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Tura A, Montipó S, Fontana RC, Dillon AJ, Camassola M. ETHANOL PRODUCTION FROM SUGAR LIBERATED FROM Pinus SP. AND Eucalyptus SP. BIOMASS PRETREATED BY IONIC LIQUIDS. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2018. [DOI: 10.1590/0104-6632.20180352s20160645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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152
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The Influence of Cation Treatments on the Pervaporation Dehydration of NaA Zeolite Membranes Prepared on Hollow Fibers. Processes (Basel) 2018. [DOI: 10.3390/pr6060070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
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153
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Kuwahara M, Nishioka M, Yoshida M, Fujita KI. A Sustainable Method for the Synthesis of Acetic Acid Based on Dehydrogenation of an Ethanol-Water Solution Catalyzed by an Iridium Complex Bearing a Functional Bipyridonate Ligand. ChemCatChem 2018. [DOI: 10.1002/cctc.201800680] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Masato Kuwahara
- Graduate School of Human and Environmental Studies; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
| | - Masaaki Nishioka
- Graduate School of Human and Environmental Studies; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
| | - Masato Yoshida
- Graduate School of Human and Environmental Studies; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
| | - Ken-ichi Fujita
- Graduate School of Human and Environmental Studies; Kyoto University; Sakyo-ku Kyoto 606-8501 Japan
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154
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Shavandi A, Silva TH, Bekhit AA, Bekhit AEDA. Keratin: dissolution, extraction and biomedical application. Biomater Sci 2018; 5:1699-1735. [PMID: 28686242 DOI: 10.1039/c7bm00411g] [Citation(s) in RCA: 172] [Impact Index Per Article: 28.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Keratinous materials such as wool, feathers and hooves are tough unique biological co-products that usually have high sulfur and protein contents. A high cystine content (7-13%) differentiates keratins from other structural proteins, such as collagen and elastin. Dissolution and extraction of keratin is a difficult process compared to other natural polymers, such as chitosan, starch, collagen, and a large-scale use of keratin depends on employing a relatively fast, cost-effective and time efficient extraction method. Keratin has some inherent ability to facilitate cell adhesion, proliferation, and regeneration of the tissue, therefore keratin biomaterials can provide a biocompatible matrix for regrowth and regeneration of the defective tissue. Additionally, due to its amino acid constituents, keratin can be tailored and finely tuned to meet the exact requirement of degradation, drug release or incorporation of different hydrophobic or hydrophilic tails. This review discusses the various methods available for the dissolution and extraction of keratin with emphasis on their advantages and limitations. The impacts of various methods and chemicals used on the structure and the properties of keratin are discussed with the aim of highlighting options available toward commercial keratin production. This review also reports the properties of various keratin-based biomaterials and critically examines how these materials are influenced by the keratin extraction procedure, discussing the features that make them effective as biomedical applications, as well as some of the mechanisms of action and physiological roles of keratin. Particular attention is given to the practical application of keratin biomaterials, namely addressing the advantages and limitations on the use of keratin films, 3D composite scaffolds and keratin hydrogels for tissue engineering, wound healing, hemostatic and controlled drug release.
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Affiliation(s)
- Amin Shavandi
- Center for Materials Science and Technology, University of Otago, Dunedin, New Zealand.
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155
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Cheng HY, Masiello CA, Del Valle I, Gao X, Bennett GN, Silberg JJ. Ratiometric Gas Reporting: A Nondisruptive Approach To Monitor Gene Expression in Soils. ACS Synth Biol 2018; 7:903-911. [PMID: 29366321 DOI: 10.1021/acssynbio.7b00405] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Fluorescent proteins are ubiquitous tools that are used to monitor the dynamic functions of natural and synthetic genetic circuits. However, these visual reporters can only be used in transparent settings, a limitation that complicates nondisruptive measurements of gene expression within many matrices, such as soils and sediments. We describe a new ratiometric gas reporting method for nondisruptively monitoring gene expression within hard-to-image environmental matrices. With this approach, C2H4 is continuously synthesized by ethylene forming enzyme to provide information on viable cell number, and CH3Br is conditionally synthesized by placing a methyl halide transferase gene under the control of a conditional promoter. We show that ratiometric gas reporting enables the creation of Escherichia coli biosensors that report on acylhomoserine lactone (AHL) autoinducers used for quorum sensing by Gram-negative bacteria. Using these biosensors, we find that an agricultural soil decreases the bioavailable concentration of a long-chain AHL up to 100-fold. We also demonstrate that these biosensors can be used in soil to nondisruptively monitor AHLs synthesized by Rhizobium leguminosarum and degraded by Bacillus thuringiensis. Finally, we show that this new reporting approach can be used in Shewanella oneidensis, a bacterium that lives in sediments.
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156
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Islam ZU, Klykov SP, Yu Z, Chang D, Hassan EB, Zhang H. Fermentation of Detoxified Acid-Hydrolyzed Pyrolytic Anhydrosugars into Bioethanol with Saccharomyces cerevisiae 2.399. APPL BIOCHEM MICRO+ 2018. [DOI: 10.1134/s0003683818010143] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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157
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Khan MI, Shin JH, Kim JD. The promising future of microalgae: current status, challenges, and optimization of a sustainable and renewable industry for biofuels, feed, and other products. Microb Cell Fact 2018; 17:36. [PMID: 29506528 PMCID: PMC5836383 DOI: 10.1186/s12934-018-0879-x] [Citation(s) in RCA: 619] [Impact Index Per Article: 103.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 02/17/2018] [Indexed: 12/18/2022] Open
Abstract
Microalgae have recently attracted considerable interest worldwide, due to their extensive application potential in the renewable energy, biopharmaceutical, and nutraceutical industries. Microalgae are renewable, sustainable, and economical sources of biofuels, bioactive medicinal products, and food ingredients. Several microalgae species have been investigated for their potential as value-added products with remarkable pharmacological and biological qualities. As biofuels, they are a perfect substitute to liquid fossil fuels with respect to cost, renewability, and environmental concerns. Microalgae have a significant ability to convert atmospheric CO2 to useful products such as carbohydrates, lipids, and other bioactive metabolites. Although microalgae are feasible sources for bioenergy and biopharmaceuticals in general, some limitations and challenges remain, which must be overcome to upgrade the technology from pilot-phase to industrial level. The most challenging and crucial issues are enhancing microalgae growth rate and product synthesis, dewatering algae culture for biomass production, pretreating biomass, and optimizing the fermentation process in case of algal bioethanol production. The present review describes the advantages of microalgae for the production of biofuels and various bioactive compounds and discusses culturing parameters.
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Affiliation(s)
- Muhammad Imran Khan
- Department of Biotechnology, Chonnam National University, San 96-1, Dun-Duk Dong, Yeosu, Chonnam 550-749 South Korea
| | - Jin Hyuk Shin
- Department of Biotechnology, Chonnam National University, San 96-1, Dun-Duk Dong, Yeosu, Chonnam 550-749 South Korea
| | - Jong Deog Kim
- Department of Biotechnology, Chonnam National University, San 96-1, Dun-Duk Dong, Yeosu, Chonnam 550-749 South Korea
- Research Center on Anti-Obesity and Health Care, Chonnam National University, San 96-1, Dun-Duk Dong, Yeosu, Chonnam 550-749 South Korea
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158
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Sayaslan A, Koyuncu M, Türker S, Irklı Y, Serin A, Orhan FG. Use of durum wheat clear flour in vital gluten and bioethanol production. J Cereal Sci 2018. [DOI: 10.1016/j.jcs.2018.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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159
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Ligaba-Osena A, Jones J, Donkor E, Chandrayan S, Pole F, Wu CH, Vieille C, Adams MWW, Hankoua BB. Novel Bioengineered Cassava Expressing an Archaeal Starch Degradation System and a Bacterial ADP-Glucose Pyrophosphorylase for Starch Self-Digestibility and Yield Increase. FRONTIERS IN PLANT SCIENCE 2018; 9:192. [PMID: 29541080 PMCID: PMC5836596 DOI: 10.3389/fpls.2018.00192] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 02/01/2018] [Indexed: 11/06/2023]
Abstract
To address national and global low-carbon fuel targets, there is great interest in alternative plant species such as cassava (Manihot esculenta), which are high-yielding, resilient, and are easily converted to fuels using the existing technology. In this study the genes encoding hyperthermophilic archaeal starch-hydrolyzing enzymes, α-amylase and amylopullulanase from Pyrococcus furiosus and glucoamylase from Sulfolobus solfataricus, together with the gene encoding a modified ADP-glucose pyrophosphorylase (glgC) from Escherichia coli, were simultaneously expressed in cassava roots to enhance starch accumulation and its subsequent hydrolysis to sugar. A total of 13 multigene expressing transgenic lines were generated and characterized phenotypically and genotypically. Gene expression analysis using quantitative RT-PCR showed that the microbial genes are expressed in the transgenic roots. Multigene-expressing transgenic lines produced up to 60% more storage root yield than the non-transgenic control, likely due to glgC expression. Total protein extracted from the transgenic roots showed up to 10-fold higher starch-degrading activity in vitro than the protein extracted from the non-transgenic control. Interestingly, transgenic tubers released threefold more glucose than the non-transgenic control when incubated at 85°C for 21-h without exogenous application of thermostable enzymes, suggesting that the archaeal enzymes produced in planta maintain their activity and thermostability.
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Affiliation(s)
- Ayalew Ligaba-Osena
- College of Agriculture and Related Sciences, Delaware State University, Dover, DE, United States
| | - Jenna Jones
- College of Agriculture and Related Sciences, Delaware State University, Dover, DE, United States
| | - Emmanuel Donkor
- College of Agriculture and Related Sciences, Delaware State University, Dover, DE, United States
| | - Sanjeev Chandrayan
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, United States
| | - Farris Pole
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, United States
| | - Chang-Hao Wu
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, United States
| | - Claire Vieille
- Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, MI, United States
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI, United States
| | - Michael W. W. Adams
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA, United States
| | - Bertrand B. Hankoua
- College of Agriculture and Related Sciences, Delaware State University, Dover, DE, United States
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160
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Yi Z, Fang Y, He K, Liu D, Luo H, Zhao D, He H, Jin Y, Zhao H. Directly mining a fungal thermostable α-amylase from Chinese Nong-flavor liquor starter. Microb Cell Fact 2018; 17:30. [PMID: 29471820 PMCID: PMC5822527 DOI: 10.1186/s12934-018-0878-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 02/12/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Chinese Nong-flavor (NF) liquor is continuously and stably produced by solid-state fermentation technology for 1000 years, resulting in enrichment of special microbial community and enzymes system in its starter. Based on traditional culture-dependent methods, these functional enzymes are hardly obtained. According to our previous metatranscriptomic analysis, which identifies plenty of thermostable carbohydrate-active enzymes in NF liquor starter, the aim of this study is to provide a direct and efficient way to mine these thermostable enzymes. RESULTS In present study, an alpha-amylase (NFAmy13A) gene, which showed the highest expression level of enzymes in starch degradation at high temperature stage (62 °C), was directly obtained by functional metatranscriptomics from Chinese Nong-flavor liquor starter and expressed in Pichia pastoris. NFAmy13A had a typical signal peptide and shared the highest sequence identity of 64% with α-amylase from Aspergillus niger. The recombinant enzyme of NFAmy13A showed an optimal pH at 5.0-5.5 and optimal temperature at 60 °C. NFAmy13A was activated and stabilized by Ca2+, and its half-lives at 60 and 70 °C were improved significantly from 1.5 and 0.4 h to 16 and 0.7 h, respectively, in the presence of 10 mM CaCl2. Meanwhile, Hg2+, Co2+ and SDS largely inhibited its activity. NFAmy13A showed the maximum activity on amylopectin, followed by various starches, amylose, glycogen, and pullulan, and its specificity activity on amylopectin was 200.4 U/mg. Moreover, this α-amylase efficiently hydrolyzed starches (from corn, wheat, and potato) at high concentrations up to 15 mg/ml. CONCLUSIONS This study provides a direct way to mine active enzymes from man-made environment of NF liquor starter, by which a fungal thermostable α-amylase (NFAmy13A) is successfully obtained. The good characteristics of NFAmy13A in degrading starch at high temperature are consistent with its pivotal role in solid-state fermentation of NF liquor brewing. This work would stimulate mining more enzymes from NF liquor starter and studying their potentially synergistic roles in NF liquor brewing, thus paving the way toward the optimization of liquor production and improvement of liquor quality in future.
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Affiliation(s)
- Zhuolin Yi
- Meat-processing Application Key Laboratory of Sichuan Province, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, China.,Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu, China.,Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Yang Fang
- Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu, China.,Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Kaize He
- Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu, China.,Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China
| | - Dayu Liu
- Meat-processing Application Key Laboratory of Sichuan Province, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, China
| | - Huibo Luo
- Liquor Making Bio-Technology & Application of Key Laboratory of Sichuan Province, Bioengineering College, Sichuan University of Science & Engineering, Zigong, China
| | | | - Hui He
- Department of Liquor Making Engineering, Moutai College, Renhuai, China
| | - Yanling Jin
- Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu, China. .,Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China.
| | - Hai Zhao
- Meat-processing Application Key Laboratory of Sichuan Province, College of Pharmacy and Biological Engineering, Chengdu University, Chengdu, China. .,Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu, China. .,Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, No. 9 Section 4, Renmin Nan Road, Chengdu, 610041, Sichuan, People's Republic of China.
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161
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Physico-Chemical Conversion of Lignocellulose: Inhibitor Effects and Detoxification Strategies: A Mini Review. Molecules 2018; 23:molecules23020309. [PMID: 29389875 PMCID: PMC6017906 DOI: 10.3390/molecules23020309] [Citation(s) in RCA: 157] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/18/2018] [Accepted: 01/30/2018] [Indexed: 11/20/2022] Open
Abstract
A pretreatment of lignocellulosic biomass to produce biofuels, polymers, and other chemicals plays a vital role in the biochemical conversion process toward disrupting the closely associated structures of the cellulose-hemicellulose-lignin molecules. Various pretreatment steps alter the chemical/physical structure of lignocellulosic materials by solubilizing hemicellulose and/or lignin, decreasing the particle sizes of substrate and the crystalline portions of cellulose, and increasing the surface area of biomass. These modifications enhance the hydrolysis of cellulose by increasing accessibilities of acids or enzymes onto the surface of cellulose. However, lignocellulose-derived byproducts, which can inhibit and/or deactivate enzyme and microbial biocatalysts, are formed, including furan derivatives, lignin-derived phenolics, and carboxylic acids. These generation of compounds during pretreatment with inhibitory effects can lead to negative effects on subsequent steps in sugar flat-form processes. A number of physico-chemical pretreatment methods such as steam explosion, ammonia fiber explosion (AFEX), and liquid hot water (LHW) have been suggested and developed for minimizing formation of inhibitory compounds and alleviating their effects on ethanol production processes. This work reviews the physico-chemical pretreatment methods used for various biomass sources, formation of lignocellulose-derived inhibitors, and their contributions to enzymatic hydrolysis and microbial activities. Furthermore, we provide an overview of the current strategies to alleviate inhibitory compounds present in the hydrolysates or slurries.
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162
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Blümmel M, Teymouri F, Moore J, Nielson C, Videto J, Kodukula P, Pothu S, Devulapalli R, Varijakshapanicker P. Ammonia Fiber Expansion (AFEX) as spin off technology from 2nd generation biofuel for upgrading cereal straws and stovers for livestock feed. Anim Feed Sci Technol 2018. [DOI: 10.1016/j.anifeedsci.2017.12.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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163
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Szambelan K, Nowak J, Frankowski J, Szwengiel A, Jeleń H, Burczyk H. The comprehensive analysis of sorghum cultivated in Poland for energy purposes: Separate hydrolysis and fermentation and simultaneous saccharification and fermentation methods and their impact on bioethanol effectiveness and volatile by-products from the grain and the energy potential of sorghum straw. BIORESOURCE TECHNOLOGY 2018; 250:750-757. [PMID: 29223867 DOI: 10.1016/j.biortech.2017.11.096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 11/27/2017] [Accepted: 11/28/2017] [Indexed: 06/07/2023]
Abstract
The aim of this work was to study the potential of sorghum crop cultivated in European climate as an energy material. The investigation showed strong interaction between the fermentation method and the sorghum cultivar. It was also noted that the cultivar with the highest grain yield showed the highest yield of ethanol per hectare, achieving 1269 L/ha in SHF (separate hydrolysis and fermentation) and 1248 L/ha in SSF (simultaneous saccharification and fermentation). Chromatographic analysis of raw spirits showed that smaller amounts of impurities are formed in the SSF process than in the SHF process. The calorific value of sorghum straw was also measured, and amounted to 16,050-16,840 kJ/kg. The results have demonstrated the high value of sorghum as grain for bioethanol production and as straw as a valuable feedstock for forming pellets or briquettes.
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Affiliation(s)
- Katarzyna Szambelan
- Department of Fermentation and Biosynthesis, Institute of Food Technology of Plant Origin, Poznan University of Life Sciences, Wojska Polskiego 31, 60-624 Poznan, Poland.
| | - Jacek Nowak
- Department of Fermentation and Biosynthesis, Institute of Food Technology of Plant Origin, Poznan University of Life Sciences, Wojska Polskiego 31, 60-624 Poznan, Poland
| | - Jakub Frankowski
- Department of Breeding and Agricultural Technology for Fibrous and Energy Plants, Institute of Natural Fibres and Medicinal Plants, Wojska Polskiego 71b, 60-630 Poznan, Poland
| | - Artur Szwengiel
- Department of Fermentation and Biosynthesis, Institute of Food Technology of Plant Origin, Poznan University of Life Sciences, Wojska Polskiego 31, 60-624 Poznan, Poland
| | - Henryk Jeleń
- Department of Fermentation and Biosynthesis, Institute of Food Technology of Plant Origin, Poznan University of Life Sciences, Wojska Polskiego 31, 60-624 Poznan, Poland
| | - Henryk Burczyk
- Department of Breeding and Agricultural Technology for Fibrous and Energy Plants, Institute of Natural Fibres and Medicinal Plants, Wojska Polskiego 71b, 60-630 Poznan, Poland
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164
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Muharja M, Junianti F, Ranggina D, Nurtono T, Widjaja A. An integrated green process: Subcritical water, enzymatic hydrolysis, and fermentation, for biohydrogen production from coconut husk. BIORESOURCE TECHNOLOGY 2018; 249:268-275. [PMID: 29054055 DOI: 10.1016/j.biortech.2017.10.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 10/05/2017] [Accepted: 10/06/2017] [Indexed: 06/07/2023]
Abstract
The objective of this work is to develop an integrated green process of subcritical water (SCW), enzymatic hydrolysis and fermentation of coconut husk (CCH) to biohydrogen. The maximum sugar yield was obtained at mild severity factor. This was confirmed by the degradation of hemicellulose, cellulose and lignin. The tendency of the changing of sugar yield as a result of increasing severity factor was opposite to the tendency of pH change. It was found that CO2 gave a different tendency of severity factor compared to N2 as the pressurizing gas. The result of SEM analysis confirmed the structural changes during SCW pretreatment. This study integrated three steps all of which are green processes which ensured an environmentally friendly process to produce a clean biohydrogen.
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Affiliation(s)
- Maktum Muharja
- Department of Chemical Engineering - Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Fitri Junianti
- Department of Chemical Engineering - Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Dian Ranggina
- Department of Chemical Engineering - Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Tantular Nurtono
- Department of Chemical Engineering - Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
| | - Arief Widjaja
- Department of Chemical Engineering - Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia.
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165
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Spertino S, Boatti L, Icardi S, Manfredi M, Cattaneo C, Marengo E, Cavaletto M. Cellulomonas fimi secretomes: In vivo and in silico approaches for the lignocellulose bioconversion. J Biotechnol 2018; 270:21-29. [PMID: 29409863 DOI: 10.1016/j.jbiotec.2018.01.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 12/30/2017] [Accepted: 01/26/2018] [Indexed: 12/17/2022]
Abstract
Lignocellulose degradation is a challenging step for value added products and biofuels production. Cellulomonas fimi secretes complex mixtures of carbohydrate active enzymes (CAZymes) which synergistically degrade cellulose and hemicelluloses. Their characterization may provide new insights for enzymatic cocktails implementation. Bioinformatic analysis highlighted 1127 secreted proteins, constituting the in silico secretome, graphically represented in a 2DE map. According to Blast2GO functional annotation, many of these are involved in carbohydrates metabolism. In vivo secretomes were obtained, growing C. fimi on glucose, CMC or wheat straw for 24 h. Zymography revealed degradative activity on carbohydrates and proteomic analysis identified some CAZymes, only in secretomes obtained with CMC and wheat straw. An interaction between cellobiohydrolases is proposed as a strategy adopted by soluble multimodular cellulases. Such approach can be crucial for a better characterization and industrial exploitation of the synergism among C. fimi enzymes.
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Affiliation(s)
- Stefano Spertino
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy.
| | - Lara Boatti
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy
| | - Sara Icardi
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy
| | - Marcello Manfredi
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy; ISALIT S.r.l., Novara, Italy
| | - Chiara Cattaneo
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy
| | - Emilio Marengo
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy
| | - Maria Cavaletto
- Department of Scienze e Innovazione Tecnologica, University of Piemonte Orientale, Alessandria, Italy
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166
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Winarto, Takaiwa D, Yamamoto E, Yasuoka K. Separation of water-ethanol solutions with carbon nanotubes and electric fields. Phys Chem Chem Phys 2018; 18:33310-33319. [PMID: 27897278 DOI: 10.1039/c6cp06731j] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bioethanol has been used as an alternative energy source for transportation vehicles to reduce the use of fossil fuels. The separation of water-ethanol solutions from fermentation processes is still an important issue in the production of anhydrous ethanol. Using molecular dynamics simulations, we investigate the effect of axial electric fields on the separation of water-ethanol solutions with carbon nanotubes (CNTs). In the absence of an electric field, CNT-ethanol van der Waals interactions allow ethanol to fill the CNTs in preference to water, i.e., a separation effect for ethanol. However, as the CNT diameter increases, this ethanol separation effect significantly decreases owing to a decrease in the strength of the van der Waals interactions. In contrast, under an electric field, the energy of the electrostatic interactions within the water molecule structure induces water molecules to fill the CNTs in preference to ethanol, i.e., a separation effect for water. More importantly, the electrostatic interactions are dependent on the water molecule structure in the CNT instead of the CNT diameter. As a result, the separation effect observed under an electric field does not diminish over a wide CNT diameter range. Moreover, CNTs and electric fields can be used to separate methanol-ethanol solutions too. Under an electric field, methanol preferentially fills CNTs over ethanol in a wide CNT diameter range.
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Affiliation(s)
- Winarto
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. and Department of Mechanical Engineering, Faculty of Engineering, Brawijaya University, Jl. MT Haryono 167, Malang 65145, Indonesia
| | - Daisuke Takaiwa
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Eiji Yamamoto
- Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kenji Yasuoka
- Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
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167
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Schückel J, Kračun SK. Two-Dimensional High-Throughput Endo-Enzyme Screening Assays Based on Chromogenic Polysaccharide Hydrogel and Complex Biomass Substrates. Methods Mol Biol 2018; 1796:201-217. [PMID: 29856056 DOI: 10.1007/978-1-4939-7877-9_15] [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] [Indexed: 06/08/2023]
Abstract
In this chapter, we present a two-dimensional approach for high-throughput screening of endo-cellulases as well as other endo-acting enzymes. The method is based on chromogenic substrates, produced either from purified or complex material, providing valuable information about enzyme activity toward its target as well as that same target in a context of complex natural material normally encountered in bioindustrial settings. The enzymes that can be tested using this assay can be from virtually any source: in purified form, directly from microbial cultures or even from raw materials, enabling study of the interplay between enzyme mixtures such as synergistic or inhibitory effects. By using the method of analysis described in this chapter, enzymes can be screened and evaluated quickly and information pertinent to both the inherent properties of the enzyme itself as well as predictions about its performance on complex biomass samples can be obtained.
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168
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Borthakur MP, Bandyopadhyay D, Biswas G. Electric field mediated separation of water–ethanol mixtures in carbon-nanotubes integrated in nanoporous graphene membranes. Faraday Discuss 2018; 209:259-271. [DOI: 10.1039/c8fd00027a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The tunable separation of water–ethanol mixtures inside CNTs by varying the electric field orientation angle θ.
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Affiliation(s)
| | - Dipankar Bandyopadhyay
- Department of Chemical Engineering
- Indian Institute of Technology Guwahati
- India
- Centre for Nanotechnology
- Indian Institute of Technology Guwahati
| | - Gautam Biswas
- Department of Mechanical Engineering
- Indian Institute of Technology Guwahati
- India
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169
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Santos ELI, Rostro-Alanís M, Parra-Saldívar R, Alvarez AJ. A novel method for bioethanol production using immobilized yeast cells in calcium-alginate films and hybrid composite pervaporation membrane. BIORESOURCE TECHNOLOGY 2018; 247:165-173. [PMID: 28950123 DOI: 10.1016/j.biortech.2017.09.091] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 05/12/2023]
Abstract
Fermentation of sugar for production of ethanol was carried out using Saccharomyces cerevisiae cells immobilized in calcium alginate films. Thin films of calcium alginate casted on a microchannel surface were used instead of the typical spherical bead configuration. Yeast immobilized on alginate films produced a higher ethanol yield than free yeast cells under the same fermentation conditions. Also, a silicalite-1/poly dimethyl siloxane composite pervaporation membrane was synthesized for ethanol separation, and characterized with flux and separation factor. The composite membrane synthesized with a 3-1 ratio of silicalite-1 to poly dimethyl siloxane showed promising results, with a flux of 140.6g/m2h±19.3 and a separation factor of 37.52±3.55. Thus, the performance of both the alginate film with immobilized cells and the customized hybrid membrane suggests they could have an interesting potential application in an integrated reaction-separation device for the production and purification of bioethanol.
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Affiliation(s)
- Eduardo Leal Isla Santos
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico
| | - Magdalena Rostro-Alanís
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico
| | - Roberto Parra-Saldívar
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico
| | - Alejandro J Alvarez
- Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2501, Monterrey, N.L. 64849, Mexico.
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170
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Althuri A, Chintagunta AD, Sherpa KC, Banerjee R. Simultaneous Saccharification and Fermentation of Lignocellulosic Biomass. BIOFUEL AND BIOREFINERY TECHNOLOGIES 2018. [DOI: 10.1007/978-3-319-67678-4_12] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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171
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Ekefre DE, Mahapatra AK, Latimore M, Bellmer DD, Jena U, Whitehead GJ, Williams AL. Evaluation of three cultivars of sweet sorghum as feedstocks for ethanol production in the Southeast United States. Heliyon 2017; 3:e00490. [PMID: 29387821 PMCID: PMC5772367 DOI: 10.1016/j.heliyon.2017.e00490] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/15/2017] [Accepted: 12/12/2017] [Indexed: 10/29/2022] Open
Abstract
Sweet sorghum has become a promising alternative feedstock for biofuel production because it can be grown under reduced inputs, responds to stress more efficiently than traditional crops, and has large biomass production potential. A three-year field study was conducted to evaluate three cultivars of sweet sorghum as bioenergy crops in the Southeast United States (Fort Valley, Georgia): Dale, M81 E and Theis. Parameters evaluated were: plant density, stalk height, and diameter, number of nodes, biomass yield, juice yield, °Bx, sugar production, and theoretical ethanol yields. Yields were measured at 85, 99, and 113 days after planting. Plant fresh weight was the highest for Theis (1096 g) and the lowest for Dale (896 g). M81 E reported the highest stalk dry weight (27 Mg ha-1) and Theis reported the lowest (21 Mg ha-1). Theis ranked the highest °Bx (14.9), whereas M81 E was the lowest (13.2). Juice yield was the greatest for M81 E (10915 L ha-1) and the lowest for Dale (6724 L ha-1). Theoretical conservative sugar yield was the greatest for Theis (13 Mg ha-1) and the lowest for Dale (9 Mg ha-1). Theoretical ethanol yield was the greatest for Theis (7619 L ha-1) and the lowest for Dale (5077 L ha-1).
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Affiliation(s)
- Daniel E Ekefre
- Food Engineering Laboratory, College of Agriculture, Family Sciences and Technology, Fort Valley State University, 1005 State University Drive, Fort Valley, GA 31030, USA
| | - Ajit K Mahapatra
- Food Engineering Laboratory, College of Agriculture, Family Sciences and Technology, Fort Valley State University, 1005 State University Drive, Fort Valley, GA 31030, USA
| | - Mark Latimore
- Food Engineering Laboratory, College of Agriculture, Family Sciences and Technology, Fort Valley State University, 1005 State University Drive, Fort Valley, GA 31030, USA
| | - Danielle D Bellmer
- 108 Food and Agricultural Products Center, Oklahoma State University, Stillwater, OK 74078, USA
| | - Umakanta Jena
- Chemical and Materials Engineering, New Mexico State University, 1780 E University Ave., Las Cruces, NM 88003, USA
| | - Gerald J Whitehead
- Food Engineering Laboratory, College of Agriculture, Family Sciences and Technology, Fort Valley State University, 1005 State University Drive, Fort Valley, GA 31030, USA
| | - Archie L Williams
- Food Engineering Laboratory, College of Agriculture, Family Sciences and Technology, Fort Valley State University, 1005 State University Drive, Fort Valley, GA 31030, USA
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172
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Randová A, Vopička O, Bartovská L, Friess K. Cyclopentyl methyl ether, tert-amyl methyl ether and tert-butyl methyl ether: density, dynamic viscosity, surface tension and refractive index. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-017-0338-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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173
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Santini TC, Peng YG. Microbial Fermentation of Organic Carbon Substrates Drives Rapid pH Neutralization and Element Removal in Bauxite Residue Leachate. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:12592-12601. [PMID: 29027790 DOI: 10.1021/acs.est.7b02844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Globally, mineral processing activities produce an estimated 680 GL/yr of alkaline wastewater. Neutralizing pH and removing dissolved elements are the main goals of wastewater treatment prior to discharge. Here, we present the first study to explicitly evaluate the role of microbial communities in driving pH neutralization and element removal in alkaline wastewaters by fermentation of organic carbon, using bauxite residue leachate as a model system, and evaluate the effects of organic carbon complexity and microbial inoculum addition rates on the performance of these treatment systems at laboratory scale. Rates and extents of pH neutralization were higher in bioreactors fed with simpler organic carbon substrates (glucose and banana: 6 days to reach pH ≤ 8) than those fed with more complex organic carbon substrates (eucalyptus mulch: 15 days to reach pH ≤ 8; woodchips: equilibrium pH around 9). Concentrations of dissolved Al, As, B, Mo, Na, S, and V all significantly decreased after bioremediation. Increasing soil inoculant addition rate accelerated rates and extent of pH neutralization and element removal up to 0.1 wt %; further increases had little effect. Overall, glucose added at 1.8 wt % and soil inoculum added at 0.1 wt % provided the most effective minimal combination of carbon substrate and inoculum to drive pH neutralization and element removal.
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Affiliation(s)
- Talitha C Santini
- School of Earth and Environmental Sciences, The University of Queensland , Brisbane, Queensland 4072, Australia
- School of Agriculture and Environment, The University of Western Australia , Crawley, Western Australia 6009, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland , Brisbane, Queensland 4072, Australia
| | - Yong G Peng
- School of Chemistry and Molecular Biosciences, The University of Queensland , Brisbane, Queensland 4072, Australia
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174
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Nguyen QA, Cho E, Trinh LTP, Jeong JS, Bae HJ. Development of an integrated process to produce d-mannose and bioethanol from coffee residue waste. BIORESOURCE TECHNOLOGY 2017; 244:1039-1048. [PMID: 28851158 DOI: 10.1016/j.biortech.2017.07.169] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 07/26/2017] [Accepted: 07/27/2017] [Indexed: 06/07/2023]
Abstract
A novel, integrated process for economical high-yield production of d-mannose and ethanol from coffee residue waste (CRW), which is abundant and widely available, was reported. The process involves pretreatment, enzymatic hydrolysis, fermentation, color removal, and pervaporation, which can be performed using environmentally friendly technologies. The CRW was pretreated with ethanol at high temperature and then hydrolyzed with enzymes produced in-house to yield sugars. Key points of the process are: manipulations of the fermentation step that allowing bioethanol-producing yeasts to use almost glucose and galactose to produce ethanol, while retaining large amounts of d-mannose in the fermented broth; removal of colored compounds and other components from the fermented broth; and separation of ethanol and d-mannose through pervaporation. Under optimized conditions, approximately 15.7g dry weight (DW) of d-mannose (approximately 46% of the mannose) and approximately 11.3g DW of ethanol from 150g DW of ethanol-pretreated CRW, were recovered.
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Affiliation(s)
- Quynh Anh Nguyen
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Eunjin Cho
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Ly Thi Phi Trinh
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Ji-Su Jeong
- Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea
| | - Hyeun-Jong Bae
- Bio-energy Research Center, Chonnam National University, Gwangju 500-757, Republic of Korea; Department of Bioenergy Science and Technology, Chonnam National University, Gwangju 500-757, Republic of Korea.
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175
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Bazoti SF, Golunski S, Pereira Siqueira D, Scapini T, Barrilli ÉT, Alex Mayer D, Barros KO, Rosa CA, Stambuk BU, Alves SL, Valério A, de Oliveira D, Treichel H. Second-generation ethanol from non-detoxified sugarcane hydrolysate by a rotting wood isolated yeast strain. BIORESOURCE TECHNOLOGY 2017; 244:582-587. [PMID: 28803109 DOI: 10.1016/j.biortech.2017.08.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2017] [Revised: 08/02/2017] [Accepted: 08/03/2017] [Indexed: 06/07/2023]
Abstract
This work aims to evaluate the production of second-generation ethanol from sugarcane bagasse hydrolysate without acetic acid (inhibitor) detoxification. Three isolated yeast strains from lignocellulosic materials were evaluated, and one strain (UFFS-CE-3.1.2), identified using large subunit rDNA sequences as Wickerhamomyces sp., showed satisfactory results in terms of ethanol production without acetic acid removal. A Plackett-Burman design was used to evaluate the influence of hydrolysate composition and nutrients supplementation in the fermentation medium for the second-generation ethanol production. Two fermentation kinetics were performed, with controlled pH at 5.5, or keeping the initial pH at 4.88. The fermentation conducted without pH adjustment and supplementation of nutrients reported the best result in terms of second-generation ethanol production. Wickerhamomyces sp., isolated as UFFS-CE-3.1.2, was considered promising in the production of second-generation ethanol by using crude (non-detoxified) sugarcane hydrolysate.
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Affiliation(s)
- Suzana F Bazoti
- Federal University of Santa Catarina, Department of Chemical and Food Engineering, Brazil; Federal University of Fronteira Sul - Campus Erechim - RS, Laboratory of Microbiology and Bioprocesses, Brazil
| | - Simone Golunski
- Federal University of Fronteira Sul - Campus Erechim - RS, Laboratory of Microbiology and Bioprocesses, Brazil
| | - Diego Pereira Siqueira
- Federal University of Fronteira Sul - Campus Erechim - RS, Laboratory of Microbiology and Bioprocesses, Brazil
| | - Thamarys Scapini
- Federal University of Fronteira Sul - Campus Erechim - RS, Laboratory of Microbiology and Bioprocesses, Brazil
| | - Évelyn T Barrilli
- Federal University of Fronteira Sul - Campus Chapecó - SC, Research Group of Enzymatic and Microbiological Processes, Brazil
| | - Diego Alex Mayer
- Federal University of Santa Catarina, Department of Chemical and Food Engineering, Brazil
| | | | - Carlos A Rosa
- Federal University of Minas Gerais, Department of Microbiology, Brazil
| | - Boris U Stambuk
- Federal University of Santa Catarina, Department of Biochemistry, Brazil
| | - Sérgio L Alves
- Federal University of Fronteira Sul - Campus Chapecó - SC, Research Group of Enzymatic and Microbiological Processes, Brazil
| | - Alexsandra Valério
- Federal University of Santa Catarina, Department of Chemical and Food Engineering, Brazil
| | - Débora de Oliveira
- Federal University of Santa Catarina, Department of Chemical and Food Engineering, Brazil
| | - Helen Treichel
- Federal University of Fronteira Sul - Campus Erechim - RS, Laboratory of Microbiology and Bioprocesses, Brazil.
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176
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Peña-Serna C, Castro-Gil C, Peláez-Jaramillo CA. Evaluación de la producción de Etanol por dos cepas recombinantes y una comercial de <i>Saccharomyces cerevisae</i> (Fungi: Ascomycota) en melaza de caña de azúcar de y mostos de banano de rechazo de Urabá, Colombia. ACTUALIDADES BIOLÓGICAS 2017. [DOI: 10.17533/udea.acbi.329228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
La producción de bioetanol a partir de Saccharomyces cerevisiae (Fungi: Ascomycota) está influenciada por la concentración de azúcares y el sustrato de fermentación. Por ello, en este trabajo se evaluaron las cinéticas de producción de biomasa, azúcares residuales y producción de etanol de cuatro cepas de S. cerevisiae en dos medios de fermentación (melaza de caña de azúcar y banano de rechazo) a dos concentraciones de azúcares (100 y 170 g/l). Las cepas Ethanol Red® y GG570-CIBII presentaron mayor producción de etanol con pico de producción de 119,74 (35 h) y 62 g/l (15 h), Yps 0,75 y 0,43 g/g y Qp 3,42 y 2,61 g/l/h, respectivamente a 170 g/l de azúcares en melaza de caña de azúcar. Adicionalmente, la cepa GG570-CIBII mostró un incremento de 37,1 g/l de etanol con respecto a la cepa control.
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177
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Comparison of One-Stage Batch and Fed-Batch Enzymatic Hydrolysis of Pretreated Hardwood for the Production of Biosugar. Appl Biochem Biotechnol 2017; 184:1441-1452. [PMID: 29064030 DOI: 10.1007/s12010-017-2633-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 10/13/2017] [Indexed: 10/18/2022]
Abstract
Fed-batch method has shown a great promise in debottlenecking the high-solid enzymatic hydrolysis for the commercialization of cellulosic biosugar conversion for biofuel/biochemical production. To further improve enzymatic hydrolysis efficiency at high solid loading, fed-batch methods of green liquor-pretreated hardwood were performed to evaluate their effects on sugar recovery by comparing with one-stage batch method in this study. Among all the explored conditions, the fed-batch at 15% consistency gave higher sugar recovery on green liquor-pretreated hardwood compared to that of one-stage batch. By using general linear model analysis, the percentage of enzymatic sugar recovery in fed-batch consistency method (increasing consistency from the initial 10.7 to 15% at intervals of 24 and 48 h) was higher than that of batch hydrolysis at higher density of 15% consistency. Under that best fed-batch condition, the total sugar recovery of pretreated hardwood in enzymatic hydrolysate reached approximately 48.41% at Cellic® enzyme loading of 5 filter-paper unit (FPU)/g and 58.83% at Cellic® enzyme loading of 10 FPU/g with a hydrolysis time of 96 h.
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178
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Peña-Serna C, Castro-Gil C, Peláez-Jaramillo CA. Evaluación de la producción de etanol por dos cepas recombinantes y una comercial de <i>Saccharomyces cerevisiae</i> (Fungi: Ascomycota) en melaza de caña de azúcar y mostos de banano de rechazo de Urabá (Antioquia), Colombia. ACTUALIDADES BIOLÓGICAS 2017. [DOI: 10.17533/udea.acbi.14239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
La producción de bioetanol a partir de Saccharomyces cerevisiae (Fungi: Ascomycota) está influenciada por la concentración de azúcares y el sustrato de fermentación. Por ello en este trabajo se evaluaron las cinéticas de producción de biomasa, azúcares residuales y producción de etanol de cuatro cepas de S. cerevisiae en dos medios de fermentación (melaza de caña de azúcar y banano de rechazo) a dos concentraciones de azúcares (100 y 170 g/l). Las cepas EthanolRed® y GG570-CIBII presentaron mayor producción de etanol con pico de producción de 119,74 (35 h) y 62 g/l (15 h), Yps 0,75 y 0,43 g/g y, Qp 3,42 y 2,61 g/l/h, respectivamente a 170 g/l de azúcares en melaza de caña de azúcar. Adicionalmente, la cepa GG570-CIBII mostró un incremento de 37,1 g/l de etanol con respecto a la cepa control.
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179
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Microalgae biorefineries: The Brazilian scenario in perspective. N Biotechnol 2017; 39:90-98. [DOI: 10.1016/j.nbt.2016.04.007] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 04/04/2016] [Accepted: 04/07/2016] [Indexed: 11/19/2022]
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180
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Lutosławski K, Cibis E, Krzywonos M. The effect of temperature on the efficiency of aerobic biodegradation of sugar beet distillery stillage: Removal of pollution load and biogens. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2017. [DOI: 10.1590/0104-6632.20170344s20160417] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
| | - E. Cibis
- Wrocław University of Economics, Poland
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181
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Xian L, Feng JX. Purification and biochemical characterization of a novel mesophilic glucoamylase from Aspergillus tritici WZ99. Int J Biol Macromol 2017; 107:1122-1130. [PMID: 28951303 DOI: 10.1016/j.ijbiomac.2017.09.095] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 09/20/2017] [Accepted: 09/22/2017] [Indexed: 11/17/2022]
Abstract
Glucoamylase, cleaving the nonreducing end of starch releasing glucose, is an important enzyme in starch processing. The optimal temperature for industrial glucoamylase activity is 60-70°C, which is not compatible with the optimal growth temperature for Saccharomyces cerevisiae. In this study, 26 fungal strains producing amylolytic activities that were more active at 30°C than at 60°C were isolated from 151 environmental samples. Fungal strain WZ99, producing extracellular amylolytic activities with the lowest optimal temperature at 40°C, was identified as Aspergillus tritici by analysis of morphological and molecular data. An extracellular glucoamylase was purified from A. tritici WZ99. The optimal pH of the enzyme was 4.0-5.0 and optimal temperature was 45°C. The glucoamylase was stable at pH 4.5-10.0 and below 40°C. Metal ions at four concentrations did not inhibit the enzyme activity. The glucoamylase contained a catalytic domain belonging to glycosyl hydrolase family 15 and thus was named as AtriGA15A. The enzyme shared the highest identity of 54% with a glucoamylase from Rasamsonia emersonii. This glucoamylase showing excellent comprehensive enzymatic characteristics might have potential applications in starch-based bioethanol production and starch processing.
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Affiliation(s)
- Liang Xian
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning 530004, China
| | - Jia-Xun Feng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning 530004, China.
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182
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Li Y, Cao X, Geng Z, Zhang M. A novel quasi plug-flow reactor design for enzymatic hydrolysis of cellulose using rheology experiment and CFD simulation. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.22963] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yonghui Li
- Key Laboratory for Green Chemical Technology of Ministry of Education, Research and Development Center of Petrochemical Technology; Tianjin University; Tianjin P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin P. R. China
| | - Xingxing Cao
- Key Laboratory for Green Chemical Technology of Ministry of Education, Research and Development Center of Petrochemical Technology; Tianjin University; Tianjin P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin P. R. China
| | - Zhongfeng Geng
- Key Laboratory for Green Chemical Technology of Ministry of Education, Research and Development Center of Petrochemical Technology; Tianjin University; Tianjin P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin P. R. China
| | - Minhua Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, Research and Development Center of Petrochemical Technology; Tianjin University; Tianjin P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin P. R. China
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183
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Soares IB, Mendes KCS, Benachour M, Abreu CAM. Evaluation of the effects of operational parameters in the pretreatment of sugarcane bagasse with diluted sulfuric acid using analysis of variance. CHEM ENG COMMUN 2017. [DOI: 10.1080/00986445.2017.1365061] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- I. B. Soares
- Department of Chemical Engineering, Universidade Federal de Pernambuco–UFPE, Recife, PE, Brazil
| | - K. C. S. Mendes
- Department of Chemical Engineering, Universidade Federal de Pernambuco–UFPE, Recife, PE, Brazil
| | - M. Benachour
- Department of Chemical Engineering, Universidade Federal de Pernambuco–UFPE, Recife, PE, Brazil
| | - C. A. M. Abreu
- Department of Chemical Engineering, Universidade Federal de Pernambuco–UFPE, Recife, PE, Brazil
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184
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Isolation and Identification of Cellulolytic and Ethanologenic Bacteria from Soil. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY, TRANSACTIONS A: SCIENCE 2017. [DOI: 10.1007/s40995-017-0282-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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185
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Carbon chain length of biofuel- and flavor-relevant volatile organic compounds produced by lignocellulolytic fungal endophytes changes with culture temperature. MYCOSCIENCE 2017. [DOI: 10.1016/j.myc.2017.03.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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186
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Han Z, Chen F, Zhong C, Zhou J, Wu X, Yong X, Zhou H, Jiang M, Jia H, Wei P. Effects of different carriers on biogas production and microbial community structure during anaerobic digestion of cassava ethanol wastewater. ENVIRONMENTAL TECHNOLOGY 2017; 38:2253-2262. [PMID: 27804789 DOI: 10.1080/09593330.2016.1255666] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Accepted: 10/27/2016] [Indexed: 06/06/2023]
Abstract
In this study, an anaerobic bioreactor (AB) with no added fillers (ABWF), a packed-bed bioreactor with a porous ceramic filler (ABCF), and another packed-bed bioreactor filled with graphite felt (ABGF) were established for anaerobic digestion of cassava ethanol wastewater. The results showed that ABCF exhibited excellent wastewater treatment performance in a stable process that was superior to ABWF and ABGF, with the following characteristics: a high chemical oxygen demand removal efficiency of 98.06% and maximum biogas production of 3200 mL/d at a total reactor volume of 3.46 L. Illumina MiSeq sequencing analysis revealed that differences existed among the microbial communities of the three ABs that were in accordance with the operational characteristics. The ABCF system displayed maximum bacterial diversity, whereas the ABWF system exhibited moderate richness and the ABGF system possessed the lowest species richness. The ABCF system was more stable than the ABWF and ABGF systems during anaerobic digestion of cassava ethanol wastewater. Different functional microbial communities that are responsible for the degradation of certain compounds were also identified in the ABCF and ABGF systems. Our results demonstrate that ceramic materials should be considered an appropriate support for the immobilization of cells.
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Affiliation(s)
- Zhou Han
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Feier Chen
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Chao Zhong
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Jun Zhou
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Xiayuan Wu
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Xiaoyu Yong
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Hua Zhou
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
| | - Min Jiang
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
| | - Honghua Jia
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
- b Bioenergy Research Institute , Nanjing Tech University , Nanjing , People's Republic of China
| | - Ping Wei
- a College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing , People's Republic of China
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187
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Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review. SUSTAINABILITY 2017. [DOI: 10.3390/su9081492] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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188
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Wickramasinghe GHIM, Rathnayake PPAMSI, Chandrasekharan NV, Weerasinghe MSS, Wijesundera RLC, Wijesundera WSS. Expression, Docking, and Molecular Dynamics of Endo- β-1,4-xylanase I Gene of Trichoderma virens in Pichia stipitis. BIOMED RESEARCH INTERNATIONAL 2017; 2017:4658584. [PMID: 28856159 PMCID: PMC5569632 DOI: 10.1155/2017/4658584] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 06/19/2017] [Indexed: 11/18/2022]
Abstract
It is essential that major carbohydrate polymers in the lignocellulosic biomass are converted into fermentable sugars for the economical production of energy. Xylan, the major component of hemicelluloses, is the second most naturally abundant carbohydrate polymer comprising 20-40% of the total biomass. Endoxylanase (EXN) hydrolyzes xylan into mixtures of xylooligosaccharides. The objective of this study was to genetically modify Pichia stipitis, a pentose sugar fermenting yeast species, to hydrolyze xylan into xylooligosaccharides via cloning and heterologous extracellular expression of EXNI gene from locally isolated Trichoderma virens species. Pichia stipitis was engineered to carry the EXNI gene of T. virens using pGAPZα expression vector. The open reading frame encodes 191 amino acids and SDS-PAGE analysis revealed a 24 kDA recombinant protein. The EXNI activity expressed by recombinant P. stipitis clone under standard conditions using 1% beechwood xylan was 31.7 U/ml. Molecular docking and molecular dynamics simulations were performed to investigate EXNI-xylan interactions. Free EXNI and xylan bound EXNI exhibited similar stabilities and structural behavior in aqueous medium. Furthermore, this in silico work opens avenues for the development of newer generation EXN proteins that can perform better and have enhanced catalytic activity.
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189
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Aranda-Martinez A, Naranjo Ortiz MÁ, Abihssira García IS, Zavala-Gonzalez EA, Lopez-Llorca LV. Ethanol production from chitosan by the nematophagous fungus Pochonia chlamydosporia and the entomopathogenic fungi Metarhizium anisopliae and Beauveria bassiana. Microbiol Res 2017; 204:30-39. [PMID: 28870289 DOI: 10.1016/j.micres.2017.07.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 06/14/2017] [Accepted: 07/21/2017] [Indexed: 01/08/2023]
Abstract
Chitin is the second most abundant biopolymer after cellulose and virtually unexplored as raw material for bioethanol production. In this paper, we investigate chitosan, the deacetylated form of chitin which is the main component of shellfish waste, as substrate for bioethanol production by fungi. Fungal parasites of invertebrates such as the nematophagous Pochonia chlamydosporia (Pc) or the entomopathogens Beauveria bassiana (Bb) and Metarhizium anisopliae (Ma) are biocontrol agents of plant parasitic nematodes (eg. Meloidogyne spp.) or insect pests such as the red palm weevil (Rhynchophorus ferrugineus). These fungi degrade chitin-rich barriers for host penetration. We have therefore tested the chitin/chitosanolytic capabilities of Pc, Bb and Ma for generating reducing sugars using chitosan as only nutrient. Among the microorganisms used in this study, Pc is the best chitosan degrader, even under anaerobic conditions. These fungi have alcohol dehydrogenase (ADH) and pyruvate decarboxylase (PDC) encoding genes in their genomes. We have therefore analyzed their ethanol production under anaerobic conditions using chitosan as raw material. P. chlamydosporia is the largest ethanol producer from chitosan. Our studies are a starting point to develop chitin-chitosan based biofuels.
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Affiliation(s)
- Almudena Aranda-Martinez
- Laboratory of Plant Pathology, Department of Marine Sciences and Applied Biology, Multidisciplinary Institute for Environmental Studies Ramón Margalef, University of Alicante, Alicante, Spain.
| | | | - Isabel Sofía Abihssira García
- Laboratory of Plant Pathology, Department of Marine Sciences and Applied Biology, Multidisciplinary Institute for Environmental Studies Ramón Margalef, University of Alicante, Alicante, Spain.
| | - Ernesto A Zavala-Gonzalez
- Laboratory of Plant Pathology, Department of Marine Sciences and Applied Biology, Multidisciplinary Institute for Environmental Studies Ramón Margalef, University of Alicante, Alicante, Spain.
| | - Luis Vicente Lopez-Llorca
- Laboratory of Plant Pathology, Department of Marine Sciences and Applied Biology, Multidisciplinary Institute for Environmental Studies Ramón Margalef, University of Alicante, Alicante, Spain.
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190
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Soleimani SS, Adiguzel A, Nadaroglu H. Production of bioethanol by facultative anaerobic bacteria. JOURNAL OF THE INSTITUTE OF BREWING 2017. [DOI: 10.1002/jib.437] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Seyedeh Sara Soleimani
- Faculty of Engineering, Department of Nano-Science and Nano-Engineering; Ataturk University; 25240 Erzurum Turkey
| | - Ahmet Adiguzel
- Department of Molecular Biology and Genetic, Faculty of Science; Ataturk University; 25240 Erzurum Turkey
| | - Hayrunnisa Nadaroglu
- Faculty of Engineering, Department of Nano-Science and Nano-Engineering; Ataturk University; 25240 Erzurum Turkey
- Erzurum Vocational Training School, Department of Food Technology; Ataturk University; 25240 Erzurum Turkey
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191
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Quantitative and visual analysis of enzymatic lignocellulose degradation. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2017. [DOI: 10.1016/j.bcab.2017.06.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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192
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Li X, Zheng Y. Lignin-enzyme interaction: Mechanism, mitigation approach, modeling, and research prospects. Biotechnol Adv 2017; 35:466-489. [DOI: 10.1016/j.biotechadv.2017.03.010] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 02/19/2017] [Accepted: 03/23/2017] [Indexed: 01/23/2023]
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193
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Mohd Azhar SH, Abdulla R, Jambo SA, Marbawi H, Gansau JA, Mohd Faik AA, Rodrigues KF. Yeasts in sustainable bioethanol production: A review. Biochem Biophys Rep 2017; 10:52-61. [PMID: 29114570 PMCID: PMC5637245 DOI: 10.1016/j.bbrep.2017.03.003] [Citation(s) in RCA: 173] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 02/10/2017] [Accepted: 03/04/2017] [Indexed: 12/23/2022] Open
Abstract
Bioethanol has been identified as the mostly used biofuel worldwide since it significantly contributes to the reduction of crude oil consumption and environmental pollution. It can be produced from various types of feedstocks such as sucrose, starch, lignocellulosic and algal biomass through fermentation process by microorganisms. Compared to other types of microoganisms, yeasts especially Saccharomyces cerevisiae is the common microbes employed in ethanol production due to its high ethanol productivity, high ethanol tolerance and ability of fermenting wide range of sugars. However, there are some challenges in yeast fermentation which inhibit ethanol production such as high temperature, high ethanol concentration and the ability to ferment pentose sugars. Various types of yeast strains have been used in fermentation for ethanol production including hybrid, recombinant and wild-type yeasts. Yeasts can directly ferment simple sugars into ethanol while other type of feedstocks must be converted to fermentable sugars before it can be fermented to ethanol. The common processes involves in ethanol production are pretreatment, hydrolysis and fermentation. Production of bioethanol during fermentation depends on several factors such as temperature, sugar concentration, pH, fermentation time, agitation rate, and inoculum size. The efficiency and productivity of ethanol can be enhanced by immobilizing the yeast cells. This review highlights the different types of yeast strains, fermentation process, factors affecting bioethanol production and immobilization of yeasts for better bioethanol production.
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Affiliation(s)
- Siti Hajar Mohd Azhar
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Rahmath Abdulla
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
- Energy Research Unit, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Siti Azmah Jambo
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Hartinie Marbawi
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Jualang Azlan Gansau
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Ainol Azifa Mohd Faik
- Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
| | - Kenneth Francis Rodrigues
- Biotechnology Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
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194
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Isolation of a Cellulolytic Bacterium from the Lonar Soda Lake and Genomic Analysis of it. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2017. [DOI: 10.22207/jpam.11.2.54] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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195
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Lignin from Micro- to Nanosize: Production Methods. Int J Mol Sci 2017; 18:ijms18061244. [PMID: 28604584 PMCID: PMC5486067 DOI: 10.3390/ijms18061244] [Citation(s) in RCA: 107] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Revised: 06/05/2017] [Accepted: 06/06/2017] [Indexed: 01/07/2023] Open
Abstract
Lignin is the second most abundant biopolymer after cellulose. It has long been obtained as a by-product of cellulose production in pulp and paper production, but had rather low added-value applications. A changing paper market and the emergence of biorefinery projects should generate vast amounts of lignin with the potential of value addition. Nanomaterials offer unique properties and the preparation of lignin nanoparticles and other nanostructures has therefore gained interest as a promising technique to obtain value-added lignin products. Due to lignin’s high structural and chemical heterogeneity, methods must be adapted to these different types. This review focuses on the ability of different formation methods to cope with the huge variety of lignin types and points out which particle characteristics can be achieved by which method. The current research’s main focus is on pH and solvent-shifting methods where the latter can yield solid and hollow particles. Solvent shifting also showed the capability to cope with different lignin types and solvents and antisolvents, respectively. However, process conditions have to be adapted to every type of lignin and reduction of solvent demand or the integration in a biorefinery process chain must be focused.
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196
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Li YC, Gou ZX, Zhang Y, Xia ZY, Tang YQ, Kida K. Inhibitor tolerance of a recombinant flocculating industrial Saccharomyces cerevisiae strain during glucose and xylose co-fermentation. Braz J Microbiol 2017. [PMID: 28629968 PMCID: PMC5628316 DOI: 10.1016/j.bjm.2016.11.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Lignocellulose-derived inhibitors have negative effects on the ethanol fermentation capacity of Saccharomyces cerevisiae. In this study, the effects of eight typical inhibitors, including weak acids, furans, and phenols, on glucose and xylose co-fermentation of the recombinant xylose-fermenting flocculating industrial S. cerevisiae strain NAPX37 were evaluated by batch fermentation. Inhibition on glucose fermentation, not that on xylose fermentation, correlated with delayed cell growth. The weak acids and the phenols showed additive effects. The effect of inhibitors on glucose fermentation was as follows (from strongest to weakest): vanillin > phenol > syringaldehyde > 5-HMF > furfural > levulinic acid > acetic acid > formic acid. The effect of inhibitors on xylose fermentation was as follows (from strongest to weakest): phenol > vanillin > syringaldehyde > furfural > 5-HMF > formic acid > levulinic acid > acetic acid. The NAPX37 strain showed substantial tolerance to typical inhibitors and showed good fermentation characteristics, when a medium with inhibitor cocktail or rape straw hydrolysate was used. This research provides important clues for inhibitors tolerance of recombinant industrial xylose-fermenting S. cerevisiae.
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Affiliation(s)
- Yun-Cheng Li
- College of Architecture and Environment, Sichuan University, Chengdu, China; College of Pharmacy and Bioengineering, Chengdu University, Chengdu, China
| | - Zi-Xi Gou
- College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Ying Zhang
- College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Zi-Yuan Xia
- College of Architecture and Environment, Sichuan University, Chengdu, China
| | - Yue-Qin Tang
- College of Architecture and Environment, Sichuan University, Chengdu, China.
| | - Kenji Kida
- College of Architecture and Environment, Sichuan University, Chengdu, China
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197
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Deparis Q, Claes A, Foulquié-Moreno MR, Thevelein JM. Engineering tolerance to industrially relevant stress factors in yeast cell factories. FEMS Yeast Res 2017; 17:3861662. [PMID: 28586408 PMCID: PMC5812522 DOI: 10.1093/femsyr/fox036] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 06/04/2017] [Indexed: 01/01/2023] Open
Abstract
The main focus in development of yeast cell factories has generally been on establishing optimal activity of heterologous pathways and further metabolic engineering of the host strain to maximize product yield and titer. Adequate stress tolerance of the host strain has turned out to be another major challenge for obtaining economically viable performance in industrial production. Although general robustness is a universal requirement for industrial microorganisms, production of novel compounds using artificial metabolic pathways presents additional challenges. Many of the bio-based compounds desirable for production by cell factories are highly toxic to the host cells in the titers required for economic viability. Artificial metabolic pathways also turn out to be much more sensitive to stress factors than endogenous pathways, likely because regulation of the latter has been optimized in evolution in myriads of environmental conditions. We discuss different environmental and metabolic stress factors with high relevance for industrial utilization of yeast cell factories and the experimental approaches used to engineer higher stress tolerance. Improving stress tolerance in a predictable manner in yeast cell factories should facilitate their widespread utilization in the bio-based economy and extend the range of products successfully produced in large scale in a sustainable and economically profitable way.
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Affiliation(s)
- Quinten Deparis
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, B-3001 KU Leuven, Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Arne Claes
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, B-3001 KU Leuven, Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Maria R. Foulquié-Moreno
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, B-3001 KU Leuven, Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
| | - Johan M. Thevelein
- Laboratory of Molecular Cell Biology, Institute of Botany and Microbiology, B-3001 KU Leuven, Belgium
- Center for Microbiology, VIB, Kasteelpark Arenberg 31, B-3001 Leuven-Heverlee, Flanders, Belgium
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198
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Nikolić S, Lazić V, Veljović Đ, Mojović L. Production of bioethanol from pre-treated cotton fabrics and waste cotton materials. Carbohydr Polym 2017; 164:136-144. [DOI: 10.1016/j.carbpol.2017.01.090] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 01/23/2017] [Accepted: 01/25/2017] [Indexed: 12/18/2022]
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199
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Ryu HJ, Oh KK. Combined De-Algination Process as a Fractionation Strategy for Valorization of Brown Macroalga Saccharina japonica. Appl Biochem Biotechnol 2017; 182:238-249. [PMID: 27858350 DOI: 10.1007/s12010-016-2323-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 11/03/2016] [Indexed: 12/28/2022]
Abstract
A combined process, de-algination followed by enzymatic saccharification, was designed to produce alginate and glucose from Saccharina japonica consecutively. The process conditions of de-algination were optimized separately for each stage of acidification and alkaline extraction. Collectively, the de-algination yield was 70.1% under the following optimized conditions: 2.4 wt% of Na2CO3, 70 °C, and 100 min with the acidified S. japonica immersed in a 0.5 wt% H2SO4 solution for 2 h at room temperature. The glucan content in the de-alginated S. japonica increased to 38.0%, which was approximately fivefold higher than that of the raw S. japonica. The enzymatic hydrolysis of the de-alginated S. japonica almost completed in 9 h, affording 5.2 g (96.8% of glucan digestibility) of glucose at a de-alginated S. japonica loading of 14.2 g.
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Affiliation(s)
- Hyun Jin Ryu
- R&D Center, SugarEn Co., Ltd, Cheonan, Chungnam, 31116, South Korea
| | - Kyeong Keun Oh
- Department of Applied Chemical Engineering, Dankook University, Cheonan, Chungnam, 31116, South Korea.
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200
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Sasaki Y, Takagi T, Motone K, Kuroda K, Ueda M. Enhanced direct ethanol production by cofactor optimization of cell surface-displayed xylose isomerase in yeast. Biotechnol Prog 2017; 33:1068-1076. [PMID: 28393500 DOI: 10.1002/btpr.2478] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/09/2017] [Indexed: 02/03/2023]
Abstract
Xylose isomerase (XylC) from Clostridium cellulovorans can simultaneously perform isomerization and fermentation of d-xylose, the main component of lignocellulosic biomass, and is an attractive candidate enzyme. In this study, we optimized a specified metal cation in a previously established Saccharomyces cerevisiae strain displaying XylC. We investigated the effect of each metal cation on the catalytic function of the XylC-displaying S. cerevisiae. Results showed that the divalent cobalt cations (Co2+ ) especially enhanced the activity by 46-fold. Co2+ also contributed to d-xylose fermentation, which resulted in improving ethanol yields and xylose consumption rates by 6.0- and 2.7-fold, respectively. Utility of the extracellular xylose isomerization system was exhibited in the presence of mixed sugar. XylC-displaying yeast showed the faster d-xylose uptake than the yeast producing XI intracellularly. Furthermore, direct xylan saccharification and fermentation was performed by unique yeast co-culture system. A xylan-degrading yeast strain was established by displaying two kinds of xylanases; endo-1,4-β-xylanase (Xyn11B) from Saccharophagus degradans, and β-xylosidase (XlnD) from Aspergillus niger. The yeast co-culture system enabled fine-tuning of the initial ratios of the displayed enzymes (Xyn11B:XlnD:XylC) by adjusting the inoculation ratios of Xylanases (Xyn11B and XlnD)-displaying yeast and XylC-displaying yeast. When the enzymes were inoculated at the ratio of 1:1:2 (1.39 × 1013 : 1.39 × 1013 : 2.78 × 1013 molecules), 6.0 g/L ethanol was produced from xylan. Thus, the cofactor optimization and the yeast co-culture system developed in this study could expand the prospect of biofuels production from lignocellulosic biomass. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:1068-1076, 2017.
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Affiliation(s)
- Yusuke Sasaki
- Graduate School of Advanced Integrated Studies in Human Survivability, Kyoto University, Sakyo-ku, Kyoto, 606-8306, Japan.,Div. of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,CREST, JST, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Toshiyuki Takagi
- Div. of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,CREST, JST, Sakyo-ku, Kyoto, 606-8502, Japan.,Japan Society for the Promotion of Science, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Keisuke Motone
- Div. of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,CREST, JST, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Kouichi Kuroda
- Div. of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,CREST, JST, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Mitsuyoshi Ueda
- Div. of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.,CREST, JST, Sakyo-ku, Kyoto, 606-8502, Japan
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