Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis
Biomass pre-treatment is a key step in achieving the economic competitiveness of biomass conversion. In the present work, an imidazole pre-treatment process was performed and evaluated using wheat straw and eucalyptus residues as model feedstocks for agriculture and forest-origin biomasses, respecti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-12-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/26/24/7591 |
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| author | Pedro M. A. Pereira Joana R. Bernardo Luisa Bivar Roseiro Francisco Gírio Rafał M. Łukasik |
| author_facet | Pedro M. A. Pereira Joana R. Bernardo Luisa Bivar Roseiro Francisco Gírio Rafał M. Łukasik |
| author_sort | Pedro M. A. Pereira |
| collection | DOAJ |
| description | Biomass pre-treatment is a key step in achieving the economic competitiveness of biomass conversion. In the present work, an imidazole pre-treatment process was performed and evaluated using wheat straw and eucalyptus residues as model feedstocks for agriculture and forest-origin biomasses, respectively. Results showed that imidazole is an efficient pre-treatment agent; however, better results were obtained for wheat straw due to the recalcitrant behavior of eucalyptus residues. The temperature had a stronger effect than time on wheat straw pre-treatment but at 160 °C and 4 h, similar results were obtained for cellulose and hemicellulose content from both biomasses (ca. 54% and 24%, respectively). Lignin content in the pre-treated solid was higher for eucalyptus residues (16% vs. 4%), as expected. Enzymatic hydrolysis, applied to both biomasses after different pre-treatments, revealed that results improved with increasing temperature/time for wheat straw. However, these conditions had no influence on the results for eucalyptus residues, with very low glucan to glucose enzymatic hydrolysis yield (93% for wheat straw vs. 40% for eucalyptus residues). Imidazole can therefore be considered as a suitable solvent for herbaceous biomass pre-treatment. |
| first_indexed | 2024-03-10T03:27:58Z |
| format | Article |
| id | doaj.art-0f652f7ebeb6452b8658bdd10f763092 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-10T03:27:58Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-0f652f7ebeb6452b8658bdd10f7630922023-11-23T09:46:25ZengMDPI AGMolecules1420-30492021-12-012624759110.3390/molecules26247591Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic HydrolysisPedro M. A. Pereira0Joana R. Bernardo1Luisa Bivar Roseiro2Francisco Gírio3Rafał M. Łukasik4Laboratório Nacional de Energia e Geologia, I. P., Unidade de Bioenergia e Biorrefinerias, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, PortugalLaboratório Nacional de Energia e Geologia, I. P., Unidade de Bioenergia e Biorrefinerias, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, PortugalLaboratório Nacional de Energia e Geologia, I. P., Unidade de Bioenergia e Biorrefinerias, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, PortugalLaboratório Nacional de Energia e Geologia, I. P., Unidade de Bioenergia e Biorrefinerias, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, PortugalLaboratório Nacional de Energia e Geologia, I. P., Unidade de Bioenergia e Biorrefinerias, Estrada do Paço do Lumiar 22, 1649-038 Lisbon, PortugalBiomass pre-treatment is a key step in achieving the economic competitiveness of biomass conversion. In the present work, an imidazole pre-treatment process was performed and evaluated using wheat straw and eucalyptus residues as model feedstocks for agriculture and forest-origin biomasses, respectively. Results showed that imidazole is an efficient pre-treatment agent; however, better results were obtained for wheat straw due to the recalcitrant behavior of eucalyptus residues. The temperature had a stronger effect than time on wheat straw pre-treatment but at 160 °C and 4 h, similar results were obtained for cellulose and hemicellulose content from both biomasses (ca. 54% and 24%, respectively). Lignin content in the pre-treated solid was higher for eucalyptus residues (16% vs. 4%), as expected. Enzymatic hydrolysis, applied to both biomasses after different pre-treatments, revealed that results improved with increasing temperature/time for wheat straw. However, these conditions had no influence on the results for eucalyptus residues, with very low glucan to glucose enzymatic hydrolysis yield (93% for wheat straw vs. 40% for eucalyptus residues). Imidazole can therefore be considered as a suitable solvent for herbaceous biomass pre-treatment.https://www.mdpi.com/1420-3049/26/24/7591pre-treatmentimidazolehardwoodbiomassbiorefinery |
| spellingShingle | Pedro M. A. Pereira Joana R. Bernardo Luisa Bivar Roseiro Francisco Gírio Rafał M. Łukasik Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis Molecules pre-treatment imidazole hardwood biomass biorefinery |
| title | Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis |
| title_full | Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis |
| title_fullStr | Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis |
| title_full_unstemmed | Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis |
| title_short | Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis |
| title_sort | imidazole processing of wheat straw and eucalyptus residues comparison of pre treatment conditions and their influence on enzymatic hydrolysis |
| topic | pre-treatment imidazole hardwood biomass biorefinery |
| url | https://www.mdpi.com/1420-3049/26/24/7591 |
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