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Related Experiment Video

Updated: Feb 28, 2026

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Chemical Characterization of Alkali Lignins Isolated from Rapeseed Stalks.

Bogdan-Marian Tofanica1, Elena Ungureanu1, Emanuela Callone2

  • 1"Ion Ionescu de la Brad" Iasi University of Life Sciences, 3 Mihail Sadoveanu Alley, 700490 Iasi, Romania.

Polymers
|February 27, 2026
PubMed
Summary
This summary is machine-generated.

Alkali lignins from rapeseed stalks were characterized using Kraft and Soda-Anthraquinone pulping methods. The Soda-AQ process offers a sulfur-free, environmentally cleaner alternative for valorizing agricultural waste into valuable lignin products.

Keywords:
kraft pulpingmolecular weight distributionnon-woody biomassrapeseed ligninsoda-anthraquinone pulpingtechnical lignin

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Area of Science:

  • Biomass valorization
  • Pulp and paper industry
  • Green chemistry

Background:

  • Rapeseed stalks (Brassica napus) are abundant agricultural residues.
  • Non-woody biomass is a sustainable alternative for pulp and paper production.
  • Lignin valorization is key to biorefinery development.

Purpose of the Study:

  • To chemically and structurally characterize alkali lignins from rapeseed stalks.
  • To compare lignin properties obtained via Kraft and Soda-Anthraquinone (Soda-AQ) pulping.
  • To assess the influence of pulping conditions on lignin structure and reactivity.

Main Methods:

  • Isolation of alkali lignins from black liquors of rapeseed stalk pulping.
  • Characterization using Gel Permeation Chromatography (GPC).
  • Solid-State Cross-Polarization/Magic-Angle-Spinning Nuclear Magnetic Resonance (SSCP/MAS NMR).
  • Fourier-Transform Infrared (FT-IR) and UV-Vis Spectroscopy.

Main Results:

  • Detailed chemical and structural data of lignins isolated from Kraft and Soda-AQ processes.
  • Analysis revealed differences in fragmentation degree and reactivity based on pulping method.
  • The Soda-AQ process demonstrated effective delignification without sulfur emissions.

Conclusions:

  • Both Kraft and Soda-AQ processes yield lignins suitable for high-value applications.
  • The Soda-AQ method is an environmentally superior alternative for rapeseed stalk delignification.
  • This research supports the complete valorization of rapeseed agricultural waste through lignin recovery.