Feasibility of Manufacturing Cellulose Nanocrystals from the Solid Residues of Second-Generation Ethanol Production from Sugarcane Bagasse
| Autor: | Luiz H. C. Mattoso, Sandra Pereira, Livia Arantes Camargo, Cristiane S. Farinas, José Manoel Marconcini, Ana Carolina Corrêa |
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| Rok vydání: | 2016 |
| Předmět: |
biology
010405 organic chemistry Renewable Energy Sustainability and the Environment Chemistry business.industry 02 engineering and technology Cellulase 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Nanocellulose Biotechnology chemistry.chemical_compound Chemical engineering Cellulosic ethanol Enzymatic hydrolysis biology.protein Acid hydrolysis Ethanol fuel Cellulose 0210 nano-technology Bagasse business Agronomy and Crop Science Energy (miscellaneous) |
| Zdroj: | BioEnergy Research. 9:894-906 |
| ISSN: | 1939-1242 1939-1234 |
| Popis: | The reuse of the solid residues generated in the production of second-generation (2G) ethanol to obtain high-value products is a potential strategy for improving the economic and environmental viability of the overall process. This study evaluated the feasibility of using the residual solids remaining after the enzymatic hydrolysis of sugarcane bagasse for the production of cellulose nanocrystals (CNC), a valuable bionanomaterial. To this end, sugarcane bagasse subjected to steam explosion (SEB) or liquid hot water (LHWB) pretreatment was hydrolysed using different loadings of a commercial cellulase cocktail. Samples of SEB and LHWB were hydrolysed enzymatically, resulting in glucose releases close to 40 g/L, which would be suitable for producing 2G ethanol by microbial fermentation. The solid residues after the enzymatic hydrolysis step presented cellulose contents of up to 54 %, indicating that a significant amount of recalcitrant crystalline cellulose remained available for subsequent use. These solid residues were purified and submitted to acid hydrolysis, resulting in the successful formation of CNC with crystallinity close to 80 %, lengths of 193–246 nm and diameters of 14–18 nm. The CNC produced presented morphology, dimensions, physical-chemical characteristics, thermal stability and crystallinity within the ranges reported for this type of material. Moreover, the enzyme loading or the type of hydrothermal pretreatment process employed here showed no significant effects on the CNC obtained, indicating that these variables could be flexibly adjusted according to specific interests. |
| Databáze: | OpenAIRE |
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