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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...
January 4, 2017: Bioresource Technology
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
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...
December 23, 2016: Bioresource Technology
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
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
Robson Tramontina, João Paulo L Franco Cairo, Marcelo V Liberato, Fernanda Mandelli, Amanda Sousa, Samantha Santos, Sarita Cândida Rabelo, Bruna Campos, Jaciane Ienczak, Roberto Ruller, André R L Damásio, Fabio Marcio Squina
BACKGROUND: In nature, termites can be considered as a model biological system for biofuel research based on their remarkable efficiency for lignocellulosic biomass conversion. Redox enzymes are of interest in second-generation ethanol production because they promote synergic enzymatic activity with classical hydrolases for lignocellulose saccharification and inactivate fermentation inhibitory compounds produced after lignocellulose pretreatment steps. RESULTS: In the present study, the biochemical and structural characteristics of the Coptotermes gestroi aldo-keto reductase (CgAKR-1) were comprehensively investigated...
2017: Biotechnology for Biofuels
Nanditha Murali, Sebastian Fernandez, Birgitte Kiaer Ahring
Volatile fatty acids (VFA) have been used as platform molecules for production of biofuels and bioproducts. In the current study, we examine the VFA production from wet-exploded corn stover through anaerobic fermentation using rumen bacteria. The total VFA yield (acetic acid equivalents) was found to increase from 22.8g/L at 2.5% total solids (TS) to 40.8g/L at 5% TS. It was found that the acetic acid concentration increased from 10g/L to 22g/L at 2.5% and 5% TS, respectively. An increased propionic acid production was seen between day 10 and 20 at 5% TS...
March 2017: Bioresource Technology
Pornkamol Unrean
We have previously developed a dynamic flux balance analysis of Saccharomyces cerevisiae for elucidation of genome-wide flux response to furfural perturbation (Unrean and Franzen, Biotechnol J 10(8):1248-1258, 2015). Herein, the dynamic flux distributions were analyzed by flux control analysis to identify target overexpressed genes for improved yeast robustness against furfural. The flux control coefficient (FCC) identified overexpressing isocitrate dehydrogenase (IDH1), a rate-controlling flux for ethanol fermentation, and dicarboxylate carrier (DIC1), a limiting flux for cell growth, as keys of furfural-resistance phenotype...
December 26, 2016: Bioprocess and Biosystems Engineering
Chen-Wei Chang, Colin Webb
Lignocellulosic materials, mostly from agricultural and forestry residues, provide a potential renewable resource for sustainable biorefineries. Reducing sugars can be produced only after a pre-treatment stage, which normally involves chemicals but can be biological. In this case, two steps are usually necessary: solid-state cultivation of fungi for deconstruction, followed by enzymatic hydrolysis using cellulolytic enzymes. In this research, the utilisation of solid-state bioprocessing using the fungus Trichoderma longibrachiatum was implemented as a simultaneous microbial pretreatment and in-situ enzyme production method for fungal autolysis and further enzyme hydrolysis of fermented solids...
March 2017: Bioresource Technology
Ksenia N Sorokina, Oxana P Taran, Tatiana B Medvedeva, Yuliya V Samoylova, Alexandr V Piligaev, Valentin N Parmon
In this study, a combination of catalytic and biotechnological processes was proposed for the first time for application in a cellulose biorefinery for the production of 5-HMF and bioethanol. Hydrolytic dehydration of the mechanically activated microcrystalline cellulose over a carbon-based mesoporous Sibunt-4 catalyst resulted in moderate yields of glucose and 5-HMF (21.1-25.1% and 6.6-9.4%). 5-HMF was extracted from the resulting mixture with isobutanol and subjected to ethanol fermentation. A number of yeast strains were isolated that also revealed high thermotolerance (up to 50°C) and resistance to inhibitors found in the hydrolysates...
December 20, 2016: ChemSusChem
Ana Paula Batista, Emílio Palomo López, Carla Dias, Teresa Lopes da Silva, Isabel Paula Marques
Yeast production and biomass biorefinery processes for lipid and carotenoid extraction generate residues that can be used as substrates for anaerobic digestion. Glucose and carob pulp syrups were used as carbon sources to produce the yeast biomass. The yeast cultivation broth, yeast biomass residues (after carotenoid and lipid extraction) and the carob pulp solid residues obtained from the extraction of sugars were used to produce biogas by applying different Substrate/Inoculum ratios (S/I of 0.5 and 0.75)...
December 2, 2016: Bioresource Technology
Matthias Beller, Gabriele Centi, Licheng Sun
To celebrate the 10 year anniversary of ChemSusChem, we as the chairmen of the editorial board are writing this Essay to summarize important scientific contributions to our journal during the past decade in terms of sustainable science and technology. Bibliometric analysis of published papers show that biorefinery, solar energy conversion, energy-storage materials, and carbon dioxide utilizations attracted most attention in this area. According to our own knowledge and understanding and from the sustainability point of view, we are also pointing out those research directions that we believe can play key roles in the future chemistry to meet the grand challenges in energy and environment...
December 15, 2016: ChemSusChem
A Lavaud, G Pichon, Y Rolland, M Roller, A Bily
No abstract text is available yet for this article.
December 2016: Planta Medica
Yuyuan Xue, Wanshan Liang, Yuan Li, Ying Wu, Xinwen Peng, Xueqing Qiu, Jinbin Liu, Runcang Sun
A water-soluble, ratiometric fluorescent pH probe, L-SRhB, was synthesized via grafting spirolactam Rhodamine B (SRhB) to lignosulfonate (LS). As the ring-opening product of L-SRhB, FL-SRhB was also prepared. The pH-response experiment indicated that L-SRhB showed a rapid response to pH changes from 4.60 to 6.20 with a pKa of 5.35, which indicated that L-SRhB has the potential for pH detection of acidic organelle. In addition, the two probes were internalized successfully by living cells through the endocytosis pathway and could distinguish normal cells from cancer cells by different cell staining rates...
December 28, 2016: Journal of Agricultural and Food Chemistry
Ryan J Stoklosa, Andrea Del Pilar Orjuela, Leonardo da Costa Sousa, Nirmal Uppugundla, Daniel L Williams, Bruce E Dale, David B Hodge, Venkatesh Balan
In this work, corn stover subjected to ammonia fiber expansion (AFEX™)(1) pretreatment or alkaline pre-extraction followed by hydrogen peroxide post-treatment (AHP pretreatment) were compared for their enzymatic hydrolysis yields over a range of solids loadings, enzymes loadings, and enzyme combinations. Process techno-economic models were compared for cellulosic ethanol production for a biorefinery that handles 2000tons per day of corn stover employing a centralized biorefinery approach with AHP or a de-centralized AFEX pretreatment followed by biomass densification feeding a centralized biorefinery...
February 2017: Bioresource Technology
Can Cao, Li Zhang, Jian Gao, Hong Xu, Feng Xue, Weiwei Huang, Yan Li
R,R-2,3-butanediol (R,R-2,3-BD) was produced by Paenibacillus polymyxa ZJ-9, which was capable of utilizing inulin without previous hydrolysis. The Jerusalem artichoke pomace (JAP) derived from the conversion of Jerusalem artichoke powder into inulin extract, which was usually used for biorefinery by submerged fermentation (SMF), was utilized in solid state fermentation (SSF) to produce R,R-2,3-BD. In this study, the fermentation parameters of SSF were optimized and determined in flasks. A novel bioreactor was designed and assembled for the laboratory scale-up of SSF, with a maximum yield of R,R-2,3-BD (67...
December 10, 2016: Applied Biochemistry and Biotechnology
Maria Sotenko, Stuart Coles, Guy Barker, Lijiang Song, Ying Jiang, Philip Longhurst, Tamara Romanova, Olga Shuvaeva, Kerry Kirwan
During the last few decades, phytoremediation process has attracted much attention because of the growing concerns about the deteriorating quality of soil caused by anthropogenic activities. Here, a tandem phytoremediation/biorefinery process was proposed as a way to turn phytoremediation into a viable commercial method by producing valuable chemicals in addition to cleaned soil. Two agricultural plants (Sinapis alba and Helianthus annuus) were grown in moderately contaminated soil with ca. 100 ppm of Ni and further degraded by a fungal lignin degrader - Phanerochaete chrysosporium...
December 12, 2016: International Journal of Phytoremediation
Mi Li, Yunqiao Pu, Arthur J Ragauskas
Lignin, a complex aromatic polymer in terrestrial plants, contributes significantly to biomass recalcitrance to microbial and/or enzymatic deconstruction. To reduce biomass recalcitrance, substantial endeavors have been exerted on pretreatment and lignin engineering in the past few decades. Lignin removal and/or alteration of lignin structure have been shown to result in reduced biomass recalcitrance with improved cell wall digestibility. While high lignin content is usually a barrier to a cost-efficient application of bioresources to biofuels, the direct correlation of lignin structure and its concomitant properties with biomass remains unclear due to the complexity of cell wall and lignin structure...
2016: Frontiers in Chemistry
Hidetaka Doi, Yuriko Tokura, Yukiko Mori, Kenichi Mori, Yoko Asakura, Yoshihiro Usuda, Hiroo Fukuda, Akito Chinen
Alginate is a marine non-food-competing polysaccharide that has potential applications in biorefinery. Owing to its large size (molecular weight >300,000 Da), alginate cannot pass through the bacterial cell membrane. Therefore, bacteria that utilize alginate are presumed to have an enzyme that degrades extracellular alginate. Recently, Vibrio algivorus sp. SA2(T) was identified as a novel alginate-decomposing and alginate-utilizing species. However, little is known about the mechanism of alginate degradation and metabolism in this species...
December 3, 2016: Applied Microbiology and Biotechnology
Birgit Kamm, Sebastian Leiß, Petra Schönicke, Matthias Bierbaum
Wheat straw was pretreated and afterwards enzymatically hydrolyzed using a modified ammonia fiber expansion (AFEX) process under different reaction conditions to produce fermentable sugars. Instead of liquid ammonia, aqueous ammonia (25 % w/v) was used to test its influence on the sugar concentration and yield of the sugars. It is shown that a protein extraction after the pretreatment can distinctly improve the result obtained for the enzymatic hydrolysis. This modified AFEX process using aqueous ammonia represents a simpler and less expensive variant of the AFEX process usually described in literature...
November 29, 2016: ChemSusChem
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