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Peer-reviewedCC BY 4.0Polymers

Lignin Derivatives in Beech, Eucalyptus and Oak Wood Hydrochar: Mild Solvolysis and Characterization

  • Valeria Pierpaoli1
  • Miha Grilc2,3
  • Giorgio Tofani2
  • Blaž Likozar2
  • Edita Jasiukaitytė-Grojzdek2
  • Manuela Romagnoli1
  1. 1Department of Innovation in Biological, Agro-Food and Forest Systems (DIBAF), Tuscia University, Via San Camillo de Lellis, snc, 01100 Viterbo, Italy
  2. 2Department of Catalysis and Chemical Reaction Engineering, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
  3. 3Center of Excellence for Low Carbon Technology, Hajdrihova 19, 1000 Ljubljana, Slovenia
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Abstract

This study investigates lignin-derived fractions obtained from the hydrochars of beech (Fagus sylvatica L.), eucalyptus (Eucalyptus camaldulensis) and oak (Quercus cerris L.) following hydrothermal carbonization and mild acidolysis. The aim was to understand the structural, molecular, and thermal properties of the recovered material and to compare how botanical origin influences it. FTIR analysis revealed consistent aromatic signatures across all samples; HP-SEC revealed species-dependent differences in molecular weight distributions, although the overall molecular weight range remained comparable among species; 2D NMR further verified the lignin origin of the isolated fractions, while TGA indicated comparable thermal behaviour among the three biomasses. The whole study shows how hydrothermal carbonization followed by mild solvolysis produces lignin-derivative fractions, highlighting both the potential of this approach for lignin recovery and the need for more efficient methods to obtain higher-integrity lignin suitable for advanced material applications.

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Cite

BibTeXRIS
BibTeX
@article{pierpaoli2026lignin,
  title = {{Lignin Derivatives in Beech, Eucalyptus and Oak Wood Hydrochar: Mild Solvolysis and Characterization}},
  author = {Valeria Pierpaoli and Miha Grilc and Giorgio Tofani and Blaž Likozar and Edita Jasiukaitytė-Grojzdek and Manuela Romagnoli},
  journal = {Polymers},
  year = {2026},
  month = oct,
  doi = {10.3390/polym18202530},
  url = {https://www.mdpi.com/2073-4360/18/20/2530},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Lignin Derivatives in Beech, Eucalyptus and Oak Wood Hydrochar: Mild Solvolysis and Characterization
AU  - Valeria Pierpaoli
AU  - Miha Grilc
AU  - Giorgio Tofani
AU  - Blaž Likozar
AU  - Edita Jasiukaitytė-Grojzdek
AU  - Manuela Romagnoli
PY  - 2026
DA  - 2026/10/01
JO  - Polymers
DO  - 10.3390/polym18202530
UR  - https://www.mdpi.com/2073-4360/18/20/2530
AB  - This study investigates lignin-derived fractions obtained from the hydrochars of beech (Fagus sylvatica L.), eucalyptus (Eucalyptus camaldulensis) and oak (Quercus cerris L.) following hydrothermal carbonization and mild acidolysis. The aim was to understand the structural, molecular, and thermal properties of the recovered material and to compare how botanical origin influences it. FTIR analysis revealed consistent aromatic signatures across all samples; HP-SEC revealed species-dependent differences in molecular weight distributions, although the overall molecular weight range remained comparable among species; 2D NMR further verified the lignin origin of the isolated fractions, while TGA indicated comparable thermal behaviour among the three biomasses. The whole study shows how hydrothermal carbonization followed by mild solvolysis produces lignin-derivative fractions, highlighting both the potential of this approach for lignin recovery and the need for more efficient methods to obtain higher-integrity lignin suitable for advanced material applications.
SN  - 2073-4360
ER  -