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Repeated-batch simultaneous saccharification and fermentation of cassava pulp for ethanol production using amylases and Saccharomyces cerevisiae immobilized on bacterial cellulose. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2021.108258] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Wongsirichot P, Muanruksa P, Kaewkannetra P, Winterburn J. Comprehensive optimization of tropical biomass hydrolysis for nitrogen-limited medium-chain polyhydroxyalkanoate synthesis. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 128:221-231. [PMID: 34000692 DOI: 10.1016/j.wasman.2021.04.062] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/19/2021] [Accepted: 04/30/2021] [Indexed: 06/12/2023]
Abstract
Expanding the use of tropical biomass wastes for nitrogen-limited fermentation was investigated, specifically, the production of medium chain length polyhydroxyalkanoates. Comprehensive central composite design was conducted to assess pH, temperature, biomass solid loading, cellulase loading and amylase loading and their impact on the hydrolysis of palm, coconut and cassava wastes. Glucose yields of 33.3, 31.7 and 79.0% wt. with respect to total glucose were found for palm, coconut and cassava, respectively. Importantly, the impact on the total nitrogen derived during enzymatic hydrolysis of these tropical biomass was described for the first time. The level of nitrogen needs to be properly controlled as high nitrogen would result in low carbon to nitrogen ratio leading to low polyhydroxyalkanoates accumulation, but low nitrogen would hinder growth of the biopolymer producer. Maximum hydrolysate nitrogen, were 1.80, 1.55 and 0.871 g/l for palm, coconut and cassava, respectively. Using the surface responses, biomass media designed for high carbon-to-nitrogen were produced and validated using Pseudomonas putida. Low glucose-carbon to nitrogen were found for palm and coconut after scale-up, leading to the majority of their polyhydroxyalkanoates not being biomass-derived. However, cassava-derived biopolymers were successfully accumulated at 9.01 and 7.13% wt. for total medium chain length polyhydroxyalkanoates and 10-carbon polyhydroxyalkanoates, respectively. This study provides an important foundation for the expansion of tropical biomass wastes for biopolymer production and other nitrogen-limited applications in general.
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Affiliation(s)
- Phavit Wongsirichot
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Papasanee Muanruksa
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom; Department of Biotechnology, Faculty of Technology, Khon Kaen University, Mitraphap Road, Meuang, Khon kaen 40002, Thailand
| | - Pakawadee Kaewkannetra
- Department of Biotechnology, Faculty of Technology, Khon Kaen University, Mitraphap Road, Meuang, Khon kaen 40002, Thailand
| | - James Winterburn
- Department of Chemical Engineering and Analytical Science, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom.
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Singh N, Mathur AS, Gupta RP, Barrow CJ, Tuli DK, Puri M. Enzyme systems of thermophilic anaerobic bacteria for lignocellulosic biomass conversion. Int J Biol Macromol 2020; 168:572-590. [PMID: 33309672 DOI: 10.1016/j.ijbiomac.2020.12.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 11/17/2022]
Abstract
Economic production of lignocellulose degrading enzymes for biofuel industries is of considerable interest to the biotechnology community. While these enzymes are widely distributed in fungi, their industrial production from other sources, particularly by thermophilic anaerobic bacteria (growth Topt ≥ 60 °C), is an emerging field. Thermophilic anaerobic bacteria produce a large number of lignocellulolytic enzymes having unique structural features and employ different schemes for biomass degradation, which can be classified into four systems namely; 'free enzyme system', 'cell anchored enzymes', 'complex cellulosome system', and 'multifunctional multimodular enzyme system'. Such enzymes exhibit high specific activity and have a natural ability to withstand harsh bioprocessing conditions. However, achieving a higher production of these thermostable enzymes at current bioprocessing targets is challenging. In this review, the research opportunities for these distinct enzyme systems in the biofuel industry and the associated technological challenges are discussed. The current status of research findings is highlighted along with a detailed description of the categorization of the different enzyme production schemes. It is anticipated that high temperature-based bioprocessing will become an integral part of sustainable bioenergy production in the near future.
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Affiliation(s)
- Nisha Singh
- Centre for Chemistry and Biotechnology, Deakin University, Waurn Ponds, Victoria 3217, Australia; DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad 121007, India
| | - Anshu S Mathur
- DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad 121007, India
| | - Ravi P Gupta
- DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad 121007, India
| | - Colin J Barrow
- Centre for Chemistry and Biotechnology, Deakin University, Waurn Ponds, Victoria 3217, Australia
| | - Deepak K Tuli
- DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad 121007, India
| | - Munish Puri
- Centre for Chemistry and Biotechnology, Deakin University, Waurn Ponds, Victoria 3217, Australia; Medical Biotechnology, Centre for Marine Bioproducts Development, College of Medicine and Public Health, Flinders University, Bedford Park, Adelaide 5042, Australia.
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Cheawchanlertfa P, Sutheeworapong S, Jenjaroenpun P, Wongsurawat T, Nookaew I, Cheevadhanarak S, Kosugi A, Pason P, Waeonukul R, Ratanakhanokchai K, Tachaapaikoon C. Clostridium manihotivorum sp. nov., a novel mesophilic anaerobic bacterium that produces cassava pulp-degrading enzymes. PeerJ 2020; 8:e10343. [PMID: 33240652 PMCID: PMC7676355 DOI: 10.7717/peerj.10343] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 10/20/2020] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Cassava pulp is a promising starch-based biomasses, which consists of residual starch granules entrapped in plant cell wall containing non-starch polysaccharides, cellulose and hemicellulose. Strain CT4T, a novel mesophilic anaerobic bacterium isolated from soil collected from a cassava pulp landfill, has a strong ability to degrade polysaccharides in cassava pulp. This study explored a rarely described species within the genus Clostridium that possessed a group of cassava pulp-degrading enzymes. METHODS A novel mesophilic anaerobic bacterium, the strain CT4T, was identified based on phylogenetic, genomic, phenotypic and chemotaxonomic analysis. The complete genome of the strain CT4T was obtained following whole-genome sequencing, assembly and annotation using both Illumina and Oxford Nanopore Technology (ONT) platforms. RESULTS Analysis based on the 16S rRNA gene sequence indicated that strain CT4T is a species of genus Clostridium. Analysis of the whole-genome average amino acid identity (AAI) of strain CT4T and the other 665 closely related species of the genus Clostridium revealed a separated strain CT4T from the others. The results revealed that the genome consisted of a 6.3 Mb circular chromosome with 5,664 protein-coding sequences. Genome analysis result of strain CT4T revealed that it contained a set of genes encoding amylolytic-, hemicellulolytic-, cellulolytic- and pectinolytic enzymes. A comparative genomic analysis of strain CT4T with closely related species with available genomic information, C. amylolyticum SW408T, showed that strain CT4T contained more genes encoding cassava pulp-degrading enzymes, which comprised a complex mixture of amylolytic-, hemicellulolytic-, cellulolytic- and pectinolytic enzymes. This work presents the potential for saccharification of strain CT4T in the utilization of cassava pulp. Based on phylogenetic, genomic, phenotypic and chemotaxonomic data, we propose a novel species for which the name Clostridium manihotivorum sp. nov. is suggested, with the type strain CT4T (= TBRC 11758T = NBRC 114534T).
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Affiliation(s)
- Pattsarun Cheawchanlertfa
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Sawannee Sutheeworapong
- Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Piroon Jenjaroenpun
- Division of Bioinformatics and Data Management for Research, Department of Research and Development, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Thidathip Wongsurawat
- Division of Bioinformatics and Data Management for Research, Department of Research and Development, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
- Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Intawat Nookaew
- Department of Biomedical Informatics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
- Department of Physiology and Biophysics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
| | - Supapon Cheevadhanarak
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
- Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Akihiko Kosugi
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences, Ibaraki, Japan
| | - Patthra Pason
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
- Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Rattiya Waeonukul
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
- Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Khanok Ratanakhanokchai
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
| | - Chakrit Tachaapaikoon
- School of Bioresources and Technology, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
- Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
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Hu B, Zhu M. Reconstitution of cellulosome: Research progress and its application in biorefinery. Biotechnol Appl Biochem 2019; 66:720-730. [DOI: 10.1002/bab.1804] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 08/03/2019] [Indexed: 09/01/2023]
Affiliation(s)
- Bin‐Bin Hu
- Guangdong Provincial Engineering and Technology Research Center of Biopharmaceuticals School of Biology and Biological Engineering South China University of Technology, Guangzhou Higher Education Mega Center Panyu Guangzhou People's Republic of China
- Yunnan Academy of Tobacco Agricultural Sciences Kunming People's Republic of China
- State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou People's Republic of China
| | - Ming‐Jun Zhu
- Guangdong Provincial Engineering and Technology Research Center of Biopharmaceuticals School of Biology and Biological Engineering South China University of Technology, Guangzhou Higher Education Mega Center Panyu Guangzhou People's Republic of China
- State Key Laboratory of Pulp and Paper Engineering South China University of Technology Guangzhou People's Republic of China
- College of Life and Geographic Sciences Kashi University Kashi People's Republic of China
- The Key Laboratory of Ecology and Biological Resources in Yarkand Oasis at Colleges & Universities under the Department of Education of Xinjiang Uygur Autonomous Region Kashi University Kashi People's Republic of China
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Process Optimization for Dietary Fiber Production from Cassava Pulp Using Acid Treatment. ACTA UNIVERSITATIS CIBINIENSIS. SERIES E: FOOD TECHNOLOGY 2019. [DOI: 10.2478/aucft-2018-0009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Cassava pulp, the side product of tapioca industry consists of starch and fiber as the major component. Acid treatment was employed in the conversion process of cassava pulp into dietary fiber to remove the starch component, to increase fiber content, and to modify the structure of fiber. This study purposed to obtain optimum process conditions (acid concentration, temperature, and reaction time) in the production of dietary fiber from cassava pulp. Process optimization was conducted using Response Surface Methodology (RSM) for maximizing Total Dietary Fiber (TDF), Water Holding Capacity (WHC) and Oil Holding Capacity (OHC) as the responses. The optimum process was gained at 6% H2SO4 concentration, 127°C, and 45 mins. Prediction values of TDF, WHC, and OHC were 100%, 10.47 g/g, and 3.60 g/g, respectively. Validation was carried out and resulted in TDF 96.95%, WHC 10.47 g/g, and OHC 3.55 g/g. Physicochemical properties of the resulting dietary fiber were significantly improved. The fiber structure has modified which characterized by the changes in morphology and crystallinity.
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Rempel A, Machado T, Treichel H, Colla E, Margarites AC, Colla LM. Saccharification of Spirulina platensis biomass using free and immobilized amylolytic enzymes. BIORESOURCE TECHNOLOGY 2018; 263:163-171. [PMID: 29738979 DOI: 10.1016/j.biortech.2018.04.114] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 04/27/2018] [Accepted: 04/28/2018] [Indexed: 06/08/2023]
Abstract
We aimed to use physical methods of microalgal biomass rupture to study saccharification strategies using free and immobilized amylolytic enzymes. The biomass of Spirulina platensis, which consists of 50-60% carbohydrates, was exposed to physical cell rupture treatments, with better results obtained using freeze/thaw cycles following by gelatinization. In saccharification tests, it was possible to hydrolyze Spirulina biomass with hydrolysis efficiencies above 99% and 83%, respectively, using 1% (v/v) of free enzymes or 1% (m/v) of amylolytic enzymes immobilized together. The use of free and immobilized enzymes yielded high levels of conversion of polysaccharides to simple sugars in Spirulina biomass, showing that these processes are promising for the advancement of bioethanol production using microalgal biomass.
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Affiliation(s)
- Alan Rempel
- Graduation in Civil and Environmental Engineering, University of Passo Fundo (UPF), Campus I, km 171, BR 285, P.O. Box 611, 99001-970 Passo Fundo, Rio Grande do Sul, Brazil
| | - Tainara Machado
- Food Engineering Course, University of Passo Fundo (UPF), Campus I, km 171, BR 285, P.O. Box 611, 99001-970 Passo Fundo, Rio Grande do Sul, Brazil
| | - Helen Treichel
- Graduation in Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil
| | - Eliane Colla
- Graduation in Food Technology, Federal Technological University of Paraná (UTFPR), Av. Brasil, 4232, 85884-000, P.O. Box 271, Medianeira, Paraná, Brazil
| | - Ana Cláudia Margarites
- Graduation in Civil and Environmental Engineering, University of Passo Fundo (UPF), Campus I, km 171, BR 285, P.O. Box 611, 99001-970 Passo Fundo, Rio Grande do Sul, Brazil
| | - Luciane Maria Colla
- Graduation in Civil and Environmental Engineering, University of Passo Fundo (UPF), Campus I, km 171, BR 285, P.O. Box 611, 99001-970 Passo Fundo, Rio Grande do Sul, Brazil.
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Apiwatanapiwat W, Vaithanomsat P, Thanapase W, Ratanakhanokchai K, Kosugi A. Xylan supplement improves 1,3-propanediol fermentation by Clostridium butyricum. J Biosci Bioeng 2018. [PMID: 29534944 DOI: 10.1016/j.jbiosc.2017.12.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Lignocellulosic biomass as co-substrate enhances the 1,3-propanediol (1,3-PD) production of anaerobic fermenters by increasing their conversion yield from glycerol. To improve 1,3-propanediol (1,3-PD) production by this efficient approach, Clostridium butyricum I5-42 was supplemented with lignocellulosic biomasses (starch free fiber (CPF) from cassava pulp and xylan) as co-substrates. The 1,3-PD production and growth of C. butyricum were considerably higher in glycerol plus CPF and xylan than in glycerol alone, whereas another major polysaccharide (cellulose co-substrate) failed to improve the 1,3-PD production. C. butyricum I5-42 showed no degradation ability on cellulose powder, and only weak activity and slight growth on xylan. However CPF supplemented with xylan strongly enhanced the transcription levels of the major enzymes of 1,3-PD production (glycerol dehydratase, 1,3-propanediol dehydrogenase, and glycerol dehydrogenase). The intracellular redox reactions maintained equal balance in the supplemented media, suggesting that CPF plus xylan promotes 1,3-PD production in the reductive pathway. This promotion is probably mediated by NADH, which is effectively regenerated by small amounts of released oligosaccharides and subsequent activation of the glycerol oxidative pathway. Both supplements also improved the 1,3-PD production at high glycerol concentration. Therefore, supplementation with lignocellulolytic polysaccharides such as xylan can improve the production and productivity of 1,3-PD from glycerol in C. butyricum. Direct supplementation of CPF with xylan in 1,3-PD production has not been previously reported.
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Affiliation(s)
- Waraporn Apiwatanapiwat
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand
| | - Pilanee Vaithanomsat
- Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand; Center for Advanced Studies in Tropical Natural Resources, National Research University-Kasetsart University (CASTNAR, NRU-KU), Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand
| | - Warunee Thanapase
- Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand
| | - Khanok Ratanakhanokchai
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkuntien, Bangkok 10150, Thailand
| | - Akihiko Kosugi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Biological Resources and Post-Harvest Division, Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan.
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Apiwatanapiwat W, Vaithanomsat P, Tachaapaikoon C, Ratanakhanokchai K, Kosugi A. Effect of cassava pulp supplement on 1,3-propanediol production by Clostridium butyricum. J Biotechnol 2016; 230:44-6. [PMID: 27184427 DOI: 10.1016/j.jbiotec.2016.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 05/06/2016] [Accepted: 05/12/2016] [Indexed: 11/24/2022]
Abstract
To improve its 1,3-propanediol (1,3-PD) production, Clostridium butyricum was cultivated on glycerol medium supplemented with cassava pulp (CP). At small concentrations, the CP improved the 1,3-PD productivity of C. butyricum from (0.25±0.01)g/L/h (glycerol alone) to (0.43±0.02)g/L/h (glycerol+2g/L CP) after 24h fermentation.
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Affiliation(s)
- Waraporn Apiwatanapiwat
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand
| | - Pilanee Vaithanomsat
- Kasetsart Agricultural and Agro-Industrial Product Improvement Institute, Kasetsart University, 50 Chatuchak, Bangkok 10900, Thailand
| | - Chakrit Tachaapaikoon
- Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkuntien Bangkok 10150, Thailand
| | - Khanok Ratanakhanokchai
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkuntien, Bangkok 10150, Thailand
| | - Akihiko Kosugi
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences, 1-1 Ohwashi, Tsukuba, Ibaraki 305-8686, Japan.
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Expression of novel glucose tolerant β-glucosidase on cell surface by Rhodotorula glutinis isolate. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2015. [DOI: 10.1016/j.bcab.2015.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Prasertwasu S, Khumsupan D, Komolwanich T, Chaisuwan T, Luengnaruemitchai A, Wongkasemjit S. Efficient process for ethanol production from Thai Mission grass (Pennisetum polystachion). BIORESOURCE TECHNOLOGY 2014; 163:152-159. [PMID: 24811442 DOI: 10.1016/j.biortech.2014.04.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 04/11/2014] [Accepted: 04/12/2014] [Indexed: 06/03/2023]
Abstract
Mission grass (Pennisetum polystachion) obtained from Tak Province, Thailand, possesses the potential to become a lignocellulosic biomass for bioethanol production. After the grass underwent milling and alkaline pretreatments, it was subjected to acid and enzymatic hydrolysis. The glucose hydrolyzate from the grass was detoxified to remove inhibitory compounds and degradation products such as furfural and 5-hydroxymethylfurfural. Overliming at pH 10 produced the highest ethanol yield. Among various strains of baker's yeasts, Saccharomyces cerevisiae TISTR 5596 with a yeast concentration of 10% v/v produced the maximum ethanol yield at 16 g/L within 24h, which is among one of the fastest ethanol producing microorganisms compared to other strains of S. cerevisiae as well as other ethanol-producing microorganisms.
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Affiliation(s)
- Sirirat Prasertwasu
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand
| | - Darin Khumsupan
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand
| | - Tidarat Komolwanich
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand
| | - Thanyalak Chaisuwan
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand
| | - Apanee Luengnaruemitchai
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand
| | - Sujitra Wongkasemjit
- The Petroleum and Petrochemical College and Center of Excellence for Petrochemical and Materials Technology, Chulalongkorn University, Bangkok 10330, Thailand.
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