1
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Noroozi K, Jarboe LR. Strategic nutrient sourcing for biomanufacturing intensification. J Ind Microbiol Biotechnol 2023; 50:kuad011. [PMID: 37245065 PMCID: PMC10549214 DOI: 10.1093/jimb/kuad011] [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: 01/04/2023] [Accepted: 05/20/2023] [Indexed: 05/29/2023]
Abstract
The successful design of economically viable bioprocesses can help to abate global dependence on petroleum, increase supply chain resilience, and add value to agriculture. Specifically, bioprocessing provides the opportunity to replace petrochemical production methods with biological methods and to develop novel bioproducts. Even though a vast range of chemicals can be biomanufactured, the constraints on economic viability, especially while competing with petrochemicals, are severe. There have been extensive gains in our ability to engineer microbes for improved production metrics and utilization of target carbon sources. The impact of growth medium composition on process cost and organism performance receives less attention in the literature than organism engineering efforts, with media optimization often being performed in proprietary settings. The widespread use of corn steep liquor as a nutrient source demonstrates the viability and importance of "waste" streams in biomanufacturing. There are other promising waste streams that can be used to increase the sustainability of biomanufacturing, such as the use of urea instead of fossil fuel-intensive ammonia and the use of struvite instead of contributing to the depletion of phosphate reserves. In this review, we discuss several process-specific optimizations of micronutrients that increased product titers by twofold or more. This practice of deliberate and thoughtful sourcing and adjustment of nutrients can substantially impact process metrics. Yet the mechanisms are rarely explored, making it difficult to generalize the results to other processes. In this review, we will discuss examples of nutrient sourcing and adjustment as a means of process improvement. ONE-SENTENCE SUMMARY The potential impact of nutrient adjustments on bioprocess performance, economics, and waste valorization is undervalued and largely undercharacterized.
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Affiliation(s)
- Kimia Noroozi
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
| | - Laura R Jarboe
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA
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2
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Zhang B, Liu X, Bao J. High solids loading pretreatment: The core of lignocellulose biorefinery as an industrial technology - An overview. BIORESOURCE TECHNOLOGY 2023; 369:128334. [PMID: 36403909 DOI: 10.1016/j.biortech.2022.128334] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 11/08/2022] [Accepted: 11/11/2022] [Indexed: 06/16/2023]
Abstract
Pretreatment is the first and most determinative, yet the least mature step of lignocellulose biorefinery chain. The current stagnation of biorefinery commercialization indicates the barriers of the existing pretreatment technologies are needed to be unlocked. This review focused on one of the core factors, the high lignocellulose solids loading in pretreatment. The high solids loading of pretreatment significantly reduces water input, energy requirement, toxic compound discharge, solid/liquid separation costs, and carbon dioxide emissions, improves the titers of sugars and biproducts to meet the industrial requirements. Meanwhile, lignocellulose feedstock after high solids loading pretreatment is compatible with the existing logistics system for densification, packaging, storage, and transportation. Both the technical-economic analysis and the cellulosic ethanol conversion performance suggest that the solids loading in the pretreatment step need to be further elevated towards an industrial technology and the effective solutions should be proposed to the technical barriers in high solids loading pretreatment operations.
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Affiliation(s)
- Bin Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xiucai Liu
- Cathay Biotech Inc, 1690 Cailun Road, Zhangjiang Hi-Tech Park, Shanghai 201203, China
| | - Jie Bao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.
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3
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Lin T, Meng F, Zhang M, Liu Q. Effects of different low temperature pretreatments on properties of corn stover biochar for precursors of sulfonated solid acid catalysts. BIORESOURCE TECHNOLOGY 2022; 357:127342. [PMID: 35605770 DOI: 10.1016/j.biortech.2022.127342] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/14/2022] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
In this study, the effects of different pretreatment methods including phosphoric acid (PA), freeze drying (FD) and phosphoric acid-freeze drying combined (PA-FD) pretreatment on corn stover characteristics and pyrolysis of corn stover samples was investigated. The results demonstrated that the physiochemical properties of biochars varied significantly. In comparison, PA pretreatment could effectively remove a large portion of inorganics and improve the fuel characteristics. PA-CSB-600 had a greater HHV, lower O/C and H/C ratios, and a lower biochar energy yield (Ye), indicating the possibility for an attractive fuel source. PA-FD pretreatment would significantly affected cell volume and caused mechanical damage to corn stover structure. As a sulfonated solid acid catalyst precursor, the results of cellulose catalytic hydrolysis indicated that the density of -SO3H in FD-CSA was much higher than PA-FD-CSA, but lower surface special area. Specifically, PA-FD-CSB prepared at 600 °C resulted in the maximum increase of cellulose conversion by 34.7-81.3%.
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Affiliation(s)
- Tianchi Lin
- Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Fanbin Meng
- Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Min Zhang
- Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Qingyu Liu
- Faculty of Engineering, Shenyang Agricultural University, Shenyang 110866, China.
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4
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Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon. Processes (Basel) 2021. [DOI: 10.3390/pr9030504] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.
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5
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Suriyachai N, Weerasai K, Upajak S, Khongchamnan P, Wanmolee W, Laosiripojana N, Champreda V, Suwannahong K, Imman S. Efficiency of Catalytic Liquid Hot Water Pretreatment for Conversion of Corn Stover to Bioethanol. ACS OMEGA 2020; 5:29872-29881. [PMID: 33251422 PMCID: PMC7689892 DOI: 10.1021/acsomega.0c04054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 11/03/2020] [Indexed: 05/04/2023]
Abstract
Lignocellulose is a promising raw material for the production of second-generation biofuels. In this study, the effects of acid-catalyzed liquid hot water (LHW) on pretreatment of corn stover (CS) for subsequent hydrolysis and conversion to ethanol were studied. The effects of reaction temperature, acid concentration, and residence time on glucose yield were evaluated using a response surface methodology. The optimal condition was 162.4 °C for 29.5 min with 0.45% v/v of sulfuric acid, leading to the maximum glucose yield of 91.05% from enzymatic hydrolysis of the cellulose-enriched fraction. Conversion of the solid fraction to ethanol by simultaneous saccharification and fermentation resulted in a theoretical ethanol yield of 93.91% based on digestible glucose. Scanning electron microscopy revealed disruption on the microstructure of the pretreated CS. Increases of crystallinity index and surface area of the pretreated biomass were observed along with alteration in the functional group profiles, as demonstrated by Fourier transform infrared spectroscopy. This work provides an insight into the effects of LHW on the enzymatic susceptibility and modification of the physicochemical properties of CS for further application on bioethanol production in biorefinery.
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Affiliation(s)
- Nopparat Suriyachai
- Integrated Biorefinery
excellent Center (IBC), School of Energy and Environment, University of Phayao, Tambon Maeka, Amphur Muang, Phayao 56000, Thailand
- BIOTEC-JGSEE
Integrative Biorefinery Laboratory, National
Center for Genetic Engineering and Biotechnology, Innovation Cluster 2 Building, Thailand Science
Park, Khlong Luang, Pathum
Thani 12120, Thailand
| | - Khatiya Weerasai
- The Joint Graduate School for Energy and Environment
(JGSEE), King Mongkut’s University
of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand
| | - Supawan Upajak
- School of Energy and
Environment, University of Phayao, Tambon Maeka, Amphur Muang, Phayao 56000, Thailand
| | - Punjarat Khongchamnan
- School of Energy and
Environment, University of Phayao, Tambon Maeka, Amphur Muang, Phayao 56000, Thailand
| | - Wanwitoo Wanmolee
- National Nanotechnology Center, National Science and Technology Development Agency, 111 Thailand Science Park, Paholyothin
Rd, Klong Laung, Pathum Thani 12120, Thailand
| | - Navadol Laosiripojana
- The Joint Graduate School for Energy and Environment
(JGSEE), King Mongkut’s University
of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand
- BIOTEC-JGSEE
Integrative Biorefinery Laboratory, National
Center for Genetic Engineering and Biotechnology, Innovation Cluster 2 Building, Thailand Science
Park, Khlong Luang, Pathum
Thani 12120, Thailand
| | - Verawat Champreda
- BIOTEC-JGSEE
Integrative Biorefinery Laboratory, National
Center for Genetic Engineering and Biotechnology, Innovation Cluster 2 Building, Thailand Science
Park, Khlong Luang, Pathum
Thani 12120, Thailand
| | - Kowit Suwannahong
- Department
of Environmental Health, Faculty of Public Health, Burapha University, Chonburi 20131, Thailand
| | - Saksit Imman
- Integrated Biorefinery
excellent Center (IBC), School of Energy and Environment, University of Phayao, Tambon Maeka, Amphur Muang, Phayao 56000, Thailand
- School of Energy and
Environment, University of Phayao, Tambon Maeka, Amphur Muang, Phayao 56000, Thailand
- . Tel.: +66-5446-6666. ext
3405
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6
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Preparation of Cellulose Nanofibers from Bagasse by Phosphoric Acid and Hydrogen Peroxide Enables Fibrillation via a Swelling, Hydrolysis, and Oxidation Cooperative Mechanism. NANOMATERIALS 2020; 10:nano10112227. [PMID: 33182529 PMCID: PMC7696933 DOI: 10.3390/nano10112227] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 11/05/2020] [Accepted: 11/06/2020] [Indexed: 12/19/2022]
Abstract
Due to the natural cellulose encapsulated in both lignin and hemicellulose matrices, as well as in plant cell walls with a compact and complex hierarchy, extracting cellulose nanofibers (CNFs) from lignocellulosic biomass is challenging. In this study, a sustainable high yield strategy with respect to other CNF preparations was developed. The cellulose was liberated from plant cell walls and fibrillated to a 7-22 nm thickness in one bath treatment with H3PO4 and H2O2 under mild conditions. The cellulose underwent swelling, the lignin underwent oxidative degradation, and the hemicellulose and a small amount of cellulose underwent acid hydrolysis. The CNFs' width was about 12 nm, with high yields (93% and 50% based on cellulose and biomass, respectively), and a 64% crystallinity and good thermal stability were obtained from bagasse. The current work suggests a strategy with simplicity, mild conditions, and cost-effectiveness, which means that this method can contribute to sustainable development for the preparation of CNFs.
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7
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Wang F, Shi D, Han J, Zhang G, Jiang X, Yang M, Wu Z, Fu C, Li Z, Xian M, Zhang H. Comparative Study on Pretreatment Processes for Different Utilization Purposes of Switchgrass. ACS OMEGA 2020; 5:21999-22007. [PMID: 32923758 PMCID: PMC7482092 DOI: 10.1021/acsomega.0c01047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 08/11/2020] [Indexed: 05/19/2023]
Abstract
Switchgrass (Panicum virgatum, L., Poaceae) with the advantages of high cellulose yield, and high growth even under low input and poor soil quality, has been identified as a promising candidate for production of low-cost biofuels, papermaking, and nanocellulose. In this study, 12 chemical pretreatments on a laboratory scale were compared for different utilization purposes of switchgrass. It was found that the pretreated switchgrass with sodium hydroxide showed considerable potential for providing mixed sugars for fermentation with 11.10% of residual lignin, 53.85% of residual cellulose, and 22.06% of residual hemicellulose. The pretreatment with 2.00% (v/v) nitric acid was the best method to remove 78.37% of hemicellulose and 39.82% of lignin under a low temperature (125 °C, 30 min), which can be used in the production of nanocellulose. Besides, a completely randomized design analysis of switchgrass pretreatments provided the alternative ethanol organosolv delignification of switchgrass for the papermaking industry with a high residual cellulose of 58.56%. Finally, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FT-IR) were carried out to confirm the changes in functional groups, crystallinity, and thermal behavior of the three materials, respectively, from the optimal pretreatments.
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Affiliation(s)
- Fan Wang
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Sino-Danish
College, University of Chinese Academy of
Sciences, 19(A) Yuquan
Road, Beijing 100049, China
| | - Dongxiang Shi
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Lanzhou
University of Technology, 287 Langongping Road, Lanzhou, Gansu 730050, China
| | - Ju Han
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Sino-Danish
College, University of Chinese Academy of
Sciences, 19(A) Yuquan
Road, Beijing 100049, China
| | - Ge Zhang
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Sino-Danish
College, University of Chinese Academy of
Sciences, 19(A) Yuquan
Road, Beijing 100049, China
| | - Xinglin Jiang
- The
Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kemitorvet Building 220, Kongens Lyngby 2800, Denmark
| | - Mingjun Yang
- Lanzhou
University of Technology, 287 Langongping Road, Lanzhou, Gansu 730050, China
| | - Zhenying Wu
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
| | - Chunxiang Fu
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
| | - Zhihao Li
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
| | - Mo Xian
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Sino-Danish
College, University of Chinese Academy of
Sciences, 19(A) Yuquan
Road, Beijing 100049, China
| | - Haibo Zhang
- Key
Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and
Bioprocess Technology, Chinese Academy of
Sciences, 189 Songling Road, Qingdao, Shandong 266101, China
- Sino-Danish
College, University of Chinese Academy of
Sciences, 19(A) Yuquan
Road, Beijing 100049, China
- . Phone: +86 139 6978 0438
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8
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Hossain A, Rahaman MS, Lee D, Phung TK, Canlas CG, Simmons BA, Renneckar S, Reynolds W, George A, Tulaphol S, Sathitsuksanoh N. Enhanced Softwood Cellulose Accessibility by H 3PO 4 Pretreatment: High Sugar Yield without Compromising Lignin Integrity. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b05873] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Anwar Hossain
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky 40292, United States
| | - Mohammad Shahinur Rahaman
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky 40292, United States
| | - David Lee
- Joint BioEnergy Institute, 5885 Hollis St, Emeryville, California 94608, United States
| | - Thanh Khoa Phung
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky 40292, United States
| | - Christian G. Canlas
- King Abdullah University of Science and Technology (KAUST), Core Laboratories, Thuwal, 23955-6900 Saudi Arabia
- College of Chemistry, University of California at Berkeley, Berkeley, California 94720, United States
| | - Blake A. Simmons
- Joint BioEnergy Institute, 5885 Hollis St, Emeryville, California 94608, United States
- Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, United States
| | - Scott Renneckar
- Faculty of Forestry, University of British Columbia, Vancouver, Canada
| | - William Reynolds
- Department of Materials Science & Engineering, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Anthe George
- Joint BioEnergy Institute, 5885 Hollis St, Emeryville, California 94608, United States
- Sandia National Laboratories, 7011 East Ave, Livermore, California 94551, United States
| | - Sarttrawut Tulaphol
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky 40292, United States
- Department of Chemistry, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
| | - Noppadon Sathitsuksanoh
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky 40292, United States
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Wang Z, Cheng Q, Liu Z, Qu J, Chu X, Li N, Noor RS, Liu C, Qu B, Sun Y. Evaluation of methane production and energy conversion from corn stalk using furfural wastewater pretreatment for whole slurry anaerobic co-digestion. BIORESOURCE TECHNOLOGY 2019; 293:121962. [PMID: 31449921 DOI: 10.1016/j.biortech.2019.121962] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 08/03/2019] [Accepted: 08/05/2019] [Indexed: 05/22/2023]
Abstract
In this study, corn stalk (CS) was pretreated with furfural wastewater (FWW) for whole slurry anaerobic digestion (AD), which increased the degradability of CS components, changed the parameters in pretreatment slurry and improved the biochemical methane potential (BMP). The ultimate goal was to optimize the time and temperature for FWW pretreatment and evaluate whether FWW pretreatment is feasible from BMP and energy conversion. The results of path analysis suggested that lignocellulosic degradability (LD) was the main factor affecting methane production with the comprehensive decision of 0.7006. The highest BMP (166.34 mL/g VS) was achieved by the pretreatment at 35 °C for 6 days, which was 70.36% higher than that of control check (CK) (97.64 mL/g VS) and the optimal pretreatment condition was predicted at 40.69 °C for 6.49 days by response surface methodology (RSM). The net residual value (NRV) for the pretreatment of 35 °C and 6 days was the highest (0.6201), which was the most appropriate condition for AD in real application.
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Affiliation(s)
- Zhi Wang
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Qiushuang Cheng
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Zhiyuan Liu
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Jingbo Qu
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Xiaodong Chu
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Nan Li
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Rana Shahzad Noor
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Changyu Liu
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Bin Qu
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China
| | - Yong Sun
- College of Engineering, Northeast Agriculture University, Harbin 150030, PR China; Key Laboratory of Agricultural Renewable Resources Utilization Technology and Equipment in Cold Areas of Heilongjiang Province, Harbin 150030, PR China.
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10
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Wang L, York SW, Ingram LO, Shanmugam KT. Simultaneous fermentation of biomass-derived sugars to ethanol by a co-culture of an engineered Escherichia coli and Saccharomyces cerevisiae. BIORESOURCE TECHNOLOGY 2019; 273:269-276. [PMID: 30448678 DOI: 10.1016/j.biortech.2018.11.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/04/2018] [Accepted: 11/05/2018] [Indexed: 06/09/2023]
Abstract
Microorganisms ferment xylose at high rate only when glucose concentration in the medium falls below a critical level. Since the specific productivity of product is highest during exponential to early stationary phase of growth, a glucose utilization negative ethanologenic E. coli (strain LW419a) was constructed for high rate of xylose fermentation in combination with Turbo yeast. This co-culture fermented all the released sugars in an acid/enzyme-treated sugar cane bagasse slurry (10% solids) to an ethanol titer of 24.9 ± 0.8 g.L-1 (70% of the theoretical yield) in <30 h. Ethanol titer increased to 48.6 ± 1.04 g.L-1 (yield, 0.45 g.g-1 sugars) at a solids content of 20% and the highest rate of xylose consumption was 1.58 ± 0.21 g.L-1.h-1. This study demonstrates the potential of a co-culture of strain LW419a and yeast to rapidly ferment all the sugars in pretreated biomass slurries to ethanol at their respective highest rates.
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Affiliation(s)
- Liang Wang
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - Sean W York
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - Lonnie O Ingram
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
| | - K T Shanmugam
- Department of Microbiology and Cell Science, University of Florida, Gainesville, FL 32611, United States.
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11
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Yang P, Wu Y, Zheng Z, Cao L, Zhu X, Mu D, Jiang S. CRISPR-Cas9 Approach Constructing Cellulase sestc-Engineered Saccharomyces cerevisiae for the Production of Orange Peel Ethanol. Front Microbiol 2018; 9:2436. [PMID: 30364071 PMCID: PMC6191481 DOI: 10.3389/fmicb.2018.02436] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Accepted: 09/24/2018] [Indexed: 11/25/2022] Open
Abstract
The development of lignocellulosic bioethanol plays an important role in the substitution of petrochemical energy and high-value utilization of agricultural wastes. The safe and stable expression of cellulase gene sestc was achieved by applying the clustered regularly interspaced short palindromic repeats-Cas9 approach to the integration of sestc expression cassette containing Agaricus biporus glyceraldehyde-3-phosphate-dehydrogenase gene (gpd) promoter in the Saccharomyces cerevisiae chromosome. The target insertion site was found to be located in the S. cerevisiae hexokinase 2 by designing a gRNA expression vector. The recombinant SESTC protein exhibited a size of approximately 44 kDa in the engineered S. cerevisiae. By using orange peel as the fermentation substrate, the filter paper, endo-1,4-β-glucanase, exo-1,4-β-glucanase activities of the transformants were 1.06, 337.42, and 1.36 U/mL, which were 35.3-fold, 23.03-fold, and 17-fold higher than those from wild-type S. cerevisiae, respectively. After 6 h treatment, approximately 20 g/L glucose was obtained. Under anaerobic conditions the highest ethanol concentration reached 7.53 g/L after 48 h fermentation and was 37.7-fold higher than that of wild-type S. cerevisiae (0.2 g/L). The engineered strains may provide a valuable material for the development of lignocellulosic ethanol.
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Affiliation(s)
- Peizhou Yang
- College of Food and Biological Engineering, Anhui Key Laboratory of Intensive Processing of Agricultural Products, Hefei University of Technology, Hefei, China
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12
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Wang Q, Tian D, Hu J, Shen F, Yang G, Zhang Y, Deng S, Zhang J, Zeng Y, Hu Y. Fates of hemicellulose, lignin and cellulose in concentrated phosphoric acid with hydrogen peroxide (PHP) pretreatment. RSC Adv 2018; 8:12714-12723. [PMID: 35541248 PMCID: PMC9079361 DOI: 10.1039/c8ra00764k] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 03/27/2018] [Indexed: 11/30/2022] Open
Abstract
Xylan, de-alkaline lignin and microcrystalline cellulose were employed as representative models of hemicellulose, lignin and cellulose in lignocellulosic biomass. These three model compounds, together with the real-world biomass, wheat straw were pretreated using the newly developed PHP pretreatment (concentrated phosphoric acid plus hydrogen peroxide) to better understand the structural changes of the recovered solid and chemical fractions in the liquid. Results showed that almost all xylan and higher than 70% lignin were removed from wheat straw, and more than 90% cellulose was recovered in the solid fraction. The pretreated model xylan recovered via ethanol-precipitation still maintained its original structural features. The degree of polymerization of soluble xylooligosaccharides in liquid was reduced, resulting in the increase of monomeric xylose release. Further xylose oxidization via the path of 2-furancarboxylic acid → 2(5H)-furanone → acrylic acid → formic acid was mainly responsible for xylan degradation. The chemical structure of de-alkaline lignin was altered significantly by PHP pretreatment. Basic guaiacyl units of lignin were depolymerized, and aromatic rings and side aliphatic chains were partially decomposed. Ring-opening reactions of the aromatics and cleavage of C–O–C linkages were two crucial paths to lignin oxidative degradation. In contrast to lignin, no apparent changes occurred on microcrystalline cellulose. The reason was likely that acid-depolymerization and oxidative degradation of cellulose were greatly prevented by the formed cellulose phosphate. The transformation of cellulose, hemicellulose, and lignin in lignocellulosic biomass in a novel pretreatment are elucidated based on model fractions.![]()
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