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Li J, Xia Y, Wei B, Shen W, Yang H, Chen X. Metabolic engineering of Candida tropicalis for efficient 1,2,4-butanetriol production. Biochem Biophys Res Commun 2024; 710:149876. [PMID: 38579537 DOI: 10.1016/j.bbrc.2024.149876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2024] [Accepted: 03/31/2024] [Indexed: 04/07/2024]
Abstract
1,2,4-Butanetriol serves as a precursor in the manufacture of diverse pharmaceuticals and the energetic plasticizer 1,2,4-butanetriol trinitrate. The study involved further modifications to an engineered Candida tropicalis strain, aimed at improving the production efficiency of 1,2,4-butanetriol. Faced with the issue of xylonate accumulation due to the low activity of heterologous xylonate dehydratase, we modulated iron metabolism at the transcriptional level to boost intracellular iron ion availability, thus enhancing the enzyme activity by 2.2-fold. Addressing the NADPH shortfall encountered during 1,2,4-butanetriol biosynthesis, we overexpressed pivotal genes in the NADPH regeneration pathway, achieving a 1,2,4-butanetriol yield of 3.2 g/L. The introduction of calcium carbonate to maintain pH balance led to an increased yield of 4 g/L, marking a 111% improvement over the baseline strain. Finally, the use of corncob hydrolysate as a substrate culminated in 1,2,4-butanetriol production of 3.42 g/L, thereby identifying a novel host for the conversion of corncob hydrolysate to 1,2,4-butanetriol.
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Affiliation(s)
- Jingyun Li
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yuanyuan Xia
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Bo Wei
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Wei Shen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Haiquan Yang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Xianzhong Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, & School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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2
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Zhang Z, Ai F, Li Y, Zhu S, Wu Q, Duan Z, Liu H, Qian L, Zhang Q, Zhang Y. Co-production process optimization and carbon footprint analysis of biohydrogen and biofertilizer from corncob by photo-fermentation. BIORESOURCE TECHNOLOGY 2023; 375:128814. [PMID: 36868428 DOI: 10.1016/j.biortech.2023.128814] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Revised: 02/24/2023] [Accepted: 02/25/2023] [Indexed: 06/18/2023]
Abstract
In this study, corncob was taken as substrate, the co-production process of biohydrogen and biofertilizer by photo-fermentation was investigated and its carbon footprint analysis was conducted to evaluate the carbon transfer pathway. Biohydrogen was produced by photo-fermentation, and the hydrogen producing residues were immobilized by sodium alginate. Cumulative hydrogen yield (CHY) and nitrogen release ability (NRA) was taken as references, and the effect of substrate particle size on the co-production process was evaluated. Results showed that due to the porous adsorption properties, corncob size of 120 mesh was the optimal one. Under that condition, the highest CHY and NRA were 71.16 mL/g TS and 68.76%, respectively. The carbon footprint analysis indicted that 7.9% carbon element was released as carbon dioxide, 78.3% carbon element was immobilized in the biofertilizer, and 13.8% carbon element was lost. This work is significant of the biomass utilization and clean energy production.
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Affiliation(s)
- Zhiping Zhang
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Fuke Ai
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Yameng Li
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Shengnan Zhu
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Qiyou Wu
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Zhisai Duan
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Hanchuan Liu
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Liyang Qian
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Quanguo Zhang
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China
| | - Yang Zhang
- Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou 450002, China.
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Efficient Corncob Biorefinery for Ethanol Initiated by a Novel Pretreatment of Densifying Lignocellulosic Biomass with Sulfuric Acid. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation8110661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Corncob is a potential feedstock for biorefineries to produce cellulosic ethanol and other chemicals. Densifying lignocellulosic biomass with chemicals followed by autoclave (DLCA) has been confirmed an efficient and economical pretreatment method, and it was applied in the present work for conversion of corncob to bioethanol. The dosage of sulfuric acid, solid loading of biomass, and autoclave time for pretreatment were investigated. Enzymatic hydrolysis at 25–35% solids loadings resulted in 91–97% sugar conversions. Fermentation of the resulted hydrolysates went well with the highest ethanol titer reaching 75.71 g/L at 35% solid loading. Simultaneous saccharification and co-fermentation was applied to further improve xylose consumption at high solids loadings and the ethanol titer was enhanced to 82.0 g/L at 35% solid loading with an ethanol yield of 21.67 kg/100 kg corncob. This study demonstrated DLCA provided a highly digestible and highly fermentable corncob for biorefinery.
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Lima CS, Neitzel T, Pirolla R, Dos Santos LV, Lenczak JL, Roberto IC, Rocha GJM. Metabolomic profiling of Spathaspora passalidarum fermentations reveals mechanisms that overcome hemicellulose hydrolysate inhibitors. Appl Microbiol Biotechnol 2022; 106:4075-4089. [PMID: 35622124 DOI: 10.1007/s00253-022-11987-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 04/21/2022] [Accepted: 05/17/2022] [Indexed: 11/30/2022]
Abstract
Understanding the mechanisms involved in tolerance to inhibitors is the first step in developing robust yeasts for industrial second-generation ethanol (E2G) production. Here, we used ultra-high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) and MetaboAnalyst 4.0 for analysis of MS data to examine the changes in the metabolic profile of the yeast Spathaspora passalidarum during early fermentation of hemicellulosic hydrolysates containing high or low levels of inhibitors (referred to as control hydrolysate or CH and strategy hydrolysate or SH, respectively). During fermentation of SH, the maximum ethanol production was 16 g L-1 with a yield of 0.28 g g-1 and productivity of 0.22 g L-1 h-1, whereas maximum ethanol production in CH fermentation was 1.74 g L-1 with a yield of 0.11 g g-1 and productivity of 0.01 g L-1 h-1. The high level of inhibitors in CH induced complex physiological and biochemical responses related to stress tolerance in S. passalidarum. This yeast converted compounds with aldehyde groups (hydroxymethylfurfural, furfural, 4-hydroxybenzaldehyde, syringaldehyde, and vanillin) into less toxic compounds, and inhibitors were found to reduce cell viability and ethanol production. Intracellularly, high levels of inhibitors altered the energy homeostasis and redox balance, resulting in lower levels of ATP and NADPH, while that of glycolytic, pentose phosphate, and tricarboxylic acid (TCA) cycle pathways were the most affected, being the catabolism of glucogenic amino acids, the main cellular response to inhibitor-induced stress. This metabolomic investigation reveals interesting targets for metabolic engineering of ethanologenic yeast strains tolerant against multiple inhibitors for E2G production. KEY POINTS: • Inhibitors in the hydrolysates affected the yeast's redox balance and energy status. • Inhibitors altered the glycolytic, pentose phosphate, TCA cycle and amino acid pathways. • S. passalidarum converted aldehyde groups into less toxic compounds.
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Affiliation(s)
- Cleilton Santos Lima
- Department of Biotechnology, Engineering College of Lorena, University of São Paulo (USP), Estrada Municipal Do Campinho, s/n, Campinho, Lorena, SP, 12602-810, Brazil. .,Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Rua Giuseppe Máximo Scolfaro 10.000, Campinas, SP, 13083-100, Brazil.
| | - Thiago Neitzel
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Rua Giuseppe Máximo Scolfaro 10.000, Campinas, SP, 13083-100, Brazil.,Program in Bioenergy, Faculty of Food Engineering, State University of Campinas (UNICAMP), Rua Monteiro Lobato 80, Campinas, SP, 13083-862, Brazil
| | - Renan Pirolla
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Rua Giuseppe Máximo Scolfaro 10.000, Campinas, SP, 13083-100, Brazil
| | - Leandro Vieira Dos Santos
- Senai Innovation Institute for Biotechnology, São Paulo, SP, 01130-000, Brazil.,Genetics and Molecular Biology Graduate Program, Institute of Biology, State University of Campinas (UNICAMP), Rua Monteiro Lobato 255, Campinas, 13083-862, Brazil
| | - Jaciane Lutz Lenczak
- Department of Chemical Engineering and Food Engineering, University Campus - CTC, Federal University of Santa Catarina (UFSC), R. Do Biotério Central, Córrego Grande, s/n Florianópolis, SC, 88040-900, Brazil
| | - Inês Conceição Roberto
- Department of Biotechnology, Engineering College of Lorena, University of São Paulo (USP), Estrada Municipal Do Campinho, s/n, Campinho, Lorena, SP, 12602-810, Brazil
| | - George J M Rocha
- Department of Biotechnology, Engineering College of Lorena, University of São Paulo (USP), Estrada Municipal Do Campinho, s/n, Campinho, Lorena, SP, 12602-810, Brazil. .,Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Rua Giuseppe Máximo Scolfaro 10.000, Campinas, SP, 13083-100, Brazil.
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Arciszewski J, Auclair K. Mechanoenzymatic Reactions Involving Polymeric Substrates or Products. CHEMSUSCHEM 2022; 15:e202102084. [PMID: 35104019 DOI: 10.1002/cssc.202102084] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 01/31/2022] [Indexed: 06/14/2023]
Abstract
Mechanoenzymology is an emerging field in which mechanical mixing is used to sustain enzymatic reactions in low-solvent or solvent-free mixtures. Many enzymes have been reported that thrive under such conditions. Considering the central role of biopolymers and synthetic polymers in our society, this minireview highlights the use of mechanoenzymology for the synthesis or depolymerization of oligomeric or polymeric materials. In contrast to traditional in-solution reactions, solvent-free mechanoenzymology has the advantages of avoiding solubility issues, proceeding in a minimal volume, and reducing solvent waste while potentially improving the reaction efficiency and accessing new reactivity. It is expected that this strategy will continue to gain popularity and find more applications.
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Affiliation(s)
- Jane Arciszewski
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, H3A 0B8, Canada
| | - Karine Auclair
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, H3A 0B8, Canada
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Raj T, Chandrasekhar K, Naresh Kumar A, Rajesh Banu J, Yoon JJ, Kant Bhatia S, Yang YH, Varjani S, Kim SH. Recent advances in commercial biorefineries for lignocellulosic ethanol production: Current status, challenges and future perspectives. BIORESOURCE TECHNOLOGY 2022; 344:126292. [PMID: 34748984 DOI: 10.1016/j.biortech.2021.126292] [Citation(s) in RCA: 47] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/29/2021] [Accepted: 11/01/2021] [Indexed: 05/26/2023]
Abstract
Cellulosic ethanol production has received global attention to use as transportation fuels with gasoline blending virtue of carbon benefits and decarbonization. However, due to changing feedstock composition, natural resistance, and a lack of cost-effective pretreatment and downstream processing, contemporary cellulosic ethanol biorefineries are facing major sustainability issues. As a result, we've outlined the global status of present cellulosic ethanol facilities, as well as main roadblocks and technical challenges for sustainable and commercial cellulosic ethanol production. Additionally, the article highlights the technical and non-technical barriers, various R&D advancements in biomass pretreatment, enzymatic hydrolysis, fermentation strategies that have been deliberated for low-cost sustainable fuel ethanol. Moreover, selection of a low-cost efficient pretreatment method, process simulation, unit integration, state-of-the-art in one pot saccharification and fermentation, system microbiology/ genetic engineering for robust strain development, and comprehensive techno-economic analysis are all major bottlenecks that must be considered for long-term ethanol production in the transportation sector.
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Affiliation(s)
- Tirath Raj
- School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - K Chandrasekhar
- School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - A Naresh Kumar
- Department of Environmental Science and Technology, University of Maryland, College Park, MD 20742, USA
| | - J Rajesh Banu
- Department of Life Sciences, Central University of Tamil Nadu, Thiruvarur 610 005, India
| | - Jeong-Jun Yoon
- Green and Sustainable Materials R&D Department, Korea Institute of Industrial Technology (KITECH), Cheonan-si, Chungcheongnam-do 31056, Republic of Korea
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | - Yung-Hun Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | - Sunita Varjani
- Gujarat Pollution Control Board, Gandhinagar, Gujarat 382 010, India
| | - Sang-Hyoun Kim
- School of Civil and Environmental Engineering, Yonsei University, Seoul 03722, Republic of Korea.
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7
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Srivastava N, Srivastava M, Alhazmi A, Kausar T, Haque S, Singh R, Ramteke PW, Mishra PK, Tuohy M, Leitgeb M, Gupta VK. Technological advances for improving fungal cellulase production from fruit wastes for bioenergy application: A review. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 287:117370. [PMID: 34020262 DOI: 10.1016/j.envpol.2021.117370] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 04/12/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
Fruit wastes can be imperative to elevate economical biomass to biofuels production process at pilot scale. Because of the renewable features, huge availability, having low lignin content organic nature and low cost; these wastes can be of much interest for cellulase enzyme production. This review provides recent advances on the fungal cellulase production using fruit wastes as a potential substrate. Also, the availability of fruit wastes, generation and processing data and their potential applications for cellulase enzyme production have been discussed. Several aspects, including cellulase and its function, solid-state fermentation, process parameters, microbial source, and the application of enzyme in biofuels industries have also been discussed. Further, emphasis has been made on various bottlenecks and feasible approaches such as use of nanomaterials, co-culture, molecular techniques, genetic engineering, and cost economy analysis to develop a low-cost based comprehensive technology for viable production of cellulase and its application in biofuels production technology.
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Affiliation(s)
- Neha Srivastava
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India.
| | - Manish Srivastava
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India
| | - Alaa Alhazmi
- Medical Laboratory Technology Department, Jazan University, Jazan, Saudi Arabia; SMIRES for Consultation in Specialized Medical Laboratories, Jazan University, Jazan, Saudi Arabia
| | - Tahreem Kausar
- Department of Food Technology, School of Interdisciplinary Science and Technology, Jamia Hamdard, Hamdard Nagar, New Delhi, 110062, India
| | - Shafiul Haque
- Research and Scientific Studies Unit, College of Nursing and Allied Health Sciences, Jazan University, Jazan, 45142, Saudi Arabia
| | - Rajeev Singh
- Department of Environmental Studies, Satyawati College, University of Delhi, Delhi, 110052, India
| | - Pramod W Ramteke
- Department of Biological Sciences, Sam Higginbottom University of Agriculture Technology & Sciences (Formerly Allahabad Agricultural Institute) Allahabad, 221007, Uttar Pradesh, India; Department of Life Sciences, Mandsaur University, Mandsaur, 458001, India
| | - Pradeep Kumar Mishra
- Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, 221005, India
| | - Maria Tuohy
- Molecular Glycobiotechnology Group, Department of Biochemistry, National University of Ireland Galway, Galway, Ireland
| | - Maja Leitgeb
- Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanovaulica 17, 2000, Maribor, Slovenija
| | - Vijai Kumar Gupta
- Biorefining and Advanced Materials Research Center, Scotland's Rural College (SRUC), Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK; Center for Safe and Improved Food, Scotland's Rural College (SRUC), Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK.
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Martinez-Jimenez F, de Arruda Ribeiro MP, Sargo CR, Ienczak JL, Morais ER, da Costa AC. Dynamic Modeling Application To Evaluate the Performance of Spathaspora passalidarum in Second-Generation Ethanol Production: Parametric Dynamics and the Likelihood Confidence Region. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02299] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Fernan Martinez-Jimenez
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo 13083-852, Brazil
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-970, Brazil
| | | | - Cintia Regina Sargo
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-970, Brazil
| | - Jaciane Lutz Ienczak
- Chemical Engineering and Food Engineering Department, Santa Catarina Federal University, Florianópolis, Santa Catarina 88040-900, Brazil
| | - Edvaldo Rodrigo Morais
- Brazilian Biorenewables National Laboratory (LNBR), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, São Paulo 13083-970, Brazil
| | - Aline Carvalho da Costa
- School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo 13083-852, Brazil
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Cellulosic Bioethanol from Industrial Eucalyptus globulus Bark Residues Using Kraft Pulping as a Pretreatment. ENERGIES 2021. [DOI: 10.3390/en14082185] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The pulp and paper industry faces an emerging challenge for valorising wastes and side-streams generated according to the biorefinery concept. Eucalyptus globulus bark, an abundant industrial residue in the Portuguese pulp and paper sector, has a high potential to be converted into biobased products instead of being burned. This work aimed to evaluate the ethanol production from E. globulus bark previously submitted to kraft pulping through separate hydrolysis and fermentation (SHF) configuration. Fed-batch enzymatic hydrolysis provided a concentrated hydrolysate with 161.6 g·L−1 of cellulosic sugars. S. cerevisiae and Ethanol Red® strains demonstrated a very good fermentation performance, despite a negligible xylose consumption. S. passalidarum, a yeast known for its capability to consume pentoses, was studied in a simultaneous co-culture with Ethanol Red®. However, bioethanol production was not improved. The best fermentation performance was achieved by Ethanol Red®, which provided a maximum ethanol concentration near 50 g·L−1 and fermentation efficiency of 80%. Concluding, kraft pulp from E. globulus bark showed a high potential to be converted into cellulosic bioethanol, being susceptible to implementing an integrated biorefinery on the pulp and paper industrial plants.
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Cai X, Hu CH, Wang J, Zeng XH, Luo JX, Li M, Liu ZQ, Zheng YG. Efficient high-solids enzymatic hydrolysis of corncobs by an acidic pretreatment and a fed-batch feeding mode. BIORESOURCE TECHNOLOGY 2021; 326:124768. [PMID: 33529982 DOI: 10.1016/j.biortech.2021.124768] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Corncob is an abundant and renewable resource that could be enzymatically hydrolyzed to fermentable sugar. A major impediment in corncob utilization is the low hydrolysis efficiency at high-solids content. This study attempted different pretreatment methods and fed-batch modes to achieve a 25% solids content hydrolysis with high yields. Natural corncobs were compared with acid-treated and acid-alkali-treated corncobs in terms of kinetics parameters, conversion rate and glucose titer. By feeding in batches, a "low amount and high frequency" mode (10%-3%-3%-3%-3%-3%, every 5 h) was confirmed to be optimal for a 25% high-solids hydrolysis system with a cellulase loading of 12 mg/g (7.3 FPU/g), resulted with an 84.4% glucose yield at 96 h. Our results demonstrated that combination of both optimized pretreatment method and fed-batch mode were a favored process model for high-solids hydrolysis of lignocellulose, boosting cellulose hydrolysis efficiency and sugar yields on an industrial scale.
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Affiliation(s)
- Xue Cai
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China; Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Chang-Hui Hu
- Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Jing Wang
- Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Xu-Hao Zeng
- Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Jia-Xing Luo
- Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Mian Li
- Zhejiang Huakang Pharmaceutical Co., Ltd, 18 Huagong Road, Huabu Town, Kaihua County, Quzhou, Zhejiang 324302, People's Republic of China
| | - Zhi-Qiang Liu
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
| | - Yu-Guo Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China
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Enhanced Tolerance of Spathaspora passalidarum to Sugarcane Bagasse Hydrolysate for Ethanol Production from Xylose. Appl Biochem Biotechnol 2021; 193:2182-2197. [PMID: 33682050 DOI: 10.1007/s12010-021-03544-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 02/26/2021] [Indexed: 10/22/2022]
Abstract
During the pretreatment and hydrolysis of lignocellulosic biomass to obtain a hydrolysate rich in fermentable sugars, furaldehydes (furfural and hydroxymethylfurfural), phenolic compounds, and organic acids are formed and released. These compounds inhibit yeast metabolism, reducing fermentation yields and productivity. This study initially confirmed the ability of Spathaspora passalidarum to ferment xylose and demonstrated its sensibility to the inhibitors present in the hemicellulosic sugarcane bagasse hydrolysate. Then, an adaptive laboratory evolution, with progressive increments of hydrolysate concentration, was employed to select a strain more resistant to hydrolysate inhibitors. Afterward, a central composite design was performed to maximize ethanol production using hydrolysate as substrate. At optimized conditions (initial cell concentration of 30 g/L), S. passalidarum was able to produce 19.4 g/L of ethanol with productivity, yield, and xylose consumption rate of 0.8 g/L.h and 0.4 g/g, respectively, in a sugarcane bagasse hemicellulosic hydrolysate. A kinetic model was developed to describe the inhibition of fermentation by substrate and product. The values obtained for substrate saturation and inhibition constant were Ks = 120.4 g/L and Ki = 1293.4 g/L. Ethanol concentration that stops cell growth was 30.1 g/L. There was an agreement between simulated and experimental results, with a residual standard deviation lower than 6%.
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The Xylose Metabolizing Yeast Spathaspora passalidarum is a Promising Genetic Treasure for Improving Bioethanol Production. FERMENTATION-BASEL 2020. [DOI: 10.3390/fermentation6010033] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Currently, the fermentation technology for recycling agriculture waste for generation of alternative renewable biofuels is getting more and more attention because of the environmental merits of biofuels for decreasing the rapid rise of greenhouse gas effects compared to petrochemical, keeping in mind the increase of petrol cost and the exhaustion of limited petroleum resources. One of widely used biofuels is bioethanol, and the use of yeasts for commercial fermentation of cellulosic and hemicellulosic agricultural biomasses is one of the growing biotechnological trends for bioethanol production. Effective fermentation and assimilation of xylose, the major pentose sugar element of plant cell walls and the second most abundant carbohydrate, is a bottleneck step towards a robust biofuel production from agricultural waste materials. Hence, several attempts were implemented to engineer the conventional Saccharomyces cerevisiae yeast to transport and ferment xylose because naturally it does not use xylose, using genetic materials of Pichia stipitis, the pioneer native xylose fermenting yeast. Recently, the nonconventional yeast Spathaspora passalidarum appeared as a founder member of a new small group of yeasts that, like Pichia stipitis, can utilize and ferment xylose. Therefore, the understanding of the molecular mechanisms regulating the xylose assimilation in such pentose fermenting yeasts will enable us to eliminate the obstacles in the biofuels pipeline, and to develop industrial strains by means of genetic engineering to increase the availability of renewable biofuel products from agricultural biomass. In this review, we will highlight the recent advances in the field of native xylose metabolizing yeasts, with special emphasis on S. passalidarum for improving bioethanol production.
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Qian S, Li X, Sun L, Shen Y, Ren Q, Diao E, Lu Z. Exploration of production of C 14 and C 15 bacillomycin D homologues with enzymatic hydrolysis from maize straws using fed-batch fermentation by Bacillus subtilis NS-174. RSC Adv 2020. [DOI: 10.1039/c9ra10536k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A strain with strong antifungal activity, Bacillus subtilis NS-174, was identified and the antifungal compounds were purified and structurally analyzed by high performance liquid chromatography-mass spectrometry/mass spectrometry (HPLC-MS/MS).
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Affiliation(s)
- Shiquan Qian
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake
- Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection
- Jiangsu Key Laboratory for Food Safety and Nutrition Function Evaluation
- Huaiyin Normal University
- Huaian 223300
| | - Xuejin Li
- School of Biological and Food Engineering
- Bengbu University
- Bengbu
- China
| | - Lu Sun
- School of Food and Biological Engineering
- Jiangsu University
- Zhenjiang
- China
| | - Yuanyuan Shen
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake
- Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection
- Jiangsu Key Laboratory for Food Safety and Nutrition Function Evaluation
- Huaiyin Normal University
- Huaian 223300
| | - Qingyi Ren
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake
- Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection
- Jiangsu Key Laboratory for Food Safety and Nutrition Function Evaluation
- Huaiyin Normal University
- Huaian 223300
| | - Enjie Diao
- Jiangsu Key Laboratory for Eco-Agricultural Biotechnology around Hongze Lake
- Jiangsu Collaborative Innovation Center of Regional Modern Agriculture & Environmental Protection
- Jiangsu Key Laboratory for Food Safety and Nutrition Function Evaluation
- Huaiyin Normal University
- Huaian 223300
| | - Zhaoxin Lu
- College of Food Science and Technology
- Nanjing Agricultural University
- Nanjing 210095
- China
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14
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Cao W, Cao W, Shen F, Luo J, Yin J, Qiao C, Wan Y. Membrane-assisted β-poly(L-malic acid) production from bagasse hydrolysates by Aureobasidium pullulans ipe-1. BIORESOURCE TECHNOLOGY 2020; 295:122260. [PMID: 31654946 DOI: 10.1016/j.biortech.2019.122260] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
Membrane-assisted β-poly(L-malic acid) (PMLA) production from bagasse hydrolysates was developed. For the first time, it was found that mixing the acid and enzyme hydrolysates was unfavorable for PMLA production because too high hexose: pentose ratio and glucose concentration in the mixed sugar could inhibit the assimilation of pentose. 120 g/L sugar concentrations in the acid hydrolysate was suitable for PMLA production with 23.2 g/L PMLA and 34.7 g/L biomass. Moreover, an integrated membrane process consisting of ultrafiltration, nanofiltration and reverse osmosis membranes could concentrate sugars and adjust acetic acid concentration prior to fermentation of lignocellulosic sugars. Meanwhile, it was found that 1.46 g/L acetic acid was preferred for PMLA production from enzyme hydrolysate or sole glucose which respectively increased PMLA production and cell growth by 25.4% and 5.9% from sole glucose, while it showed no significant enhancement in PMLA production with a higher cell growth and productivity from acid hydrolysate.
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Affiliation(s)
- Weifeng Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Weilei Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
| | - Fei Shen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Jianquan Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
| | - Junxiang Yin
- China National Center for Biotechnology Development, Beijing 100036, China
| | - Changsheng Qiao
- College of Bioengineering, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yinhua Wan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China.
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15
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Wang H, Zhai L, Geng A. Enhanced cellulase and reducing sugar production by a new mutant strain Trichoderma harzianum EUA20. J Biosci Bioeng 2019; 129:242-249. [PMID: 31561850 DOI: 10.1016/j.jbiosc.2019.08.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 08/28/2019] [Accepted: 08/29/2019] [Indexed: 11/16/2022]
Abstract
Trichoderma harzianum EU2-77 was a mutant strain of the wild-type strain T. harzianum NP13a isolated in Singapore. A multi-mutagenesis one-screening (MMOS) method was developed to further improve strain EU2-77 and a new mutant EUA20 was obtained. It exhibited filter paper cellulase (FPase) activity up to 14.79 IU/mL within 6 days shake flask cultivation. Activities of FPase, endoglucanase, β-glucosidase, and xylanase, and protein content by EUA20 were respectively increased to 5.73, 4.35, 7.34, 1.80 and 2.70 folds. Using pretreated oil palm empty fruit bunch (OPEFB) and corncob powder as the substrates, strain EUA20 presented approximate 6.52 and 8.80 IU/ml FPase activity. Reducing sugar yield of 615.8 and 636.8 mg/g biomass were respectively obtained for OPEFB and corncob powder using cellulolytic enzymes of strain EUA20. Our results demonstrated that mutant strain EUA20 had great potential in on-site cellulase production for effective biomass bioconversion.
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Affiliation(s)
- Hengwei Wang
- School of Life Sciences and Chemical Technology, Ngee Ann Polytechnic, 535 Clementi Road, 599489, Singapore.
| | - Lili Zhai
- School of Life Sciences and Chemical Technology, Ngee Ann Polytechnic, 535 Clementi Road, 599489, Singapore.
| | - Anli Geng
- School of Life Sciences and Chemical Technology, Ngee Ann Polytechnic, 535 Clementi Road, 599489, Singapore.
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16
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You S, Chang H, Zhang C, Gao L, Qi W, Tao Z, Su R, He Z. Recycling Strategy and Repression Elimination for Lignocellulosic-Based Farnesene Production with an Engineered Escherichia coli. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:9858-9867. [PMID: 31389230 DOI: 10.1021/acs.jafc.9b03907] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Farnesene is an important chemical platform for many industrial products, such as biofuels and polymers. We performed high-efficiency utilization of corncobs for β-farnesene production by separate hydrolysis and fermentation with an optimized Escherichia coli strain. First, we developed a recycling strategy for both corncob pretreatment and cellulose hydrolysis, which saved great amounts of pretreatment reagents and presented a 96.83% cellulose conversion rate into glucose. However, the corncob hydrolysate strongly repressed cell growth and β-farnesene production, being caused by high-concentrated citrate. Through expressing a heterologous ATP citrate lyase and screening for a suitable expression host, an optimized strain was constructed that produced β-farnesene at 4.06 g/L after 48 h in a 5 L fermenter, representing an approximately 2.3-fold increase over the initial strain. Therefore, the proposed strategy about the recycling process and repression elimination was successful and suitable for the production of lignocellulosic-based β-farnesene, which can be further studied to scale up for industrialization.
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Affiliation(s)
| | | | | | - Lan Gao
- SINOPEC CORP. Research Institute of Petroleum Processing (RIPP) , Beijing 100083 , P. R. China
| | - Wei Qi
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072 , P. R. China
| | - Zhiping Tao
- SINOPEC CORP. Research Institute of Petroleum Processing (RIPP) , Beijing 100083 , P. R. China
| | - Rongxin Su
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072 , P. R. China
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17
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The production of ethanol from lignocellulosic biomass by Kluyveromyces marxianus CICC 1727-5 and Spathaspora passalidarum ATCC MYA-4345. Appl Microbiol Biotechnol 2019; 103:2845-2855. [DOI: 10.1007/s00253-019-09625-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 11/18/2018] [Accepted: 12/16/2018] [Indexed: 11/25/2022]
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18
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Wang Y, Cao W, Luo J, Wan Y. Exploring the potential of lactic acid production from lignocellulosic hydrolysates with various ratios of hexose versus pentose by Bacillus coagulans IPE22. BIORESOURCE TECHNOLOGY 2018; 261:342-349. [PMID: 29677662 DOI: 10.1016/j.biortech.2018.03.135] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 03/29/2018] [Accepted: 03/30/2018] [Indexed: 06/08/2023]
Abstract
The aim of this study was to investigate the feasibility of utilizing different lignocellulosic hydrolysates with various hexose versus pentose (H:P) ratios to produce lactic acid (LA) from Bacillus coagulans IPE22 by fermentations with single and mixed sugar. In single sugar utilization, glucose tended to promote LA production, and xylose preferred to enhance cell growth. In mixed sugar utilization, glucose and pentose were consumed simultaneously when glucose concentration was lower than 20 g/L, and almost the same concentration of LA (50 g/L) was obtained regardless of the differences of H:P values. Finally, LA production from corn cob hydrolysates (CCH) contained 60 g/L mixed sugar verified the mechanisms found in the fermentations with simulated sugar mixture. Comparing with single glucose utilization, CCH utilization was faster and the yield of LA was not significantly affected. Therefore, the great potential of producing LA with lignocellulosic materials by B. coagulans was proved.
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Affiliation(s)
- Yujue Wang
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Weifeng Cao
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Jianquan Luo
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Yinhua Wan
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; University of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
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19
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Rodrussamee N, Sattayawat P, Yamada M. Highly efficient conversion of xylose to ethanol without glucose repression by newly isolated thermotolerant Spathaspora passalidarum CMUWF1-2. BMC Microbiol 2018; 18:73. [PMID: 30005621 PMCID: PMC6043994 DOI: 10.1186/s12866-018-1218-4] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Accepted: 06/28/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Efficient bioconversion of lignocellulosic biomass to bioethanol is one of key challenges in the situation of increasing bioethanol demand. The ethanologenic microbes for such conversion are required to possess abilities of utilization of various sugars including xylose and arabinose in lignocellulosic biomass. As required additional characteristics, there are a weak or no glucose repression that allows cells to simultaneously utilize various sugars together with glucose and thermotolerance for fermentation at high temperatures, which has several advantages including reduction of cooling cost. Spathaspora passalidarum ATCC MYA-4345, a type strains, isolated previously have mainly of these abilities or characteristics but its thermotolerance is not so strong and its glucose repression on xylose utilization is revealed. RESULTS Newly isolated S. passalidarum CMUWF1-2 was found to have a high ability to produce ethanol from various sugars included in lignocellulosic biomass at high temperatures. The strain achieved ethanol yields of 0.43 g, 0.40 g and 0.20 g ethanol/g xylose at 30 °C, 37 °C and 40 °C, respectively. Interestingly, no significant glucose repression was observed in experiments with mixed sugars, being consistent with the strong resistance to 2-deoxyglucose, and antimycin A showed no effect on its growth in xylose medium. Moreover, the strain was tolerant to glucose and ethanol at concentrations up to 35.0% (w/v) and 8.0% (v/v), respectively. CONCLUSIONS S. passalidarum CMUWF1-2 was shown to achieve efficient production of ethanol from various sugars and a high ethanol yield from xylose with little accumulation of xylitol. The strain also exhibited stress-resistance including thermotolerance and no detectable glucose repression as beneficial characteristics. Therefore, S. passalidarum CMUWF1-2 has remarkable potential for conversion of lignocellulosic biomass to bioethanol.
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Affiliation(s)
- Nadchanok Rodrussamee
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand. .,Center of Excellence in Bioresources for Agriculture, Industry and Medicine, Chiang Mai University, Chiang Mai, 50200, Thailand.
| | - Pachara Sattayawat
- Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Mamoru Yamada
- Life Science, Graduate School of Science and Technology for Innovation, Yamaguchi University, Ube, 755-8505, Japan.,Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Yamaguchi, 753-8515, Japan.,Research Center for Thermotolerant Microbial Resources, Yamaguchi University, Yamaguchi, 753-8315, Japan
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20
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Wang S, Sun X, Yuan Q. Strategies for enhancing microbial tolerance to inhibitors for biofuel production: A review. BIORESOURCE TECHNOLOGY 2018; 258:302-309. [PMID: 29567023 DOI: 10.1016/j.biortech.2018.03.064] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 03/07/2018] [Accepted: 03/09/2018] [Indexed: 05/05/2023]
Abstract
Using lignocellulosic biomass for the production of renewable biofuel provides a sustainable and promising solution to the crisis of energy and environment. However, the processes of biomass pretreatment and biofuel fermentation bring a variety of inhibitors to microbial strains. These inhibitors repress microbial growth, decrease biofuel yields and increase fermentation costs. The production of biofuels from renewable lignocellulosic biomass relies on the development of tolerant and robust microbial strains. In recent years, the advancement of tolerance engineering and evolutionary engineering provides powerful platform for obtaining host strains with desired tolerance for further metabolic engineering of biofuel pathways. In this review, we summarized the inhibitors derived from biomass pretreatment and biofuel fermentation, the mechanisms of inhibitor toxicity, and the strategies for enhancing microbial tolerance.
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Affiliation(s)
- Shizeng Wang
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China
| | - Xinxiao Sun
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China
| | - Qipeng Yuan
- State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, PR China.
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21
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Guo J, Huang S, Chen Y, Guo X, Xiao D. Heterologous expression of Spathaspora passalidarum xylose reductase and xylitol dehydrogenase genes improved xylose fermentation ability of Aureobasidium pullulans. Microb Cell Fact 2018; 17:64. [PMID: 29712559 PMCID: PMC5925849 DOI: 10.1186/s12934-018-0911-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 04/24/2018] [Indexed: 11/16/2022] Open
Abstract
Background Aureobasidium pullulans is a yeast-like fungus that can ferment xylose to generate high-value-added products, such as pullulan, heavy oil, and melanin. The combinatorial expression of two xylose reductase (XR) genes and two xylitol dehydrogenase (XDH) genes from Spathaspora passalidarum and the heterologous expression of the Piromyces sp. xylose isomerase (XI) gene were induced in A. pullulans to increase the consumption capability of A. pullulans on xylose. Results The overexpression of XYL1.2 (encoding XR) and XYL2.2 (encoding XDH) was the most beneficial for xylose utilization, resulting in a 17.76% increase in consumed xylose compared with the parent strain, whereas the introduction of the Piromyces sp. XI pathway failed to enhance xylose utilization efficiency. Mutants with superior xylose fermentation performance exhibited increased intracellular reducing equivalents. The fermentation performance of all recombinant strains was not affected when glucose or sucrose was utilized as the carbon source. The strain with overexpression of XYL1.2 and XYL2.2 exhibited excellent fermentation performance with mimicked hydrolysate, and pullulan production increased by 97.72% compared with that of the parent strain. Conclusions The present work indicates that the P4 mutant (using the XR/XDH pathway) with overexpressed XYL1.2 and XYL2.2 exhibited the best xylose fermentation performance. The P4 strain showed the highest intracellular reducing equivalents and XR and XDH activity, with consequently improved pullulan productivity and reduced melanin production. This valuable development in aerobic fermentation by the P4 strain may provide guidance for the biotransformation of xylose to high-value products by A. pullulans through genetic approach. Electronic supplementary material The online version of this article (10.1186/s12934-018-0911-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jian Guo
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
| | - Siyao Huang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
| | - Yefu Chen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China.
| | - Xuewu Guo
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
| | - Dongguang Xiao
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, 300457, People's Republic of China
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22
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Vu PT, Unpaprom Y, Ramaraj R. Impact and significance of alkaline-oxidant pretreatment on the enzymatic digestibility of Sphenoclea zeylanica for bioethanol production. BIORESOURCE TECHNOLOGY 2018; 247:125-130. [PMID: 28946085 DOI: 10.1016/j.biortech.2017.09.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 09/01/2017] [Accepted: 09/02/2017] [Indexed: 06/07/2023]
Abstract
Gooseweed (Sphenoclea zeylanica Gaertn.) is a pest on the rice field that has a potential to be a promising substrate for bioethanol production. Dry powdered gooseweed was firstly pretreated with 1% NaOH, following 1% H2O2 at variety conditions. The hydrolysis process was set at 50°C for 24-72h with enzyme cellulase (β-glucosidase) while the fermentation process was carried using Saccharomyces cerevisiae TISTR 5020 at 33°C for nine days. The ethanol concentration was recorded for three, five, seven, and nine days using an ebulliometer. The results showed that the treatment with only 1% NaOH for 24h has the highest sugar performance. In regard with hydrolysis, the optimum retention time was at 24h. Lastly, the highest ethanol concentration was achieved at 11.84g/L after five days and a rapid decreasing after seven to nine days was also observed.
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Affiliation(s)
- Phuong Thi Vu
- School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand
| | - Yuwalee Unpaprom
- Program in Biotechnology, Faculty of Science; Maejo University, Chiang Mai 50290, Thailand
| | - Rameshprabu Ramaraj
- School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand; Energy Research Center, Maejo University, Chiang Mai 50290, Thailand.
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Cadete RM, Rosa CA. The yeasts of the genus Spathaspora
: potential candidates for second-generation biofuel production. Yeast 2017; 35:191-199. [DOI: 10.1002/yea.3279] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 07/26/2017] [Accepted: 08/16/2017] [Indexed: 11/08/2022] Open
Affiliation(s)
- Raquel M. Cadete
- Departamento de Microbiologia, ICB, C.P. 486; Universidade Federal de Minas Gerais; Belo Horizonte MG 31270-901 Brazil
| | - Carlos A. Rosa
- Departamento de Microbiologia, ICB, C.P. 486; Universidade Federal de Minas Gerais; Belo Horizonte MG 31270-901 Brazil
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