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Patil V, Huang L, Liang J, Sun L, Wang D, Gao Y, Chen C. The allelopathic potential of red macroalga Pyropia haitanensis solvent extracts on controlling bloom-forming microalgae: Insights into the inhibitory compounds. Ecotoxicol Environ Saf 2024; 272:116083. [PMID: 38350220 DOI: 10.1016/j.ecoenv.2024.116083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 02/15/2024]
Abstract
Various strategies have been explored to mitigate the impact of harmful algal blooms (HABs). While chemical and physical methods have traditionally been employed to regulate microalgal growth, their prolonged adverse effects on the ecosystem are a cause for concern. Recognizing the integral role of macroalgae within the ecosystem, this study reveals the anti-algal properties of solvent-based extracts derived from the red macroalga Pyropia haitanensis as a means of preventing microalgal blooms. In our investigation, we initially assessed the growth-inhibitory effects of methanol and acetone extracts from P. haitanensis on five microalgae known to contribute to bloom-formation. Significantly reduced growth was observed in all microalgal species when inoculated with both methanol and acetone extracts. Further analysis revealed the effectiveness of the methanol extract (ME), and further fractionation with petroleum ether (PE), ethyl acetate (EA), and n-butanol (NB) for testing against Skeletonema costatum and Pseudo-nitzschia pungens. The methanol fractions exhibited strong inhibition, resulting in the complete elimination of both microalgae after 96 hours of exposure to PE, EA, and NB extracts. Gas Chromatography-Mass Spectroscopy (GC-MS) analysis of the ME and its solvent fractions identified 49 confirmed compounds. These compounds are likely potential contributors to the observed inhibition of microalgal growth. In conclusion, our findings suggest that solvent extracts from P. haitanensis possess substantial potential for the control of HABs, offering a promising avenue for further research and application in ecosystem management.
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Affiliation(s)
- Vishal Patil
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China; State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Lu Huang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Junrong Liang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Lin Sun
- State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Dazhi Wang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China; State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Yahui Gao
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China; State Key Laboratory of Marine Environmental Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
| | - Changping Chen
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of Environment and Ecology/ School of Life Sciences, Xiamen University, Xiang'an Campus, Xiamen, Fujian 361102, China.
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Yuan HW, Tan L, Kida K, Morimura S, Sun ZY, Tang YQ. Potential for reduced water consumption in biorefining of lignocellulosic biomass to bioethanol and biogas. J Biosci Bioeng 2021; 131:461-8. [PMID: 33526306 DOI: 10.1016/j.jbiosc.2020.12.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 12/02/2020] [Accepted: 12/27/2020] [Indexed: 12/29/2022]
Abstract
Increasing ethanol demand and public concerns about environmental protection promote the production of lignocellulosic bioethanol. Compared to that of starch- and sugar-based bioethanol production, the production of lignocellulosic bioethanol is water-intensive. A large amount of water is consumed during pretreatment, detoxification, saccharification, and fermentation. Water is a limited resource, and very high water consumption limits the industrial production of lignocellulosic bioethanol and decreases its environmental feasibility. In this review, we focused on the potential for reducing water consumption during the production of lignocellulosic bioethanol by performing pretreatment and fermentation at high solid loading, omitting water washing after pretreatment, and recycling wastewater by integrating bioethanol production and anaerobic digestion. In addition, the feasibility of these approaches and their research progress were discussed. This comprehensive review is expected to draw attention to water competition between bioethanol production and human use.
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Tramontina R, Brenelli LB, Sodré V, Franco Cairo JP, Travália BM, Egawa VY, Goldbeck R, Squina FM. Enzymatic removal of inhibitory compounds from lignocellulosic hydrolysates for biomass to bioproducts applications. World J Microbiol Biotechnol 2020; 36:166. [PMID: 33000321 DOI: 10.1007/s11274-020-02942-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 09/25/2020] [Indexed: 01/04/2023]
Abstract
The physicochemical pretreatment is an important step to reduce biomass recalcitrance and facilitate further processing of plant lignocellulose into bioproducts. This process results in soluble and insoluble biomass fractions, and both may contain by-products that inhibit enzymatic biocatalysts and microbial fermentation. These fermentation inhibitory compounds (ICs) are produced during the degradation of lignin and sugars, resulting in phenolic and furanic compounds, and carboxylic acids. Therefore, detoxification steps may be required to improve lignocellulose conversion by microoganisms. Several physical and chemical methods, such as neutralization, use of activated charcoal and organic solvents, have been developed and recommended for removal of ICs. However, biological processes, especially enzyme-based, have been shown to efficiently remove ICs with the advantage of minimizing environmental issues since they are biogenic catalysts and used in low quantities. This review focuses on describing several enzymatic approaches to promote detoxification of lignocellulosic hydrolysates and improve the performance of microbial fermentation for the generation of bioproducts. Novel strategies using classical carbohydrate active enzymes (CAZymes), such as laccases (AA1) and peroxidases (AA2), as well as more advanced strategies using prooxidant, antioxidant and detoxification enzymes (dubbed as PADs), i.e. superoxide dismutases, are discussed as perspectives in the field.
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Affiliation(s)
- Robson Tramontina
- Programa de Pós-Graduação em Biociências e Tecnologia de Produtos Bioativos (BTPB), Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo, Brazil
- School of Food Engineering, State University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Lívia Beatriz Brenelli
- Interdisciplinary Center of Energy Planning (NIPE), State University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Victoria Sodré
- Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba (UNISO), Sorocaba, São Paulo, Brazil
- Programa de Pós-Graduação em Biologia Funcional e Molecular (BFM), Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - João Paulo Franco Cairo
- Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba (UNISO), Sorocaba, São Paulo, Brazil
| | | | - Viviane Yoshimi Egawa
- School of Agriculture, São Paulo State University (UNESP), Botucatu, São Paulo, Brazil
| | - Rosana Goldbeck
- School of Food Engineering, State University of Campinas (UNICAMP), Campinas, São Paulo, Brazil
| | - Fabio Marcio Squina
- Programa de Processos Tecnológicos e Ambientais, Universidade de Sorocaba (UNISO), Sorocaba, São Paulo, Brazil.
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Magalhães AI, de Carvalho JC, Thoms JF, Souza Silva R, Soccol CR. Second-generation itaconic acid: An alternative product for biorefineries? Bioresour Technol 2020; 308:123319. [PMID: 32278999 DOI: 10.1016/j.biortech.2020.123319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 04/02/2020] [Accepted: 04/03/2020] [Indexed: 06/11/2023]
Abstract
The ability to produce second-generation itaconic acid by Aspergillus terreus, and the inhibitory effects of hydrolysis by-products on the fermentation were evaluated by cultivation in a synthetic medium containing components usually present in a real hydrolysate broth from lignocellulosic biomasses. The results showed that A. terreus NRRL 1960 can produce itaconic acid and consume xylose completely, but the conversion is less than the fermentation using only glucose. In addition, compared to fermentation of glucose, or even xylose, the mix of both sugars resulted in a lower itaconic acid yield. In the inhibitory test, the final itaconic acid titer was reduced by acetic acid, furfural, and 5-hydroxymethylfurfural concentrations of, respectively, 188, 175, and 700 mg L-1. However, the presence of any amount of acetic acid proved to be detrimental to itaconic acid production. This research sheds some light on doubts about the biorefinery implementation of itaconic acid production.
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Affiliation(s)
- Antonio Irineudo Magalhães
- Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, P.O. Box 19011, ZIP Code 81531-990, Curitiba, Paraná, Brazil
| | - Júlio Cesar de Carvalho
- Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, P.O. Box 19011, ZIP Code 81531-990, Curitiba, Paraná, Brazil.
| | - Juliano Feliz Thoms
- Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, P.O. Box 19011, ZIP Code 81531-990, Curitiba, Paraná, Brazil
| | - Rafaeli Souza Silva
- Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, P.O. Box 19011, ZIP Code 81531-990, Curitiba, Paraná, Brazil
| | - Carlos Ricardo Soccol
- Federal University of Paraná, Department of Bioprocess Engineering and Biotechnology, P.O. Box 19011, ZIP Code 81531-990, Curitiba, Paraná, Brazil
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Valdez-Guzmán BE, Rios-Del Toro EE, Cardenas-López RL, Méndez-Acosta HO, González-Álvarez V, Arreola-Vargas J. Enhancing biohydrogen production from Agave tequilana bagasse: Detoxified vs. Undetoxified acid hydrolysates. Bioresour Technol 2019; 276:74-80. [PMID: 30611089 DOI: 10.1016/j.biortech.2018.12.101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 12/25/2018] [Accepted: 12/26/2018] [Indexed: 06/09/2023]
Abstract
The aim of this work was to compare the biohydrogen production potential of undetoxified and detoxified acid hydrolysates from A. tequilana bagasse. Detoxification was carried out with activated carbon at different concentrations and pH values. Results indicated that pH was not a significant variable, while the lowest evaluated concentration of activated carbon (1% p/v) significantly promoted the highest removal of acetic acid (89%) with minimal losses of fermentable sugars. Regarding dark fermentation experiments, central composite designs were used to optimize COD and pH variables for both substrates, undetoxified and detoxified hydrolysates (activated carbon 1% p/v and pH 0.6). At optimal conditions, the detoxified hydrolysate produced 33% more biohydrogen than the undetoxified one. Hydrogen molar yields were 1.71 and 1.23 mol H2/molsugar, respectively. This improvement was correlated to changes in metabolic byproducts, since the detoxified hydrolysate produced only acetic and butyric acids, while lactic acid was detected in the undetoxified hydrolysate.
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Affiliation(s)
- B Estela Valdez-Guzmán
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jalisco, Mexico
| | - E Emilia Rios-Del Toro
- División de Procesos Industriales, Universidad Tecnológica de Jalisco, Luis J. Jiménez 577-1° de Mayo, C.P. 44979, Guadalajara, Jalisco, Mexico
| | - Rosa L Cardenas-López
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jalisco, Mexico
| | - Hugo O Méndez-Acosta
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jalisco, Mexico
| | - Víctor González-Álvarez
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jalisco, Mexico
| | - Jorge Arreola-Vargas
- División de Procesos Industriales, Universidad Tecnológica de Jalisco, Luis J. Jiménez 577-1° de Mayo, C.P. 44979, Guadalajara, Jalisco, Mexico.
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Giacobbe S, Piscitelli A, Raganati F, Lettera V, Sannia G, Marzocchella A, Pezzella C. Butanol production from laccase-pretreated brewer's spent grain. Biotechnol Biofuels 2019; 12:47. [PMID: 30867680 PMCID: PMC6399911 DOI: 10.1186/s13068-019-1383-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 02/20/2019] [Indexed: 05/15/2023]
Abstract
BACKGROUND Beer is the most popular alcoholic beverage worldwide. In the manufacture of beer, various by-products and residues are generated, and the most abundant (85% of total by-products) are spent grains. Thanks to its high (hemi)cellulose content (about 50% w/w dry weight), this secondary raw material is attractive for the production of second-generation biofuels as butanol through fermentation processes. RESULTS This study reports the ability of two laccase preparations from Pleurotus ostreatus to delignify and detoxify milled brewer's spent grains (BSG). Up to 94% of phenols reduction was achieved. Moreover, thanks to the mild conditions of enzymatic pretreatment, the formation of other inhibitory compounds was avoided allowing to apply the sequential enzymatic pretreatment and hydrolysis process (no filtration and washing steps between the two phases). As expected, the high detoxification and delignification yields achieved by laccase pretreatment resulted in great saccharification. As a fact, no loss of carbohydrates was observed thanks to the novel sequential strategy, and thus the totality of polysaccharides was hydrolysed into fermentable sugars. The enzymatic hydrolysate was fermented to acetone-butanol-ethanol (ABE) by Clostridium acetobutilycum obtaining about 12.6 g/L ABE and 7.83 g/L butanol within 190 h. CONCLUSIONS The applied sequential pretreatment and hydrolysis process resulted to be very effective for the milled BSG, allowing reduction of inhibitory compounds and lignin content with a consequent efficient saccharification. C. acetobutilycum was able to ferment the BSG hydrolysate with ABE yields similar to those obtained by using synthetic media. The proposed strategy reduces the amount of wastewater and the cost of the overall process. Based on the reported results, the potential production of butanol from the fermentation of BSG hydrolysate can be envisaged.
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Affiliation(s)
| | - Alessandra Piscitelli
- Biopox srl, Via Salita Arenella 9, Naples, Italy
- Dipartimento di Scienze chimiche, Università degli Studi di Napoli“Federico II”, Via Cintia 4, 80126 Naples, Italy
| | - Francesca Raganati
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli “Federico II”, P.le V. Tecchio 80, 80125 Naples, Italy
| | | | - Giovanni Sannia
- Biopox srl, Via Salita Arenella 9, Naples, Italy
- Dipartimento di Scienze chimiche, Università degli Studi di Napoli“Federico II”, Via Cintia 4, 80126 Naples, Italy
| | - Antonio Marzocchella
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli “Federico II”, P.le V. Tecchio 80, 80125 Naples, Italy
| | - Cinzia Pezzella
- Biopox srl, Via Salita Arenella 9, Naples, Italy
- Dipartimento di Scienze chimiche, Università degli Studi di Napoli“Federico II”, Via Cintia 4, 80126 Naples, Italy
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Cunha JT, Romaní A, Costa CE, Sá-Correia I, Domingues L. Molecular and physiological basis of Saccharomyces cerevisiae tolerance to adverse lignocellulose-based process conditions. Appl Microbiol Biotechnol 2018; 103:159-175. [PMID: 30397768 DOI: 10.1007/s00253-018-9478-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 10/19/2018] [Accepted: 10/22/2018] [Indexed: 11/27/2022]
Abstract
Lignocellulose-based biorefineries have been gaining increasing attention to substitute current petroleum-based refineries. Biomass processing requires a pretreatment step to break lignocellulosic biomass recalcitrant structure, which results in the release of a broad range of microbial inhibitors, mainly weak acids, furans, and phenolic compounds. Saccharomyces cerevisiae is the most commonly used organism for ethanol production; however, it can be severely distressed by these lignocellulose-derived inhibitors, in addition to other challenging conditions, such as pentose sugar utilization and the high temperatures required for an efficient simultaneous saccharification and fermentation step. Therefore, a better understanding of the yeast response and adaptation towards the presence of these multiple stresses is of crucial importance to design strategies to improve yeast robustness and bioconversion capacity from lignocellulosic biomass. This review includes an overview of the main inhibitors derived from diverse raw material resultants from different biomass pretreatments, and describes the main mechanisms of yeast response to their presence, as well as to the presence of stresses imposed by xylose utilization and high-temperature conditions, with a special emphasis on the synergistic effect of multiple inhibitors/stressors. Furthermore, successful cases of tolerance improvement of S. cerevisiae are highlighted, in particular those associated with other process-related physiologically relevant conditions. Decoding the overall yeast response mechanisms will pave the way for the integrated development of sustainable yeast cell-based biorefineries.
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Affiliation(s)
- Joana T Cunha
- Centre of Biological Engineering (CEB), University of Minho, 4710-057, Braga, Portugal
| | - Aloia Romaní
- Centre of Biological Engineering (CEB), University of Minho, 4710-057, Braga, Portugal
| | - Carlos E Costa
- Centre of Biological Engineering (CEB), University of Minho, 4710-057, Braga, Portugal
| | - Isabel Sá-Correia
- Institute for Bioengineering and Biosciences, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - Lucília Domingues
- Centre of Biological Engineering (CEB), University of Minho, 4710-057, Braga, Portugal.
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Saha BC, Kennedy GJ, Bowman MJ, Qureshi N, Dunn RO. Factors Affecting Production of Itaconic Acid from Mixed Sugars by Aspergillus terreus. Appl Biochem Biotechnol 2019; 187:449-60. [PMID: 29974379 DOI: 10.1007/s12010-018-2831-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 06/25/2018] [Indexed: 12/11/2022]
Abstract
Itaconic acid (IA; a building block platform chemical) is currently produced industrially from glucose by fermentation with Aspergillus terreus. In order to expand the use of IA, its production cost must be lowered. Lignocellulosic biomass has the potential to serve as low-cost source of sugars for IA production. It was found that the fungus cannot produce IA from dilute acid pretreated and enzymatically saccharified wheat straw hydrolysate even at 100-fold dilution. The effects of typical compounds (acetic acid, furfural, HMF and Mn2+, enzymes, CaSO4), culture conditions (initial pH, temperature, aeration), and medium components (KH2PO4, NH4NO3, CaCl2·2H2O, FeCl3·6H2O) on growth and IA production by A. terreus NRRL 1972 using mixed sugar substrate containing glucose, xylose, and arabinose (4:3:1, 80 g L-1) mimicking the wheat straw hydrolysate were investigated. Acetic acid, furfural, Mn2+, and enzymes were strong inhibitors to both growth and IA production from mixed sugars. Optimum culture conditions (pH 3.1, 33 °C, 200 rpm) and medium components (0.8 g KH2PO4, 3 g NH4NO3, 2.0 g CaCl2·2H2O, 0.83-3.33 mg FeCl3·6H2O per L) as well as tolerable levels of inhibitors (0.4 g acetic acid, < 0.1 g furfural, 100 mg HMF, < 5.0 ppb Mn2+, 24 mg CaSO4 per L) for mixed sugar utilization were established. The results will be highly useful for developing a bioprocess technology for IA production from lignocellulosic feedstocks.
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Wang B, Rezenom YH, Cho KC, Tran JL, Lee DG, Russell DH, Gill JJ, Young R, Chu KH. Cultivation of lipid-producing bacteria with lignocellulosic biomass: effects of inhibitory compounds of lignocellulosic hydrolysates. Bioresour Technol 2014; 161:162-70. [PMID: 24698742 PMCID: PMC7702278 DOI: 10.1016/j.biortech.2014.02.133] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 02/22/2014] [Accepted: 02/25/2014] [Indexed: 05/04/2023]
Abstract
Lignocellulosic biomass has been recognized as a promising feedstock for the fermentative production of biofuel. However, the pretreatment of lignocellulose generates a number of by-products, such as furfural, 5-hydroxylmethyl furfural (5-HMF), vanillin, vanillic acids and trans-p-coumaric acid (TPCA), which are known to inhibit microbial growth. This research explores the ability of Rhodococcus opacus PD630 to use lignocellulosic biomass for production of triacylglycerols (TAGs), a common lipid raw material for biodiesel production. This study reports that R. opacus PD630 can grow well in R2A broth in the presence of these model inhibitory compounds while accumulating TAGs. Furthermore, strain PD630 can use TPCA, vanillic acid, and vanillin as carbon sources, but can only use TPCA and vanillic acid for TAG accumulation. Strain PD630 can also grow rapidly on the hydrolysates of corn stover, sorghum, and grass to accumulate TAGs, suggesting that strain PD630 is well-suited for bacterial lipid production from lignocellulosic biomass.
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Affiliation(s)
- Baixin Wang
- Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Yohannes H Rezenom
- Department of Chemistry, Texas A&M University, College Station, TX 77843-3136, USA
| | - Kun-Ching Cho
- Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Janessa L Tran
- Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA
| | - Do Gyun Lee
- Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA
| | - David H Russell
- Department of Chemistry, Texas A&M University, College Station, TX 77843-3136, USA
| | - Jason J Gill
- Center for Phage Technology, Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-3136, USA
| | - Ryland Young
- Center for Phage Technology, Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-3136, USA
| | - Kung-Hui Chu
- Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843, USA.
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Toquero C, Bolado S. Effect of four pretreatments on enzymatic hydrolysis and ethanol fermentation of wheat straw. Influence of inhibitors and washing. Bioresour Technol 2014; 157:68-76. [PMID: 24531149 DOI: 10.1016/j.biortech.2014.01.090] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 01/18/2014] [Accepted: 01/21/2014] [Indexed: 05/16/2023]
Abstract
Pretreatment is essential in the production of alcohol from lignocellulosic material. In order to increase enzymatic sugar release and bioethanol production, thermal, dilute acid, dilute basic and alkaline peroxide pretreatments were applied to wheat straw. Compositional changes in pretreated solid fractions and sugars and possible inhibitory compounds released in liquid fractions were analysed. SEM analysis showed structural changes after pretreatments. Enzymatic hydrolysis and fermentation by Pichia stipitis of unwashed and washed samples from each pretreatment were performed so as to compare sugar and ethanol yields. The effect of the main inhibitors found in hydrolysates (formic acid, acetic acid, 5-hydroxymethylfurfural and furfural) was first studied through ethanol fermentations of model media and then compared to real hydrolysates. Hydrolysates of washed alkaline peroxide pretreated biomass provided the highest sugar concentrations, 31.82g/L glucose, and 13.75g/L xylose, their fermentation yielding promising results, with ethanol concentrations reaching 17.37g/L.
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Affiliation(s)
- Cristina Toquero
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain
| | - Silvia Bolado
- Department of Chemical Engineering and Environmental Technology, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
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Hatano KI, Aoyagi N, Miyakawa T, Tanokura M, Kubota K. Evaluation of nonionic adsorbent resins for removal of inhibitory compounds from corncob hydrolysate for ethanol fermentation. Bioresour Technol 2013; 149:541-545. [PMID: 24094738 DOI: 10.1016/j.biortech.2013.08.166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 08/09/2013] [Accepted: 08/12/2013] [Indexed: 06/02/2023]
Abstract
The aim of this study was to investigate the effect of XAD4-column treatment on removal of several fermentation inhibitors from corncob hydrolysate (CH). From analysis using a model hydrolysate, more than 99% of 5-hydroxy-methyl furfural, furfural and vanillin were removed by this treatment, and more than 97% of the total xylose, glucose and arabinose remained in the detoxified CH (DCH). The resulting DCH was tested as a substrate for ethanol production by Saccharomyces cerevisiae and Pichia stipitis. The highest ethanol levels for S. cerevisiae were 1.40 and 4.92 g l(-1) in CH and DCH, respectively. For P. stipitis, the levels were 0 and 4.73 g l(-1) in the CH and DCH media, respectively. The levels of alcohol volumetric productivity in the DCH medium were 0.374 and 0.200 g l(-1)h(-1) for S. cerevisiae and P. stipitis, respectively.
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Affiliation(s)
- Ken-ichi Hatano
- Division of Molecular and Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma 376-8515, Japan.
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