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Kumar S, Agarwal GP, Sreekrishnan TR. Optimization of co-culture condition with respect to aeration and glucose to xylose ratio for bioethanol production. INDIAN CHEMICAL ENGINEER 2023. [DOI: 10.1080/00194506.2023.2190332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
Affiliation(s)
- Shashi Kumar
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, New Delhi, India
| | - G. P. Agarwal
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, New Delhi, India
| | - T. R. Sreekrishnan
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, New Delhi, India
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Naseeruddin S, Desai S, Venkateswar Rao L. Co-culture of Saccharomyces cerevisiae (VS3) and Pichia stipitis (NCIM 3498) enhances bioethanol yield from concentrated Prosopis juliflora hydrolysate. 3 Biotech 2021; 11:21. [PMID: 33442519 PMCID: PMC7779385 DOI: 10.1007/s13205-020-02595-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 12/12/2020] [Indexed: 10/22/2022] Open
Abstract
Biphasic acid hydrolysates and enzymatic hydrolysates from carbohydrate-rich Prosopis juliflora, an invasive perennial deciduous shrub of semi-arid regions, were used for bioethanol production. Saccharomyces cerevisiae and Pichia stipitis were used for fermentation of hexoses and pentoses. P. juliflora acid hydrolysate with an initial sugar concentration of 18.70 ± 0.16 g/L was concentrated to 33.59 ± 0.52 g/L by vacuum distillation. The concentrated hydrolysate was pretreated and fermented by mono- and co-culture methods either singly or in combination with enzyme hydrolysate and ethanol yields were compared. Monoculture with S. cerevisiae (VS3) and S. cerevisiae (NCIM3455) yielded maximum ethanol of 36.6 ± 1.83 g/L and 37.1 ± 1.86 g/L with a fermentation efficiency of 83.94 ± 4.20% and 84.20 ± 4.21%, respectively, after 36 h of fermentation. The ethanol yield obtained was 0.428 ± 0.02 g/g substrate and 0.429 ± 0.02 g/g substrate with a productivity of 1.017 ± 0.051 g/L/hand 1.031 ± 0.052 g/L/h, respectively. P. stipitis (NCIM3498) yielded maximum ethanol of 24 g/L with ethanol yield of 0.455 ± 0.02 g/g substrate and a productivity of 1.004 ± 0.050 g/L/h after 24 h of fermentation. With concentrated acid hydrolysate as substrate, S. cerevisiae (VS3) produced ethanol of 8.52 ± 0.43 g/L, whereas S. cerevisiae (NCIM3455) produced 5.96 ± 0.30 g/L of ethanol. P.stipitis (NCIM3498) produced 4.52 ± 0.23 g/L of ethanol by utilizing 14.66 ± 0.87 g/L of sugars. Co-culture with S. cerevisiae (VS3) addition after 18 h of addition of P. stipitis (NCIM3498) to the mixture of concentrated acid hydrolysate and enzyme hydrolysate produced 13.86 ± 0.47 g/L of ethanol with fermentation efficiency, ethanol yield and productivity of 87.54 ± 0.54%, 0.446 ± 2.36 g/g substrate and 0.385 ± 0.014 g/L/h, respectively. Hence, it is concluded that co-culture with S. cerevisiae and P. stipitis is feasible, further scaling up of fermentation of P. juliflora substrate for bioethanol production.
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Affiliation(s)
- Shaik Naseeruddin
- Research Scholar and Professor Emeritus, Respectively, Department of Microbiology, Osmania University, Hyderabad, 500007 India
| | - Suseelendra Desai
- Principal Scientist, ICAR-Central Research Institute for Dry Land Agriculture, Santoshnagar, Hyderabad, 500059 India
| | - L. Venkateswar Rao
- Research Scholar and Professor Emeritus, Respectively, Department of Microbiology, Osmania University, Hyderabad, 500007 India
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Use of an (Hemi) Cellulolytic Enzymatic Extract Produced by Aspergilli Species Consortium in the Saccharification of Biomass Sorghum. Appl Biochem Biotechnol 2019; 189:37-48. [DOI: 10.1007/s12010-019-02991-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Accepted: 03/01/2019] [Indexed: 10/27/2022]
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Sanjivkumar M, Silambarasan T, Balagurunathan R, Immanuel G. Biosynthesis, molecular modeling and statistical optimization of xylanase from a mangrove associated actinobacterium Streptomyces variabilis (MAB3) using Box-Behnken design with its bioconversion efficacy. Int J Biol Macromol 2018; 118:195-208. [PMID: 29909037 DOI: 10.1016/j.ijbiomac.2018.06.063] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/31/2018] [Accepted: 06/12/2018] [Indexed: 11/16/2022]
Abstract
The present study was undertaken to evaluate the biosynthesis, molecular modeling and statistical optimization of xylanase production through Box-Behnken design by a mangrove associated actinobacterium Streptomyces variabilis (MAB3). Initially, the production of xylanase by the selected strain was carried through submerged fermentation using birchwood xylan as substrate. Further the xylanase production was statistically optimized through Box-Behnken design. It showed 5.30 fold increase of xylanase production by the isolate compared to 'one factor at a time approach' in the presence of the basal medium containing birchwood xylan (2.0% w/v) at pH 8.2, temperature 46.5 °C, inoculum size of 2% for 68 h. The analysis of variance (ANOVA) revealed high coefficient of determination (R2 = 0.9490) for the respective responses at significant level (P < 0.0001). The xylanase was purified by different purification steps and it resulted 5.30 fold increase with the yield of 21.27% at the final step using sephadex G-75 chromatography. The molecular weight of the purified xylanase was observed as 50 kDa on 10% SDS-PAGE. The homology 3D structure of the purified xylanase protein was predicted and this protein encodes with 420 amino acid residues. The maximum activity of purified xylanase was observed at pH 8, temperature 40 °C and the production medium supplemented with 1 mM Ca2+ metal ion, 2.0% xylan and 1.5% NaCl. The kinetic parameters of the purified xylanase expressed the Km and Vmax values of 5.23 mg/ml and 152.07 μg/min/mg, respectively. Finally, the xylanolytic hydrolysis of pretreated agro-residues, especially the rice straw substituted medium yielded maximum (46.28 mg/g) level of reducing sugar and saccharification (63.18%), followed by bioethanol production (3.92 g/l) at 72 h of incubation. Based on the results, it could be confirmed that the selected isolate is a potent strain for xylanase production and also it can able to convert the pretreated agro-residues into economically important byproduct like bioethanol.
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Affiliation(s)
- Muthusamy Sanjivkumar
- MNP laboratory, Centre for Marine Science and Technology, Manonmaniam Sundaranar University, Rajakamangalam 629502, India
| | | | | | - Grasian Immanuel
- MNP laboratory, Centre for Marine Science and Technology, Manonmaniam Sundaranar University, Rajakamangalam 629502, India.
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Nosrati-Ghods N, Harrison STL, Isafiade AJ, Tai SL. Ethanol from Biomass Hydrolysates by Efficient Fermentation of Glucose and Xylose - A Review. CHEMBIOENG REVIEWS 2018. [DOI: 10.1002/cben.201800009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Nosaibeh Nosrati-Ghods
- University of Cape Town; Faculty of Engineering and the Built Environment; Department of Chemical Engineering; Private Bag 7701 Rondebosch South Africa
| | - Susan T. L. Harrison
- University of Cape Town; Faculty of Engineering and the Built Environment; Department of Chemical Engineering; Private Bag 7701 Rondebosch South Africa
| | - Adeniyi J. Isafiade
- University of Cape Town; Faculty of Engineering and the Built Environment; Department of Chemical Engineering; Private Bag 7701 Rondebosch South Africa
| | - Siew L. Tai
- University of Cape Town; Faculty of Engineering and the Built Environment; Department of Chemical Engineering; Private Bag 7701 Rondebosch South Africa
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Ntaikou I, Menis N, Alexandropoulou M, Antonopoulou G, Lyberatos G. Valorization of kitchen biowaste for ethanol production via simultaneous saccharification and fermentation using co-cultures of the yeasts Saccharomyces cerevisiae and Pichia stipitis. BIORESOURCE TECHNOLOGY 2018; 263:75-83. [PMID: 29730521 DOI: 10.1016/j.biortech.2018.04.109] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 04/26/2018] [Accepted: 04/27/2018] [Indexed: 06/08/2023]
Abstract
The biotransformation of the pre-dried and shredded organic fraction of kitchen waste to ethanol was investigated, via co-cultures of the yeasts Saccharomyces cerevisiae and Pichia stipitis (Scheffersomyces stipitis). Preliminary experiments with synthetic media were performed, in order to investigate the effect of different operational parameters on the ethanol production efficiency of the co-culture. The control of the pH and the supplementation with organic nitrogen were shown to be key factors for the optimization of the process. Subsequently, the ethanol production efficiency from the waste was assessed via simultaneous saccharification and fermentation experiments. Different loadings of cellulolytic enzymes and mixtures of cellulolytic with amylolytic enzymatic blends were tested in order to enhance the substrate conversion efficiency. It was further shown that for solids loading up to 40% waste on dry mass basis, corresponding to 170 g.L-1 initial concentration of carbohydrates, no substrate inhibition occurred, and ethanol concentration up to 45 g.L-1 was achieved.
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Affiliation(s)
- Ioanna Ntaikou
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece; School of Chemical Engineering, National Technical University of Athens, Zografou Campus, GR 15780 Athens, Greece.
| | - Nikolaos Menis
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece
| | - Maria Alexandropoulou
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece; School of Chemical Engineering, National Technical University of Athens, Zografou Campus, GR 15780 Athens, Greece
| | - Georgia Antonopoulou
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece; School of Chemical Engineering, National Technical University of Athens, Zografou Campus, GR 15780 Athens, Greece
| | - Gerasimos Lyberatos
- Institute of Chemical Engineering Sciences, Foundation for Research and Technology, GR 26504 Patra, Greece; School of Chemical Engineering, National Technical University of Athens, Zografou Campus, GR 15780 Athens, Greece
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Dey P, Pal P, Kevin JD, Das DB. Lignocellulosic bioethanol production: prospects of emerging membrane technologies to improve the process – a critical review. REV CHEM ENG 2018. [DOI: 10.1515/revce-2018-0014] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
To meet the worldwide rapid growth of industrialization and population, the demand for the production of bioethanol as an alternative green biofuel is gaining significant prominence. The bioethanol production process is still considered one of the largest energy-consuming processes and is challenging due to the limited effectiveness of conventional pretreatment processes, saccharification processes, and extreme use of electricity in common fermentation and purification processes. Thus, it became necessary to improve the bioethanol production process through reduced energy requirements. Membrane-based separation technologies have already gained attention due to their reduced energy requirements, investment in lower labor costs, lower space requirements, and wide flexibility in operations. For the selective conversion of biomasses to bioethanol, membrane bioreactors are specifically well suited. Advanced membrane-integrated processes can effectively contribute to different stages of bioethanol production processes, including enzymatic saccharification, concentrating feed solutions for fermentation, improving pretreatment processes, and finally purification processes. Advanced membrane-integrated simultaneous saccharification, filtration, and fermentation strategies consisting of ultrafiltration-based enzyme recycle system with nanofiltration-based high-density cell recycle fermentation system or the combination of high-density cell recycle fermentation system with membrane pervaporation or distillation can definitely contribute to the development of the most efficient and economically sustainable second-generation bioethanol production process.
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Affiliation(s)
- Pinaki Dey
- Department of Biotechnology , Karunya Institute of Technology and Sciences , Karunya Nagar Coimbatore 641114 , India
| | - Parimal Pal
- Department of Chemical Engineering , National Institute of Technology , Durgapur , India
| | - Joseph Dilip Kevin
- Department of Biotechnology , Karunya Institute of Technology and Sciences , Coimbatore , India
| | - Diganta Bhusan Das
- Department of Chemical Engineering, School of AACME , Loughborough University , Loughborough, Leicestershire , UK
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Sotthisawad K, Mahakhan P, Vichitphan K, Vichitphan S, Sawaengkaew J. Bioconversion of Mushroom Cultivation Waste Materials into Cellulolytic Enzymes and Bioethanol. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2017. [DOI: 10.1007/s13369-017-2496-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Kim M, Liang M, He Q, Wang J. A novel bioreactor to study the dynamics of co-culture systems. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2015.11.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Velmurugan R, Incharoensakdi A. Proper ultrasound treatment increases ethanol production from simultaneous saccharification and fermentation of sugarcane bagasse. RSC Adv 2016. [DOI: 10.1039/c6ra17792a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To improve the saccharification and fermentation processes, proper ultrasound was applied which resulted in the presence of cellulase complex with improved β-glucosidase ratio leading to enhanced overall ethanol yield.
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Toquero C, Bolado S. Effect of four pretreatments on enzymatic hydrolysis and ethanol fermentation of wheat straw. Influence of inhibitors and washing. BIORESOURCE TECHNOLOGY 2014; 157:68-76. [PMID: 24531149 DOI: 10.1016/j.biortech.2014.01.090] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 01/18/2014] [Accepted: 01/21/2014] [Indexed: 05/16/2023]
Abstract
Pretreatment is essential in the production of alcohol from lignocellulosic material. In order to increase enzymatic sugar release and bioethanol production, thermal, dilute acid, dilute basic and alkaline peroxide pretreatments were applied to wheat straw. Compositional changes in pretreated solid fractions and sugars and possible inhibitory compounds released in liquid fractions were analysed. SEM analysis showed structural changes after pretreatments. Enzymatic hydrolysis and fermentation by Pichia stipitis of unwashed and washed samples from each pretreatment were performed so as to compare sugar and ethanol yields. The effect of the main inhibitors found in hydrolysates (formic acid, acetic acid, 5-hydroxymethylfurfural and furfural) was first studied through ethanol fermentations of model media and then compared to real hydrolysates. Hydrolysates of washed alkaline peroxide pretreated biomass provided the highest sugar concentrations, 31.82g/L glucose, and 13.75g/L xylose, their fermentation yielding promising results, with ethanol concentrations reaching 17.37g/L.
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Affiliation(s)
- Cristina Toquero
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Silvia Bolado
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
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Karagöz P, Özkan M. Ethanol production from wheat straw by Saccharomyces cerevisiae and Scheffersomyces stipitis co-culture in batch and continuous system. BIORESOURCE TECHNOLOGY 2014; 158:286-93. [PMID: 24614063 DOI: 10.1016/j.biortech.2014.02.022] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2013] [Revised: 02/06/2014] [Accepted: 02/08/2014] [Indexed: 05/25/2023]
Abstract
In this research, Scheffersomyces stipitis and Saccharomyces cerevisiae in immobilized and suspended state were used to convert pentose and hexose sugars to ethanol. In batch and continuous systems, S. stipitis and S. cerevisiae co-culture performance was better than S. cerevisiae. Continuous ethanol production was performed in packed bed immobilized cell reactor (ICR). In ICR, S. stipitis cells were found to be more sensitive to oxygen concentration and other possible mass transfer limitations as compared to S. cerevisiae. Use of co-immobilized S. stipitis and S. cerevisiae resulted in maximum xylose consumption (73.92%) and 41.68 g/L day ethanol was produced at HRT (hydraulic retention time) of 6h with wheat straw hydrolysate. At HRT of 0.75 h, the highest amount of ethanol with the values of 356.21 and 235.43 g/L day was produced when synthetic medium and wheat straw hydrolysate were used as feeding medium in ICR, respectively.
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Affiliation(s)
- Pınar Karagöz
- Department of Environmental Engineering, Gebze Institute of Technology, 41400 Gebze, Kocaeli, Turkey
| | - Melek Özkan
- Department of Environmental Engineering, Gebze Institute of Technology, 41400 Gebze, Kocaeli, Turkey.
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Singh LK, Majumder CB, Ghosh S. Development of sequential-co-culture system (Pichia stipitis and Zymomonas mobilis) for bioethanol production from Kans grass biomass. Biochem Eng J 2014. [DOI: 10.1016/j.bej.2013.10.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hanly TJ, Henson MA. Dynamic model-based analysis of furfural and HMF detoxification by pure and mixed batch cultures of S. cerevisiae and S. stipitis. Biotechnol Bioeng 2013; 111:272-84. [PMID: 23983023 DOI: 10.1002/bit.25101] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 08/13/2013] [Accepted: 08/15/2013] [Indexed: 01/16/2023]
Abstract
Inhibitory compounds that result from biomass hydrolysis are an obstacle to the efficient production of second-generation biofuels. Fermentative microorganisms can reduce compounds such as furfural and 5-hydroxymethyl furfural (HMF), but detoxification is accompanied by reduced growth rates and ethanol yields. In this study, we assess the effects of these furan aldehydes on pure and mixed yeast cultures consisting of a respiratory deficient mutant of Saccharomyces cerevisiae and wild-type Scheffersomyces stipitis using dynamic flux balance analysis. Uptake kinetics and stoichiometric equations for the intracellular reduction reactions associated with each inhibitor were added to genome-scale metabolic reconstructions of the two yeasts. Further modification of the S. cerevisiae metabolic network was necessary to satisfactorily predict the amount of acetate synthesized during HMF reduction. Inhibitory terms that captured the adverse effects of the furan aldehydes and their corresponding alcohols on cell growth and ethanol production were added to attain qualitative agreement with batch experiments conducted for model development and validation. When the two yeasts were co-cultured in the presence of the furan aldehydes, inoculums that reduced the synthesis of highly toxic acetate produced by S. cerevisiae yielded the highest ethanol productivities. The model described here can be used to generate optimal fermentation strategies for the simultaneous detoxification and fermentation of lignocellulosic hydrolysates by S. cerevisiae and/or S. stipitis.
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Affiliation(s)
- Timothy J Hanly
- Department of Chemical Engineering, University of Massachusetts, Goessmann Lab 159, 686 N. Pleasant St., Amherst, Massachusetts, 01003-3110
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Dhabhai R, Chaurasia SP, Singh K, Dalai AK. Kinetics of Bioethanol Production Employing Mono- and Co-Cultures ofSaccharomyces cerevisiaeandPichia stipitis. Chem Eng Technol 2013. [DOI: 10.1002/ceat.201300092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Dhabhai R, Chaurasia SP, Dalai AK. EFFECT OF PRETREATMENT CONDITIONS ON STRUCTURAL CHARACTERISTICS OF WHEAT STRAW. CHEM ENG COMMUN 2013. [DOI: 10.1080/00986445.2012.743895] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Hickert LR, de Souza-Cruz PB, Rosa CA, Ayub MAZ. Simultaneous saccharification and co-fermentation of un-detoxified rice hull hydrolysate by Saccharomyces cerevisiae ICV D254 and Spathaspora arborariae NRRL Y-48658 for the production of ethanol and xylitol. BIORESOURCE TECHNOLOGY 2013; 143:112-116. [PMID: 23792660 DOI: 10.1016/j.biortech.2013.05.123] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 05/29/2013] [Accepted: 05/30/2013] [Indexed: 06/02/2023]
Abstract
Co-fermentation and simultaneous saccharification of rice hull hydrolysate (RHH) were investigated for the production of ethanol and xylitol by Saccharomyces cerevisiae, Spathaspora arborariae, or the combination of both. In bioreactor cultures under oxygen limitation, S. cerevisiae was capable of metabolizing glucose from RHH, which contained small amounts of acetic acid, furfural, and hydroxymethylfurfural, achieving ethanol yields of 0.45 and concentrations of 10.5 g L(-1). In the co-culture of S. cerevisiae and S. arborariae pentoses and hexoses from RHH, were converted to ethanol and xylitol, with yields of 0.48 and 0.39, and concentrations of 11 g L(-1) and 3 g L(-1), respectively. The simultaneous saccharification and co-fermentation using both yeasts produced ethanol and xylitol to final concentrations of 14.5 g L(-1) and 3 g L(-1), respectively. Results showed good prospects to use co-cultures of S. cerevisiae and S. arborariae for the bioconversion of RHH into ethanol and xylitol without further detoxification.
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Affiliation(s)
- Lilian Raquel Hickert
- Biotechnology & Biochemical Engineering Laboratory (BiotecLab), Federal University of Rio Grande do Sul, Av. Bento Gonçalves 9500, P.O. Box 15090, ZC 91501-970 Porto Alegre, RS, Brazil
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Hickert LR, da Cunha-Pereira F, de Souza-Cruz PB, Rosa CA, Ayub MAZ. Ethanogenic fermentation of co-cultures of Candida shehatae HM 52.2 and Saccharomyces cerevisiae ICV D254 in synthetic medium and rice hull hydrolysate. BIORESOURCE TECHNOLOGY 2013; 131:508-514. [PMID: 23391739 DOI: 10.1016/j.biortech.2012.12.135] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 12/18/2012] [Accepted: 12/19/2012] [Indexed: 06/01/2023]
Abstract
The ability of Candida shehatae, Saccharomyces cerevisiae, or the combination of these two yeasts in converting the mixed sugar composition of rice hull hydrolysate (RHH) as substrate for ethanol production is presented. In shake flask experiments, co-cultures showed ethanol yields (YP/S) of 0.42 and 0.51 in synthetic medium simulating the sugar composition of RHH and in RHH, respectively, with both glucose and xylose being completely depleted, while pure cultures of C. shehatae produced slightly lower ethanol yields (0.40). Experiments were scaled-up to bioreactors, in which anaerobiosis and oxygen limitation conditions were tested. Bioreactor co-cultures produced similar ethanol yields in both conditions (0.50-0.51) in synthetic medium, while in RHH, yields of 0.48 and 0.44 were obtained, respectively. The results showed near-theoretical yields of ethanol. Results suggest the feasibility of co-cultures of C. shehatae, a newly isolated strain, and S. cerevisiae in RHH as substrate for second-generation ethanol production.
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Affiliation(s)
- Lilian Raquel Hickert
- Biotechnology & Biochemical Engineering Laboratory (BiotecLab), Federal University of Rio Grande do Sul, Av., Bento Gonçalves, 9500, P.O. Box 15090, ZC 91501-970, Porto Alegre, RS, Brazil
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Chandel AK, Antunes FFA, Anjos V, Bell MJV, Rodrigues LN, Singh OV, Rosa CA, Pagnocca FC, da Silva SS. Ultra-structural mapping of sugarcane bagasse after oxalic acid fiber expansion (OAFEX) and ethanol production by Candida shehatae and Saccharomyces cerevisiae. BIOTECHNOLOGY FOR BIOFUELS 2013; 6:4. [PMID: 23324164 PMCID: PMC3614376 DOI: 10.1186/1754-6834-6-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 01/08/2013] [Indexed: 05/05/2023]
Abstract
BACKGROUND Diminishing supplies of fossil fuels and oil spills are rousing to explore the alternative sources of energy that can be produced from non-food/feed-based substrates. Due to its abundance, sugarcane bagasse (SB) could be a model substrate for the second-generation biofuel cellulosic ethanol. However, the efficient bioconversion of SB remains a challenge for the commercial production of cellulosic ethanol. We hypothesized that oxalic-acid-mediated thermochemical pretreatment (OAFEX) would overcome the native recalcitrance of SB by enhancing the cellulase amenability toward the embedded cellulosic microfibrils. RESULTS OAFEX treatment revealed the solubilization of hemicellulose releasing sugars (12.56 g/l xylose and 1.85 g/l glucose), leaving cellulignin in an accessible form for enzymatic hydrolysis. The highest hydrolytic efficiency (66.51%) of cellulignin was achieved by enzymatic hydrolysis (Celluclast 1.5 L and Novozym 188). The ultrastructure characterization of SB using scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy, Fourier transform-near infrared spectroscopy (FT-NIR), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) revealed structural differences before and after OAFEX treatment with enzymatic hydrolysis. Furthermore, fermentation mediated by C. shehatae UFMG HM52.2 and S. cerevisiae 174 showed fuel ethanol production from detoxified acid (3.2 g/l, yield 0.353 g/g; 0.52 g/l, yield, 0.246 g/g) and enzymatic hydrolysates (4.83 g/l, yield, 0.28 g/g; 6.6 g/l, yield 0.46 g/g). CONCLUSIONS OAFEX treatment revealed marked hemicellulose degradation, improving the cellulases' ability to access the cellulignin and release fermentable sugars from the pretreated substrate. The ultrastructure of SB after OAFEX and enzymatic hydrolysis of cellulignin established thorough insights at the molecular level.
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Affiliation(s)
- Anuj K Chandel
- Department of Biotechnology, University of São Paulo, School of
Engineering of Lorena, Estrada Municipal do Campinho- Caixa,, Postal 116
12.602.810, Lorena/SP, Brazil
| | - Felipe F A Antunes
- Department of Biotechnology, University of São Paulo, School of
Engineering of Lorena, Estrada Municipal do Campinho- Caixa,, Postal 116
12.602.810, Lorena/SP, Brazil
| | - Virgilio Anjos
- Material Spectroscopy Laboratory, Department of Physics, Federal University
of Juiz de Fora,, 36036-330, Juiz de Fora, MG, Brazil
| | - Maria J V Bell
- Material Spectroscopy Laboratory, Department of Physics, Federal University
of Juiz de Fora,, 36036-330, Juiz de Fora, MG, Brazil
| | - Leonarde N Rodrigues
- Material Spectroscopy Laboratory, Department of Physics, Federal University
of Juiz de Fora,, 36036-330, Juiz de Fora, MG, Brazil
| | - Om V Singh
- Division of Biological and Health Sciences, University of Pittsburgh, 16701,
Bradford, PA, USA
| | - Carlos A Rosa
- Department of Microbiology, Federal University of Minas Gerais,, Belo
Horizonte, MG, Brazil
| | - Fernando C Pagnocca
- Department of Biochemistry and Microbiology, Institute of Biosciences
CEIS/UNESP – Rio, Claro/ SP, Brazil
| | - Silvio S da Silva
- Department of Biotechnology, University of São Paulo, School of
Engineering of Lorena, Estrada Municipal do Campinho- Caixa,, Postal 116
12.602.810, Lorena/SP, Brazil
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Eiadpum A, Limtong S, Phisalaphong M. High-temperature ethanol fermentation by immobilized coculture of Kluyveromyces marxianus and Saccharomyces cerevisiae. J Biosci Bioeng 2012; 114:325-9. [PMID: 22608995 DOI: 10.1016/j.jbiosc.2012.04.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 03/30/2012] [Accepted: 04/03/2012] [Indexed: 10/28/2022]
Abstract
Suspended and immobilized cocultures of the thermotolerant yeast, Kluyveromyces marxianus DMKU 3-1042 and the mesophilic flocculent yeast, Saccharomyces cerevisiae M30 were studied for their abilities to improve production and stability of ethanol fermentation. Sugarcane juice and blackstrap molasses, at initial sugar concentrations of 220 g/L, were used as carbon sources. The results indicated that the coculture system could improve ethanol production from both sugarcane juice and blackstrap molasses when the operating temperature ranged between 33 °C and 45 °C. High temperature tolerances were achieved when the coculture was immobilized. The immobilized coculture was more effective in high-temperature ethanol fermentation than the suspended cultures. The coculture immobilized on thin-shell silk cocoon and fermented at 37 °C and 40 °C generated maximal ethanol concentrations of 81.4 and 77.3 g/L, respectively, which were 5.9-8.7% and 16.8-39.0% higher than those of the suspended cultures, respectively.
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Affiliation(s)
- Akekasit Eiadpum
- Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
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