Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume
A surface response design was employed to develop a sodium hydroxide (NaOH) pretreatment method for Quercus variabilis Blume using low NaOH concentration at low temperature. Nevertheless, the persistent issues associated with alkaline pretreatment of lignocellulose, namely high-water consumption and...
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| Language: | English |
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North Carolina State University
2024-03-01
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| Series: | BioResources |
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| Online Access: | https://ojs.cnr.ncsu.edu/index.php/BRJ/article/view/23276 |
| _version_ | 1827323799729602560 |
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| author | Si Young Ha Ji Young Jung Hyeon Cheol Kim Woo Seok Lim Jae-Kyung Yang |
| author_facet | Si Young Ha Ji Young Jung Hyeon Cheol Kim Woo Seok Lim Jae-Kyung Yang |
| author_sort | Si Young Ha |
| collection | DOAJ |
| description | A surface response design was employed to develop a sodium hydroxide (NaOH) pretreatment method for Quercus variabilis Blume using low NaOH concentration at low temperature. Nevertheless, the persistent issues associated with alkaline pretreatment of lignocellulose, namely high-water consumption and wastewater generation, remain prevalent in this pretreatment process. To address these challenges, this study aimed to conduct enzymatic hydrolysis of NaOH-treated Q. variabilis Blume without the intermediary washing steps. The results revealed that, following pretreatment and solid-liquid separation, NaOH-treated Q. variabilis Blume could be directly subjected to cellulase-mediated hydrolysis with pH adjustment, eliminating the need for washing steps. The maximum enzymatic hydrolysis efficiency reached 95.9% under specific conditions (1.2% NaOH, 8.9 °C, 32.1 h). This approach offers a promising avenue to enhance the enzyme hydrolysis rate of NaOH-treated lignocellulose. Notably, the low-temperature and low-concentration NaOH treatment effectively removed a substantial portion of lignin and hemicelluloses, resulting in a higher crystallinity index of the cellulose-rich residue compared to substrates treated solely with steam explosion. The integration of direct pretreatment and alkaline treatment emerges as an environmentally friendly and economically viable method for producing glucose and high-purity lignin. The obtained lignin can be further transformed into high-value products within the biorefinery framework. |
| first_indexed | 2024-04-25T01:59:24Z |
| format | Article |
| id | doaj.art-39992d7a2010497fb7dd960037133b45 |
| institution | Directory Open Access Journal |
| issn | 1930-2126 |
| language | English |
| last_indexed | 2024-04-25T01:59:24Z |
| publishDate | 2024-03-01 |
| publisher | North Carolina State University |
| record_format | Article |
| series | BioResources |
| spelling | doaj.art-39992d7a2010497fb7dd960037133b452024-03-07T15:16:39ZengNorth Carolina State UniversityBioResources1930-21262024-03-01192259226081413Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis BlumeSi Young Ha0Ji Young Jung1Hyeon Cheol Kim2Woo Seok Lim3Jae-Kyung Yang4Department of Environmental Materials Science/Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of KoreaDepartment of Environmental Materials Science/Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of KoreaDepartment of Environmental Materials Science/Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of KoreaDepartment of Environmental Materials Science/Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of KoreaDepartment of Environmental Materials Science/Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of KoreaA surface response design was employed to develop a sodium hydroxide (NaOH) pretreatment method for Quercus variabilis Blume using low NaOH concentration at low temperature. Nevertheless, the persistent issues associated with alkaline pretreatment of lignocellulose, namely high-water consumption and wastewater generation, remain prevalent in this pretreatment process. To address these challenges, this study aimed to conduct enzymatic hydrolysis of NaOH-treated Q. variabilis Blume without the intermediary washing steps. The results revealed that, following pretreatment and solid-liquid separation, NaOH-treated Q. variabilis Blume could be directly subjected to cellulase-mediated hydrolysis with pH adjustment, eliminating the need for washing steps. The maximum enzymatic hydrolysis efficiency reached 95.9% under specific conditions (1.2% NaOH, 8.9 °C, 32.1 h). This approach offers a promising avenue to enhance the enzyme hydrolysis rate of NaOH-treated lignocellulose. Notably, the low-temperature and low-concentration NaOH treatment effectively removed a substantial portion of lignin and hemicelluloses, resulting in a higher crystallinity index of the cellulose-rich residue compared to substrates treated solely with steam explosion. The integration of direct pretreatment and alkaline treatment emerges as an environmentally friendly and economically viable method for producing glucose and high-purity lignin. The obtained lignin can be further transformed into high-value products within the biorefinery framework.https://ojs.cnr.ncsu.edu/index.php/BRJ/article/view/23276alkaline treatmenteco-friendly conditionenzymatic hydrolysisoaksteam explosion |
| spellingShingle | Si Young Ha Ji Young Jung Hyeon Cheol Kim Woo Seok Lim Jae-Kyung Yang Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume BioResources alkaline treatment eco-friendly condition enzymatic hydrolysis oak steam explosion |
| title | Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume |
| title_full | Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume |
| title_fullStr | Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume |
| title_full_unstemmed | Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume |
| title_short | Low-temperature and Low-concentration Sodium Hydroxide Pretreatment for Enhanced Enzyme Hydrolysis Rate from Quercus variabilis Blume |
| title_sort | low temperature and low concentration sodium hydroxide pretreatment for enhanced enzyme hydrolysis rate from quercus variabilis blume |
| topic | alkaline treatment eco-friendly condition enzymatic hydrolysis oak steam explosion |
| url | https://ojs.cnr.ncsu.edu/index.php/BRJ/article/view/23276 |
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