Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR
Lignin-rich residues from the cellulose-based industry are traditionally incinerated for internal energy use. The future biorefineries that convert cellulosic biomass into biofuels will generate more lignin than necessary for internal energy use, and therefore value-added products from lignin could...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2015/314891 |
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| author | José I. Santos Raquel Martín-Sampedro Úrsula Fillat José M. Oliva María J. Negro Mercedes Ballesteros María E. Eugenio David Ibarra |
| author_facet | José I. Santos Raquel Martín-Sampedro Úrsula Fillat José M. Oliva María J. Negro Mercedes Ballesteros María E. Eugenio David Ibarra |
| author_sort | José I. Santos |
| collection | DOAJ |
| description | Lignin-rich residues from the cellulose-based industry are traditionally incinerated for internal energy use. The future biorefineries that convert cellulosic biomass into biofuels will generate more lignin than necessary for internal energy use, and therefore value-added products from lignin could be produced. In this context, a good understanding of lignin is necessary prior to its valorization. The present study focused on the characterization of lignin-rich residues from biochemical ethanol production, including steam explosion, saccharification, and fermentation, of wheat straw and olive tree pruning. In addition to the composition and purity, the lignin structures (S/G ratio, interunit linkages) were investigated by spectroscopy techniques such as FTIR and 2D-NMR. Together with the high lignin content, both residues contained significant amounts of carbohydrates, mainly glucose and protein. Wheat straw lignin showed a very low S/G ratio associated with p-hydroxycinnamates (p-coumarate and ferulate), whereas a strong predominance of S over G units was observed for olive tree pruning lignin. The main interunit linkages present in both lignins were β-O-4′ ethers followed by resinols and phenylcoumarans. These structural characteristics determine the use of these lignins in respect to their valorization. |
| format | Article |
| id | doaj-art-32c8c54e9dec47f399c9a90086d63e7d |
| institution | OA Journals |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-32c8c54e9dec47f399c9a90086d63e7d2025-08-20T02:24:19ZengWileyInternational Journal of Polymer Science1687-94221687-94302015-01-01201510.1155/2015/314891314891Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMRJosé I. Santos0Raquel Martín-Sampedro1Úrsula Fillat2José M. Oliva3María J. Negro4Mercedes Ballesteros5María E. Eugenio6David Ibarra7NMR Facility of Research (SGIker), Joxe Mari Korta Center, University of the Basque Country (UPV/EHU), Avenida Tolosa 72, 20018 San Sebastián, SpainINIA-CIFOR, Forestry Products Department, Cellulose and Paper Laboratories, Ctra de la Coruña Km 7.5, 28040 Madrid, SpainINIA-CIFOR, Forestry Products Department, Cellulose and Paper Laboratories, Ctra de la Coruña Km 7.5, 28040 Madrid, SpainCIEMAT, Renewable Energy Division, Biofuels Unit, Avenida Complutense 40, 28040 Madrid, SpainCIEMAT, Renewable Energy Division, Biofuels Unit, Avenida Complutense 40, 28040 Madrid, SpainCIEMAT, Renewable Energy Division, Biofuels Unit, Avenida Complutense 40, 28040 Madrid, SpainINIA-CIFOR, Forestry Products Department, Cellulose and Paper Laboratories, Ctra de la Coruña Km 7.5, 28040 Madrid, SpainINIA-CIFOR, Forestry Products Department, Cellulose and Paper Laboratories, Ctra de la Coruña Km 7.5, 28040 Madrid, SpainLignin-rich residues from the cellulose-based industry are traditionally incinerated for internal energy use. The future biorefineries that convert cellulosic biomass into biofuels will generate more lignin than necessary for internal energy use, and therefore value-added products from lignin could be produced. In this context, a good understanding of lignin is necessary prior to its valorization. The present study focused on the characterization of lignin-rich residues from biochemical ethanol production, including steam explosion, saccharification, and fermentation, of wheat straw and olive tree pruning. In addition to the composition and purity, the lignin structures (S/G ratio, interunit linkages) were investigated by spectroscopy techniques such as FTIR and 2D-NMR. Together with the high lignin content, both residues contained significant amounts of carbohydrates, mainly glucose and protein. Wheat straw lignin showed a very low S/G ratio associated with p-hydroxycinnamates (p-coumarate and ferulate), whereas a strong predominance of S over G units was observed for olive tree pruning lignin. The main interunit linkages present in both lignins were β-O-4′ ethers followed by resinols and phenylcoumarans. These structural characteristics determine the use of these lignins in respect to their valorization.http://dx.doi.org/10.1155/2015/314891 |
| spellingShingle | José I. Santos Raquel Martín-Sampedro Úrsula Fillat José M. Oliva María J. Negro Mercedes Ballesteros María E. Eugenio David Ibarra Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR International Journal of Polymer Science |
| title | Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR |
| title_full | Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR |
| title_fullStr | Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR |
| title_full_unstemmed | Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR |
| title_short | Evaluating Lignin-Rich Residues from Biochemical Ethanol Production of Wheat Straw and Olive Tree Pruning by FTIR and 2D-NMR |
| title_sort | evaluating lignin rich residues from biochemical ethanol production of wheat straw and olive tree pruning by ftir and 2d nmr |
| url | http://dx.doi.org/10.1155/2015/314891 |
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