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Gao W, Li Z, Liu T, Wang Y. Production of high-concentration fermentable sugars from lignocellulosic biomass by using high solids fed-batch enzymatic hydrolysis. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108186] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Zhang Y, Vera JM, Xie D, Serate J, Pohlmann E, Russell JD, Hebert AS, Coon JJ, Sato TK, Landick R. Multiomic Fermentation Using Chemically Defined Synthetic Hydrolyzates Revealed Multiple Effects of Lignocellulose-Derived Inhibitors on Cell Physiology and Xylose Utilization in Zymomonas mobilis. Front Microbiol 2019; 10:2596. [PMID: 31787963 PMCID: PMC6853872 DOI: 10.3389/fmicb.2019.02596] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 10/25/2019] [Indexed: 01/14/2023] Open
Abstract
Utilization of both C5 and C6 sugars to produce biofuels and bioproducts is a key goal for the development of integrated lignocellulosic biorefineries. Previously we found that although engineered Zymomonas mobilis 2032 was able to ferment glucose to ethanol when fermenting highly concentrated hydrolyzates such as 9% glucan-loading AFEX-pretreated corn stover hydrolyzate (9% ACSH), xylose conversion after glucose depletion was greatly impaired. We hypothesized that impaired xylose conversion was caused by lignocellulose-derived inhibitors (LDIs) in hydrolyzates. To investigate the effects of LDIs on the cellular physiology of Z. mobilis during fermentation of hydrolyzates, including impacts on xylose utilization, we generated synthetic hydrolyzates (SynHs) that contained nutrients and LDIs at concentrations found in 9% ACSH. Comparative fermentations of Z. mobilis 2032 using SynH with or without LDIs were performed, and samples were collected for end product, transcriptomic, metabolomic, and proteomic analyses. Several LDI-specific effects were observed at various timepoints during fermentation including upregulation of sulfur assimilation and cysteine biosynthesis, upregulation of RND family efflux pump systems (ZMO0282-0285) and ZMO1429-1432, downregulation of a Type I secretion system (ZMO0252-0255), depletion of reduced glutathione, and intracellular accumulation of mannose-1P and mannose-6P. Furthermore, when grown in SynH containing LDIs, Z. mobilis 2032 only metabolized ∼50% of xylose, compared to ∼80% in SynH without LDIs, recapitulating the poor xylose utilization observed in 9% ACSH. Our metabolomic data suggest that the overall flux of xylose metabolism is reduced in the presence of LDIs. However, the expression of most genes involved in glucose and xylose assimilation was not affected by LDIs, nor did we observe blocks in glucose and xylose metabolic pathways. Accumulations of intracellular xylitol and xylonic acid was observed in both SynH with and without LDIs, which decreased overall xylose-to-ethanol conversion efficiency. Our results suggest that xylose metabolism in Z. mobilis 2032 may not be able to support the cellular demands of LDI mitigation and detoxification during fermentation of highly concentrated lignocellulosic hydrolyzates with elevated levels of LDIs. Together, our findings identify several cellular responses to LDIs and possible causes of impaired xylose conversion that will enable future strain engineering of Z. mobilis.
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Affiliation(s)
- Yaoping Zhang
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Jessica M Vera
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Dan Xie
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Jose Serate
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Edward Pohlmann
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Jason D Russell
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Alexander S Hebert
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Joshua J Coon
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Trey K Sato
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
| | - Robert Landick
- DOE-Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI, United States
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Yang Y, Hu M, Tang Y, Geng B, Qiu M, He Q, Chen S, Wang X, Yang S. Progress and perspective on lignocellulosic hydrolysate inhibitor tolerance improvement in Zymomonas mobilis. BIORESOUR BIOPROCESS 2018. [DOI: 10.1186/s40643-018-0193-9] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Romero-Güiza MS, Wahid R, Hernández V, Møller H, Fernández B. Improvement of wheat straw anaerobic digestion through alkali pre-treatment: Carbohydrates bioavailability evaluation and economic feasibility. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 595:651-659. [PMID: 28402918 DOI: 10.1016/j.scitotenv.2017.04.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Revised: 03/28/2017] [Accepted: 04/01/2017] [Indexed: 06/07/2023]
Abstract
Lignocellulosic biomasses such as wheat straw are widely used as a feedstock for biogas production. However, these biomasses are mainly composed of a compact fibre structure and therefore, it is recommended to treat them prior to its usage for biogas production in order to improve their bioavailability. The aim of this work is to evaluate, in terms of performance stability, methane yield and economic feasibility, two different scenarios: a mesophilic codigestion of wheat straw and animal manure with or without a low-energy demand alkaline pre-treatment (0.08gKOHgTS-1of wheat straw, for 24h and at 25°C). Besides this, said pre-treatment was also analysed based on the improvement of the bioavailable carbohydrate content in the untreated versus the pre-treated wheat straw. The results pointed out that pre-treated wheat straw prompted a more stable performance (in terms of pH and alkalinity) and an improved methane yield (128% increment) of the mesophilic codigestion process, in comparison to the "untreated" scenario. The pre-treatment increased the content of cellulose, hemicellulose and other compounds (waxes, pectin, oil, etc.) in the liquid fraction, from 5% to 60%, from 11.5% to 39.1% TS and from 57% to 79% of the TS in the liquid fraction for the untreated and pre-treated wheat straws, respectively. Finally, the pre-treated scenario gained an energy surplus of a factor 13.5 and achieved a positive net benefit of 90.4€tVS-WS-1d-1, being a favourable case for an eventual scale-up of the combined process.
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Affiliation(s)
- Maycoll Stiven Romero-Güiza
- IRTA, GIRO-UPC Joint Unit, Torre Marimon, Road C59- km 12, E 08140 Caldes de Montbui, 08140 Barcelona, Spain
| | - Radziah Wahid
- Department of Engineering, Aarhus University, Blichers Allé 20, DK 8830 Tjele, Denmark; Faculty of Chemical Engineering, Universiti Teknologi Mara, 40450 Shah Alam, Malaysia
| | - Verónica Hernández
- Department of Engineering, Aarhus University, Blichers Allé 20, DK 8830 Tjele, Denmark
| | - Henrik Møller
- Department of Engineering, Aarhus University, Blichers Allé 20, DK 8830 Tjele, Denmark
| | - Belén Fernández
- IRTA, GIRO-UPC Joint Unit, Torre Marimon, Road C59- km 12, E 08140 Caldes de Montbui, 08140 Barcelona, Spain.
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Hafid HS, Nor 'Aini AR, Mokhtar MN, Talib AT, Baharuddin AS, Umi Kalsom MS. Over production of fermentable sugar for bioethanol production from carbohydrate-rich Malaysian food waste via sequential acid-enzymatic hydrolysis pretreatment. WASTE MANAGEMENT (NEW YORK, N.Y.) 2017; 67:95-105. [PMID: 28527863 DOI: 10.1016/j.wasman.2017.05.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 05/08/2017] [Accepted: 05/11/2017] [Indexed: 06/07/2023]
Abstract
In Malaysia, the amount of food waste produced is estimated at approximately 70% of total municipal solid waste generated and characterised by high amount of carbohydrate polymers such as starch, cellulose, and sugars. Considering the beneficial organic fraction contained, its utilization as an alternative substrate specifically for bioethanol production has receiving more attention. However, the sustainable production of bioethanol from food waste is linked to the efficient pretreatment needed for higher production of fermentable sugar prior to fermentation. In this work, a modified sequential acid-enzymatic hydrolysis process has been developed to produce high concentration of fermentable sugars; glucose, sucrose, fructose and maltose. The process started with hydrothermal and dilute acid pretreatment by hydrochloric acid (HCl) and sulphuric acid (H2SO4) which aim to degrade larger molecules of polysaccharide before accessible for further steps of enzymatic hydrolysis by glucoamylase. A kinetic model is proposed to perform an optimal hydrolysis for obtaining high fermentable sugars. The results suggested that a significant increase in fermentable sugar production (2.04-folds) with conversion efficiency of 86.8% was observed via sequential acid-enzymatic pretreatment as compared to dilute acid pretreatment (∼42.4% conversion efficiency). The bioethanol production by Saccharomyces cerevisiae utilizing fermentable sugar obtained shows ethanol yield of 0.42g/g with conversion efficiency of 85.38% based on the theoretical yield was achieved. The finding indicates that food waste can be considered as a promising substrate for bioethanol production.
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Affiliation(s)
- Halimatun Saadiah Hafid
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
| | - Abdul Rahman Nor 'Aini
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
| | - Mohd Noriznan Mokhtar
- Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
| | - Ahmad Tarmezee Talib
- Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
| | - Azhari Samsu Baharuddin
- Department of Process and Food Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
| | - Md Shah Umi Kalsom
- Department of Bioprocess Technology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM, Serdang, Selangor, Malaysia.
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Zhang J, Shao S, Bao J. Long term storage of dilute acid pretreated corn stover feedstock and ethanol fermentability evaluation. BIORESOURCE TECHNOLOGY 2016; 201:355-359. [PMID: 26639616 DOI: 10.1016/j.biortech.2015.11.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 11/07/2015] [Accepted: 11/09/2015] [Indexed: 06/05/2023]
Abstract
This study reported a new solution of lignocellulose feedstock storage based on the distributed pretreatment concept. The dry dilute sulfuric acid pretreatment (DDAP) was conducted on corn stover feedstock, instead of ammonia fiber explosion pretreatment. Then the dry dilute acid pretreated corn stover was stored for three months during summer season with high temperature and humidity. No negative aspects were found on the physical property, composition, hydrolysis yield and ethanol fermentability of the long term stored pretreated corn stover, plus the additional merits including no chemicals recovery operation, anti-microbial contaminant environment from stronger acid and inhibitor contents, as well as the mild and slow hydrolysis in the storage. The new pretreatment method expanded the distributed pretreatment concept of feedstock storage with potential for practical application.
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Affiliation(s)
- Jian Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Shuai Shao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, 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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Bai Z, Gao Z, He B, Wu B. Effect of lignocellulose-derived inhibitors on the growth and d-lactic acid production of Sporolactobacillus inulinus YBS1-5. Bioprocess Biosyst Eng 2015. [DOI: 10.1007/s00449-015-1440-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Serate J, Xie D, Pohlmann E, Donald C, Shabani M, Hinchman L, Higbee A, Mcgee M, La Reau A, Klinger GE, Li S, Myers CL, Boone C, Bates DM, Cavalier D, Eilert D, Oates LG, Sanford G, Sato TK, Dale B, Landick R, Piotrowski J, Ong RG, Zhang Y. Controlling microbial contamination during hydrolysis of AFEX-pretreated corn stover and switchgrass: effects on hydrolysate composition, microbial response and fermentation. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:180. [PMID: 26583044 PMCID: PMC4650398 DOI: 10.1186/s13068-015-0356-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 10/09/2015] [Indexed: 05/04/2023]
Abstract
BACKGROUND Microbial conversion of lignocellulosic feedstocks into biofuels remains an attractive means to produce sustainable energy. It is essential to produce lignocellulosic hydrolysates in a consistent manner in order to study microbial performance in different feedstock hydrolysates. Because of the potential to introduce microbial contamination from the untreated biomass or at various points during the process, it can be difficult to control sterility during hydrolysate production. In this study, we compared hydrolysates produced from AFEX-pretreated corn stover and switchgrass using two different methods to control contamination: either by autoclaving the pretreated feedstocks prior to enzymatic hydrolysis, or by introducing antibiotics during the hydrolysis of non-autoclaved feedstocks. We then performed extensive chemical analysis, chemical genomics, and comparative fermentations to evaluate any differences between these two different methods used for producing corn stover and switchgrass hydrolysates. RESULTS Autoclaving the pretreated feedstocks could eliminate the contamination for a variety of feedstocks, whereas the antibiotic gentamicin was unable to control contamination consistently during hydrolysis. Compared to the addition of gentamicin, autoclaving of biomass before hydrolysis had a minimal effect on mineral concentrations, and showed no significant effect on the two major sugars (glucose and xylose) found in these hydrolysates. However, autoclaving elevated the concentration of some furanic and phenolic compounds. Chemical genomics analyses using Saccharomyces cerevisiae strains indicated a high correlation between the AFEX-pretreated hydrolysates produced using these two methods within the same feedstock, indicating minimal differences between the autoclaving and antibiotic methods. Comparative fermentations with S. cerevisiae and Zymomonas mobilis also showed that autoclaving the AFEX-pretreated feedstocks had no significant effects on microbial performance in these hydrolysates. CONCLUSIONS Our results showed that autoclaving the pretreated feedstocks offered advantages over the addition of antibiotics for hydrolysate production. The autoclaving method produced a more consistent quality of hydrolysate, and also showed negligible effects on microbial performance. Although the levels of some of the lignocellulose degradation inhibitors were elevated by autoclaving the feedstocks prior to enzymatic hydrolysis, no significant effects on cell growth, sugar utilization, or ethanol production were seen during bacterial or yeast fermentations in hydrolysates produced using the two different methods.
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Affiliation(s)
- Jose Serate
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Dan Xie
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Edward Pohlmann
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Charles Donald
- />DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
| | - Mahboubeh Shabani
- />DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
| | - Li Hinchman
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Alan Higbee
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Mick Mcgee
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Alex La Reau
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Grace E. Klinger
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Sheena Li
- />RIKEN Center for Sustainable Resource Science, Wako, Saitama Japan
| | - Chad L. Myers
- />Department of Computer Science and Engineering, University of Minnesota-Twin Cities, Minneapolis, MN USA
| | - Charles Boone
- />Terrence Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, ON Canada
| | - Donna M. Bates
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Dave Cavalier
- />DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
| | - Dustin Eilert
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Lawrence G. Oates
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Gregg Sanford
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Trey K. Sato
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Bruce Dale
- />DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
| | - Robert Landick
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Jeff Piotrowski
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
| | - Rebecca Garlock Ong
- />DOE Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, MI USA
| | - Yaoping Zhang
- />DOE Great Lakes Bioenergy Research Center, University of Wisconsin-Madison, Madison, WI USA
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