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https://www.readbyqxmd.com/read/28225212/one-pot-process-for-hydrodeoxygenation-of-lignin-to-alkanes-using-ru-based-bimetallic-and-bifunctional-catalysts-supported-on-zeolite-y
#1
Hongliang Wang, Hao Ruan, Maoqi Feng, Yuling Qin, Heather M Job, Langli Luo, Chongmin Wang, Mark H Engelhard, Erik Kuhn, Xiaowen Chen, Melvin P Tucker, Bin Yang
The synthesis of high-efficiency and low-cost catalysts for hydrodeoxygenation (HDO) of waste lignin into advanced biofuels is crucial for enhancing current biorefinery processes. Inexpensive transition metals, including Fe, Ni, Cu, Zn, were severally co-loaded with Ru on HY zeolite to form bimetallic and bifunctional catalysts. These catalysts were subsequently tested for HDO conversion of softwood lignin and several lignin model compounds. Results indicated that the inexpensive earth abundant metals could modulate the hydrogenolysis activity of Ru and decrease the yield of low molecular weight gaseous products...
February 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28222385/the-effects-of-autohydrolysis-pretreatment-on-the-structural-characteristics-adsorptive-and-catalytic-properties-of-the-activated-carbon-prepared-from-eucommia-ulmoides-oliver-based-on-a-biorefinery-process
#2
Ming-Qiang Zhu, Zhi-Wen Wang, Jia-Long Wen, Ling Qiu, Ya-Hong Zhu, Yin-Quan Su, Qin Wei, Run-Cang Sun
Eucommia ulmoides Oliver (EU) wood was consecutively treated by autohydrolysis pretreatment and chemical carbonization post-treatment based on a biorefinery process. Results showed that the optimal condition of the autohydrolysis pretreatment and carbonization process yielded 10.37kg xylooligosaccharides (XOS), 1.39kg degraded hemicellulosic products, 17.29kg other degraded products from hemicelluloses and 40.72kg activated carbon (SBET of 1534.06m(2)/g) from the 100kg raw materials. Simultaneously, 29.14kg gas products generated from the optimum integrated process was significantly lower than that from the direct carbonization process (68...
February 11, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28203276/a-biorefinery-scheme-to-fractionate-bamboo-into-high-grade-dissolving-pulp-and-ethanol
#3
Zhaoyang Yuan, Yangbing Wen, Nuwan Sella Kapu, Rodger Beatson, D Mark Martinez
BACKGROUND: Bamboo is a highly abundant source of biomass which is underutilized despite having a chemical composition and fiber structure similar as wood. The main challenge for the industrial processing of bamboo is the high level of silica, which forms water-insoluble precipitates negetively affecting the process systems. A cost-competitive and eco-friendly scheme for the production of high-purity dissolving grade pulp from bamboo not only requires a process for silica removal, but also needs to fully utilize all of the materials dissolved in the process which includes lignin, and cellulosic and hemicellulosic sugars as well as the silica...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28193328/engineering-neurospora-crassa-for-cellobionate-production-directly-from-cellulose-without-any-enzyme-addition
#4
Hui Lin, Amanda Hildebrand, Takao Kasuga, Zhiliang Fan
In a cellulosic biorefinery, the cellulase enzymes needed for hydrolysis are one of the major contributors to high processing costs, while the hydrolysis product, cellobiose, has strong inhibition to the cellulases. In this study, we report engineering recombinant Neurospora crassa strains which are able to produce cellobionate, an organic acid, from cellulose without any enzyme addition. Recombinant strains were constructed by heterologously expressing laccase genes from different sources under different promoters in N...
April 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28188654/dry-matter-yield-chemical-composition-and-estimated-extractable-protein-of-legume-and-grass-species-during-the-spring-growth
#5
Zeinab Solati, Uffe Jørgensen, Jørgen Eriksen, Karen Søegaard
BACKGROUND: Knowledge of the variation of extractable protein amount in legumes and grasses as affected by harvest time is important for identifying optimal combinations to enable a high protein production in a bioefinery. The extractability of protein was estimated using the Cornell Net Carbohydrate and Protein System across six harvests during the spring growth. RESULTS: The estimated extractable protein (g CP kg(-1) DM) defined as the easily available fractions B1 +B2 was significantly higher in white clover and lucerne at all harvests whilst if the more cell wall attached fraction B3 can be extracted, white clover had the highest extractable protein amongst all species...
February 11, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28184245/development-of-a-low-cost-cellulase-production-process-using-trichoderma-reesei-for-brazilian-biorefineries
#6
Simo Ellilä, Lucas Fonseca, Cristiane Uchima, Junio Cota, Gustavo Henrique Goldman, Markku Saloheimo, Vera Sacon, Matti Siika-Aho
BACKGROUND: During the past few years, the first industrial-scale cellulosic ethanol plants have been inaugurated. Although the performance of the commercial cellulase enzymes used in this process has greatly improved over the past decade, cellulases still represent a very significant operational cost. Depending on the region, transport of cellulases from a central production facility to a biorefinery may significantly add to enzyme cost. The aim of the present study was to develop a simple, cost-efficient cellulase production process that could be employed locally at a Brazilian sugarcane biorefinery...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28176878/cofactor-recycling-for-co-production-of-1-3-propanediol-and-glutamate-by-metabolically-engineered-corynebacterium-glutamicum
#7
Jinhai Huang, Yao Wu, Wenjun Wu, Ye Zhang, Dehua Liu, Zhen Chen
Production of 1,3-propanediol (1,3-PDO) from glycerol is a promising route toward glycerol biorefinery. However, the yield of 1,3-PDO is limited due to the requirement of NADH regeneration via glycerol oxidation process, which generates large amounts of undesired byproducts. Glutamate fermentation by Corynebacterium glutamicum is an important oxidation process generating excess NADH. In this study, we proposed a novel strategy to couple the process of 1,3-PDO synthesis with glutamate production for cofactor regeneration...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28174601/development-of-a-genetically-programed-vanillin-sensing-bacterium-for-high-throughput-screening-of-lignin-degrading-enzyme-libraries
#8
Barindra Sana, Kuan Hui Burton Chia, Sarada S Raghavan, Balamurugan Ramalingam, Niranjan Nagarajan, Jayasree Seayad, Farid J Ghadessy
BACKGROUND: Lignin is a potential biorefinery feedstock for the production of value-added chemicals including vanillin. A huge amount of lignin is produced as a by-product of the paper industry, while cellulosic components of plant biomass are utilized for the production of paper pulp. In spite of vast potential, lignin remains the least exploited component of plant biomass due to its extremely complex and heterogenous structure. Several enzymes have been reported to have lignin-degrading properties and could be potentially used in lignin biorefining if their catalytic properties could be improved by enzyme engineering...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28169025/carbon-dioxide-co2-biofixation-by-microalgae-and-its-potential-for-biorefinery-and-biofuel-production
#9
Mohd Asyraf Kassim, Tan Keang Meng
Carbon dioxide (CO2) using biological process is one of the promising approaches for CO2 capture and storage. Recently, biological sequestration using microalgae has gained many interest due to its capability to utilize CO2 as carbon source and biomass produced can be used as a feedstock for other value added product for instance biofuel and chemicals. In this study, the CO2 biofixation by two microalgae species, Chlorella sp. and Tetraselmis suecica was investigated using different elevated CO2 concentration...
February 4, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28162762/anaerobic-digestion-of-hemicellulose-hydrolysate-produced-after-hydrothermal-pretreatment-of-sugarcane-bagasse-in-uasb-reactor
#10
Fernanda Resende Ribeiro, Fabiana Passos, Leandro Vinícius Alves Gurgel, Bruno Eduardo Lobo Baêta, Sérgio Francisco de Aquino
In the context of a sugarcane biorefinery, sugarcane bagasse produced may be pretreated generating a solid and liquid fraction. The solid fraction may be used for 2G bioethanol production, while the liquid fraction may be used to produce biogas through anaerobic digestion. The aim of this study consisted in evaluating the anaerobic digestion performance of hemicellulose hydrolysate produced after hydrothermal pretreatment of sugarcane bagasse. For this, hydrothermal pretreatment was assessed in a continuous upflow anaerobic sludge blanket (UASB) reactor operated at a hydraulic retention time (HRT) of 18...
February 3, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28160118/production-of-chemicals-from-c1-gases-co-co2-by-clostridium-carboxidivorans
#11
REVIEW
Ánxela Fernández-Naveira, Haris Nalakath Abubackar, María C Veiga, Christian Kennes
Bioprocesses in conventional second generation biorefineries are mainly based on the fermentation of sugars obtained from lignocellulosic biomass or agro-industrial wastes. An alternative to this process consists in gasifying those same feedstocks or even other carbon-containing materials to obtain syngas which can also be fermented by some anaerobic bacteria to produce chemicals or fuels. Carbon monoxide, carbon dioxide and hydrogen, which are the main components of syngas, are also found in some industrial waste gases, among others in steel industries...
March 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28155810/fungal-enzymes-and-yeasts-for-conversion-of-plant-biomass-to-bioenergy-and-high-value-products
#12
Lene Lange
Fungi and fungal enzymes play important roles in the new bioeconomy. Enzymes from filamentous fungi can unlock the potential of recalcitrant lignocellulose structures of plant cell walls as a new resource, and fungi such as yeast can produce bioethanol from the sugars released after enzyme treatment. Such processes reflect inherent characteristics of the fungal way of life, namely, that fungi as heterotrophic organisms must break down complex carbon structures of organic materials to satisfy their need for carbon and nitrogen for growth and reproduction...
January 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28114419/whole-proteome-analyses-on-ruminiclostridium-cellulolyticum-show-a-modulation-of-the-cellulolysis-machinery-in-response-to-cellulosic-materials-with-subtle-differences-in-chemical-and-structural-properties
#13
Nelly Badalato, Alain Guillot, Victor Sabarly, Marc Dubois, Nina Pourette, Bruno Pontoire, Paul Robert, Arnaud Bridier, Véronique Monnet, Diana Z Sousa, Sylvie Durand, Laurent Mazéas, Alain Buléon, Théodore Bouchez, Gérard Mortha, Ariane Bize
Lignocellulosic materials from municipal solid waste emerge as attractive resources for anaerobic digestion biorefinery. To increase the knowledge required for establishing efficient bioprocesses, dynamics of batch fermentation by the cellulolytic bacterium Ruminiclostridium cellulolyticum were compared using three cellulosic materials, paper handkerchief, cotton discs and Whatman filter paper. Fermentation of paper handkerchief occurred the fastest and resulted in a specific metabolic profile: it resulted in the lowest acetate-to-lactate and acetate-to-ethanol ratios...
2017: PloS One
https://www.readbyqxmd.com/read/28107722/microalgae-biorefinery-high-value-products-perspectives
#14
Kit Wayne Chew, Jing Ying Yap, Pau Loke Show, Ng Hui Suan, Joon Ching Juan, Tau Chuan Ling, Duu-Jong Lee, Jo-Shu Chang
Microalgae have received much interest as a biofuel feedstock in response to the uprising energy crisis, climate change and depletion of natural sources. Development of microalgal biofuels from microalgae does not satisfy the economic feasibility of overwhelming capital investments and operations. Hence, high-value co-products have been produced through the extraction of a fraction of algae to improve the economics of a microalgae biorefinery. Examples of these high-value products are pigments, proteins, lipids, carbohydrates, vitamins and anti-oxidants, with applications in cosmetics, nutritional and pharmaceuticals industries...
April 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28096492/identification-of-glutaminyl-cyclase-genes-involved-in-pyroglutamate-modification-of-fungal-lignocellulolytic-enzymes
#15
Vincent W Wu, Craig M Dana, Anthony T Iavarone, Douglas S Clark, N Louise Glass
: The breakdown of plant biomass to simple sugars is essential for the production of second-generation biofuels and high-value bioproducts. Currently, enzymes produced from filamentous fungi are used for deconstructing plant cell wall polysaccharides into fermentable sugars for biorefinery applications. A post-translational N-terminal pyroglutamate modification observed in some of these enzymes occurs when N-terminal glutamine or glutamate is cyclized to form a five-membered ring. This modification has been shown to confer resistance to thermal denaturation for CBH-1 and EG-1 cellulases...
January 17, 2017: MBio
https://www.readbyqxmd.com/read/28081523/enhanced-enzymatic-hydrolysis-and-acetone-butanol-ethanol-fermentation-of-sugarcane-bagasse-by-combined-diluted-acid-with-oxidate-ammonolysis-pretreatment
#16
Hailong Li, Lian Xiong, Xuefang Chen, Can Wang, Gaoxiang Qi, Chao Huang, Mutan Luo, Xinde Chen
This study aims to propose a biorefinery pretreatment technology for the bioconversion of sugarcane bagasse (SB) into biofuels and N-fertilizers. Performance of diluted acid (DA), aqueous ammonia (AA), oxidate ammonolysis (OA) and the combined DA with AA or OA were compared in SB pretreatment by enzymatic hydrolysis, structural characterization and acetone-butanol-ethanol (ABE) fermentation. Results indicated that DA-OA pretreatment improves the digestibility of SB by sufficiently hydrolyzing hemicellulose into fermentable monosaccharides and oxidating lignin into soluble N-fertilizer with high nitrogen content (11...
March 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28070222/scale-up-and-process-integration-of-sugar-production-by-acidolysis-of-municipal-solid-waste-corn-stover-blends-in-ionic-liquids
#17
Chenlin Li, Ling Liang, Ning Sun, Vicki S Thompson, Feng Xu, Akash Narani, Qian He, Deepti Tanjore, Todd R Pray, Blake A Simmons, Seema Singh
BACKGROUND: Lignocellulosic biorefineries have tonnage and throughput requirements that must be met year round and there is no single feedstock available in any given region that is capable of meeting the price and availability demands of the biorefineries scheduled for deployment. Significant attention has been historically given to agriculturally derived feedstocks; however, a diverse range of wastes, including municipal solid wastes (MSW), also have the potential to serve as feedstocks for the production of advanced biofuels and have not been extensively studied...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28061395/microalgae-cultivation-in-sugarcane-vinasse-selection-growth-and-biochemical-characterization
#18
Hugo Santana, Carolina R Cereijo, Valérya C Teles, Rodrigo C Nascimento, Maiara S Fernandes, Patrícia Brunale, Raquel C Campanha, Itânia P Soares, Flávia C P Silva, Priscila S Sabaini, Félix G Siqueira, Bruno S A F Brasil
Sugarcane ethanol is produced at large scale generating wastes that could be used for microalgae biomass production in a biorefinery strategy. In this study, forty microalgae strains were screened for growth in sugarcane vinasse at different concentrations. Two microalgae strains, Micractinium sp. Embrapa|LBA32 and C. biconvexa Embrapa|LBA40, presented vigorous growth in a light-dependent manner even in undiluted vinasse under non-axenic conditions. Microalgae strains presented higher biomass productivity in vinasse-based media compared to standard Bold's Basal Medium in cultures performed using 15L airlift flat plate photobioreactors...
March 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28054749/efficient-cleavage-of-lignin-carbohydrate-complexes-and-ultrafast-extraction-of-lignin-oligomers-from-wood-biomass-using-microwave-assisted-deep-eutectic-solvent-treatment
#19
Yongzhuang Liu, Wenshuai Chen, Qinqin Xia, Bingtuo Guo, Qingwen Wang, Shouxin Liu, Yixing Liu, Jian Li, Haipeng Yu
Lignocellulosic biomass is an abundant and renewable resource for the production of bio-based material derived value-added fuels, chemicals and materials, but its effective valorisation with an energy-efficient and environment-friendly strategy remains a challenge. Here, we report a facile approach for efficiently cleaving the lignin-carbohydrate complexes and ultrafast fractionating components from wood using microwave-assisted deep eutectic solvent treatment. The solvent was composed of sustainable choline chloride and oxalic acid dihydrate, and showed a hydrogen-bond acidity of 1...
January 5, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28053668/study-of-traits-and-recalcitrance-reduction-of-field-grown-comt-down-regulated-switchgrass
#20
Mi Li, Yunqiao Pu, Chang Geun Yoo, Erica Gjersing, Stephen R Decker, Crissa Doeppke, Todd Shollenberger, Timothy J Tschaplinski, Nancy L Engle, Robert W Sykes, Mark F Davis, Holly L Baxter, Mitra Mazarei, Chunxiang Fu, Richard A Dixon, Zeng-Yu Wang, C Neal Stewart, Arthur J Ragauskas
BACKGROUND: The native recalcitrance of plants hinders the biomass conversion process using current biorefinery techniques. Down-regulation of the caffeic acid O-methyltransferase (COMT) gene in the lignin biosynthesis pathway of switchgrass reduced the thermochemical and biochemical conversion recalcitrance of biomass. Due to potential environmental influences on lignin biosynthesis and deposition, studying the consequences of physicochemical changes in field-grown plants without pretreatment is essential to evaluate the performance of lignin-altered plants...
2017: Biotechnology for Biofuels
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