Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue
This study proposes an efficient strategy for co-producing high-value-added xylooligosaccharides (XOS) and humic-like acid (HLA) from vinegar residue based on two-step hydrothermal pretreatments. During the first-step hydrothermal pretreatment (170 °C, 50 min), 29.1% of XOS (X<sub>2</sub>...
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MDPI AG
2023-06-01
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| Series: | Fermentation |
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| Online Access: | https://www.mdpi.com/2311-5637/9/7/589 |
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| author | Ningxin Jiao Yuanyuan Zhu Haoran Li Yongjian Yu Yong Xu Junjun Zhu |
| author_facet | Ningxin Jiao Yuanyuan Zhu Haoran Li Yongjian Yu Yong Xu Junjun Zhu |
| author_sort | Ningxin Jiao |
| collection | DOAJ |
| description | This study proposes an efficient strategy for co-producing high-value-added xylooligosaccharides (XOS) and humic-like acid (HLA) from vinegar residue based on two-step hydrothermal pretreatments. During the first-step hydrothermal pretreatment (170 °C, 50 min), 29.1% of XOS (X<sub>2</sub>-X<sub>6</sub>) was obtained. The XOS yield was further improved to 36.2% with endoxylanase hydrolysis, thereby increasing the value of (X<sub>2</sub>-X<sub>4</sub>)/XOS from 0.8 to 1.0. Subsequently, the second-step hydrothermal pretreatment was investigated to produce HLA from the solid residue of the first-step hydrothermal pretreatment. The highest HLA yield was 15.3% in the presence of 0.6 mol/L of KOH at 210 °C for 13 h. In addition, 31.7% of hydrochar by-product was obtained. The mass balance results showed that 1000 g of vinegar residue produced 67.9 g of XOS, 91.6 g of HLA, and 189.5 g of hydrochar. Therefore, this study provides a promising pathway for comprehensive use of lignocellulosic biomass in producing XOS and HLA. |
| first_indexed | 2024-03-11T01:05:44Z |
| format | Article |
| id | doaj.art-804f5a9bf168464a9b1a1aafa641467f |
| institution | Directory Open Access Journal |
| issn | 2311-5637 |
| language | English |
| last_indexed | 2024-03-11T01:05:44Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fermentation |
| spelling | doaj.art-804f5a9bf168464a9b1a1aafa641467f2023-11-18T19:15:32ZengMDPI AGFermentation2311-56372023-06-019758910.3390/fermentation9070589Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar ResidueNingxin Jiao0Yuanyuan Zhu1Haoran Li2Yongjian Yu3Yong Xu4Junjun Zhu5Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Grain Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212004, ChinaJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaSchool of Grain Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212004, ChinaJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaJiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, ChinaThis study proposes an efficient strategy for co-producing high-value-added xylooligosaccharides (XOS) and humic-like acid (HLA) from vinegar residue based on two-step hydrothermal pretreatments. During the first-step hydrothermal pretreatment (170 °C, 50 min), 29.1% of XOS (X<sub>2</sub>-X<sub>6</sub>) was obtained. The XOS yield was further improved to 36.2% with endoxylanase hydrolysis, thereby increasing the value of (X<sub>2</sub>-X<sub>4</sub>)/XOS from 0.8 to 1.0. Subsequently, the second-step hydrothermal pretreatment was investigated to produce HLA from the solid residue of the first-step hydrothermal pretreatment. The highest HLA yield was 15.3% in the presence of 0.6 mol/L of KOH at 210 °C for 13 h. In addition, 31.7% of hydrochar by-product was obtained. The mass balance results showed that 1000 g of vinegar residue produced 67.9 g of XOS, 91.6 g of HLA, and 189.5 g of hydrochar. Therefore, this study provides a promising pathway for comprehensive use of lignocellulosic biomass in producing XOS and HLA.https://www.mdpi.com/2311-5637/9/7/589lignocellulosic biomasspretreatmentautohydrolysishumic acidendoxylanase hydrolysis |
| spellingShingle | Ningxin Jiao Yuanyuan Zhu Haoran Li Yongjian Yu Yong Xu Junjun Zhu Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue Fermentation lignocellulosic biomass pretreatment autohydrolysis humic acid endoxylanase hydrolysis |
| title | Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue |
| title_full | Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue |
| title_fullStr | Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue |
| title_full_unstemmed | Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue |
| title_short | Two-Step Hydrothermal Pretreatments for Co-Producing Xylooligosaccharides and Humic-like Acid from Vinegar Residue |
| title_sort | two step hydrothermal pretreatments for co producing xylooligosaccharides and humic like acid from vinegar residue |
| topic | lignocellulosic biomass pretreatment autohydrolysis humic acid endoxylanase hydrolysis |
| url | https://www.mdpi.com/2311-5637/9/7/589 |
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