Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment
Sugarcane bagasse is the major by-product of the sugarcane industry and, due to its abundant availability, it has been extensively studied for lignocellulosic bioconversion in the production of bioethanol and other value-added commercial products. In the study presented herein, a combined pretreatme...
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| Format: | Article |
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MDPI AG
2019-05-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/12/9/1703 |
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| author | Patricia Portero-Barahona Enrique Javier Carvajal-Barriga Jesús Martín-Gil Pablo Martín-Ramos |
| author_facet | Patricia Portero-Barahona Enrique Javier Carvajal-Barriga Jesús Martín-Gil Pablo Martín-Ramos |
| author_sort | Patricia Portero-Barahona |
| collection | DOAJ |
| description | Sugarcane bagasse is the major by-product of the sugarcane industry and, due to its abundant availability, it has been extensively studied for lignocellulosic bioconversion in the production of bioethanol and other value-added commercial products. In the study presented herein, a combined pretreatment using sulfolane, TiO<sub>2</sub> and alkali microwave irradiation (MW-A) was assessed for the dissolution of lignin prior to enzymatic saccharification of holocellulose. Total reducing sugars (TRS) and saccharinic acid yields were investigated. The increase in NaOH concentration up to 5% and in temperature from 120 °C to 140 °C were found to have a positive influence on both yields. While increasing the reaction time from 5 to 60 min only led to an increase in TRS yield <2%, a reaction time of 30 min almost doubled the saccharinic acids production. TRS yields and saccharinic acid production were approximately 5% and 33% higher when the sulfolane-TiO<sub>2</sub> reaction medium was used, as compared to MW-A in water, reaching up to 64.8% and 15.24 g/L of saccharinic acids, respectively. The proposed MW-A pretreatment may hold promise for industrial applications, given the good TRS yields obtained, and the associated enzyme and time/energy savings. The use of sulfolane-TiO<sub>2</sub> reaction medium is encouraged if saccharinic acids are to be recovered too. |
| first_indexed | 2024-04-11T12:37:39Z |
| format | Article |
| id | doaj.art-656e18c19d844324a5760da1b3df6b62 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T12:37:39Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-656e18c19d844324a5760da1b3df6b622022-12-22T04:23:35ZengMDPI AGEnergies1996-10732019-05-01129170310.3390/en12091703en12091703Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane PretreatmentPatricia Portero-Barahona0Enrique Javier Carvajal-Barriga1Jesús Martín-Gil2Pablo Martín-Ramos3CLQCA, Neotropical Centre for the Biomass Research, School of Biological Sciences, Pontifical Catholic University of Ecuador, Avda. 12 de Octubre 1076 y Roca, Quito 170303, EcuadorCLQCA, Neotropical Centre for the Biomass Research, School of Biological Sciences, Pontifical Catholic University of Ecuador, Avda. 12 de Octubre 1076 y Roca, Quito 170303, EcuadorAgriculture and Forestry Engineering Department, ETSIIAA, Universidad de Valladolid, Avenida de Madrid 44, 34004 Palencia, SpainEPS, Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Universidad de Zaragoza, Carretera de Cuarte, s/n, 22071 Huesca, SpainSugarcane bagasse is the major by-product of the sugarcane industry and, due to its abundant availability, it has been extensively studied for lignocellulosic bioconversion in the production of bioethanol and other value-added commercial products. In the study presented herein, a combined pretreatment using sulfolane, TiO<sub>2</sub> and alkali microwave irradiation (MW-A) was assessed for the dissolution of lignin prior to enzymatic saccharification of holocellulose. Total reducing sugars (TRS) and saccharinic acid yields were investigated. The increase in NaOH concentration up to 5% and in temperature from 120 °C to 140 °C were found to have a positive influence on both yields. While increasing the reaction time from 5 to 60 min only led to an increase in TRS yield <2%, a reaction time of 30 min almost doubled the saccharinic acids production. TRS yields and saccharinic acid production were approximately 5% and 33% higher when the sulfolane-TiO<sub>2</sub> reaction medium was used, as compared to MW-A in water, reaching up to 64.8% and 15.24 g/L of saccharinic acids, respectively. The proposed MW-A pretreatment may hold promise for industrial applications, given the good TRS yields obtained, and the associated enzyme and time/energy savings. The use of sulfolane-TiO<sub>2</sub> reaction medium is encouraged if saccharinic acids are to be recovered too.https://www.mdpi.com/1996-1073/12/9/1703enzymatic hydrolysismicrowave irradiationNaOHpretreatmentsulfolanetotal reducing sugars |
| spellingShingle | Patricia Portero-Barahona Enrique Javier Carvajal-Barriga Jesús Martín-Gil Pablo Martín-Ramos Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment Energies enzymatic hydrolysis microwave irradiation NaOH pretreatment sulfolane total reducing sugars |
| title | Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment |
| title_full | Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment |
| title_fullStr | Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment |
| title_full_unstemmed | Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment |
| title_short | Sugarcane Bagasse Hydrolysis Enhancement by Microwave-Assisted Sulfolane Pretreatment |
| title_sort | sugarcane bagasse hydrolysis enhancement by microwave assisted sulfolane pretreatment |
| topic | enzymatic hydrolysis microwave irradiation NaOH pretreatment sulfolane total reducing sugars |
| url | https://www.mdpi.com/1996-1073/12/9/1703 |
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