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Study on the green extraction of corncob xylan by deep eutectic solvent

Grain & Oil Science and Technology 2024年第1期7卷 50-59页

作者： Bingyu Jiao Le Wang Haitao Gui Zifu Ni Rong Du Yuansen Hu School of Biological Engineering National Engineering Research Center of Wheat and Corn Further ProcessingZhengzhou 450001China

Corn as one of the world's major food crops,its by-product corn cob is also rich in ***,the unreasonable utilization of corn cob often causes the environmental pollution,waste of resources and other *** one of the most abundant polymers in nature,xylan is widely used in food,medicine,materials and other *** cob is rich in xylan,which is an ideal raw material for extracting ***,the intractable lignin is covalently linked to xylan,which increases the difficulty of xylan *** has been reported that the deep eutectic solvent(DES)could preferentially dissolve lignin in biomass,thereby dissolving the ***,the xylan in the extract was separated by ethanol precipitation *** xylan precipitate was obtained after centrifugation,while the supernatant was *** components of the supernatant after ethanol precipitation were separated by the rotary *** ethanol,water and DES were collected for the subsequent extraction of corn cob *** this study,a novel way was provided for the green production of corn cob *** DES was used to extract xylan from corn cob which was used as the raw *** effects of solid-liquid ratio,reaction time,reaction temperature and water content of DES on the extraction rate of corn cob xylan were investigated by the single factor ***,the orthogonal test was designed to optimize the xylan extraction *** structure of corn cob xylan was analyzed and *** results showed that the optimum extraction conditions of corn cob xylan were as follows:the ratio of corn cob to DES was 1:15(g:mL),the extraction time was 3 h,the extraction temperature was 60℃,and the water content of DES was 70%.Under these conditions,the extraction rate of xylan was 16.46%.The extracted corn cob xylan was distinctive triple helix of polysaccharide,which was similar to the structure of commercially available *** was effectively and workably extracted from corn

关键词： Corncob Deep eutectic solvent xylan Process optimization Extraction

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Application of Nanopore Single Molecule Detection Technology in Analysis of xylan Dissolved in Ionic Liquid

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中国化学:英文版 2023年第14期41卷 1720-1726页

作者： Wanyi Xie Shaoxi Fang Bohua Yin Rong Tian Liyuan Liang Shixuan He Deqiang Wang Chongqing Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing400714 China Chongqing School University of Chinese Academy of SciencesChongqing400714 China Changchun University of Science and Technology ChangchunJilin130022 China

xylan is the most abundant hemicellulose in nature. As a new type of green organic solvent, ionic liquid shows good preservation ability for the functional groups of hemicellulose. In this paper, a single molecule detection technology based on glass nanopore was established to analyze xylan dissolved in ionic liquid. Arabino-xylan (AX) and beech xylan (BX) are respectively taken as the representatives of heterogeneous xylan and homogeneous xylan. Firstly, unmodified glass nanopore was used to detect the dissolved xylan in ionic liquid, and then poly(ethylene imine) (PEI) was used to modify the nanopore to change the surface charge in the nanopore and further enhance the interaction between the nanopore and the xylan molecule. It was found that before and after nanopore modification, at negative voltage and low positive voltage, AX didn't generate current blocking signal. On the contrary, BX didn't generate current blocking signal at positive voltage. This phenomenon may be due to the current disturbance driven by electrophoresis and electroosmosis of xylan molecules with weak negative charge. After statistics analysis, the current blocking signal of AX showed that the modified nanopore showed multiple peaks. It indicates that heterogeneous xylan and PEI modified nanopore had stronger interaction. The results show that the nanopore detection technology can show the structural difference of heterogenous branched chain and homogeneous straight chain based on the single characteristic current blocking signal and statistical information, providing a research basis for the structural analysis of water insoluble polysaccharides.

关键词： Nanopore xylan BmimCI Surfacecharge PEl

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Optimizing yield and chemical compositions of dimethylsulfoxide-extracted birchwood xylan

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Journal of Bioresources and Bioproducts 2022年第3期7卷 211-219页

作者： Mingquan Zhang Jamshed Bobokalonov Abduvali Dzhonmurodov Zhouyang Xiang State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China V.I.Nikitin Institute of Chemistry National Academy of Sciences of TajikistanDushanbe 734063Tajikistan

Dimethylsulfoxide(DMSO)extraction is commonly used to study the chemical structures of orig-inal xylan in the plant cell wall,since the DMSO can preserve the original structure of the xylan as much as possible during the extracting *** addition,the DMSO-extracted xylans have unique properties allowing their potential applications in emulsifying or filming ***-ever,the yield of DMSO-extracted xylan is always low and the effects of different DMSO extraction conditions on the chemical compositions of xylan have not been fully studied,which greatly hin-ders its researches and *** this study,we have found that extensive delignification before DMSO extraction results in destruction of lignin-carbohydrate complex(LCC),leading to xylan yield and xylose unit content increased by up to 220%and 20%,***-butanol washing of the holocellulose can further increase the DMSO extracted xylan yield by∼10%.The yield of xylan extracted by the DMSO at 80°C for 7 h was obviously higher than that at room temperature for 3 d by 30%-40%.Thermal analysis showed that the xylans extracted at differ-ent conditions had thermal stability without obvious *** results indicate that the DMSO-extracted xylan with a high yield,a high purity and a high degree of acetylation can be ex-tracted at a high delignification level,a high reaction temperature and a short reaction *** study is of great significance for studying xylan structure-property relationships and promoting the applications of DMSO-extracted xylan.

关键词： xylan Dimethylsulfoxide(DMSO)extraction Birchwood Yield Chemical composition

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Role of UDP-Glucuronic Acid Decarboxylase in xylan Biosynthesis in Arabidopsis

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Molecular Plant 2016年第8期9卷 1119-1131页

作者： Beiqing Kuang Xianhai Zhao Chun Zhou Wei Zeng Junli Ren Berit Ebert Cherie T. Beahan Xiaomei Deng Qingyin Zeng Gongke Zhou Monika S. Doblin Joshua L. Heazlewood Antony Bacic Xiaoyang Chen Ai-Min Wu State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources South China Agricultural University Guangzhou 510642 China Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm College of Forestry and Landscape Architecture South China Agricultural University Guangzhou 510642 China ARC Centre of Excellence in Plant Cell Walls School of BioSciences The University of Melbourne ParkviHe VIC 3010 Australia State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou 510640 China Institute of Botany The Chinese Academy of Science Beijing 100093 China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China Joint BioEnergy Institute and Physical Biosciences Division Lawrence Berkeley Nationa Laboratory Berkeley CA 94720 USA Guangdong Province Research Center of woody forage engineering technology Guangzhou 510642 China These authors have contributed equay to this article.

UDP-xylose （UDP-Xyl） is the Xyl donor used in the synthesis of major plant cell-wall polysaccharides such as xylan （as a backbone-chain monosaccharide） and xyloglucan （as a branching monosaccharide）. The biosynthesis of UDP-Xyl from UDP-glucuronic acid （UDP-GIcA） is irreversibly catalyzed by UDP- glucuronic acid decarboxylase （UXS）. Until now, little has been known about the physiological roles of UXS in plants. Here, we report that AtUXS1, AtUXS2, and AtUXS4 are located in the Golgi apparatus whereas AtUXS3, AtUXS5, and AtUXS6 are located in the cytosoh Although all six single AtUXS T-DNA mu- tants and the uxsl usx2 uxs4 triple mutant show no obvious phenotype, the uxs3 uxs5 uxs6 triple mutant has an irregular xylem phenotype. Monosaccharide analysis showed that Xyl levels decreased in uxs3 uxs5 uxs6 and linkage analysis confirmed that the xylan content in uxs3 xus5 uxs6 declined, indicating that UDP-Xyl from cytosol AtUXS participates in xylan synthesis. Gel-permeation chromatography showed that the molecular weight of non-cellulosic polysaccharides in the triple mutants, mainly composed of xylans, is lower than that in the wild type, suggesting an effect on the elongation of the xylan backbone. Upon saccharification treatment stems of the uxs3 uxs5 uxs6 triple mutants released monosaccharides with a higher efficiency than those of the wild type. Taken together, our results indicate that the cytosol UXS plays a more important role than the Golgi-localized UXS in xylan biosynthesis.

关键词： UDP-Xylose xylan UDP-Glucuronic acid decarboxylase localization

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Mechanism of xylan Pyrolysis by Py-GC/MS

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Chemical Research in Chinese Universities 2013年第4期29卷 782-787页

作者： WANG Shu-rong LIANG Tao RU Bin GUO Xiu-juan State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 P. R. China

In order to investigate the decomposition behavior of hemicellulose, xylan was chosen as the representative of hemicellulose to study the fast pyrolysis on the combination system of analytical pyrolyzer and gas chromatograph coupled with mass spectrometer（Py-GC/MS）. The main condensable products of xylan pyrolysis consisted of acids, al- dehydes, and ketones; while gas products contained CO2, CO, CH4 and H〉 Acetic acid and furfural were the most abun- dant products with the highest contents of 20.11% and 20.24% respectively. While furfural and acetic acid were formed competitively with residence time and temperature increases, the distribution of xylan pyrolysis products did not vary with the residence time and temperature, while the total content of several kinds of products changed a lot. According to the analysis of experimental data, a reaction pathway of xylan decomposition was deduced so as to illustrate the forma- tion mechanism of main products.

关键词： xylan Pyrolysis Py-GC/MS Acetic acid Furfural

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High Oxygen Nanocomposite Barrier Films Based on xylan and Nanocrystalline Cellulose

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Nano-Micro Letters 2010年第4期2卷 235-241页

作者： Amit Saxena Thomas J.Elder Jeffrey Kenvin Arthur J.Ragauskas School of Chemistry and Biochemistry Georgia Institute of Technology USDA-Forest Service Southern Research Station Micromeritics Instrument Corporation

The goal of this work is to produce nanocomposite film with low oxygen permeability by casting an aqueous solution containing xylan,sorbitol and nanocrystalline *** morphology of the resulting nanocomposite films was examined by scanning electron microscopy and atomic force microscopy which showed that control films containing xylan and sorbitol had a more open structure as compared to xylan-sorbitol films containing sulfonated nanocrystalline *** average pore diameter,bulk density,porosity and tortuosity factor measurements of control xylan films and nanocomposite xylan films were examined by mercury intrusion porosimetry *** films reinforced with nanocrystalline cellulose were denser and exhibited higher tortuosity factor than the control xylan *** xylan films had average pore diameter,bulk density,porosity and tortuosity factor of 0.1730 μm,0.6165 g/ml,53.0161% and 1.258,respectively as compared to xylan films reinforced with 50% nanocrystalline cellulose with average pore diameter of 0.0581 μm,bulk density of 1.1513 g/ml,porosity of 22.8906% and tortuosity factor of *** transmission rate tests demonstrated that films prepared with xylan,sorbitol and 5%,10%,25% and 50% sulfonated nanocrystalline cellulose exhibited a significantly reduced oxygen permeability of 1.1387,1.0933,0.8986 and 0.1799 cm^3×μm/m^2×d×k Pa respectively with respect to films prepared solely from xylan and sorbitol with a oxygen permeability of 189.1665 cm^3×μm/m^2×d×k *** properties suggested these nanocomposite films have promising barrier properties.

关键词： Nanocomposites xylan Nanocrystalline cellulose Oxygen barrier

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Facile Approach for Preparation of xylan-based Double-network Hydrogels

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Paper And Biomaterials 2022年第1期7卷 19-27页

作者： Ziwen Lyu Jun Rao Xianming Qi Ziyi Bai Siyu Jia Zhenhua Su Feng Peng Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijing100083China China National Pulp and Paper Research Institute Co. Ltd.Beijing100102China

In this study,xylan-based double-network(DN)hydrogels(xylanbased DN gels)with excellent mechanical properties were prepared using acrylic acid and acrylamide(AM)based on a DN *** first layer network was obtained by grafting and crosslinking polyacrylic acid(PAA)molecular chains onto xylan with ammonium persulfate(APS)as the initiator and N,N'-methylenebisacrylamide(MBA)as the crosslinking agent;this network was subsequently immersed into an aqueous AM monomer in the presence of APS and MBA for the preparation of the second layer *** results showed that the double networks were crosslinked by covalent bonds and that the mechanical properties of the xylan-based DN gels were ***,the xylan-based DN gels exhibited a maximum compression stress of 24.9 *** xylan-based DN gels could also recover 97%of their original height after 15 repeated compression cycles;this indicates that the xylan-based DN gels possessed high resistance to friction and ***,the prepared xylan-based DN gels have considerable potential for tissue engineering applications.

关键词： xylan DN gels mechanical property tissue engineering

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Conversion of xylose and xylan into furfural in biorenewable choline chloride–oxalic acid deep eutectic solvent with the addition of metal chloride

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Chinese Chemical Letters 2014年第8期25卷 1132-1136页

作者： Lu-Xin Zhang Han Yu Hong-Bing Yu Ze Chen Lei Yang College of Environmental Science and Engineering Nankai University College of Chemistry Nankai University

An environmentally benign processing approach for furfural production from xylose and xylan under very mild conditions（353–373 K） was developed with the addition of metal chlorides in ChCl–oxalic acid（a deep eutectic solvent（DES）） synthesized from cheap and renewable starting materials）. ChCl–oxalic acid acted as both a Br？nsted acid catalyst and a reaction medium in this catalytic route. In addition, a biphasic system with methyl isobutyl ketone as an extracting reagent（DES/MIBK） to further increase furfural yield was also proposed. This processing approach for producing furfural eliminated the large energy consumption for high pressure saturated steam and the generation of acidic effluent, which was very difficult to handle. The whole catalytic system was more environmentally friendly compared with the commercial process for furfural production.

关键词： Furfural Xylose xylan

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Effects of protein and lignin on cellulose and xylan anaylses of lignocellulosic biomass

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Journal of Integrative Agriculture 2017年第6期16卷 1268-1275页

作者： James MacLellan Rui Chen Zhengbo Yue Robert Kraemer Yan Liu Wei Liao Department of Biosystems and Agricultural Engineering Michigan State University School of Resources and Environmental Engineering Hefei University of Technology

Interactions of lignocellulosic components during fiber analysis were investigated using the highly adopted compositional analysis procedure from the National Renewable Energy Laboratory（NREL）,*** feedstock samples were used to study the effects of lignin/protein,cellulose/protein,and xylan/protein interaction on carbohydrate *** structural influence in the synthetic samples,lignin and protein components were the most significant（P〈0.05）factors on cellulose *** xylan was consistent and unaffected by content variation throughout the synthetic *** of the observed relationships from synthetic feedstocks was fulfilled using real lignocellulosic feedstocks：corn stover,poplar,and alfalfa,in which similar results have been obtained,excluding cellulose analysis of poplar under higher protein content and xylan analysis of alfalfa under higher protein *** results elucidated that according to their protein and lignin contents of different lignocellulosic materials,accuracy of the NREL method on cellulose and xylan analyses could be improved by applying a stronger extraction step to replace water/ethanol extraction.

关键词： lignocellulosic biomass cellulose xylan lignin protein

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Expedited extraction of xylan from corncob by power ultrasound

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International Journal of Agricultural and Biological Engineering 2009年第4期2卷 76-83页

作者： Wade Yang Vishnu K.Ajapur Kathiravan Krishnamurthy Hao Feng Ruijin Yang Taha M.Rababah Department of Food Science and Human Nutrition University of FloridaGainesvilleFL 32611USA Department of Food and Animal Sciences Alabama A&M UniversityNormalAL 35762USA Illinois Institute of Technology Summit-ArgoIL 60501USA Department of Food Science and Human Nutrition University of Illinois at Urbana-ChampaignUrbanaIL 61801USA School of Food Science and Technology Southern Yangtze UniversityWuxi 214036China Department of Food Science and Human Nutrition Jordan University of Science and TechnologyIrbid22110Jordan

Some lignocellulosic biomass like corncob contains a large amount of xylan,a valuable material for applications in food,chemical and pharmaceutical *** extraction of xylan is a time consuming process,requiring 12 to 24 hours to *** this study,the efficacy of power ultrasound for reducing the extraction time and increasing the xylan yield was *** acoustic energy densities(0.18 W/mL and 0.45 W/mL)of the power ultrasound were applied to corncob for 10,20,30,and 60 *** treated samples were steamed at 110,118 and 121℃for 30 *** 0.45 W/mL acoustic energy density and 121℃steaming temperature,ultrasonic treatment was able to extract 39%of xylan in 43 *** contrast,the conventional treatment was able to extract only 34%of xylan in 24 *** ultrasound assisted extraction reduced the processing time by 97%in addition to yield increase by 14.7%.Power ultrasound can be a potential technology for enhanced xylan extraction from corncob to result in significant processing time savings.

关键词： Power ultrasound sonication lignocellulusic biomass xylan extraction corncob steaming

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