RT Journal Article
T1 Lignin-enriched residues from bioethanol production: Chemical characterization, isocyanate functionalization and oil structuring properties
A1 Borrero López, Antonio María
A1 Valencia Barragán, Concepción
A1 Ibarra, David
A1 Franco Gómez, José María
K1 Bioethanol residue
K1 Lignin
K1 Lubricating grease
K1 NMR
K1 Oleogel
K1 Rheology
AB Lignin-enriched waste products from bioethanol production of agriculture residues were tested as structuring agents in castor oil once functionalized with hexamethylene diisocyanate. Cane bagasse, barley and wheat strawwere processed through steam explosion, pre-saccharification and simultaneous saccharification and fermentation (PSSF). Alternatively, cane bagasse was submitted to steam explosion and enzymatic hydrolysis (EH). Several Nuclear Magnetic Resonance techniques were used to characterize both residues and NCO-functionalized counterparts. The β-O-4′/resinol/phenylcoumaran content and hydroxyphenyl/guaiacyl/syringyl distribution depend on biomass source, pretreatment, and enzymatic hydrolysis. Total hydroxyl content (from 1.23 for cane bagasse to 1.85 for wheat straw residues), aromatic/aliphatic hydroxyl ratio (0.78 for cane bagasse and 0.61 and 0.49 for barley and wheat straw residues, respectively) and S/G ratio (ranging from 0.25 to 0.86) influence the NCO-functionalization and oleogel rheological response. Oleogels obtained with barley straw residues exhibited the highest values of the storage modulus; around 2 × 105 Pa and 104 Pa for 25% and 20% contents, respectively. PSSF process showed weaker modification, leading to softer viscoelastic response compared to EH. These oleogels exhibited rheological properties similar to lubricating greases of different NLGI grades. Therefore, we herein show an integrative protocol for the valorization of lignin-enriched residues from bioethanol productionas potential thickeners of lubricating greases
PB Elsevier
YR 2021
FD 2021
LK https://hdl.handle.net/10272/28574
UL https://hdl.handle.net/10272/28574
LA eng
NO A.M. Borrero-López, C. Valencia, D. Ibarra, et al., Ligninenriched residues from bioethanol production: Chemical characterization, isocyanate functionalization and oil structuring properties, International Journal of Biological Macromolecules (2021), https://doi.org/10.1016/j.ijbiomac.2021.11.185
NO This work is part of two coordinated research projects (RTI2018- 096080-B-C21 and RTI2018-096080-B-C22) funded by MCIN/AEI/10 .13039/501100011033 and by “ERDF A way of making Europe”. The financial support is gratefully acknowledged. A.M.B-L. also acknowledges the Ph.D. Research Grant FPU16/03697 from MECD (Spain).
DS Repositorio Institucional de la Universidad de Huelva
RD 2 jul 2026