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Ma CY, Luo XT, Xu LH, Sun Q, Wen JL, Liang XF, Liu HZ, Yuan TQ. Structural elucidation and targeted valorization of untractable lignin from pre-hydrolysis liquor of xylose production via a simple and robust separation approach. Int J Biol Macromol 2023; 253:127029. [PMID: 37742903 DOI: 10.1016/j.ijbiomac.2023.127029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/14/2023] [Accepted: 09/21/2023] [Indexed: 09/26/2023]
Abstract
Effective separation of lignin macromolecules from the xylose pre-hydrolysates (XPH) during the xylose production, thus optimizing the separation and purification process of xylose, is of great significance for reducing the production costs, achieving the high value-added utilization of lignin and increasing the industrial revenue. In this study, a simple and robust method (pH adjustment) for the separation of lignin from XPH was proposed and systematically compared with the conventional acid-promoted lignin precipitation method. The results showed that the lignin removal ratio (up to 60.34 %) of this simple method was higher than that of the conventional method, and the proposed method eliminated the necessity of heating and specialized equipment, which greatly reduced the separation cost. Meanwhile, this simple method does not destroy the components in XPH (especially xylose), ensuring the yield of the target product. On the other hand, the obtained lignin was nano-scale with less condensed structures, which also possessed small molecular weights with narrow distribution, excellent antioxidant activity (8-14 times higher than commercial antioxidants) and UV protection properties. In conclusion, the proposed simple separation method could effectively separate lignin from XPH at low cost, and the obtained lignin had potential commercial applications, which would further enhance the overall profitability of industrial production.
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Affiliation(s)
- Cheng-Ye Ma
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China
| | - Xi-Tao Luo
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Qingdao 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ling-Hua Xu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China
| | - Qian Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China
| | - Jia-Long Wen
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China.
| | - Xiang-Feng Liang
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Qingdao 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Hui-Zhou Liu
- CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT), Chinese Academy of Sciences (CAS), Qingdao 266101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tong-Qi Yuan
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, No. 35 Tsinghua East Road, Haidian District, Beijing 100083, China
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2
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Wang Z, Deuss PJ. The isolation of lignin with native-like structure. Biotechnol Adv 2023; 68:108230. [PMID: 37558187 DOI: 10.1016/j.biotechadv.2023.108230] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/03/2023] [Accepted: 08/04/2023] [Indexed: 08/11/2023]
Abstract
Searching for renewable alternatives for fossil carbon resources to produce chemicals, fuels and materials is essential for the development of a sustainable society. Lignin, a major component of lignocellulosic biomass, is an abundant renewable source of aromatics and is currently underutilized as it is often burned as an undesired side stream in the production of paper and bioethanol. This lignin harbors great potential as source of high value aromatic chemicals and materials. Biorefinery schemes focused on lignin are currently under development with aim of acquiring added value from lignin. However, the performance of these novel lignin-focused biorefineries is closely linked with the quality of extracted lignin in terms of the level of degradation and modification. Thus, the reactivity including the degradation pathways of the native lignin contained in the plant material needs to be understood in detail to potentially achieve higher value from lignin. Undegraded native-like lignin with an as close as possible structure to native lignin contained in the lignocellulosic plant material serves as a promising model lignin to support detailed studies on the structure and reactivity of native lignin, yielding key understanding for the development of lignin-focused biorefineries. The aim of this review is to highlight the different methods to attain "native-like" lignins that can be valuable for such studies. This is done by giving a basic introduction on what is known about the native lignin structure and the techniques and methods used to analyze it followed by an overview of the fractionation and isolation methods to isolate native-like lignin. Finally, a perspective on the isolation and use of native-like lignin is provided, showing the great potential that this type of lignin brings for understanding the effect of different biomass treatments on the native lignin structure.
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Affiliation(s)
- Zhiwen Wang
- Department of Chemical Engineering (ENTEG), University of Groningen, Nijenborgh 4, 9747, AG, Groningen, the Netherlands.
| | - Peter J Deuss
- Department of Chemical Engineering (ENTEG), University of Groningen, Nijenborgh 4, 9747, AG, Groningen, the Netherlands.
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3
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Fuso A, Righetti L, Rosso F, Rosso G, Manera I, Caligiani A. A multiplatform metabolomics/reactomics approach as a powerful strategy to identify reaction compounds generated during hemicellulose hydrothermal extraction from agro-food biomasses. Food Chem 2023; 421:136150. [PMID: 37086522 DOI: 10.1016/j.foodchem.2023.136150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 04/04/2023] [Accepted: 04/10/2023] [Indexed: 04/24/2023]
Abstract
Hydrothermal treatment is commonly used for hemicelluloses extraction from lignocellulosic materials. In this study, we thoroughly investigated with a novel approach the metabolomics of degradation compounds formed when hazelnut shells are subjected to this type of treatment. Three different complementary techniques were combined, namely GC-MS, 1H NMR, and UHPLC-IM-Q-TOF-MS. Organic acids, modified sugars and aromatic compounds, likely to be the most abundant chemical classes, were detected and quantified by NMR, whereas GC- and LC-MS-based techniques allowed to detect many molecules with low and higher Mw, respectively. Furans, polyols, N-heterocyclic compounds, aldehydes, ketones, and esters appeared, among others. Ion mobility-based LC-MS method was innovatively used for this purpose and could allow soon to create potentially useful datasets for building specific databases relating to the formation of these compounds in different process conditions and employing different matrices. This could be a very intelligent approach especially in a risk assessment perspective.
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Affiliation(s)
- Andrea Fuso
- Food and Drug Department, University of Parma, Via Parco Area delle Scienze 17/A, 43124 Parma, Italy.
| | - Laura Righetti
- Food and Drug Department, University of Parma, Via Parco Area delle Scienze 17/A, 43124 Parma, Italy; Wageningen Food Safety Research (WFSR), Wageningen University & Research, P.O. Box 230, Wageningen 6700 AE, Netherlands; Laboratory of Organic Chemistry, Wageningen University, Stippeneng 4, Wageningen 6708 WE, Netherlands.
| | - Franco Rosso
- Soremartec Italia Srl, Ferrero Group, 12051 Alba, CN, Italy.
| | - Ginevra Rosso
- Soremartec Italia Srl, Ferrero Group, 12051 Alba, CN, Italy.
| | - Ileana Manera
- Soremartec Italia Srl, Ferrero Group, 12051 Alba, CN, Italy.
| | - Augusta Caligiani
- Food and Drug Department, University of Parma, Via Parco Area delle Scienze 17/A, 43124 Parma, Italy.
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4
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Guan X, Zhang B, Liu S, An M, Han Q, Li D, Rao P. Facile degradation of chitosan-sodium alginate-chromium (III) gel in relation to leather re-tanning and filling. Int J Biol Macromol 2023; 240:124437. [PMID: 37060985 DOI: 10.1016/j.ijbiomac.2023.124437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Revised: 04/06/2023] [Accepted: 04/10/2023] [Indexed: 04/17/2023]
Abstract
Natural polysaccharide hydrogel, exemplified by chitosan‑sodium alginate (CS-SA), has been prevailing in adsorption of chromium (III) (Cr(III)) containing contaminant. However, the traditional desorption of CS-SA-Cr(III) to recycle the adsorbent faces the problems including chemical desorbents secondary pollution, resource waste of the terminal CS-SA adsorbents, and tedious work of reusing the desorbed Cr(III). Herein, the adsorption product, CS-SA-Cr(III) gel, was degraded to CS/SA/Cr(III) sol and applied in leather re-tanning and filling processes directly. To achieve this goal, three degradation methods were used to transform the gel to sol. Due to the excellent overall performance of the CS/SA/Cr(III)-HMD4 sol (obtained by the hydrothermal-mechanical degradation method for 4 h (HMD4)), including wide size and distribution range, moderate viscosity (54 ± 3.1 mPa·s), high electronegativity (-38.6 ± 5.8 mV), and good stability, the resultant leather after re-tanning and filling by the sol achieved fascinating properties such as good thermal stability (Ts, 116.8 ± 1.8 °C; Td, 94.2 ± 1.7 °C), mechanical performance (tensile strength, 6.9 ± 0.52 MPa; elongation at break, 95 ± 3.0 %), and superduper thickening rate (31.8 %). Moreover, the mechanism of good re-tanning and filling effects was deciphered. Therefore, this work intends to overcome the limitation of traditional desorption technology and further realizes the high-valued application of the exhausted CS-SA-Cr(III) in leather re-tanning and filling processes.
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Affiliation(s)
- Xiaoyu Guan
- College of Bioresources Chemical and Materials Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China; Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu 610065, PR China.
| | - Bingyuan Zhang
- College of Bioresources Chemical and Materials Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China
| | - Shiyong Liu
- Chengdu Decoli Polymer Materials Corporation Limited, Chengdu 610065, PR China
| | - Meng An
- College of Bioresources Chemical and Materials Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China
| | - Qingxin Han
- College of Bioresources Chemical and Materials Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China
| | - Dongping Li
- College of Bioresources Chemical and Materials Engineering, Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi Collaborative Innovation Center of Industrial Auxiliary Chemistry and Technology, College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi 710021, PR China.
| | - Ping Rao
- State Key Laboratory of Fluid Power & Mechatronic System, Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Center for X-Mechanics, Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, PR China.
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5
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Velumani M, Jeyadharmarajan J. Conversion of novel tannery sludge-derived biochar/TiO 2 nanocomposite for efficient removal of Cr (VI) under UV light: photocatalytic performance and mechanism insight. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:28173-28191. [PMID: 36401003 DOI: 10.1007/s11356-022-24124-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
An investigation on the reduction of Cr (VI) pollutant from tannery effluents using TiO2, SB/TiO2, and c-SB/TiO2 nano photocatalysts was presented in this study. For the preparation of Biochar-based TiO2 photocatalyst (SB/TiO2), tannery sludge was utilized as a precursor. Hydrothermal pre-treatment was adopted to prepare chemically activated SB/TiO2 and SB/TiO2 nanocomposites. The morphology, crystal structure, optical properties, and elemental composition of the prepared catalysts were analyzed by XRD, FT-IR, SEM-EDX, BET analysis, ZPC, PL, TGA, and Raman spectroscopy. The band gap analysis of Photocatalyst was measured using a DRS instrument, and band gap energy of 3.39 eV was obtained for c-SB/TiO2 photocatalyst. The developed c-SB/TiO2 catalyst exhibits a larger specific surface area of 646.85 m2/g than TiO2 and SB/TiO2 (74.58 m2/g and 573.74 m2/g), respectively. The enhanced photocatalytic activity for the pollutant removal was achieved by the photocatalyst due to their wide band gap and effective charge separation. The kinetic rate constant was achieved in the pseudo-first-order model, which fits well for the reduction of Cr (VI). Furthermore, at the optimal conditions of 10 mg/L contaminant concentration, pH 2, and 0.5 g/L catalyst dosage, 98.56% reduction was observed after 180 min of reaction. The OH acts as a major removal pathway for Cr (VI) contaminants with more than 50% reduction in COD. This study proves that c-SB/TiO2 photocatalysts can remove toxic contaminants under UV light irradiation with good recycling performance up to 5 times.
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Affiliation(s)
- Mohanapriya Velumani
- Department of Civil Engineering, Government College of Technology, 641013, Coimbatore, India
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Martinez Diaz J, Grande PM, Klose H. Small-scale OrganoCat processing to screen rapeseed straw for efficient lignocellulose fractionation. FRONTIERS IN CHEMICAL ENGINEERING 2023. [DOI: 10.3389/fceng.2023.1098411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Agricultural residues such as rapeseed straw can be a valuable source of cellulose, sugars, and aromatic molecules like lignin. Understanding its composition is crucial in order to develop suitable processing technology for the production of biofuel or biochemicals from rapeseed straw. Here, we developed a small-scale OrganoCat system to screen multiple technical conditions and different samples at higher throughput and utilize this system to analyze straw samples from a set of 14 genetically different Brassica lines on their processability. Correlation analysis was performed to investigate the effects of cell wall polymer features on rapeseed biomass disintegration. At comparably mild reaction conditions, the differences in recalcitrance towards OrganoCat fractionation within the set were especially associated with parameters such as pectic polysaccharide content, acetylation, and hemicellulose composition. These findings can subsequently be used to optimize and scale up the pretreatment and fractionation of lignocellulose derived from rapeseed straw.
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7
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Pérez-Pérez A, Gullón B, Lobato-Rodríguez Á, Garrote G, del Río PG. Microwave-assisted extraction of hemicellulosic oligosaccharides and phenolics from Robinia pseudoacacia wood. Carbohydr Polym 2022; 301:120364. [DOI: 10.1016/j.carbpol.2022.120364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 11/03/2022] [Accepted: 11/14/2022] [Indexed: 11/19/2022]
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8
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Gong WH, Zhang C, He JW, Gao YY, Li YJ, Zhu MQ, Wen JL. A synergistic hydrothermal-deep eutectic solvents (DES) pretreatment for acquiring xylooligosaccharides and lignin nanoparticles from Eucommia ulmoides wood. Int J Biol Macromol 2022; 209:188-197. [DOI: 10.1016/j.ijbiomac.2022.04.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 03/21/2022] [Accepted: 04/02/2022] [Indexed: 12/23/2022]
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9
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Guo KN, Zhang C, Xu LH, Sun SC, Wen JL, Yuan TQ. Efficient fractionation of bamboo residue by autohydrolysis and deep eutectic solvents pretreatment. BIORESOURCE TECHNOLOGY 2022; 354:127225. [PMID: 35477102 DOI: 10.1016/j.biortech.2022.127225] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 04/19/2022] [Accepted: 04/21/2022] [Indexed: 06/14/2023]
Abstract
Bamboo processing residue, which is rich in parenchyma cells, was treated as huge waste in bamboo processing industry, such as reassemble bamboo and bamboo flooring. Herein, autohydrolysis and rapid different deep eutectic solvents (DES) delignification strategy were consecutively performed to remove hemicelluloses and lignin from bamboo processing residue. The xylooligosaccharides (XOS) with high yield (34.35%) was achieved in the autohydrolysis process. Results showed that alkaline DES pretreatment resulted in the highest glucose yield (88.22%) and relatively high delignification rate (83.75%) as well as well-preserved lignin structures. However, the lignin fractions obtained under acidic DES conditions were tending to assemble into lignin nanoparticles (LNPs) and having excellent antioxidant activity as compared to those obtained from alkaline DES system. In brief, the combination of autohydrolysis and rapid DES delignification can achieve orientated fractionation of the components from the industrialized bamboo.
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Affiliation(s)
- Kai-Ning Guo
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Chen Zhang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Ling-Hua Xu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shao-Chao Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Jia-Long Wen
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Tong-Qi Yuan
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
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10
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Effects of hydrothermal pretreatment on the dissolution and structural evolution of hemicelluloses and lignin: A review. Carbohydr Polym 2022; 281:119050. [DOI: 10.1016/j.carbpol.2021.119050] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 12/08/2021] [Accepted: 12/24/2021] [Indexed: 12/15/2022]
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11
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Yue P, Hu Y, Tian R, Bian J, Peng F. Hydrothermal pretreatment for the production of oligosaccharides: A review. BIORESOURCE TECHNOLOGY 2022; 343:126075. [PMID: 34606922 DOI: 10.1016/j.biortech.2021.126075] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/27/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Oligosaccharides are low-molecular-weight carbohydrates with crucial physical, chemical, and physiological properties, which are increasingly important in the fields of food, pharmaceuticals, cosmetics, and biomedicine. Pretreating biomass in a cost-effective way is a significant challenge for oligosaccharides research. Hydrothermal pretreatment is a potentially eco-friendly technology to obtain oligosaccharides by deconstructing biomass. In this work, we compared the differences between hydrothermal pretreatment and the traditional pretreatment method. The fundamentals and classification of hydrothermal pretreatment, as well as the latest studies on hydrothermal preparation of oligosaccharides, were further reviewed and evaluated to provide a theoretical basis for the production and application of oligosaccharides. Some challenges and future trends to develop green and large-scale hydrothermal pretreatment were proposed for the production of oligosaccharides.
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Affiliation(s)
- Panpan Yue
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China
| | - Yajie Hu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China
| | - Rui Tian
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China
| | - Jing Bian
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China
| | - Feng Peng
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, PR China.
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12
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Wang ZK, Huang C, Zhong JL, Wang Y, Tang L, Li B, Sheng JJ, Chen L, Sun S, Shen X. Valorization of Chinese hickory shell as novel sources for the efficient production of xylooligosaccharides. BIOTECHNOLOGY FOR BIOFUELS 2021; 14:226. [PMID: 34838122 PMCID: PMC8626943 DOI: 10.1186/s13068-021-02076-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
Chinese hickory shell, a by-product of the food industry, is still not utilized and urgent to develop sustainable technologies for its valorization. This research focuses on the systematical evaluation of degraded products and xylooligosaccharide production with high yield from the shell via hydrothermal process. The pretreatment was carried out in a bath pressurized reactor at 140-220 °C for 0.5-2 h. The results indicated that the pretreatment condition strongly affected the chemical structures and compositions of the liquid fraction. The maximum yield of XOS (55.3 wt%) with limitation of by-products formation was achieved at 160 °C for 2 h. High temperature (220 °C) and short time (0.5 h) contributed to hydrolysis of xylooligosaccharide with high DP to yield 37.5 wt% xylooligosaccharide with DP from 2 to 6. Xylooligosaccharide obtained mainly consisted of xylan with branches according to the HSQC NMR analysis. Overall, the production of XOS with a high yield from food waste will facilitate the valorization of food waste in the biorefinery industry.
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Affiliation(s)
- Zhi-Kun Wang
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Caoxing Huang
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Jun-Lei Zhong
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Yi Wang
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Lv Tang
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Bing Li
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Jian-Jun Sheng
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China
| | - Liang Chen
- Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, College of Environmental and Resource Sciences, Zhejiang A&F University, Lin'an, 311300, Hangzhou, China.
| | - Shaolong Sun
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
- State Key Laboratory of Bio-Fibers and Eco-Textiles, Qingdao University, Qingdao, 266071, Shandong, China.
| | - XiaoJun Shen
- State Key Laboratory of Catalysis (SKLC), Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences, Dalian, 116023, China.
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13
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Shen X, Sun R. Recent advances in lignocellulose prior-fractionation for biomaterials, biochemicals, and bioenergy. Carbohydr Polym 2021; 261:117884. [PMID: 33766371 DOI: 10.1016/j.carbpol.2021.117884] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/25/2021] [Accepted: 02/26/2021] [Indexed: 12/20/2022]
Abstract
Due to over-consumption of fossil resources and environmental problems, lignocellulosic biomass as the most abundant and renewable materials is considered as the best candidate to produce biomaterials, biochemicals, and bioenergy, which is of strategic significance and meets the theme of Green Chemistry. Highly efficient and green fractionation of lignocellulose components significantly boosts the high-value utilization of lignocellulose and the biorefinery development. However, heterogeneity of lignocellulosic structure severely limited the lignocellulose fractionation. This paper offers the summary and perspective of the extensive investigation that aims to give insight into the lignocellulose prior-fractionation. Based on the role and structure of lignocellulose component in the plant cell wall, lignocellulose prior-fractionation can be divided into cellulose-first strategy, hemicelluloses-first strategy, and lignin-first strategy, which realizes the selective dissociation and transformation of a component in lignocellulose. Ultimately, the challenges and opportunities of lignocellulose prior-fractionation are proposed on account of the existing problems in the biorefining valorization.
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Affiliation(s)
- Xiaojun Shen
- Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials, Dalian Polytechnic University, Dalian, 116034, China; State Key Laboratory of Catalysis (SKLC), Dalian National Laboratory for Clean Energy (DNL), Dalian, China
| | - Runcang Sun
- Liaoning Key Laboratory of Lignocellulose Chemistry and BioMaterials, Dalian Polytechnic University, Dalian, 116034, China.
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14
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Dávila I, Gullón P, Labidi J. Influence of the heating mechanism during the aqueous processing of vine shoots for the obtaining of hemicellulosic oligosaccharides. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 120:146-155. [PMID: 33302017 DOI: 10.1016/j.wasman.2020.11.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/16/2020] [Accepted: 11/17/2020] [Indexed: 06/12/2023]
Abstract
This work deals with the revalorization of an important winery residue such as the vine shoots by the obtaining of oligosaccharides with potential prebiotic activity. The manufacture of these added-value products was performed by an autohydrolysis treatment assisted with microwaves to make the process less time consuming and more environmentally friendly. The influence of the reaction time (0-40 min) and the temperature (140-200) on the production of oligosaccharides during the microwave-assisted autohydrolysis was evaluated. The highest concentration of oligosaccharides (168.3 g/Kg oven-dried vines shoots) was achieved during the treatment carried out at 180 °C for 20 min. To assess the benefits of the assistance of the autohydrolysis treatment with the microwaves a conventionally heated treatment was performed using conditions (180 °C for 15 min) that provoked similar effects on the solubilisation of the hemicellulosic fraction. This treatment permitted the obtaining of 203.5 g oligosaccharides/Kg oven-dried vines shoots using 61.0% more of the time needed to carry out the microwaves-assisted autohydrolysis. Although the microwave-assisted treatment permitted the manufacture of a lower amount of oligosaccharides, only consumed 28.8% of the energy needed to perform the conventionally heated treatment. The oligosaccharides manufactured by the two treatments were substituted xyloglucans with different polymerization and acetylation degrees, which due to their potential prebiotic activity could be highly appreciated by pharmaceuticals and food industries. Thus, this work demonstrated the environmental sustainability of the microwave-assisted autohydrolysis for the revalorisation of the vine shoots.
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Affiliation(s)
- Izaskun Dávila
- Department of Chemical and Environmental Engineering, University of the Basque Country, UPV/EHU, 20018 San Sebastián, Spain
| | - Patricia Gullón
- Department of Chemical and Environmental Engineering, University of the Basque Country, UPV/EHU, 20018 San Sebastián, Spain
| | - Jalel Labidi
- Department of Chemical and Environmental Engineering, University of the Basque Country, UPV/EHU, 20018 San Sebastián, Spain.
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15
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Lee J, Park KY. Impact of hydrothermal pretreatment on anaerobic digestion efficiency for lignocellulosic biomass: Influence of pretreatment temperature on the formation of biomass-degrading byproducts. CHEMOSPHERE 2020; 256:127116. [PMID: 32460161 DOI: 10.1016/j.chemosphere.2020.127116] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 05/16/2023]
Abstract
Anaerobic digestion (AD) of lignocellulosic biomass is appealing because of the abundance and ease of obtaining the biomass locally. However, the recalcitrance of lignocellulosic biomass presents an obstacle in the hydrolysis step of AD and lowers the process efficiency. In this study, sunflower, which is a model lignocellulosic biomass, was pretreated by thermal (hydrothermal pretreatment, HTP) and non-thermal (milling) methods; the methane yield and biodegradability of the pretreated biomass were determined using a series of batch tests. The thermal pretreatment method showed a significantly higher methane yield (213.87-289.47 mL g-1 VS) and biodegradability (43-63%) than those of the non-thermally pretreated biomass, and the optimum pretreatment effect was observed at an HTP temperature of 180 °C. However, at an HTP temperature exceeding 200 °C, the induced formation of 5-hydroxymethylfurfural and furfural significantly lowered the methane yield and biodegradability. This study revealed that the HTP temperature is closely related to the formation of lignocellulosic biomass-degrading byproducts, which potentially hinder the methanogenesis step in AD; severe HTP conditions may have the opposite effect on the AD performance of lignocellulosic biomass.
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Affiliation(s)
- Jongkeun Lee
- Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea
| | - Ki Young Park
- Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea.
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16
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Zhu R, Liu X, Li L, Wang Q, Zhao Q, Liu S, Feng W, Xu F, Zhang X. Valorization of industrial xylan-rich hemicelluloses into water-soluble derivatives by in-situ acetylation in EmimAc ionic liquid. Int J Biol Macromol 2020; 163:457-463. [PMID: 32634510 DOI: 10.1016/j.ijbiomac.2020.06.289] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/30/2020] [Accepted: 06/30/2020] [Indexed: 11/28/2022]
Abstract
In this study, aimed at valorization of industrial xylan-rich hemicelluloses (a by-product of dissolving pulp process), water-soluble hemicelluloses were fabricated with mild acetylation in 1-ethyl-3-methylimidazolium acetate ionic liquid (EmimAc) and dichloroacetyl chloride (Cl2AcCl) system by a facile and novel method. The structure of the acetylated hemicelluloses was characterized by FT-IR and NMR spectra. The resultant modified products could fully dissolve in water with the degree of substitution (DS) valued between 0.17 and 0.37. Structural characterization indicated that the modified hemicelluloses were chiefly composed of the (1 → 4)-linked β-D-Xylp backbone with hydroxyl or -COCH3 linked to O-2 and O-3 of the Xylp units. Moreover, the mild acetylation was achieved by one-pot method, in which the hemicelluloses reacted with mixed anhydride produced between EmimAc and Cl2AcCl rather than Cl2AcCl. Rheological behavior measurements revealed that acetylated hemicelluloses solutions showed shear-thinning behavior and indicated lower viscosity compared with those of the referenced hemicelluloses. The excellent water-solubility of industrial hemicelluloses would widen its application field and be easier for its conversion into desired chemicals.
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Affiliation(s)
- Ruonan Zhu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Xin Liu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Lijun Li
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Qi Wang
- Xinjiang Zhongtai Textile Group Co. Ltd., Korla Economic and Technological Development Zone, Xinjiang 841000, China
| | - Qiang Zhao
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Shijie Liu
- College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, NY 13210, USA
| | - Wenjun Feng
- Xinjiang Zhongtai Textile Group Co. Ltd., Korla Economic and Technological Development Zone, Xinjiang 841000, China
| | - Feng Xu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Xueming Zhang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China..
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17
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Xu J, Dai L, Zhang C, Gui Y, Yuan L, Lei Y, Fan B. Ionic liquid-aided hydrothermal treatment of lignocellulose for the synergistic outputs of carbon dots and enhanced enzymatic hydrolysis. BIORESOURCE TECHNOLOGY 2020; 305:123043. [PMID: 32114304 DOI: 10.1016/j.biortech.2020.123043] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 02/16/2020] [Accepted: 02/17/2020] [Indexed: 06/10/2023]
Abstract
How to propel an efficient exploitation of waste streams is a pivotal tache for the long-range augment of hydrothermal biomass valorization. A facile approach was proposed to simultaneously produce carbon dots (CDs), fermentable sugar, and cellulose enzymatic lignin from agricultural straw with the aid of ionic liquid (IL, 1-aminoethyl-3-methylimidazolium nitrate, [C2NH2MIm][NO3]) catalyzed hydrothermal treatment. The graphite N-doped CDs with bright-blue fluorescence, which was mainly derived from the incorporation of hemicellulose (e.g. xylooligosaccharides), lignin and [C2NH2MIm][NO3], exhibited an average-diameter of 8.14 nm. The exfoliation of amorphous parts and robust fibers was formed to improve cellulose digestibility from 14.7 to 81.6%. The efficient recovery and checkup of lignin pave a way for its potential depolymerization into arenes. This protocol offers a significant benefit for large-scale hydrothermal biorefinery where reduction of process waste is a prime concern, and leads to high-value products (i.e., CDs and lignin) that also fosters the feasibility of bioethanol.
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Affiliation(s)
- Jikun Xu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Lin Dai
- Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Chuntao Zhang
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Yang Gui
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Lan Yuan
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Yang Lei
- Center for Energy Resources Engineering, Department of Chemistry, Technical University of Denmark, Lyngby 2800, Denmark
| | - Baoan Fan
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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18
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Gullón P, Eibes G, Lorenzo JM, Pérez-Rodríguez N, Lú-Chau TA, Gullón B. Green sustainable process to revalorize purple corn cobs within a biorefinery frame: Co-production of bioactive extracts. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 709:136236. [PMID: 31927433 DOI: 10.1016/j.scitotenv.2019.136236] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 12/18/2019] [Accepted: 12/18/2019] [Indexed: 06/10/2023]
Abstract
Purple corn (Zea mays L.) is used for the preparation of traditional drinks and desserts, generating great quantities of residues. The scarce information about purple corn cob (PCC) is encouraging an interest in exploring its potential as a valuable source of bioactive compounds with benefits for human health. In this study, a green method based on hydrothermal processing was used for the simultaneous extraction of oligosaccharides and phenolic compounds from PCC. For this purpose, the effects of three factors (time, temperature and pH) on the oligosaccharide content (OSC), total phenolic content (TPC), total flavonoid content (TFC), total anthocyanin content (TAC), as well as on the antioxidant activity measured with three different methods (DPPH, ABTS and FRAP) were evaluated. The bioactive extract obtained under optimal conditions presented a high content of bioactive compounds exhibiting a notable antioxidant capacity and moderate inhibitory activities towards xanthine oxidase. This extract was also structurally characterized by FTIR, HPAEC-DAD, MALDI-TOF-MS and TGA, and the HPLC-ESI-MS analysis led to the tentative identification of 15 antioxidant phenolic compounds. Thus, this research demonstrated that this residue from the food industry has a high potential for obtaining several bioactive compounds that can be utilized as multi-functional ingredients in the food and pharmaceutical industries.
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Affiliation(s)
- Patricia Gullón
- Centro Tecnológico de la Carne de Galicia, rúa Galicia n° 4, Parque Tecnológico de Galicia, San Cibrao das Viñas 32900, Ourense, Spain
| | - Gemma Eibes
- CRETUS Institute, Department of Chemical Engineering, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - José M Lorenzo
- Centro Tecnológico de la Carne de Galicia, rúa Galicia n° 4, Parque Tecnológico de Galicia, San Cibrao das Viñas 32900, Ourense, Spain
| | - Noelia Pérez-Rodríguez
- CRETUS Institute, Department of Chemical Engineering, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Thelmo A Lú-Chau
- CRETUS Institute, Department of Chemical Engineering, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Beatriz Gullón
- Centro Tecnológico de la Carne de Galicia, rúa Galicia n° 4, Parque Tecnológico de Galicia, San Cibrao das Viñas 32900, Ourense, Spain
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19
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Ruiz HA, Conrad M, Sun SN, Sanchez A, Rocha GJM, Romaní A, Castro E, Torres A, Rodríguez-Jasso RM, Andrade LP, Smirnova I, Sun RC, Meyer AS. Engineering aspects of hydrothermal pretreatment: From batch to continuous operation, scale-up and pilot reactor under biorefinery concept. BIORESOURCE TECHNOLOGY 2020; 299:122685. [PMID: 31918970 DOI: 10.1016/j.biortech.2019.122685] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 12/20/2019] [Accepted: 12/23/2019] [Indexed: 06/10/2023]
Abstract
Different pretreatments strategies have been developed over the years mainly to enhance enzymatic cellulose degradation. In the new biorefinery era, a more holistic view on pretreatment is required to secure optimal use of the whole biomass. Hydrothermal pretreatment technology is regarded as very promising for lignocellulose biomass fractionation biorefinery and to be implemented at the industrial scale for biorefineries of second generation and circular bioeconomy, since it does not require no chemical inputs other than liquid water or steam and heat. This review focuses on the fundamentals of hydrothermal pretreatment, structure changes of biomass during this pretreatment, multiproduct strategies in terms of biorefinery, reactor technology and engineering aspects from batch to continuous operation. The treatise includes a case study of hydrothermal biomass pretreatment at pilot plant scale and integrated process design.
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Affiliation(s)
- Héctor A Ruiz
- Biorefinery Group, Food Research Department, Faculty of Chemistry Sciences, Autonomous University of Coahuila, Saltillo, Coahuila 25280, Mexico.
| | - Marc Conrad
- Hamburg University of Technology (TUHH), Institute of Thermal Separation Processes, Eißendorfer Straße 38, 21073 Hamburg, Germany
| | - Shao-Ni Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Arturo Sanchez
- Laboratorio de Futuros en Bioenergía, Unidad Guadalajara de Ingeniería Avanzada, Centro de Investigación y Estudios Avanzados (CINVESTAV), Zapopan, Jalisco, Mexico
| | - George J M Rocha
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center of Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-100, Brazil
| | - Aloia Romaní
- CEB-Centre of Biological Engineering, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal
| | - Eulogio Castro
- Department of Chemical, Environmental and Materials Engineering, Center for Advanced Studies in Energy and Environment (CEAEMA), University of Jaén, Campus Las Lagunillas, s/n, Building B3, 23071 Jaén, Spain
| | - Ana Torres
- Instituto de Ingeniería Química, Facultad de Ingeniería, Universidad de la República, Montevideo 11300, Uruguay
| | - Rosa M Rodríguez-Jasso
- Biorefinery Group, Food Research Department, Faculty of Chemistry Sciences, Autonomous University of Coahuila, Saltillo, Coahuila 25280, Mexico
| | - Liliane P Andrade
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center of Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-100, Brazil; Postgraduate Program in Functional and Molecular Biology, Institute of Biology, State University of Campinas, Campinas, São Paulo 13084-970, Brazil
| | - Irina Smirnova
- Hamburg University of Technology (TUHH), Institute of Thermal Separation Processes, Eißendorfer Straße 38, 21073 Hamburg, Germany
| | - Run-Cang Sun
- Center for Lignocellulose Science and Engineering, College of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China
| | - Anne S Meyer
- Protein Chemistry and Enzyme Technology, DTU Bioengineering, Department of Biotechnology and Biomedicine, Technical University of Denmark, DK-2800 Lyngby, Denmark
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20
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Chen Y, Zhai Z, Liu J, Zhang J, Geng Z, Lyu H. Exploring the reaction mechanism of ethanol synthesis from acetic acid over a Ni 2In(100) surface. Phys Chem Chem Phys 2020; 22:7564-7576. [DOI: 10.1039/d0cp00241k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Incremental insights on the mechanism of ethanol synthesis from acetic acid and the unique effect on the inhibition of C–C bond breaking on the Ni2In(100) surface.
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Affiliation(s)
- Yifei Chen
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
| | - Ziwei Zhai
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
| | - Jiatao Liu
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
| | - Jia Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
| | - Zhongfeng Geng
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
| | - Huisheng Lyu
- Key Laboratory for Green Chemical Technology of Ministry of Education
- R&D Center for Petrochemical Technology
- Tianjin University
- Tianjin 300072
- China
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21
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Lyu H, Zhang J, Zhou J, Lv C, Geng Z. The byproduct-organic acids strengthened pretreatment of cassava straw: Optimization and kinetic study. BIORESOURCE TECHNOLOGY 2019; 290:121756. [PMID: 31295573 DOI: 10.1016/j.biortech.2019.121756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/01/2019] [Accepted: 07/02/2019] [Indexed: 06/09/2023]
Abstract
The subcritical liquid hot water (SLHW) pretreatment could be strengthened by its byproduct-organic acids, such as acetic acid (AA), lactic acid (LA) and formic acid (FA). The effects of these three acids on the pretreatment were investigated by the yield of fermentable sugars. The results showed that the addition of acids could effectively catalyze the hydrolysis of hemicellulose to C5 sugars and contribute to the subsequent enzymatic hydrolysis of cellulose. It was found that all three organic acids promote xylose production, and the copresence of AA + LA could limit the content of the fermentation inhibitor. The optimum proportion of three organic acids were 0.33 wt%AA + 0.45 wt%LA + 0.20 wt%FA, and the yield of C5 sugars after pretreatment and C6 sugar after enzymatic hydrolysis were 89.06% and 78.56%, respectively. The kinetic studies proved that byproduct-organic acids could promote xylose production and inhibit its further degradation and explained that xylose would accumulate at lower temperatures.
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Affiliation(s)
- Huisheng Lyu
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Jia Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Jinyi Zhou
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Chunliu Lv
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China
| | - Zhongfeng Geng
- Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Tianjin University, Tianjin 300072, China; Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300072, China.
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22
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Xian L, Li Z, Tang AX, Qin YM, Li QY, Liu HB, Liu YY. A novel neutral and thermophilic endoxylanase from Streptomyces ipomoeae efficiently produced xylobiose from agricultural and forestry residues. BIORESOURCE TECHNOLOGY 2019; 285:121293. [PMID: 30999191 DOI: 10.1016/j.biortech.2019.03.132] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 03/25/2019] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
Endoxylanases capable of producing high ratios of xylobiose from agricultural and forestry residues in neutral and high temperature conditions are attractive for the prebiotic and alternative sweetener industries. In this study, a putative glycosyl hydrolase gene from Streptomyces ipomoeae was cloned and expressed in Escherichia coli. The recombinant enzyme, named as SipoEnXyn10A, hydrolyzed beechwood xylan in endo-action mode releasing xylobiose as its main end product. It was most active at pH 6.5 and 75-80 °C and showed remarkable stability at 65 °C. The xylobiose yield from 10 g corncob and moso bamboo reached 1.123 ± 0.021 and 0.229 ± 0.005 g, respectively, at pH 6.5 and 70 °C, whichwas higher than other reports using the same material. Moreover, high ratios of xylobiose in the xylose-based product of about 85% were obtained from corncob, moso bamboo sawdust, cassava stem and Chinese fir sawdust. These results demonstrated that SipoEnXyn10A has potential for industrial application.
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Affiliation(s)
- Liang Xian
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China
| | - Zhong Li
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China
| | - Ai-Xing Tang
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Guangxi Key Laboratory of Biorefinery, Nanning 530003, Guangxi, PR China
| | - Yi-Min Qin
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Guangxi Key Laboratory of Biorefinery, Nanning 530003, Guangxi, PR China
| | - Qing-Yun Li
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Guangxi Key Laboratory of Biorefinery, Nanning 530003, Guangxi, PR China
| | - Hai-Bo Liu
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Guangxi Key Laboratory of Biorefinery, Nanning 530003, Guangxi, PR China
| | - You-Yan Liu
- College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, Guangxi, PR China; Guangxi Key Laboratory of Biorefinery, Nanning 530003, Guangxi, PR China.
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23
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Vine shoots as new source for the manufacture of prebiotic oligosaccharides. Carbohydr Polym 2019; 207:34-43. [DOI: 10.1016/j.carbpol.2018.11.065] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 10/22/2018] [Accepted: 11/21/2018] [Indexed: 11/22/2022]
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24
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Lyu H, Zhou J, Geng Z, Lyu C, Li Y. Two-stage processing of liquid hot water pretreatment for recovering C5 and C6 sugars from cassava straw. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Chen T, Li Z, Zhang X, Min D, Wu Y, Wen J, Yuan T. Effects of Hydrothermal Pretreatment on the Structural Characteristics of Organosolv Lignin from Triarrhena lutarioriparia. Polymers (Basel) 2018; 10:E1157. [PMID: 30961082 PMCID: PMC6403627 DOI: 10.3390/polym10101157] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/26/2018] [Accepted: 10/14/2018] [Indexed: 11/16/2022] Open
Abstract
The effects of hydrothermal pretreatment (170⁻180 °C, 30⁻60 min) on the structural characteristics of enzymatic and extracted lignin from Triarrhena lutarioriparia (TL) during the integrated delignification process have been comprehensively investigated. Ion chromatography and NMR characterization showed that liquid products after mild hydrothermal process (170 °C, 30 min) were mainly composed of xylooligosaccharide (XOS) with different degrees of polymerization (DP ≥ 2). In addition, the structural changes of lignin during hydrothermal pretreatment and organic acid delignification process have been demonstrated by quantitative 2D heteronuclear single quantum coherence (2D-HSQC) and 31P-NMR techniques. Results showed that the structural changes of lignin (e.g., cleavage of β-O-4 linkages) induced by the hydrothermal pretreatment will facilitate the subsequent organic acid delignification process, and acetylated lignin could be obtained with a considerable yield, which can be used in lignin-based composite and candidate feedstock for catalytic upgrading of lignin. In short, the proposed process facilitates the producing of XOS and acetylated lignin for lignin valorization.
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Affiliation(s)
- Tianying Chen
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Zhiwen Li
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Xueming Zhang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Douyong Min
- Guangxi Key Laboratory of Clean Pulp and Papermaking and Pollution Control, Nanning 530004, China.
| | - Yuying Wu
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Jialong Wen
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
| | - Tongqi Yuan
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
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26
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Qin Z, Sun M, Luo X, Zhang H, Xie J, Chen H, Yang L, Shi L. Life-cycle assessment of tobacco stalk utilization. BIORESOURCE TECHNOLOGY 2018; 265:119-127. [PMID: 29885497 DOI: 10.1016/j.biortech.2018.05.110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 05/30/2018] [Accepted: 05/31/2018] [Indexed: 06/08/2023]
Abstract
The aim of this work was to investigate the environmental performance of different tobacco stalk methods using Life Cycle Assessment (LCA). Three scenarios were established: biodegradable plant nursery tray (PNT) making, open burning, and indoor incineration. The results showed that 3380, 1590, 1320 kg CO2-eq, 25.7, 1.97,1.99 kg SO2-eq are generated for global warming and acidification in biodegradable PNT making, open burning, and indoor incineration scenarios respectively. The overall environmental impact for biodegradable PNT making is higher than that of open burning, and indoor incineration. The dominant factors contributing to environmental impact in biodegradable PNT making include electricity consumption, solid waste landfill etc. Through technical optimization, the environmental impact of biodegradable PNT making could be reduced greatly. Biodegradable PNT making with tobacco stalk, which follows the cyclic economy principles of maximum material utilization and waste minimization, provides an alternative for agricultural residue utilization.
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Affiliation(s)
- Zuodong Qin
- Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South, College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China; Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Mingxing Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3) and Tyndall Center, Department of Environmental Science & Engineering, Fudan University, Shanghai 200438, China
| | - Xiaofang Luo
- Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South, College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
| | - Hongrui Zhang
- Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South, College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
| | - Jiyong Xie
- Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South, College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
| | - Haifeng Chen
- Key Laboratory of Comprehensive Utilization of Advantage Plants Resources in Hunan South, College of Chemistry and Bioengineering, Hunan University of Science and Engineering, Yongzhou 425100, China
| | - Lirong Yang
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Lei Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
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27
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Zhang H, Li J, Huang G, Yang Z, Han L. Understanding the synergistic effect and the main factors influencing the enzymatic hydrolyzability of corn stover at low enzyme loading by hydrothermal and/or ultrafine grinding pretreatment. BIORESOURCE TECHNOLOGY 2018; 264:327-334. [PMID: 29885582 DOI: 10.1016/j.biortech.2018.05.090] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 05/22/2018] [Accepted: 05/24/2018] [Indexed: 05/26/2023]
Abstract
A thorough assessment of the microstructural changes and synergistic effects of hydrothermal and/or ultrafine grinding pretreatment on the subsequent enzymatic hydrolysis of corn stover was performed in this study. The mechanism of pretreatment was elucidated by characterizing the particle size, specific surface area (SSA), pore volume (PV), average pore size, cellulose crystallinity (CrI) and surface morphology of the pretreated samples. In addition, the underlying relationships between the structural parameters and final glucose yields were elucidated, and the relative significance of the factors influencing enzymatic hydrolyzability were assessed by principal component analysis (PCA). Hydrothermal pretreatment at a lower temperature (170 °C) combined with ultrafine grinding achieved a high glucose yield (80.36%) at a low enzyme loading (5 filter paper unit (FPU)/g substrate) which is favorable. The relative significance of structural parameters in enzymatic hydrolyzability was SSA > PV > average pore size > CrI/cellulose > particle size. PV and SSA exhibited logarithmic correlations with the final enzymatic hydrolysis yield.
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Affiliation(s)
- Haiyan Zhang
- College of Engineering, China Agricultural University (East Campus), 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China
| | - Junbao Li
- College of Engineering, China Agricultural University (East Campus), 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China
| | - Guangqun Huang
- College of Engineering, China Agricultural University (East Campus), 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China
| | - Zengling Yang
- College of Engineering, China Agricultural University (East Campus), 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China
| | - Lujia Han
- College of Engineering, China Agricultural University (East Campus), 17 Qing-Hua-Dong-Lu, Hai-Dian District, Beijing 100083, PR China.
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28
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Gullón B, Eibes G, Dávila I, Moreira MT, Labidi J, Gullón P. Hydrothermal treatment of chestnut shells (Castanea sativa) to produce oligosaccharides and antioxidant compounds. Carbohydr Polym 2018; 192:75-83. [DOI: 10.1016/j.carbpol.2018.03.051] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 02/08/2018] [Accepted: 03/16/2018] [Indexed: 11/30/2022]
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29
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Zhang H, Liu X, Li J, Jiang Z, Hu C. Performances of Several Solvents on the Cleavage of Inter- and Intramolecular Linkages of Lignin in Corncob Residue. CHEMSUSCHEM 2018. [PMID: 29542869 DOI: 10.1002/cssc.201800309] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The performances of solvents, including γ-butyrolactone (GBL), γ-valerolactone (GVL), tetrahydrofuran (THF), ethyl acetate (EAC), 2-methyltetrahydrofuran (2-MeTHF), and the corresponding mixtures with H2 O, on the cleavage of inter- and intramolecular linkages of lignin in corncob residue were investigated. At 200 °C, miscible cosolvents (H2 O-GBL, H2 O-GVL, and H2 O-THF) exhibited much better efficiency for lignin dissolution than that of both immiscible cosolvents (H2 O-EAC and H2 O-2-MeTHF) and pure solvents. The synergetic effect between H2 O and organic solvent significantly promoted the breakage of intermolecular linkages between C6-O-H of amorphous cellulose and lignin. GBL and THF solvents preferentially dissolved lignin with H and G units, whereas GVL, EAC, and 2-MeTHF solvents exhibited high selectivity for the dissolution of lignin with S and G units. In addition to dissolution, the intramolecular β-O-4 linkage in lignin could be selectively cleaved in H2 O-GBL cosolvent, whereas the β-O-4, α-O-4, and β-5 linkages were cleaved in H2 O-EAC, H2 O-THF, and H2 O-2-MeTHF cosolvents. At 300 °C, the breakage of the β-γ bond prior to β-O-4 in H2 O-GBL, H2 O-THF, H2 O-EAC, and H2 O-2-MeTHF produced 4-ethylphenol and 4-ethylguaiacol selectively (accounting for ≈70 % of the total identified monophenols), whereas the α-1 bond was preferably broken in H2 O-GVL to form guaiacol (accounting for ≈75 % of the total identified monophenols).
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Affiliation(s)
- Hui Zhang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Xudong Liu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Jianmei Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Zhicheng Jiang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, PR China
| | - Changwei Hu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064, PR China
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30
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Xu Y, Zhang M, Roozeboom K, Wang D. Integrated bioethanol production to boost low-concentrated cellulosic ethanol without sacrificing ethanol yield. BIORESOURCE TECHNOLOGY 2018; 250:299-305. [PMID: 29174908 DOI: 10.1016/j.biortech.2017.11.056] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/16/2017] [Accepted: 11/17/2017] [Indexed: 06/07/2023]
Abstract
Four integrated designs were proposed to boost cellulosic ethanol titer and yield. Results indicated co-fermentation of corn flour with hydrolysate liquor from saccharified corn stover was the best integration scheme and able to boost ethanol titers from 19.9 to 123.2 g/L with biomass loading of 8% and from 36.8 to 130.2 g/L with biomass loadings of 16%, respectively, while meeting the minimal ethanol distillation requirement of 40 g/L and achieving high ethanol yields of above 90%. These results indicated integration of first and second generation ethanol production could significantly accelerate the commercialization of cellulosic biofuel production. Co-fermentation of starchy substrate with hydrolysate liquor from saccharified biomass is able to significantly enhance ethanol concentration to reduce energy cost for distillation without sacrificing ethanol yields. This novel method could be extended to any pretreatment of biomass from low to high pH pretreatment as demonstrated in this study.
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Affiliation(s)
- Youjie Xu
- Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, United States
| | - Meng Zhang
- Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS 66506, United States
| | - Kraig Roozeboom
- Department of Agronomy, Kansas State University, Manhattan, KS 66506, United States
| | - Donghai Wang
- Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506, United States.
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31
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Investigation of optimal conditions for production of highly crystalline nanocellulose with increased yield via novel Cr(III)-catalyzed hydrolysis: Response surface methodology. Carbohydr Polym 2017; 178:57-68. [DOI: 10.1016/j.carbpol.2017.09.029] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 09/07/2017] [Accepted: 09/09/2017] [Indexed: 11/20/2022]
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32
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Wood IP, Garcia-Gutierrez E, Wellner N, Waldron KW. Feedstock selection for polymer and chemical production: feedstock-specific recalcitrance. Faraday Discuss 2017; 202:391-402. [PMID: 28682402 DOI: 10.1039/c7fd00044h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Plant cell wall materials derived from a range of waste biomass sources have great potential as a source of sustainable alternatives to petrochemicals. Perhaps the most straightforward way of realising this potential would be to hydrolyse the most efficiently fermentable polymers into their constituent sugars and use yeast to ferment these into useful chemicals. However, it also makes sense to pre-extract components which have a greater value in polymeric form. This is particularly true for non-cellulosic polymers, which are rich in poorly-fermentable pentose sugars. Liquid hot water (LHW) pretreatment can be used to extract non-cellulosic carbohydrates in a cost-effective manner, leaving a cellulose-rich substrate which is easier to hydrolyse using commercial cellulases. However, inherent differences in the plant cell wall structure and composition mean that some biomass sources may be more suitable for exploitation than others. Here, we examine eight different feedstocks (two each from hardwood, softwood, cereal straws and dicotyledonous crops), expose them to 26 different LHW pretreatment conditions and hydrolyse the entire pretreated slurry with a commercial cellulase. This enables side-by-side comparisons, in terms of saccharification yield, of the feedstocks. The results clearly demonstrate considerable differences in suitability between the feedstocks, in relation to the quantity of products released and the processes needed to obtain them.
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Affiliation(s)
- Ian P Wood
- Quadram Institute Bioscience, Norwich Research Park, Colney, Norwich NR47UA, UK.
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33
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Lyu H, Lv C, Zhang M, Liu J, Meng F, Geng ZF. Kinetic studies of the strengthening effect on liquid hot water pretreatments by organic acids. BIORESOURCE TECHNOLOGY 2017; 235:193-201. [PMID: 28365347 DOI: 10.1016/j.biortech.2017.03.115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 03/18/2017] [Accepted: 03/20/2017] [Indexed: 06/07/2023]
Abstract
The liquid hot water (LHW) pretreatments would be accelerated by the organic acids produced from the process. In the study, the organic acids included not only acetic acid but also lactic acid during LHW hydrolysis of reeds, at 180-220°C and for 15-135min. The lactic acid was presumably produced from xylose degradation in the pretreatment process. The different organic acids, such as acetic acid, lactic acid and acetic-lactic acids, were used to strengthen the LHW pretreatments for increasing xylose production. Moreover, the work presented kinetic models of xylose and hemicellulose at different conditions, considering the generation of lactic acid. The experimental and kinetic results both indicated that acetic-lactic acids had synergistic catalytic effect on the reaction, which could not only inhibit the degradation of xylose, but also promote the hydrolysis of hemicellulose. Besides, the highest concentration of xylose of 7.323g/L was obtained at 200°C, for 45min and with 1wt% acetic-lactic acids.
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Affiliation(s)
- Huisheng Lyu
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China
| | - Chunliu Lv
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China
| | - Minhua Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China.
| | - Jiatao Liu
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China
| | - Fanmei Meng
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China
| | - Zhong Feng Geng
- Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University R&D Center for Petrochemical Technology, Tianjin 300072, China
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34
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Effect of hydrothermal pretreatment on the structural changes of alkaline ethanol lignin from wheat straw. Sci Rep 2016; 6:39354. [PMID: 27982101 PMCID: PMC5159836 DOI: 10.1038/srep39354] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 11/22/2016] [Indexed: 11/18/2022] Open
Abstract
Due to the enormous abundance of lignin and its unique aromatic nature, lignin has great potential for the production of industrially useful fuels, chemicals, and materials. However, the rigid and compact structure of the plant cell walls significantly blocks the separation of lignin. In this study, wheat straw was hydrothermally pretreated at different temperatures (120–200 °C) followed by post-treatment with 70% ethanol containing 1% NaOH to improve the isolation of lignin. Results demonstrated that the content of associated carbohydrates of the lignin fractions was gradually reduced with the increment of the hydrothermal severity. The structure of the lignins changed regularly with the increase of the pretreatment temperature from 120 to 200 °C. In particular, the contents of β-O-4′, β-β′, β-5′ linkages and aliphatic OH in the lignins showed a tendency of decrease, while the content of phenolic OH and thermal stability of the lignin fractions increased steadily as the increment of the pretreatment temperature.
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