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Abdullabekova DA, Magomedova ES, Magomedov GG, Kachalkin AV. Yeasts as an Element of Ampelocenosis Soil Biodiversity in an Arid Climate. ARID ECOSYSTEMS 2021. [DOI: 10.1134/s2079096121030021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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High solids all-inclusive polysaccharide hydrolysis of steam-exploded corn pericarp by periodic peristalsis. Carbohydr Polym 2020; 246:116483. [PMID: 32747226 DOI: 10.1016/j.carbpol.2020.116483] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 11/20/2022]
Abstract
A new sequence of steam explosion (SE) with periodic peristalsis (PP) exploited to fractionate corn pericarp (CP), and its high solid cellulosic hydrolysis to increase sugar yield. In this investigation, the optimum SE-condition was 0.8 MPa/5 min., recovered around 12.62 % total sugars than untreated CP, whereas glucan and xylan digestibility reached around 97 % and 87 %, respectively. Besides that, the unground SECP conversion increased by 27.10 % glucan and 34.18 % xylan than the ground one. FE-SEM, FTIR, XRD results confirmed that SE significantly fractionated the amorphous substances that driven the increment of the crystallinity index. SE changed the functional groups without altering the lignin, and also the formation of degradations products was negligible and not detrimental to sugars conversion. An unpolluted SEPP enzymatic hydrolysis system at high solid loading (25 %) with compatible low cellulase dose (15 FPU g-1 solids) was beneficial to intensified sugars conversion.
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Packard H, Taylor ZW, Williams SL, Guimarães PI, Toth J, Jensen RV, Senger RS, Kuhn DD, Stevens AM. Identification of soil bacteria capable of utilizing a corn ethanol fermentation byproduct. PLoS One 2019; 14:e0212685. [PMID: 30849084 PMCID: PMC6407766 DOI: 10.1371/journal.pone.0212685] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 02/07/2019] [Indexed: 11/19/2022] Open
Abstract
A commercial corn ethanol production byproduct (syrup) was used as a bacterial growth medium with the long-term aim to repurpose the resulting microbial biomass as a protein supplement in aquaculture feeds. Anaerobic batch reactors were used to enrich for soil bacteria metabolizing the syrup as the sole nutrient source over an eight-day period with the goal of obtaining pure cultures of facultative organisms from the reactors. Amplification of the V4 variable region of the 16S rRNA gene was performed using barcoded primers to track the succession of microbes enriched for during growth on the syrup. The resulting PCR products were sequenced using Illumina MiSeq protocols, analyzed via the program QIIME, and the alpha-diversity was calculated. Seven bacterial families were the most prevalent in the bioreactor community after eight days of enrichment: Clostridiaceae, Alicyclobacillaceae, Ruminococcaceae, Burkholderiaceae, Bacillaceae, Veillonellaceae, and Enterobacteriaceae. Pure culture isolates obtained from the reactors, and additional laboratory stock strains, capable of facultative growth, were grown aerobically in microtiter plates with the syrup substrate to monitor growth yield. Reactor isolates of interest were identified at a species level using the full 16S rRNA gene and other biomarkers. Bacillus species, commonly used as probiotics in aquaculture, showed the highest biomass yield of the monocultures examined. Binary combinations of monocultures yielded no apparent synergism between organisms, suggesting competition for nutrients instead of cooperative metabolite conversion.
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Affiliation(s)
- Holly Packard
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, United States of America
| | - Zachary W. Taylor
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, United States of America
| | - Stephanie L. Williams
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, United States of America
| | - Pedro Ivo Guimarães
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, United States of America
| | - Jackson Toth
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, United States of America
| | - Roderick V. Jensen
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, United States of America
| | - Ryan S. Senger
- Department of Biological Systems Engineering, Virginia Tech, Blacksburg, VA, United States of America
- Department of Chemical Engineering, Virginia Tech, Blacksburg, VA, United States of America
| | - David D. Kuhn
- Department of Food Science and Technology, Virginia Tech, Blacksburg, VA, United States of America
| | - Ann M. Stevens
- Department of Biological Sciences, Virginia Tech, Blacksburg, VA, United States of America
- * E-mail:
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Irmak S, Canisag H, Vokoun C, Meryemoglu B. Xylitol production from lignocellulosics: Are corn biomass residues good candidates? BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2017. [DOI: 10.1016/j.bcab.2017.07.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Xylitol production by genetically modified industrial strain of Saccharomyces cerevisiae using glycerol as co-substrate. ACTA ACUST UNITED AC 2017; 44:961-971. [DOI: 10.1007/s10295-017-1914-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 01/29/2017] [Indexed: 10/20/2022]
Abstract
Abstract
Xylitol is commercially used in chewing gum and dental care products as a low calorie sweetener having medicinal properties. Industrial yeast strain of S. cerevisiae was genetically modified to overexpress an endogenous aldose reductase gene GRE3 and a xylose transporter gene SUT1 for the production of xylitol. The recombinant strain (XP-RTK) carried the expression cassettes of both the genes and the G418 resistance marker cassette KanMX integrated into the genome of S. cerevisiae. Short segments from the 5′ and 3′ delta regions of the Ty1 retrotransposons were used as homology regions for integration of the cassettes. Xylitol production by the industrial recombinant strain was evaluated using hemicellulosic hydrolysate of the corn cob with glucose as the cosubstrate. The recombinant strain XP-RTK showed significantly higher xylitol productivity (212 mg L−1 h−1) over the control strain XP (81 mg L−1 h−1). Glucose was successfully replaced by glycerol as a co-substrate for xylitol production by S. cerevisiae. Strain XP-RTK showed the highest xylitol productivity of 318.6 mg L−1 h−1 and titre of 47 g L−1 of xylitol at 12 g L−1 initial DCW using glycerol as cosubstrate. The amount of glycerol consumed per amount of xylitol produced (0.47 mol mol−1) was significantly lower than glucose (23.7 mol mol−1). Fermentation strategies such as cell recycle and use of the industrial nitrogen sources were demonstrated using hemicellulosic hydrolysate for xylitol production.
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Kogje A, Ghosalkar A. Xylitol production by Saccharomyces cerevisiae overexpressing different xylose reductases using non-detoxified hemicellulosic hydrolysate of corncob. 3 Biotech 2016; 6:127. [PMID: 28330197 PMCID: PMC4909029 DOI: 10.1007/s13205-016-0444-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 05/25/2016] [Indexed: 02/03/2023] Open
Abstract
Xylitol production was compared in fed batch fermentation by Saccharomyces cerevisiae strains overexpressing xylose reductase (XR) genes from Candida tropicalis, Pichia stipitis, Neurospora crassa, and an endogenous gene GRE3. The gene encoding a xylose specific transporter (SUT1) from P. stipitis was cloned to improve xylose transport and fed batch fermentation was used with glucose as a cosubstrate to regenerate NADPH. Xylitol yield was near theoretical for all the strains in fed batch fermentation. The highest volumetric (0.28 gL-1 h-1) and specific (34 mgg-1 h-1) xylitol productivities were obtained by the strain overexpressing GRE3 gene, while the control strain showed 7.2 mgg-1 h-1 specific productivity. The recombinant strains carrying XR from C. tropicalis, P. stipitis, and N. crassa produced xylitol with lower specific productivity of 14.3, 6.8, and 6.3 mgg-1 h-1, respectively, than GRE3 overexpressing strain. The glucose fed as cosubstrate was converted to biomass and ethanol, while xylose was only converted to xylitol. The efficiency of ethanol production was in the range of 38-45 % of the theoretical maximum for all the strains. Xylitol production from the non-detoxified corncob hemicellulosic hydrolysate by recombinant S. cerevisiae was reported for the first time. Xylitol productivity was found to be equivalent in the synthetic xylose as well as hemicellulosic hydrolysate-based media showing no inhibition on the S. cerevisiae due to the inhibitors present in the hydrolysate. A systematic evaluation of heterologous XRs and endogenous GRE3 genes was performed, and the strain overexpressing the endogenous GRE3 gene showed the best xylitol productivity.
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Affiliation(s)
- Anushree Kogje
- Department of Technology, Savitribai Phule Pune University, Pune, Maharashtra 411007 India
- Division of Praj Industries Limited, Praj-Matrix - R & D Centre, 402/403/1098, Urawade, Pune, Maharashtra 412115 India
| | - Anand Ghosalkar
- Division of Praj Industries Limited, Praj-Matrix - R & D Centre, 402/403/1098, Urawade, Pune, Maharashtra 412115 India
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Matassa S, Boon N, Pikaar I, Verstraete W. Microbial protein: future sustainable food supply route with low environmental footprint. Microb Biotechnol 2016; 9:568-75. [PMID: 27389856 PMCID: PMC4993174 DOI: 10.1111/1751-7915.12369] [Citation(s) in RCA: 145] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 05/19/2016] [Indexed: 11/28/2022] Open
Abstract
Microbial biotechnology has a long history of producing feeds and foods. The key feature of today's market economy is that protein production by conventional agriculture based food supply chains is becoming a major issue in terms of global environmental pollution such as diffuse nutrient and greenhouse gas emissions, land use and water footprint. Time has come to re‐assess the current potentials of producing protein‐rich feed or food additives in the form of algae, yeasts, fungi and plain bacterial cellular biomass, producible with a lower environmental footprint compared with other plant or animal‐based alternatives. A major driver is the need to no longer disintegrate but rather upgrade a variety of low‐value organic and inorganic side streams in our current non‐cyclic economy. In this context, microbial bioconversions of such valuable matters to nutritive microbial cells and cell components are a powerful asset. The worldwide market of animal protein is of the order of several hundred million tons per year, that of plant protein several billion tons of protein per year; hence, the expansion of the production of microbial protein does not pose disruptive challenges towards the process of the latter. Besides protein as nutritive compounds, also other cellular components such as lipids (single cell oil), polyhydroxybuthyrate, exopolymeric saccharides, carotenoids, ectorines, (pro)vitamins and essential amino acids can be of value for the growing domain of novel nutrition. In order for microbial protein as feed or food to become a major and sustainable alternative, addressing the challenges of creating awareness and achieving public and broader regulatory acceptance are real and need to be addressed with care and expedience.
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Affiliation(s)
- Silvio Matassa
- Center of Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium.,Avecom NV, Industrieweg 122P, 9032, Wondelgem, Belgium
| | - Nico Boon
- Center of Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium
| | - Ilje Pikaar
- The School of Civil Engineering, The University of Queensland, St. Lucia, QLD, 4072, Australia
| | - Willy Verstraete
- Center of Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000, Gent, Belgium.,Avecom NV, Industrieweg 122P, 9032, Wondelgem, Belgium.,KWR Watercycle Research Institute, Post Box 1072, 3430, BB Nieuwegein, The Netherlands
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Clauser NM, Gutiérrez S, Area MC, Felissia FE, Vallejos ME. Small-sized biorefineries as strategy to add value to sugarcane bagasse. Chem Eng Res Des 2016. [DOI: 10.1016/j.cherd.2015.10.050] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Kumar A, Gautam A, Dutt D. Biotechnological Transformation of Lignocellulosic Biomass in to Industrial Products: An Overview. ACTA ACUST UNITED AC 2016. [DOI: 10.4236/abb.2016.73014] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Ray SG, Ghangrekar MM. Biodegradation kinetics of thin-stillage treatment by Aspergillus awamori and characterization of recovered chitosan. Appl Microbiol Biotechnol 2015; 100:1955-1965. [PMID: 26512009 DOI: 10.1007/s00253-015-7080-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 10/05/2015] [Accepted: 10/11/2015] [Indexed: 02/08/2023]
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Bioconversion of Birch Wood Hemicellulose Hydrolyzate to Xylitol. Appl Biochem Biotechnol 2015; 176:947-55. [DOI: 10.1007/s12010-015-1604-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 04/01/2015] [Indexed: 10/23/2022]
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12
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Defosse TA, Melin C, Obando Montoya EJ, Lanoue A, Foureau E, Glévarec G, Oudin A, Simkin AJ, Crèche J, Atehortùa L, Giglioli-Guivarc’h N, Clastre M, Courdavault V, Papon N. A new series of vectors for constitutive, inducible or repressible gene expression in Candida guilliermondii. J Biotechnol 2014; 180:37-42. [DOI: 10.1016/j.jbiotec.2014.03.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Revised: 03/21/2014] [Accepted: 03/26/2014] [Indexed: 12/11/2022]
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Production of pullulan from xylose and hemicellulose hydrolysate by Aureobasidium pullulans AY82 with pH control and DL-dithiothreitol addition. BIOTECHNOL BIOPROC E 2014. [DOI: 10.1007/s12257-013-0715-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Zhang X, P. Nghiem N. Pretreatment and Fractionation of Wheat Straw for Production of Fuel Ethanol and Value-added Co-products in a Biorefinery. AIMS BIOENGINEERING 2014. [DOI: 10.3934/bioeng.2014.1.40] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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15
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Kelloway A, Daoutidis P. Process Synthesis of Biorefineries: Optimization of Biomass Conversion to Fuels and Chemicals. Ind Eng Chem Res 2013. [DOI: 10.1021/ie4018572] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam Kelloway
- Department of Chemical Engineering
and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Prodromos Daoutidis
- Department of Chemical Engineering
and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Enzymatic Fractionation of SAA-Pretreated Barley Straw for Production of Fuel Ethanol and Astaxanthin as a Value-Added Co-Product. Appl Biochem Biotechnol 2013; 171:341-51. [DOI: 10.1007/s12010-013-0374-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 06/27/2013] [Indexed: 10/26/2022]
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17
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Papon N, Savini V, Lanoue A, Simkin AJ, Crèche J, Giglioli-Guivarc'h N, Clastre M, Courdavault V, Sibirny AA. Candida guilliermondii: biotechnological applications, perspectives for biological control, emerging clinical importance and recent advances in genetics. Curr Genet 2013; 59:73-90. [PMID: 23616192 DOI: 10.1007/s00294-013-0391-0] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Revised: 03/28/2013] [Accepted: 04/02/2013] [Indexed: 12/11/2022]
Abstract
Candida guilliermondii (teleomorph Meyerozyma guilliermondii) is an ascomycetous species belonging to the Saccharomycotina CTG clade which has been studied over the last 40 years due to its biotechnological interest, biological control potential and clinical importance. Such a wide range of applications in various areas of fundamental and applied scientific research has progressively made C. guilliermondii an attractive model for exploring the potential of yeast metabolic engineering as well as for elucidating new molecular events supporting pathogenicity and antifungal resistance. All these research fields now take advantage of the establishment of a useful molecular toolbox specifically dedicated to C. guilliermondii genetics including the construction of recipient strains, the development of selectable markers and reporter genes and optimization of transformation protocols. This area of study is further supported by the availability of the complete genome sequence of the reference strain ATCC 6260 and the creation of numerous databases dedicated to gene ontology annotation (metabolic pathways, virulence, and morphogenesis). These genetic tools and genomic resources represent essential prerequisites for further successful development of C. guilliermondii research in medical mycology and in biological control by facilitating the identification of the multiple factors that contribute to its pathogenic potential. These genetic and genomic advances should also expedite future practical uses of C. guilliermondii strains of biotechnological interest by opening a window into a better understanding of the biosynthetic pathways of valuable metabolites.
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Affiliation(s)
- Nicolas Papon
- EA2106, Biomolécules et Biotechnologies Végétales, Faculté de Pharmacie, Université François-Rabelais de Tours, Tours, France.
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Sharma N, Prasad G, Choudhury AR. Utilization of corn steep liquor for biosynthesis of pullulan, an important exopolysaccharide. Carbohydr Polym 2013; 93:95-101. [DOI: 10.1016/j.carbpol.2012.06.059] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2011] [Revised: 05/29/2012] [Accepted: 06/22/2012] [Indexed: 10/28/2022]
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Sugumaran K, Gowthami E, Swathi B, Elakkiya S, Srivastava S, Ravikumar R, Gowdhaman D, Ponnusami V. Production of pullulan by Aureobasidium pullulans from Asian palm kernel: A novel substrate. Carbohydr Polym 2013; 92:697-703. [DOI: 10.1016/j.carbpol.2012.09.062] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 09/14/2012] [Accepted: 09/24/2012] [Indexed: 10/27/2022]
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A TRP5/5-fluoroanthranilic acid counter-selection system for gene disruption in Candida guilliermondii. Curr Genet 2012; 58:245-54. [DOI: 10.1007/s00294-012-0377-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 05/02/2012] [Accepted: 05/06/2012] [Indexed: 10/28/2022]
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Courdavault V, Millerioux Y, Clastre M, Simkin AJ, Marais E, Crèche J, Giglioli-Guivarc’h N, Papon N. Fluorescent protein fusions in Candida guilliermondii. Fungal Genet Biol 2011; 48:1004-11. [DOI: 10.1016/j.fgb.2011.07.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2011] [Revised: 07/12/2011] [Accepted: 07/13/2011] [Indexed: 11/26/2022]
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22
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Conversion of rye straw into fuel and xylitol: a technical and economical assessment based on experimental data. Chem Eng Res Des 2011. [DOI: 10.1016/j.cherd.2010.11.001] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Millerioux Y, Clastre M, Simkin AJ, Courdavault V, Marais E, Sibirny AA, Noël T, Crèche J, Giglioli-Guivarc'h N, Papon N. Drug-resistant cassettes for the efficient transformation of Candida guilliermondii wild-type strains. FEMS Yeast Res 2011; 11:457-63. [DOI: 10.1111/j.1567-1364.2011.00731.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Ananda N, Vadlani PV. Fiber reduction and lipid enrichment in carotenoid-enriched distillers dried grain with solubles produced by secondary fermentation of Phaffia rhodozyma and Sporobolomyces roseus. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2010; 58:12744-12748. [PMID: 21082765 DOI: 10.1021/jf103129t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Carotenoid-enriched distillers dried grain with solubles (DDGS) developed as a value-added animal feed to provide carotenoids from mono and mixed culture (Mx) fermentation of red yeasts Phaffia rhodozyma (PR) and Sporobolomyces roseus (SR) were evaluated for their nutritional composition and compared to the control (C) DDGS. Apart from providing carotenoids, all three fermentation treatments reduced fiber with best reduction of 77% in PR, enhanced crude fat with highest of 81% in Mx, and reduced protein, amino acids and nitrogen by 50% in PR. DDGS fiber reduction by 77% was achieved by P. rhodozyma in the absence of any pretreatment. Qualitative and quantitative differences in fatty acid profiles were seen among the treatments. Vaccenic acid, a monounsaturated fatty acid produced in SR and Mx fermentation, was absent in C and PR. All these nutritional modifications are highly desirable in different DDGS-based animal feeds and can be explored to obtain tailor-made feeds/feed blends for specific animal diets.
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Affiliation(s)
- Nanjundaswamy Ananda
- Bioprocessing and Industrial Value Added Program, Department of Grain Science and Industry, Kansas State University, 202 BIVAP Building, 1980 Kimball Avenue, Manhattan, Kansas 66506, United States.
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Ravella SR, Quiñones TS, Retter A, Heiermann M, Amon T, Hobbs PJ. Extracellular polysaccharide (EPS) production by a novel strain of yeast-like fungus Aureobasidium pullulans. Carbohydr Polym 2010. [DOI: 10.1016/j.carbpol.2010.05.039] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Olstorpe M, Borling J, Schnürer J, Passoth V. Pichia anomala yeast improves feed hygiene during storage of moist crimped barley grain under Swedish farm conditions. Anim Feed Sci Technol 2010. [DOI: 10.1016/j.anifeedsci.2009.12.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Nghiem NP, Montanti J, Johnston D. Production of Astaxanthin from Corn Fiber as a Value-Added Co-product of Fuel Ethanol Fermentation. Appl Biochem Biotechnol 2008; 154:48-58. [DOI: 10.1007/s12010-008-8399-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2008] [Accepted: 10/09/2008] [Indexed: 11/29/2022]
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Lau MW, Dale BE, Balan V. Ethanolic fermentation of hydrolysates from ammonia fiber expansion (AFEX) treated corn stover and distillers grain without detoxification and external nutrient supplementation. Biotechnol Bioeng 2008; 99:529-39. [PMID: 17705225 DOI: 10.1002/bit.21609] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
External nutrient supplementation and detoxification of hydrolysate significantly increase the production cost of cellulosic ethanol. In this study, we investigated the feasibility of fermenting cellulosic hydrolysates without washing, detoxification or external nutrient supplementation using ethanologens Escherichia coli KO11 and the adapted strain ML01 at low initial cell density (16 mg dry weight/L). The cellulosic hydrolysates were derived from enzymatically digested ammonia fiber expansion (AFEX)-treated corn stover and dry distiller's grain and solubles (DDGS) at high solids loading (18% by weight). The adaptation was achieved through selective evolution of KO11 on hydrolysate from AFEX-treated corn stover. All cellulosic hydrolysates tested (36-52 g/L glucose) were fermentable. Regardless of strains, metabolic ethanol yields were near the theoretical limit (0.51 g ethanol/g consumed sugar). Volumetric ethanol productivity of 1.2 g/h/L was achieved in fermentation on DDGS hydrolysate and DDGS improved the fermentability of hydrolysate from corn stover. However, enzymatic hydrolysis and xylose utilization during fermentation were the bottlenecks for ethanol production from corn stover at these experimental conditions. In conclusion, fermentation under the baseline conditions was feasible. Utilization of nutrient-rich feedstocks such as DDGS in fermentation can replace expensive media supplementation.
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Affiliation(s)
- Ming W Lau
- Biomass Conversion Research Lab (BCRL), Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, USA.
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Cardona CA, Sánchez OJ. Fuel ethanol production: process design trends and integration opportunities. BIORESOURCE TECHNOLOGY 2007; 98:2415-57. [PMID: 17336061 DOI: 10.1016/j.biortech.2007.01.002] [Citation(s) in RCA: 319] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2006] [Revised: 01/04/2007] [Accepted: 01/04/2007] [Indexed: 05/11/2023]
Abstract
Current fuel ethanol research and development deals with process engineering trends for improving biotechnological production of ethanol. In this work, the key role that process design plays during the development of cost-effective technologies is recognized through the analysis of major trends in process synthesis, modeling, simulation and optimization related to ethanol production. Main directions in techno-economical evaluation of fuel ethanol processes are described as well as some prospecting configurations. The most promising alternatives for compensating ethanol production costs by the generation of valuable co-products are analyzed. Opportunities for integration of fuel ethanol production processes and their implications are underlined. Main ways of process intensification through reaction-reaction, reaction-separation and separation-separation processes are analyzed in the case of bioethanol production. Some examples of energy integration during ethanol production are also highlighted. Finally, some concluding considerations on current and future research tendencies in fuel ethanol production regarding process design and integration are presented.
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Affiliation(s)
- Carlos A Cardona
- Department of Chemical Engineering, National University of Colombia at Manizales, Cra. 27 No. 64-60 Of. F-505, Manizales, Caldas, Colombia.
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Abstract
Industrial fermentations need raw materials that fulfill the requirements of the organism (suitable carbon and nitrogen source, minerals and specific nutrients) and that are available in a high quantity and quality. This contribution gives a comprehensive overview, including the new trends and progress of recent years. The use of feedstock based on several raw materials such as sugar, starch, inulin and lignocellulose is discussed. Biomass-based raw materials are by far the most applied feedstocks for fermentation. However, there are also raw materials for fermentations derived from the petrochemical industry. These substrates are especially hydrocarbons, alcohols and carboxylic acids. Some applications are given in this chapter.
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Affiliation(s)
- Dietmar Peters
- Fachagentur Nachwachsende Rohstoffe e.V., Hofplatz 1, 18276 Gülzow, Germany.
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Polyhydroxybutyrate production from a novel feedstock derived from a wheat-based biorefinery. Enzyme Microb Technol 2007. [DOI: 10.1016/j.enzmictec.2006.08.002] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Domínguez-Bocanegra AR, Ponce-Noyola T, Torres-Muñoz JA. Astaxanthin production by Phaffia rhodozyma and Haematococcus pluvialis: a comparative study. Appl Microbiol Biotechnol 2007; 75:783-91. [PMID: 17333170 DOI: 10.1007/s00253-007-0889-9] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Revised: 02/09/2007] [Accepted: 02/13/2007] [Indexed: 10/23/2022]
Abstract
Phaffia rhodozyma (now Xanthophyllomyces dendrorhous) and Haematococcus pluvialis are known as the major prominent microorganisms able to synthesize astaxanthin natural pigment. Important research efforts have been made to determine optimal conditions for astaxanthin synthesis. When the focus is on astaxanthin production, the maximal reported value of 9.2 mg/g cell is obtained within H. pluvialis grown on BAR medium, under continuous illumination (345 micromol photon m(-2) s(-1)) and without aeration. Whereas fermentation by mutated R1 yeast grown on coconut milk produced 1,850 microg/g yeast. However, when looking at astaxanthin productivity, the picture is slightly different. The figures obtained with P. rhodozyma are rather similar to those of H. pluvialis. Maximal reported values are 170 microg/g yeast per day with a wild yeast strain and 370 microg/g yeast per day with mutated R1 yeast. In the case of H. pluvialis, maximal values ranged from 290 to 428 microg/g cell per day depending on the media (BG-11 or BAR), light intensity (177 micromol photon m(-2) s(-1)), aeration, etc. The main aim of this work was to examine how astaxanthin synthesis, by P. rhodozyma and H. pluvialis, could be compared. The study is based on previous works by the authors where pigment productions have been reported.
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Affiliation(s)
- A R Domínguez-Bocanegra
- Department of Biotechnology and Bioengineering, CINVESTAV-IPN, Avenida Instituto Politécnico Nacional 2508, Col. Zacatenco, 07300 DF, México, Mexico.
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Xylitol production in a bubble column bioreactor: Influence of the aeration rate and immobilized system concentration. Process Biochem 2007. [DOI: 10.1016/j.procbio.2006.07.010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Rao RS, Jyothi CP, Prakasham RS, Sarma PN, Rao LV. Xylitol production from corn fiber and sugarcane bagasse hydrolysates by Candida tropicalis. BIORESOURCE TECHNOLOGY 2006; 97:1974-8. [PMID: 16242318 DOI: 10.1016/j.biortech.2005.08.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2004] [Revised: 08/11/2005] [Accepted: 08/17/2005] [Indexed: 05/04/2023]
Abstract
A natural isolate, Candida tropicalis was tested for xylitol production from corn fiber and sugarcane bagasse hydrolysates. Fermentation of corn fiber and sugarcane bagasse hydrolysate showed xylose uptake and xylitol production, though these were very low, even after hydrolysate neutralization and treatments with activated charcoal and ion exchange resins. Initial xylitol production was found to be 0.43 g/g and 0.45 g/g of xylose utilised with corn fiber and sugarcane bagasse hydrolysate respectively. One of the critical factors for low xylitol production was the presence of inhibitors in these hydrolysates. To simulate influence of hemicellulosic sugar composition on xylitol yield, three different combinations of mixed sugar control experiments, without the presence of any inhibitors, have been performed and the strain produced 0.63 g/g, 0.68 g/g and 0.72 g/g of xylose respectively. To improve yeast growth and xylitol production with these hydrolysates, which contain inhibitors, the cells were adapted by sub culturing in the hydrolysate containing medium for 25 cycles. After adaptation the organism produced more xylitol 0.58 g/g and 0.65 g/g of xylose with corn fiber hydrolysate and sugarcane bagasse hydrolysate respectively.
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Affiliation(s)
- R Sreenivas Rao
- Department of Microbiology, Osmania University, Hyderabad, India
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Abstract
Biomass accumulated by the photosynthetic fixation of carbon dioxide is the only renewable carbon source, and hence, the only renewable raw material for the chemical industry. Carbohydrates are the main constituents of biomass and occur as cell wall and storage carbohydrates, transportation carbohydrates and glycoconjugates. Cellulose, hemicelluloses and starch in particular as well as pectin, inulin and saccharose to a smaller extent are the most abundant carbohydrates. Glucose is the most important monosaccharide and monomer of polysaccharides in natural carbohydrates. Thus, it is the most abundant organic compound on earth. Production of pulp from wood cellulose, applications of starch for paper making as well as uses of glucose and saccharose for fermentation are the most important chemical and technical uses of carbohydrates. Carbohydrates used as fermentation feedstock are essential for the chemical industry. Their importance is steadily growing due to the increasing implementation of biotechnological processes.
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Affiliation(s)
- Dietmar Peters
- Fachagentur Nachwachsende Rohstoffe eV, Gülzow, Germany.
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Numan MT, Bhosle NB. Alpha-L-arabinofuranosidases: the potential applications in biotechnology. J Ind Microbiol Biotechnol 2005; 33:247-60. [PMID: 16385399 DOI: 10.1007/s10295-005-0072-1] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2005] [Accepted: 12/13/2005] [Indexed: 10/25/2022]
Abstract
Recently, alpha-L-arabinofuranosidases (EC3.2.1.55) have received increased attention primarily due to their role in the degradation of lignocelluloses as well as their positive effect on the activity of other enzymes acting on lignocelluloses. As a result, these enzymes are used in many biotechnological applications including wine industry, clarification of fruit juices, digestion enhancement of animal feedstuffs and as a natural improver for bread. Moreover, these enzymes could be used to improve existing technologies and to develop new technologies. The production, mechanisms of action, classification, synergistic role, biochemical properties, substrate specificities, molecular biology and biotechnological applications of these enzymes have been reviewed in this article.
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Affiliation(s)
- Mondher Th Numan
- National Institute Of Oceanography, 403004 Dona Poula, Goa, India.
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Santos JC, Converti A, de Carvalho W, Mussatto SI, da Silva SS. Influence of aeration rate and carrier concentration on xylitol production from sugarcane bagasse hydrolyzate in immobilized-cell fluidized bed reactor. Process Biochem 2005. [DOI: 10.1016/j.procbio.2003.11.045] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mussatto SI, Roberto IC. Optimal experimental condition for hemicellulosic hydrolyzate treatment with activated charcoal for xylitol production. Biotechnol Prog 2004; 20:134-9. [PMID: 14763835 DOI: 10.1021/bp034207i] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Rice straw was hydrolyzed into a mixture of sugars using diluted H(2)SO(4). During hydrolysis, a variety of inhibitors was also produced, including acetic acid, furfural, hydroxymethylfurfural, and lignin degradation products (several aromatic and phenolic compounds). To reduce the toxic compounds concentration in the hydrolyzate and to improve the xylitol yield and volumetric productivity, rice straw hemicellulosic hydrolyzate was treated with activated charcoal under different pH values, stirring rates, contact times, and temperatures, employing a 2(4) full-factorial design. Fermentative assays were conducted with treated hydrolyzates containing 90 g/L xylose. The results indicated that temperature, pH, and stirring rate strongly influenced the hydrolyzate treatment, temperature and pH interfering with all of the responses analyzed (removal of color and lignin degradation products, xylitol yield factor, and volumetric productivity). The combination of pH 2.0, 150 rpm, 45 degrees C, and 60 min was considered an optimal condition, providing significant removal rates of color (48.9%) and lignin degradation products (25.8%), as well as a xylitol production of 66 g/L, a volumetric productivity of 0.57 g/L.h, and a yield factor of 0.72 g/g.
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Affiliation(s)
- Solange I Mussatto
- Department of Biotechnology, Faculty of Chemical Engineering of Lorena, Rodovia Itajubá-Lorena Km 74.5, 12600-970 Lorena, SP, Brazil.
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41
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Current awareness on yeast. Yeast 2003; 20:1007-14. [PMID: 14587515 DOI: 10.1002/yea.948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
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42
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Functional genetics of industrial yeasts; of ancient skills and modern applications. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/3-540-37003-x_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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