1
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Adaptive evolution of Kluyveromyces marxianus MTCC1389 for high ethanol tolerance. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2022. [DOI: 10.1016/j.bcab.2022.102533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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2
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Mohamad Jahis BM, Ilham Z, Supramani S, Sohedein MNA, Ibrahim MF, Abd-Aziz S, Rowan N, Wan-Mohtar WAAQI. Ganodiesel: A New Biodiesel Feedstock from Biomass of the Mushroom Ganoderma lucidum. SUSTAINABILITY 2022; 14:10764. [DOI: 10.3390/su141710764] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
There is a pressing demand for new sustainable eco-friendly approaches to producing green energy worldwide. This study represents the novel production of biodiesel feedstock from the medicinal mushroom Ganoderma lucidum QRS 5120 using state-of-the-art biotechnology tools. Response surface methodology (RSM) was used to enhance G. lucidum production in a repeated-batch fermentation strategy. By referring to the broth replacement ratio (BRR) and broth replacement time point (BRTP), RSM that was formulated using a central composite design (CCD) resulted in a significant model for all tested variables, which are exopolysaccharide (EPS), endopolysaccharide (ENS) and biomass, with BRR (%) of 60, 75 and 90, and BRTP (days) of 11, 13 and 15. The model was validated using the optimised conditions, and the results showed 4.21 g/L of EPS (BRR 77.46% and BRTP 12 days), 2.44 g/L of ENS (BRR 60% and BRTP 12.85 days), and 34.32 g/L of biomass (BRR 89.52% and BRTP 10.96 days) were produced. Biomass produced from the G. lucidum was subsequently used as feedstock for biodiesel production. Approximately 20.36% of lipid was successfully extracted from the dried G. lucidum biomass via a solvent extraction and subsequently converted to Ganodiesel through a transesterification process. The Ganodiesel produced fulfilled most of the international standards, i.e., US (ASTM D6751-08) and EU (EN 14214). Overall, this study demonstrates the optimised G. lucidum production and its lipid production as a new biodiesel feedstock.
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3
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Kong M, Li X, Li T, Zhao X, Jin M, Zhou X, Gu H, Mrša V, Xiao W, Cao L. Overexpressing CCW12 in Saccharomyces cerevisiae enables highly efficient ethanol production from lignocellulose hydrolysates. BIORESOURCE TECHNOLOGY 2021; 337:125487. [PMID: 34320766 DOI: 10.1016/j.biortech.2021.125487] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 06/27/2021] [Accepted: 06/28/2021] [Indexed: 06/13/2023]
Abstract
A Saccharomyces cerevisiae strain CCW12OE was constructed by overexpressing CCW12 in a previously reported strain WXY70 harboring six xylose utilization genes. CCW12OE produced an optimal ethanol yield of 98.8% theoretical value within 48 h in a simulated corn stover hydrolysate. CCW12OEwas comprehensively evaluated for ethanol production in Miscanthus, maize and corncob hydrolysates, among which a 96.1% theoretical value was achieved within 12 h in corncob hydrolysates. Under normal growth conditions, CCW12OE did not display altered cell morphology; however, in the presence of acetate, CCW12OE maintained relatively intact cell structure and increased cell wall thickness by nearly 50%, while WXY70 had abnormal cell morphology and reduced cell wall thickness by nearly 50%. Besides, CCW12OE had higher fermentation capacity than that of WXY70 in undetoxified and detoxified hydrolysates with both aerobic and anaerobic conditions, demonstrating that CCW12 overexpression alone exhibits improved stress resistance and better fermentation performance.
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Affiliation(s)
- Meilin Kong
- Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Xiaowei Li
- Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Tongtong Li
- Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, College of Life Sciences, Capital Normal University, Beijing 100048, China
| | - Xuebing Zhao
- Key Laboratory for Industrial Biocatalysis, Ministry of Education of China, Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Mingjie Jin
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xin Zhou
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Hanqi Gu
- Department of Biology and Food Science, Hebei Normal University for Nationalities, Chengde, Hebei 067000, China
| | - Vladimir Mrša
- Laboratory of Biochemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia
| | - Wei Xiao
- Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, College of Life Sciences, Capital Normal University, Beijing 100048, China; Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Limin Cao
- Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, College of Life Sciences, Capital Normal University, Beijing 100048, China.
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4
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Cortivo PRD, Aydos LF, Hickert LR, Rosa CA, Hector RE, Mertens JA, Ayub MAZ. Performance of xylose-fermenting yeasts in oat and soybean hulls hydrolysate and improvement of ethanol production using immobilized cell systems. Biotechnol Lett 2021; 43:2011-2026. [PMID: 34480641 DOI: 10.1007/s10529-021-03182-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 08/30/2021] [Indexed: 11/25/2022]
Abstract
We investigated the fermentation of a mixture of oat and soybean hulls (1:1) subjected to acid (AH) or enzymatic (EH) hydrolyses, with both showing high osmotic pressures (> 1200 Osm kg-1) for the production of ethanol. Yeasts of genera Spathaspora, Scheffersomyces, Sugiymaella, and Candida, most of them biodiverse Brazilian isolates and previously untested in bioprocesses, were cultivated in these hydrolysates. Spathaspora passalidarum UFMG-CM-469 showed the best ethanol production kinetics in suspended cells cultures in acid hydrolysate, under microaerobic and anaerobic conditions. This strain was immobilized in LentiKats® (polyvinyl alcohol) and cultured in AH and EH. Supplementation of hydrolysates with crude yeast extract and peptone was also performed. The highest ethanol production was obtained using hydrolysates supplemented with crude yeast extract (AH-CYE and EH-CYE) showing yields of 0.40 and 0.44 g g-1, and productivities of 0.39 and 0.29 g (L h)-1, respectively. The reuse of the immobilized cells was tested in sequential fermentations of AH-CYE, EH-CYE, and a mixture of acid and enzymatic hydrolysates (AEH-CYE) operated under batch fluidized bed, with ethanol yields ranging from 0.31 to 0.40 g g-1 and productivities from 0.14 to 0.23 g (L h)-1. These results warrant further research using Spathaspora yeasts for second-generation ethanol production.
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Affiliation(s)
- Paulo Roberto Dall Cortivo
- Biotechnology & Biochemical Engineering Laboratory (BiotecLab), Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil
| | - Luiza Fichtner Aydos
- Biotechnology & Biochemical Engineering Laboratory (BiotecLab), Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil
| | - Lilian Raquel Hickert
- State University of Rio Grande do Sul, Av. Bento Gonçalves, 8855, Porto Alegre, RS, 91540-000, Brazil
| | - Carlos Augusto Rosa
- Department of Microbiology, ICB, C.P. 486, State University of Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Ronald E Hector
- Bioenergy Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 North University Street, Peoria, IL, 61604, USA
| | - Jeffrey A Mertens
- Bioenergy Research Unit, USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 North University Street, Peoria, IL, 61604, USA
| | - Marco Antônio Záchia Ayub
- Biotechnology & Biochemical Engineering Laboratory (BiotecLab), Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, PO Box 15090, Porto Alegre, RS, 91501-970, Brazil.
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5
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Damayanti D, Supriyadi D, Amelia D, Saputri DR, Devi YLL, Auriyani WA, Wu HS. Conversion of Lignocellulose for Bioethanol Production, Applied in Bio-Polyethylene Terephthalate. Polymers (Basel) 2021; 13:2886. [PMID: 34502925 PMCID: PMC8433819 DOI: 10.3390/polym13172886] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 08/16/2021] [Accepted: 08/25/2021] [Indexed: 12/05/2022] Open
Abstract
The increasing demand for petroleum-based polyethylene terephthalate (PET) grows population impacts daily. A greener and more sustainable raw material, lignocellulose, is a promising replacement of petroleum-based raw materials to convert into bio-PET. This paper reviews the recent development of lignocellulose conversion into bio-PET through bioethanol reaction pathways. This review addresses lignocellulose properties, bioethanol production processes, separation processes of bioethanol, and the production of bio-terephthalic acid and bio-polyethylene terephthalate. The article also discusses the current industries that manufacture alcohol-based raw materials for bio-PET or bio-PET products. In the future, the production of bio-PET from biomass will increase due to the scarcity of petroleum-based raw materials.
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Affiliation(s)
- Damayanti Damayanti
- Department of Chemical Engineering and Materials Science, Yuan Ze University, 135 Yuan-Tung Road, Chung-Li, Taoyuan 32003, Taiwan;
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Didik Supriyadi
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Devita Amelia
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Desi Riana Saputri
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Yuniar Luthfia Listya Devi
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Wika Atro Auriyani
- Department of Chemical Engineering, Institut Teknologi Sumatera, Jl. Terusan Ryacudu, Way Huwi, Kec. Jati Agung, Lampung Selatan, Lampung 35365, Indonesia; (D.S.); (D.A.); (D.R.S.); (Y.L.L.D.); (W.A.A.)
| | - Ho Shing Wu
- Department of Chemical Engineering and Materials Science, Yuan Ze University, 135 Yuan-Tung Road, Chung-Li, Taoyuan 32003, Taiwan;
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6
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Medium design from corncob hydrolyzate for pigment production by Talaromyces atroroseus GH2: Kinetics modeling and pigments characterization. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107698] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Lin F, Liu C, Wang X, Hu C, Wu S, Xiao R. Catalytic oxidation of biorefinery corncob lignin via zirconium(IV) chloride and sodium hydroxide in acetonitrile/water: A functionality study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 675:203-212. [PMID: 31030128 DOI: 10.1016/j.scitotenv.2019.04.224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/14/2019] [Accepted: 04/15/2019] [Indexed: 06/09/2023]
Abstract
In order to realize the efficient utilization of biorefinery corncob lignin, the promising catalytic oxidation strategy was carried out by using ZrCl4 and NaOH as the co-catalyst and dioxygen as the oxidant in MeCN/H2O. GC/MS, GC-FID, and MALDI-TOF/MS were employed to recognize the produced monomers and oligomers, and GPC was used to monitor the molecular weight changes of lignin fragments. In addition, specific structural evolution of corncob lignin during ZrCl4/NaOH-catalyzed oxidation were revealed by quantitative 13C (Q13C) and 2D HSQC NMR techniques. Results showed that the total yields of produced oxidation monomers reached 6.8 wt%, and aromatic aldehydes were the major species, in which vanillin and 4-hydroxybenzaldehyde were the two dominant products. After ZrCl4/NaOH-catalyzed oxidation, the weight-average molecular weight of corncob lignin and its products decreased from 2000 Da to 300 Da after oxidation with 16 h. Moreover, Q13C NMR analysis showed the decrease percentage of CO aliphatic carbons (including methoxyl carbons), the increase percentage of CC aliphatic and carbonyl carbons, and the relative stable percentage of aromatic carbons with reaction prolonged. These results combined with the further confirmation from HSQC indicated the oxidative cleavage of CO aliphatic linkages and removal of methoxy groups within corncob lignin, as well as the formation of CC aliphatic bonds and carbonyl groups. The work presented a comprehensive insight into the catalytic oxidative depolymerization of biorefinery corncob lignin.
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Affiliation(s)
- Fei Lin
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China
| | - Chao Liu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China
| | - Xing Wang
- Liaoning Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, PR China
| | - Changsong Hu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China
| | - Shiliang Wu
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China
| | - Rui Xiao
- Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, PR China.
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8
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Saini P, Beniwal A, Kokkiligadda A, Vij S. Response and tolerance of yeast to changing environmental stress during ethanol fermentation. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.07.001] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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9
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Hama S, Kihara M, Noda H, Kondo A. Development of cell recycle technology incorporating nutrient supplementation for lignocellulosic ethanol fermentation using industrial yeast Saccharomyces cerevisiae. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2018.05.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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10
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Yu JL, Qian ZG, Zhong JJ. Advances in bio-based production of dicarboxylic acids longer than C4. Eng Life Sci 2018; 18:668-681. [PMID: 32624947 DOI: 10.1002/elsc.201800023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 05/18/2018] [Accepted: 06/13/2018] [Indexed: 12/15/2022] Open
Abstract
Growing concerns of environmental pollution and fossil resource shortage are major driving forces for bio-based production of chemicals traditionally from petrochemical industry. Dicarboxylic acids (DCAs) are important platform chemicals with large market and wide applications, and here the recent advances in bio-based production of straight-chain DCAs longer than C4 from biological approaches, especially by synthetic biology, are reviewed. A couple of pathways were recently designed and demonstrated for producing DCAs, even those ranging from C5 to C15, by employing respective starting units, extending units, and appropriate enzymes. Furthermore, in order to achieve higher production of DCAs, enormous efforts were made in engineering microbial hosts that harbored the biosynthetic pathways and in improving properties of biocatalytic elements to enhance metabolic fluxes toward target DCAs. Here we summarize and discuss the current advantages and limitations of related pathways, and also provide perspectives on synthetic pathway design and optimization for hyper-production of DCAs.
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Affiliation(s)
- Jia-Le Yu
- State Key Laboratory of Microbial Metabolism Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai P. R. China.,State Key Laboratory of Bioreactor Engineering, School of Biotechnology East China University of Science and Technology Shanghai P. R. China
| | - Zhi-Gang Qian
- State Key Laboratory of Microbial Metabolism Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai P. R. China.,Shanghai Collaborative Innovation Center for Biomanufacturing Technology (SCICBT) East China University of Science and Technology Shanghai P. R. China
| | - Jian-Jiang Zhong
- State Key Laboratory of Microbial Metabolism Joint International Research Laboratory of Metabolic and Developmental Sciences, School of Life Sciences and Biotechnology Shanghai Jiao Tong University Shanghai P. R. China.,State Key Laboratory of Bioreactor Engineering, School of Biotechnology East China University of Science and Technology Shanghai P. R. China.,Shanghai Collaborative Innovation Center for Biomanufacturing Technology (SCICBT) East China University of Science and Technology Shanghai P. R. China
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11
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Liu J, Li G, Sui Y. Optimization of Culture Medium Enhances Viable Biomass Production and Biocontrol Efficacy of the Antagonistic Yeast, Candida diversa. Front Microbiol 2017; 8:2021. [PMID: 29089939 PMCID: PMC5650984 DOI: 10.3389/fmicb.2017.02021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 10/03/2017] [Indexed: 11/13/2022] Open
Abstract
Viable biomass production is a key determinant of suitability of antagonistic yeasts as potential biocontrol agents. This study investigated the effects of three metal ions (magnesium, ferrous, and zinc) on biomass production and viability of the antagonistic yeast, Candida diversa. Using response surface methodology to optimize medium components, a maximum biomass was obtained, when the collective Mg2+, Fe2+, and Zn2+ concentrations were adjusted in a minimal mineral (MM) medium. Compared with the unmodified MM, and three ion-deficient MM media, yeast cells cultured in the three ion-modified MM medium exhibited a lower level of cellular oxidative damage, and a higher level of antioxidant enzyme activity. A biocontrol assay indicated that C. diversa grown in the ion-modified MM exhibited the greatest level of control of gray mold on apple fruit. These results provide new information on culture medium optimization to grow yeast antagonists in order to improve biomass production and biocontrol efficacy.
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Affiliation(s)
- Jia Liu
- Chongqing Key Laboratory of Economic Plant Biotechnology, Collaborative Innovation Centre of Special Plant Industry in Chongqing, College of Forestry and Life Science, Institute of Special Plants, Chongqing University of Arts and Sciences, Chongqing, China
| | - Guangkun Li
- School of Food Science and Engineering, Hefei University of Technology, Hefei, China
| | - Yuan Sui
- Chongqing Key Laboratory of Economic Plant Biotechnology, Collaborative Innovation Centre of Special Plant Industry in Chongqing, College of Forestry and Life Science, Institute of Special Plants, Chongqing University of Arts and Sciences, Chongqing, China
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12
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Santos VAQ, Cruz CHG. Zymomonas mobilis IMMOBILIZED ON LOOFA SPONGE AND SUGARCANE BAGASSE FOR LEVAN AND ETHANOL PRODUCTION USING REPEATED BATCH FERMENTATION. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2017. [DOI: 10.1590/0104-6632.20170342s20150350] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Yue F, Zhang J, Pedersen CM, Wang Y, Zhao T, Wang P, Liu Y, Qian G, Qiao Y. Valorization of Furfural Residue by Hydrothermal Carbonization: Processing Optimization, Chemical and Structural Characterization. ChemistrySelect 2017. [DOI: 10.1002/slct.201602026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fen Yue
- School of Environmental and Chemical Engineering; Shanghai University; Shangda Road 99 Shanghai 200444 PR China
- Analytical Instrumentation Center; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
| | - Jia Zhang
- School of Environmental and Chemical Engineering; Shanghai University; Shangda Road 99 Shanghai 200444 PR China
| | | | - Yingxiong Wang
- State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
| | - Tingting Zhao
- Analytical Instrumentation Center; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
| | - Pengfei Wang
- Analytical Instrumentation Center; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
| | - Yequn Liu
- Analytical Instrumentation Center; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
| | - Guangren Qian
- School of Environmental and Chemical Engineering; Shanghai University; Shangda Road 99 Shanghai 200444 PR China
| | - Yan Qiao
- Analytical Instrumentation Center; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
- State Key Laboratory of Coal Conversion; Institute of Coal Chemistry, Chinese Academy of Sciences; 27 South Taoyuan Road Taiyuan 030001 P. R. China
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14
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Ma K, He M, You H, Pan L, Hu G, Cui Y, Maeda T. Enhanced fuel ethanol production from rice straw hydrolysate by an inhibitor-tolerant mutant strain of Scheffersomyces stipitis. RSC Adv 2017. [DOI: 10.1039/c7ra04049k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel process for bioethanol production from lignocellulosic biomass using an inhibitor-tolerant mutant strain of Scheffersomyces stipitis and cell-recycling continuous fermentation.
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Affiliation(s)
- Kedong Ma
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
- Key Laboratory of Development and Application of Rural Renewable Energy
| | - Mingxiong He
- Key Laboratory of Development and Application of Rural Renewable Energy
- Ministry of Agriculture
- Biomass Energy Technology Research Centre
- Biogas Institute of Ministry of Agriculture
- Chengdu 610041
| | - Huiyan You
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
| | - Liwei Pan
- College of Environmental and Chemical Engineering
- Dalian University
- Dalian 116622
- PR China
| | - Guoquan Hu
- Key Laboratory of Development and Application of Rural Renewable Energy
- Ministry of Agriculture
- Biomass Energy Technology Research Centre
- Biogas Institute of Ministry of Agriculture
- Chengdu 610041
| | - Yubo Cui
- Department of Environmental Science and Technology
- Dalian Nationalities University
- Dalian 116600
- PR China
| | - Toshinari Maeda
- Department of Biological Functions Engineering
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
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15
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Roohina F, Mohammadi M, Najafpour GD. Immobilized Kluyveromyces marxianus cells in carboxymethyl cellulose for production of ethanol from cheese whey: experimental and kinetic studies. Bioprocess Biosyst Eng 2016; 39:1341-9. [DOI: 10.1007/s00449-016-1610-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 04/16/2016] [Indexed: 11/30/2022]
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16
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Dynamics of yeast immobilized-cell fluidized-bed bioreactors systems in ethanol fermentation from lactose-hydrolyzed whey and whey permeate. Bioprocess Biosyst Eng 2015; 39:141-50. [PMID: 26527573 DOI: 10.1007/s00449-015-1498-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 10/26/2015] [Indexed: 10/22/2022]
Abstract
We studied the dynamics of ethanol production on lactose-hydrolyzed whey (LHW) and lactose-hydrolyzed whey permeate (LHWP) in batch fluidized-bed bioreactors using single and co-cultures of immobilized cells of industrial strains of Saccharomyces cerevisiae and non-industrial strains of Kluyveromyces marxianus. Although the co-culture of S. cerevisiae CAT-1 and K. marxianus CCT 4086 produced two- to fourfold the ethanol productivity of single cultures of S. cerevisiae, the single cultures of the K. marxianus CCT 4086 produced the best results in both media (Y EtOH/S = 0.47-0.49 g g(-1) and Q P = 1.39-1.68 g L(-1) h(-1), in LHW and LHWP, respectively). Ethanol production on concentrated LHWP (180 g L(-1)) reached 79.1 g L(-1), with yields of 0.46 g g(-1) for K. marxianus CCT 4086 cultures. Repeated batches of fluidized-bed bioreactor on concentrated LHWP led to increased ethanol productivity, reaching 2.8 g L(-1) h(-1).
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17
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Xie L, Zhao J, Wu J, Gao M, Zhao Z, Lei X, Zhao Y, Yang W, Gao X, Ma C, Liu H, Wu F, Wang X, Zhang F, Guo P, Dai G. Efficient hydrolysis of corncob residue through cellulolytic enzymes from Trichoderma strain G26 and L-lactic acid preparation with the hydrolysate. BIORESOURCE TECHNOLOGY 2015; 193:331-336. [PMID: 26143000 DOI: 10.1016/j.biortech.2015.06.101] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 06/18/2015] [Accepted: 06/19/2015] [Indexed: 06/04/2023]
Abstract
To prepare fermentable hydrolysate from corncob residue (CCR), Trichoderma strain G26 was cultured on medium containing CCR for production of cellulolytic enzymes through solid-state fermentation (SSF), resulting in 71.3 IU/g (FPA), 136.2 IU/g (CMCase), 85.1 IU/g (β-glucosidase) and 11,344 IU/g (xylanase), respectively. Through a three-stage saccharification strategy, CCR was hydrolyzed by the enzymatic solution (6.5 FPU/ml) into fermentable hydrolysate containing 60.1g/l glucose (81.2% cellulose was converted at solid loading of 12.5%), 21.4% higher than that by the one-stage method. And then the hydrolysate was used to produce L-lactic acid by a previous screened strain Bacillus coagulans ZX25 in the submerged fermentation. 52.0 g/l L-lactic acid was obtained after fermentation for 44 h, with 86.5% glucose being converted to L-lactic acid. The results indicate that the strains and the hydrolysis strategy are promising for commercial production of L-lactic acid from CCR and other biomass.
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Affiliation(s)
- Lulu Xie
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Jin Zhao
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Jian Wu
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Mingfu Gao
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Zhewei Zhao
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Xiangyun Lei
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Yi Zhao
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Wei Yang
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Xiaoxue Gao
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Cuiyun Ma
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Huanfei Liu
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Fengjuan Wu
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Xingxing Wang
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Fengwei Zhang
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Pengyuan Guo
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China
| | - Guifu Dai
- School of Life Sciences, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, China.
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18
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Najah M, Calbrix R, Mahendra-Wijaya IP, Beneyton T, Griffiths AD, Drevelle A. Droplet-based microfluidics platform for ultra-high-throughput bioprospecting of cellulolytic microorganisms. ACTA ACUST UNITED AC 2015; 21:1722-32. [PMID: 25525991 DOI: 10.1016/j.chembiol.2014.10.020] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 09/30/2014] [Accepted: 10/20/2014] [Indexed: 01/05/2023]
Abstract
Discovery of microorganisms producing enzymes that can efficiently hydrolyze cellulosic biomass is of great importance for biofuel production. To date, however, only a miniscule fraction of natural biodiversity has been tested because of the relatively low throughput of screening systems and their limitation to screening only culturable microorganisms. Here, we describe an ultra-high-throughput droplet-based microfluidic system that allowed the screening of over 100,000 cells in less than 20 min. Uncultured bacteria from a wheat stubble field were screened directly by compartmentalization of single bacteria in 20 pl droplets containing a fluorogenic cellobiohydrolase substrate. Sorting of droplets based on cellobiohydrolase activity resulted in a bacterial population with 17- and 7-fold higher cellobiohydrolase and endogluconase activity, respectively, and very different taxonomic diversity than when selected for growth on medium containing starch and carboxymethylcellulose as carbon source.
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Affiliation(s)
- Majdi Najah
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, CNRS UMR 7006, 8 allée Gaspard Monge, 67083 Strasbourg Cedex, France; Division Biotechnologies, Ets. J. Soufflet, quai Sarrail, 10400 Nogent-sur-Seine, France
| | - Raphaël Calbrix
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, CNRS UMR 7006, 8 allée Gaspard Monge, 67083 Strasbourg Cedex, France
| | - I Putu Mahendra-Wijaya
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, CNRS UMR 7006, 8 allée Gaspard Monge, 67083 Strasbourg Cedex, France; Division Biotechnologies, Ets. J. Soufflet, quai Sarrail, 10400 Nogent-sur-Seine, France
| | - Thomas Beneyton
- École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI ParisTech), CNRS UMR 8231, 10 rue Vauquelin, 75231 Paris Cedex 05, France
| | - Andrew D Griffiths
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, CNRS UMR 7006, 8 allée Gaspard Monge, 67083 Strasbourg Cedex, France; École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI ParisTech), CNRS UMR 8231, 10 rue Vauquelin, 75231 Paris Cedex 05, France.
| | - Antoine Drevelle
- Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, CNRS UMR 7006, 8 allée Gaspard Monge, 67083 Strasbourg Cedex, France; Division Biotechnologies, Ets. J. Soufflet, quai Sarrail, 10400 Nogent-sur-Seine, France.
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19
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Gu H, Zhang J, Bao J. High tolerance and physiological mechanism of Zymomonas mobilis to phenolic inhibitors in ethanol fermentation of corncob residue. Biotechnol Bioeng 2015; 112:1770-82. [PMID: 25851269 DOI: 10.1002/bit.25603] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Revised: 03/13/2015] [Accepted: 03/16/2015] [Indexed: 11/06/2022]
Abstract
Corncob residue as the lignocellulosic biomass accumulated phenolic compounds generated from xylitol production industry. For utilization of this biomass, Zymomonas mobilis ZM4 was tested as the ethanol fermenting strain and presented a better performance of cell growth (2.8 × 10(8) CFU/mL) and ethanol fermentability (54.42 g/L) in the simultaneous saccharification and fermentation (SSF) than the typical robust strain Saccharomyces cerevisiae DQ1 (cell growth of 2.9 × 10(7) CFU/mL, ethanol titer of 48.6 g/L). The physiological response of Z. mobilis ZM4 to the twelve typical phenolic compounds derived from lignocellulose was assayed and compared with that of S. cerevisiae DQ1. Z. mobilis ZM4 showed nearly the same tolerance to the phenolic aldehydes with S. cerevisiae DQ1, but the stronger tolerance to the phenolic acids existing in corncob residue (2-furoic acid, p-hydroxybenzoic acid, p-coumaric acid, vanillic acid, ferulic acid, and syringic acid). The tolerance mechanism of Z. mobilis was investigated in terms of inhibitor degradation, cell morphology and membrane permeability under the stress of phenolics using GC-MS, scanning and transmission electron microscopies (SEM and TEM), as well as fluorescent probes. The results reveal that Z. mobilis ZM4 has the capability for in situ detoxification of phenolic aldehydes, and the lipopolysaccharide aggregation on the cell outer membrane of Z. mobilis ZM4 provided the permeable barrier to the attack of phenolic acids.
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Affiliation(s)
- Hanqi Gu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Jian Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
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20
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Qi K, Xia XX, Zhong JJ. Enhanced anti-oxidative activity and lignocellulosic ethanol production by biotin addition to medium in Pichia guilliermondii fermentation. BIORESOURCE TECHNOLOGY 2015; 189:36-43. [PMID: 25864029 DOI: 10.1016/j.biortech.2015.02.089] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Revised: 02/21/2015] [Accepted: 02/23/2015] [Indexed: 06/04/2023]
Abstract
Commercialization of lignocellulosic ethanol fermentation requires its high titer, but the reactive oxygen species (ROS) accumulation during the bioprocess damaged the cells and compromised this goal. To improve the cellular anti-oxidative activity during non-detoxified corncob residue hydrolysate fermentation, seed cells were prepared to possess a higher level of intracellular biotin pool (IBP), which facilitated the biosyntheses of catalase and porphyrin. As a result, the catalase activity increased by 1.3-folds compared to control while the ROS level reduced by 50%. Cell viability in high-IBP cells was 1.7-folds of control and the final ethanol titer increased from 31.2 to 41.8 g L(-1) in batch fermentation. The high-IBP cells were further used for repeated-batch fermentation in the non-detoxified lignocellulosic hydrolysate, and the highest titer and average productivity of ethanol reached 63.7 g L(-1) and 1.2 g L(-1)h(-1). The results were favorable to future industrial application of this lignocellulosic bioethanol process.
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Affiliation(s)
- Kai Qi
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
| | - Xiao-Xia Xia
- State Key Laboratory of Microbial Metabolism, and Lab. of Molecular Biochemical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China.
| | - Jian-Jiang Zhong
- State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; State Key Laboratory of Microbial Metabolism, and Lab. of Molecular Biochemical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China.
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21
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Zhou TC, Zhong JJ. Production of validamycin A from hemicellulose hydrolysate by Streptomyces hygroscopicus 5008. BIORESOURCE TECHNOLOGY 2015; 175:160-166. [PMID: 25459817 DOI: 10.1016/j.biortech.2014.10.051] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 10/09/2014] [Accepted: 10/10/2014] [Indexed: 06/04/2023]
Abstract
Validamycin A (VAL-A) is an important agricultural antibiotic produced by Streptomyces hygroscopicus 5008, which uses starch as carbon source occupying about 20% of total production cost. To reduce the medium cost, corncob hydrolysate - a hemicellulose hydrolysate was applied as a low-cost substrate to VAL-A fermentation. It was found that three major sugars in corncob hydrolysate including d-glucose, d-xylose and l-arabinose could all be utilized by S. hygroscopicus 5008 to produce VAL-A while d-xylose was the main contributor. A higher VAL-A production titer from d-xylose was achieved by using a genetically engineered strain TC03 derived from S. hygroscopicus 5008, which resulted in 1.27-fold improvement of VAL-A production from the medium containing 13% (v/v) corncob hydrolysate compared to that by its original strain. A medium cost analysis was done and compared with previous reports. This work indicates a great potential of the hemicellulose hydrolysate as substrate for antibiotic fermentation.
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Affiliation(s)
- Tan-Che Zhou
- State Key Laboratory of Microbial Metabolism, and Laboratory of Molecular Biochemical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China
| | - Jian-Jiang Zhong
- State Key Laboratory of Microbial Metabolism, and Laboratory of Molecular Biochemical Engineering, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 800 Dong-Chuan Road, Shanghai 200240, China; Shanghai Collaborative Innovation Center for Biomanufacturing Technology (SCICBT), East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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22
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Liu Z, Inokuma K, Ho SH, Haan RD, Hasunuma T, van Zyl WH, Kondo A. Combined cell-surface display- and secretion-based strategies for production of cellulosic ethanol with Saccharomyces cerevisiae. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:162. [PMID: 26413161 PMCID: PMC4584016 DOI: 10.1186/s13068-015-0344-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Accepted: 09/18/2015] [Indexed: 05/12/2023]
Abstract
BACKGROUND Engineering Saccharomyces cerevisiae to produce heterologous cellulases is considered as a promising strategy for production of bioethanol from lignocellulose. The production of cellulase is usually pursued by one of the two strategies: displaying enzyme on the cell surface or secreting enzyme into the medium. However, to our knowledge, the combination of the two strategies in a yeast strain has not been employed. RESULTS In this study, heterologous endoglucanase (EG) and cellobiohydrolase I (CBHI) were produced in a β-glucosidase displaying S. cerevisiae strain using cell-surface display, secretion, or a combined strategy. Strains EG-D-CBHI-D and EG-S-CBHI-S (with both enzymes displayed on the cell surface or with both enzymes secreted to the surrounding medium) showed higher ethanol production (2.9 and 2.6 g/L from 10 g/L phosphoric acid swollen cellulose, respectively), than strains EG-D-CBHI-S and EG-S-CBHI-D (with EG displayed on cell surface and CBHI secreted, or vice versa). After 3-cycle repeated-batch fermentation, the cellulose degradation ability of strain EG-D-CBHI-D remained 60 % of the 1st batch, at a level that was 1.7-fold higher than that of strain EG-S-CBHI-S. CONCLUSIONS This work demonstrated that placing EG and CBHI in the same space (on the cell surface or in the medium) was favorable for amorphous cellulose-based ethanol fermentation. In addition, the cellulolytic yeast strain that produced enzymes by the cell-surface display strategy performed better in cell-recycle batch fermentation compared to strains producing enzymes via the secretion strategy.
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Affiliation(s)
- Zhuo Liu
- />Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Kentaro Inokuma
- />Organization of Advanced Science and Technology, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Shih-Hsin Ho
- />Organization of Advanced Science and Technology, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
- />State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090 People’s Republic of China
| | - Riaan den Haan
- />Department of Biotechnology, University of the Western Cape, Bellville, 7530 South Africa
| | - Tomohisa Hasunuma
- />Organization of Advanced Science and Technology, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
| | - Willem H. van Zyl
- />Department of Microbiology, University of Stellenbosch, Stellenbosch, 7600 South Africa
| | - Akihiko Kondo
- />Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, 657-8501 Japan
- />Biomass Engineering Program, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045 Japan
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23
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Lei C, Zhang J, Xiao L, Bao J. An alternative feedstock of corn meal for industrial fuel ethanol production: delignified corncob residue. BIORESOURCE TECHNOLOGY 2014; 167:555-9. [PMID: 25027810 DOI: 10.1016/j.biortech.2014.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 06/01/2014] [Accepted: 06/03/2014] [Indexed: 05/23/2023]
Abstract
Delignified corncob residue is an industrial solid waste from xylose production using corncob as feedstock. In this study, delignified corncob residue was used as the feedstock of ethanol production by simultaneous saccharification and fermentation (SSF) and the optimal fermentation performance was investigated under various operation conditions. The ethanol titer and yield reached 75.07 g/L and 89.38%, respectively, using a regular industrial yeast strain at moderate cellulase dosage and high solids loading. A uniform SSF temperature of 37°C at both prehydrolysis and SSF stages was tested. The fermentation performance and cost of delignified corncob residue and corn meal was compared as feedstock of ethanol fermentation. The result shows that the delignified corncob residue is competitive to corn meal as ethanol production feedstock. The study gives a typical case to demonstrate the potential of intensively processed lignocellulose as the alternative feedstock of corn meal for industrial fuel ethanol production.
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Affiliation(s)
- Cheng Lei
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jian Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China; Key Laboratory for Solid Waste Management and Environment Safety, Ministry of Education of China, Tsinghua University, Beijing 10084, China
| | - Lin Xiao
- Shandong Longlive Biotechnology Co., High-Tech Development Zone, Yucheng, Shandong 251200, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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24
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Triggering respirofermentative metabolism in the crabtree-negative yeast Pichia guilliermondii by disrupting the CAT8 gene. Appl Environ Microbiol 2014; 80:3879-87. [PMID: 24747899 DOI: 10.1128/aem.00854-14] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Pichia guilliermondii is a Crabtree-negative yeast that does not normally exhibit respirofermentative metabolism under aerobic conditions, and methods to trigger this metabolism may have applications for physiological study and industrial applications. In the present study, CAT8, which encodes a putative global transcriptional activator, was disrupted in P. guilliermondii. This yeast's ethanol titer increased by >20-fold compared to the wild type (WT) during aerobic fermentation using glucose. A comparative transcriptional analysis indicated that the expression of genes in the tricarboxylic acid cycle and respiratory chain was repressed in the CAT8-disrupted (ΔCAT8) strain, while the fermentative pathway genes were significantly upregulated. The respiratory activities in the ΔCAT8 strain, indicated by the specific oxygen uptake rate and respiratory state value, decreased to one-half and one-third of the WT values, respectively. In addition, the expression of HAP4, a transcriptional respiratory activator, was significantly repressed in the ΔCAT8 strain. Through disruption of HAP4, the ethanol production of P. guilliermondii was also increased, but the yield and titer were lower than that in the ΔCAT8 strain. A further transcriptional comparison between ΔCAT8 and ΔHAP4 strains suggested a more comprehensive reprogramming function of Cat8 in the central metabolic pathways. These results indicated the important role of CAT8 in regulating the glucose metabolism of P. guilliermondii and that the regulation was partially mediated by repressing HAP4. The strategy proposed here might be applicable to improve the aerobic fermentation capacity of other Crabtree-negative yeasts.
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25
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ElMekawy A, Diels L, De Wever H, Pant D. Valorization of cereal based biorefinery byproducts: reality and expectations. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:9014-27. [PMID: 23931701 PMCID: PMC3774676 DOI: 10.1021/es402395g] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The growth of the biobased economy will lead to an increase in new biorefinery activities. All biorefineries face the regular challenges of efficiently and economically treating their effluent to be compatible with local discharge requirements and to minimize net water consumption. The amount of wastes resulting from biorefineries industry is exponentially growing. The valorization of such wastes has drawn considerable attention with respect to resources with an observable economic and environmental concern. This has been a promising field which shows great prospective toward byproduct usage and increasing value obtained from the biorefinery. However, full-scale realization of biorefinery wastes valorization is not straightforward because several microbiological, technological and economic challenges need to be resolved. In this review we considered valorization options for cereals based biorefineries wastes while identifying their challenges and exploring the opportunities for future process.
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Affiliation(s)
- Ahmed ElMekawy
- Separation
and Conversion Technologies, VITO-Flemish Institute for
Technological Research,
Boeretang 200, 2400 Mol, Belgium
- Genetic Engineering and Biotechnology
Research Institute, Minufiya University, Sadat City, Egypt
| | - Ludo Diels
- Separation
and Conversion Technologies, VITO-Flemish Institute for
Technological Research,
Boeretang 200, 2400 Mol, Belgium
| | - Heleen De Wever
- Separation
and Conversion Technologies, VITO-Flemish Institute for
Technological Research,
Boeretang 200, 2400 Mol, Belgium
| | - Deepak Pant
- Separation
and Conversion Technologies, VITO-Flemish Institute for
Technological Research,
Boeretang 200, 2400 Mol, Belgium
- Phone: +32 14336969; fax: +32 14326586; e-mail: ;
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