arise from the presence of carboxylic and phenolic sites. The former are associated with long-chain fatty acids and the latter are constituent units of lignin. All ionizable sites were quantified by use of the Ca-acetate method and by potentiometric titrations in non-aqueous media. Results were compared with those from conductimetric titrations in water and in the presence of barium ions. Protometric titration curves for the lignocellulosic substrate were obtained at several ionic strengths. Data were also treated with the NICA–Donnan model to determine the intrinsic ionization parameters.

Wheat bran Characterization Acid–base properties NICA–Donnan model Affinity distribution 

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Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • J. Bouanda
    • 1
  • L. Dupont
    • 1
  • J. Dumonceau
    • 1
  • M. Aplincourt
    • 1
  1. 1.GRECI (Groupe de Recherche en Chimie Inorganique)Université de Reims Champagne-ArdenneReims Cedex 2France

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