301
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Dai K, Zhang F, Zhang Y, Zeng RJ. The chemostat metabolite spectra of alkaline mixed culture fermentation under mesophilic, thermophilic, and extreme-thermophilic conditions. BIORESOURCE TECHNOLOGY 2018; 249:322-327. [PMID: 29054062 DOI: 10.1016/j.biortech.2017.10.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/06/2017] [Accepted: 10/08/2017] [Indexed: 06/07/2023]
Abstract
Alkaline mixed culture fermentation (MCF) is a promising technology for reducing organic waste and producing biochemicals. However, chemostat metabolite spectra that are necessary for constructing a model and analyzing factors are seldom reported. In the present study, the effects of pH on the metabolites distribution in mesophilic (35 °C), thermophilic (55 °C), and extreme-thermophilic (70 °C) alkaline MCF were demonstrated. A chemical oxygen demand balance above 80% was achieved, and the main metabolites included acetate, ethanol, propionate, lactate, and formate. The yields of ethanol and formate increased as pH was increased from 7.5 to higher pH under mesophilic and thermophilic conditions, while the yields of acetate, lactate, and/or propionate decreased. The yields of ethanol, acetate, and formate increased under extreme-thermophilic conditions as pH was increased from 7.5 to 9.0, whereas lactate and hydrogen yields decreased. Low biomass yield under thermophilic and extreme-thermophilic conditions benefited higher metabolite production and minimized the accumulation of sludge.
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Affiliation(s)
- Kun Dai
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China
| | - Fang Zhang
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, People's Republic of China; CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Yan Zhang
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Raymond Jianxiong Zeng
- CAS Key Laboratory for Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.
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302
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Morgan HM, Xie W, Liang J, Mao H, Lei H, Ruan R, Bu Q. A techno-economic evaluation of anaerobic biogas producing systems in developing countries. BIORESOURCE TECHNOLOGY 2018; 250:910-921. [PMID: 29246720 DOI: 10.1016/j.biortech.2017.12.013] [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: 10/27/2017] [Revised: 12/03/2017] [Accepted: 12/06/2017] [Indexed: 06/07/2023]
Abstract
Biogas production has been the focus of many individuals in the developing world; there have been several investigations that focus on improving the production process and product quality. In the developing world the lack of advanced technology and capital has hindered the development of energy production. Renewable energy has the potential to improve the standard of living for most of the 196 countries which are classified as developing economies. One of the easiest renewable energy compounds that can be produced is biogas (bio-methane). Biogas can be produced from almost any source of biomass through the anaerobic respiration of micro-organisms. Low budget energy systems are reviewed in this article along with various feedstock sources. Adapted gas purification and storage systems are also reviewed, along with the possible economic, social, health and environmental benefits of its implementation.
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Affiliation(s)
- Hervan Marion Morgan
- School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China
| | - Wei Xie
- School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China
| | - Jianghui Liang
- School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China
| | - Hanping Mao
- School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China
| | - Hanwu Lei
- Bioproducts, Sciences and Engineering Laboratory, Department of Biological Systems Engineering, Washington State University, Richland, WA 99354-1671, USA
| | - Roger Ruan
- Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Quan Bu
- School of Agricultural Equipment Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province 212013, PR China.
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303
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Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis. Sci Rep 2018; 8:1321. [PMID: 29358729 PMCID: PMC5778052 DOI: 10.1038/s41598-018-19517-5] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 01/03/2018] [Indexed: 12/02/2022] Open
Abstract
Wheat straw (WS) is a potential biomass for production of monomeric sugars. However, the enzymatic hydrolysis ratio of cellulose in WS is relatively low due to the presence of lignin and hemicellulose. To enhance the enzymatic conversion of WS, we tested the impact of three different pretreatments, e.g. sulfuric acid (H2SO4), sodium hydroxide (NaOH), and hot water pretreatments to the enzymatic digestions. Among the three pretreatments, the highest cellulose conversion rate was obtained with the 4% NaOH pretreatment at 121 °C (87.2%). In addition, NaOH pretreatment was mainly effective in removing lignin, whereas the H2SO4 pretreatment efficiently removed hemicellulose. To investigate results of pretreated process for enhancement of enzyme-hydolysis to the WS, we used scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy to analyze structural changes of raw and treated materials. The structural analysis indicated that after H2SO4 and NaOH pretreatments, most of the amorphous cellulose and partial crystalline cellulose were hydrolyzed during enzymatic hydrolysis. The findings of the present study indicate that WS could be ideal materials for production of monomeric sugars with proper pretreatments and effective enzymatic base hydrolysis.
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304
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Zhang K, Di YN, Qi L, Sui Y, Wang TY, Fan L, Lv ZM, Wu XC, Wang PM, Zheng DQ. Genetic characterization and modification of a bioethanol-producing yeast strain. Appl Microbiol Biotechnol 2018; 102:2213-2223. [PMID: 29333587 DOI: 10.1007/s00253-017-8727-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 12/16/2017] [Accepted: 12/18/2017] [Indexed: 10/18/2022]
Abstract
Yeast Saccharomyces cerevisiae strains isolated from different sources generally show extensive genetic and phenotypic diversity. Understanding how genomic variations influence phenotypes is important for developing strategies with improved economic traits. The diploid S. cerevisiae strain NY1308 is used for cellulosic bioethanol production. Whole genome sequencing identified an extensive amount of single nucleotide variations and small insertions/deletions in the genome of NY1308 compared with the S288c genome. Gene annotation of the assembled NY1308 genome showed that 43 unique genes are absent in the S288c genome. Phylogenetic analysis suggested most of the unique genes were obtained through horizontal gene transfer from other species. RNA-Seq revealed that some unique genes were not functional in NY1308 due to unidentified intron sequences. During bioethanol fermentation, NY1308 tends to flocculate when certain inhibitors (derived from the pretreatment of cellulosic feedstock) are present in the fermentation medium. qRT-PCR and genetic manipulation confirmed that the novel gene, NYn43, contributed to the flocculation ability of NY1308. Deletion of NYn43 resulted in a faster fermentation rate for NY1308. This work disclosed the genetic characterization of a bioethanol-producing S. cerevisiae strain and provided a useful paradigm showing how the genetic diversity of the yeast population would facilitate the personalized development of desirable traits.
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Affiliation(s)
- Ke Zhang
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China
| | - Ya-Nan Di
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Lei Qi
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Yang Sui
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Ting-Yu Wang
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Li Fan
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Zhen-Mei Lv
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China
| | - Xue-Chang Wu
- Institute of Microbiology, College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China
| | - Pin-Mei Wang
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Dao-Qiong Zheng
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China.
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305
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In Silico Identification of Microbial Partners to Form Consortia with Anaerobic Fungi. Processes (Basel) 2018. [DOI: 10.3390/pr6010007] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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306
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Abd‐Aziz S, Ibrahim MF, Jenol MA. Biological Pretreatment of Lignocellulosic Biomass for Volatile Fatty Acid Production. EMERGING AREAS IN BIOENGINEERING 2018:191-201. [DOI: 10.1002/9783527803293.ch11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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307
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Wyman V, Henríquez J, Palma C, Carvajal A. Lignocellulosic waste valorisation strategy through enzyme and biogas production. BIORESOURCE TECHNOLOGY 2018; 247:402-411. [PMID: 28961446 DOI: 10.1016/j.biortech.2017.09.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 09/05/2017] [Accepted: 09/06/2017] [Indexed: 05/25/2023]
Abstract
Lignocellulosic wastes are generally pre-treated to facilitate the hydrolysis stage during the anaerobic digestion process. A process consisting of solid state fermentation carried out by white rot fungi and anaerobic digestion was evaluated on corn stover to produce ligninolytic enzymes and biogas. The enzyme production was quantified every 3d for a month at 30°C, and three fungal strains and two particle sizes of waste were compared. Of the main outcomes, Pleurotus eryngii produced the highest laccase enzyme activity compared with Pleurotus ostreatus and Trametes versicolor. Furthermore, this activity was improved by 16% when copper was used as an enzyme inducer. On the other hand, most of the conditions studied showed a decrease in maximum biogas production compared with untreated waste, the addition of copper decreased biogas production by 20%. Despite the above, Pleurotus eryngii showed promising results allowing a 19% increase of biogas production and high enzyme production values.
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Affiliation(s)
- Valentina Wyman
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, Santiago, Chile
| | - Josefa Henríquez
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, Santiago, Chile
| | - Carolyn Palma
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, Santiago, Chile
| | - Andrea Carvajal
- Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Av. Vicuña Mackenna 3939, Santiago, Chile.
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308
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Wang Y, Shao Y, Zou X, Yang M, Guo L. Synergistic action between extracellular products from white-rot fungus and cellulase significantly improves enzymatic hydrolysis. Bioengineered 2018; 9:178-185. [PMID: 28384075 PMCID: PMC5972936 DOI: 10.1080/21655979.2017.1308991] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
With a set of perfect extracellular lignocellulolytic enzymes, white-rot fungus has been recognized as playing an important role in the degradation of lignocellulose materials, which leads to the possibility of creating a composite enzymatic system with high hydrolysis efficiency in vitro. Echinodontium taxodii is a promising white-rot fungus for biologic pretreatment. In this study, we extracted the extracellular products of E. taxodii under solid-state fermentation conditions, mixed the extracellular products with cellulase to build a composite enzymatic system, and systematically evaluated the effect of this system on the hydrolysis of acid-pretreated and raw maize stovers. We found that the extracellular products from E. taxodii could significantly improve the hydrolysis efficiency of cellulase, with a synergistic action between the extracellular products and cellulase. Corn stovers treated with extracellular products were suitable for the enzymatic hydrolysis of cellulase. Furthermore, we found that pure proteins from the extracellular products were not sufficient to generate synergistic action. This finding suggests that non-protein substances may also be involved in the synergistic action between the extracellular products and cellulase.
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Affiliation(s)
- Yushan Wang
- a Department of Biotechnology , Heilongjiang Vocational Institute of Ecological Engineering, Heilongjiang Province , China
| | - Yang Shao
- a Department of Biotechnology , Heilongjiang Vocational Institute of Ecological Engineering, Heilongjiang Province , China
| | - Xinyue Zou
- a Department of Biotechnology , Heilongjiang Vocational Institute of Ecological Engineering, Heilongjiang Province , China
| | - Mandi Yang
- a Department of Biotechnology , Heilongjiang Vocational Institute of Ecological Engineering, Heilongjiang Province , China
| | - Lin Guo
- a Department of Biotechnology , Heilongjiang Vocational Institute of Ecological Engineering, Heilongjiang Province , China
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309
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Yoav S, Salame TM, Feldman D, Levinson D, Ioelovich M, Morag E, Yarden O, Bayer EA, Hadar Y. Effects of cre1 modification in the white-rot fungus Pleurotus ostreatus PC9: altering substrate preference during biological pretreatment. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:212. [PMID: 30065786 PMCID: PMC6062969 DOI: 10.1186/s13068-018-1209-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 07/18/2018] [Indexed: 05/16/2023]
Abstract
BACKGROUND During the process of bioethanol production, cellulose is hydrolyzed into its monomeric soluble units. For efficient hydrolysis, a chemical and/or mechanical pretreatment step is required. Such pretreatment is designed to increase enzymatic digestibility of the cellulose chains inter alia by de-crystallization of the cellulose chains and by removing barriers, such as lignin from the plant cell wall. Biological pretreatment, in which lignin is decomposed or modified by white-rot fungi, has also been considered. One disadvantage in biological pretreatment, however, is the consumption of the cellulose by the fungus. Thus, fungal species that attack lignin with only minimal cellulose loss are advantageous. The secretomes of white-rot fungi contain carbohydrate-active enzymes (CAZymes) including lignin-modifying enzymes. Thus, modification of secretome composition can alter the ratio of lignin/cellulose degradation. RESULTS Pleurotus ostreatus PC9 was genetically modified to either overexpress or eliminate (by gene replacement) the transcriptional regulator CRE1, known to act as a repressor in the process of carbon catabolite repression. The cre1-overexpressing transformant demonstrated lower secreted cellulolytic activity and slightly increased selectivity (based on the chemical composition of pretreated wheat straw), whereas the knockout transformant demonstrated increased cellulolytic activity and significantly reduced residual cellulose, thereby displaying lower selectivity. Pretreatment of wheat straw using the wild-type PC9 resulted in 2.8-fold higher yields of soluble sugar compared to untreated wheat straw. The overexpression transformant showed similar yields (2.6-fold), but the knockout transformant exhibited lower yields (1.2-fold) of soluble sugar. Based on proteomic secretome analysis, production of numerous CAZymes was affected by modification of the expression level of cre1. CONCLUSIONS The gene cre1 functions as a regulator for expression of fungal CAZymes active against plant cell wall lignocelluloses, hence altering the substrate preference of the fungi tested. While the cre1 knockout resulted in a less efficient biological pretreatment, i.e., less saccharification of the treated biomass, the converse manipulation of cre1 (overexpression) failed to improve efficiency. Despite the inverse nature of the two genetic alterations, the expected "mirror image" (i.e., opposite regulatory response) was not observed, indicating that the secretion level of CAZymes, was not exclusively dependent on CRE1 activity.
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Affiliation(s)
- Shahar Yoav
- Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100 Israel
| | - Tomer M. Salame
- Flow Cytometry Unit, Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, 76100 Israel
| | - Daria Feldman
- Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100 Israel
| | - Dana Levinson
- Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100 Israel
| | | | - Ely Morag
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, 76100 Israel
| | - Oded Yarden
- Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100 Israel
| | - Edward A. Bayer
- Department of Biomolecular Sciences, The Weizmann Institute of Science, Rehovot, 76100 Israel
| | - Yitzhak Hadar
- Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, 76100 Israel
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310
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Qin X, Su X, Luo H, Ma R, Yao B, Ma F. Deciphering lignocellulose deconstruction by the white rot fungus Irpex lacteus based on genomic and transcriptomic analyses. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:58. [PMID: 29507610 PMCID: PMC5833081 DOI: 10.1186/s13068-018-1060-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Accepted: 02/23/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND Irpex lacteus is one of the most potent white rot fungi for biological pretreatment of lignocellulose for second biofuel production. To elucidate the underlying molecular mechanism involved in lignocellulose deconstruction, genomic and transcriptomic analyses were carried out for I. lacteus CD2 grown in submerged fermentation using ball-milled corn stover as the carbon source. RESULTS Irpex lacteus CD2 efficiently decomposed 74.9% lignin, 86.3% cellulose, and 83.5% hemicellulose in corn stover within 9 days. Manganese peroxidases were rapidly induced, followed by accumulation of cellulase and hemicellulase. Genomic analysis revealed that I. lacteus CD2 possessed a complete set of lignocellulose-degrading enzyme system composed mainly of class II peroxidases, dye-decolorizing peroxidases, auxiliary enzymes, and 182 glycoside hydrolases. Comparative transcriptomic analysis substantiated the notion of a selection mode of degradation. These analyses also suggested that free radicals, derived either from MnP-organic acid interplay or from Fenton reaction involving Fe2+ and H2O2, could play an important role in lignocellulose degradation. CONCLUSIONS The selective strategy employed by I. lacteus CD2, in combination with low extracellular glycosidases cleaving plant cell wall polysaccharides into fermentable sugars, may account for high pretreatment efficiency of I. lacteus. Our study also hints the importance of free radicals for future designing of novel, robust lignocellulose-degrading enzyme cocktails.
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Affiliation(s)
- Xing Qin
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Beijing, 100081 People’s Republic of China
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074 People’s Republic of China
| | - Xiaoyun Su
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Beijing, 100081 People’s Republic of China
| | - Huiying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Beijing, 100081 People’s Republic of China
| | - Rui Ma
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Beijing, 100081 People’s Republic of China
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 South Zhongguancun Street, Beijing, 100081 People’s Republic of China
| | - Fuying Ma
- College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074 People’s Republic of China
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311
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Lara-Flores AA, Araújo RG, Rodríguez-Jasso RM, Aguedo M, Aguilar CN, Trajano HL, Ruiz HA. Bioeconomy and Biorefinery: Valorization of Hemicellulose from Lignocellulosic Biomass and Potential Use of Avocado Residues as a Promising Resource of Bioproducts. ENERGY, ENVIRONMENT, AND SUSTAINABILITY 2018. [DOI: 10.1007/978-981-10-7431-8_8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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312
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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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313
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Satari B, Karimi K. Mucoralean fungi for sustainable production of bioethanol and biologically active molecules. Appl Microbiol Biotechnol 2017; 102:1097-1117. [DOI: 10.1007/s00253-017-8691-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 12/01/2017] [Accepted: 12/02/2017] [Indexed: 11/27/2022]
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314
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Larsen SU, Hjort-Gregersen K, Vazifehkhoran AH, Triolo JM. Co-ensiling of straw with sugar beet leaves increases the methane yield from straw. BIORESOURCE TECHNOLOGY 2017; 245:106-115. [PMID: 28892679 DOI: 10.1016/j.biortech.2017.08.117] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 08/17/2017] [Accepted: 08/18/2017] [Indexed: 06/07/2023]
Abstract
This study examined the effect of co-ensiling of wheat straw and sugar beet leaves on the biochemical methane potential (BMP) by both lab-scale and pilot-scale co-ensiling. BMP was increased by co-ensiling, and the increase ranged from 19 to 34% after 9months of co-ensiling in lab-scale and from 18 to 32% after 6months of co-ensiling in pilot-scale. No effluent run-off was found through pilot-scale co-ensiling and there was a mass loss of only 0.1%. The study demonstrates that co-ensiling of straw and green biomass has potential as biological pretreatment and for avoiding effluent run-off from pure beet leave silage.
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Affiliation(s)
- Søren Ugilt Larsen
- Danish Technological Institute, Agro Food Park 15, DK-8200 Aarhus N, Denmark
| | | | - Ali Heidarzadeh Vazifehkhoran
- University of Southern Denmark, Department of Chemical Engineering, Biotechnology and Environmental Technology, Campusvej 55, DK-5230 Odense M, Denmark
| | - Jin Mi Triolo
- University of Southern Denmark, Department of Chemical Engineering, Biotechnology and Environmental Technology, Campusvej 55, DK-5230 Odense M, Denmark.
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315
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Paudel SR, Banjara SP, Choi OK, Park KY, Kim YM, Lee JW. Pretreatment of agricultural biomass for anaerobic digestion: Current state and challenges. BIORESOURCE TECHNOLOGY 2017; 245:1194-1205. [PMID: 28899674 DOI: 10.1016/j.biortech.2017.08.182] [Citation(s) in RCA: 101] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 08/25/2017] [Accepted: 08/29/2017] [Indexed: 05/25/2023]
Abstract
The anaerobic digestion (AD) of agricultural biomass is an attractive second generation biofuel with potential environmental and economic benefits. Most agricultural biomass contains lignocellulose which requires pretreatment prior to AD. For optimization, the pretreatment methods need to be specific to the characteristics of the biomass feedstock. In this review, cereal residue, fruit and vegetable wastes, grasses and animal manure were selected as the agricultural biomass candidates, and the fundamentals and current state of various pretreatment methods used for AD of these feedstocks were investigated. Several nonconventional methods (electrical, ionic liquid-based chemicals, ruminant biological pretreatment) offer potential as targeted pretreatments of lignocellulosic biomass, but each comes with its own challenges. Pursuing an energy-intensive route, a combined bioethanol-biogas production could be a promising a second biofuel refinery option, further emphasizing the importance of pretreatment when lignocellulosic feedstock is used.
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Affiliation(s)
- Shukra Raj Paudel
- Department of Civil Engineering, Pulchowk Campus, Institute of Engineering, Tribhuvan University, Pulchowk, Lalitpur, Nepal
| | - Sushant Prasad Banjara
- School of Forestry and Environmental Studies, Yale University, 195 Prospect St, New Haven, CT 06511, USA
| | - Oh Kyung Choi
- Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 30019, Republic of Korea
| | - Ki Young Park
- Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, Republic of Korea
| | - Young Mo Kim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Jae Woo Lee
- Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong 30019, Republic of Korea.
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316
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Yan X, Wang Z, Zhang K, Si M, Liu M, Chai L, Liu X, Shi Y. Bacteria-enhanced dilute acid pretreatment of lignocellulosic biomass. BIORESOURCE TECHNOLOGY 2017; 245:419-425. [PMID: 28898839 DOI: 10.1016/j.biortech.2017.08.037] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 08/07/2017] [Accepted: 08/08/2017] [Indexed: 06/07/2023]
Abstract
Pretreatment is indispensable for the large-scale and low-cost bio-products production from lignocellulosic biomass. Herein, a new bacteria-enhanced dilute acid pretreatment (BE-DAP) strategy was introduced. Cupriavidus basilensis B-8 as a potential bacterium for lignin degradation was employed. Multi-scale characterizations on the physicochemical structure of rice straw indicated that Cupriavidus basilensis B-8 could act on the lignin droplets formed in dilute acid pretreatment (DAP), and dig out these droplets to recover cracks and holes on rice straw surface, leaving an opened and porous structure for the easy access of enzyme to inner cellulose. Eventually, the enzymatic digestibility of RS was increased by 35-70% and 173-244% in BE-DAP compared to DAP pretreated and untreated RS, respectively. The BE-DAP strategy, as well as its physicochemical mechanism, opened new perspectives for lignocellulose pretreatment.
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Affiliation(s)
- Xu Yan
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China; School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Zhongren Wang
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Kejing Zhang
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Mengying Si
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Mingren Liu
- School of Metallurgy and Environment, Central South University, Changsha 410083, China
| | - Liyuan Chai
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China
| | - Xueduan Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
| | - Yan Shi
- School of Metallurgy and Environment, Central South University, Changsha 410083, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha 410083, China.
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317
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Pinar O, Karaosmanoğlu K, Sayar NA, Kula C, Kazan D, Sayar AA. Assessment of hazelnut husk as a lignocellulosic feedstock for the production of fermentable sugars and lignocellulolytic enzymes. 3 Biotech 2017; 7:367. [PMID: 29062677 DOI: 10.1007/s13205-017-1002-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 09/26/2017] [Indexed: 12/22/2022] Open
Abstract
The present work focuses firstly on the evaluation of the effect of laccase on enzymatic hydrolysis of hazelnut husk which is one of the most abundant lignocellulosic agricultural residues generated in Turkey. In this respect, the co-enzymatic treatment of hazelnut husk by cellulase and laccase, without a conventional pretreatment step is evaluated. Using 2.75 FPU/g substrate (40 g/L substrate) and a ratio of 131 laccase U/FPU achieved the highest reducing sugars concentration. Gas chromatography mass spectrometry confirmed that the hydrolysate was composed of glucose, xylose, mannose, arabinose and galactose. The inclusion of laccase in the enzyme mixture [carboxymethyl cellulase (CMCase) and β-glucosidase] increased the final glucose content of the reducing sugars from 20 to 50%. Therefore, a very significant increase in glucose content of the final reducing sugars concentration was obtained by laccase addition. Furthermore, the production of cellulases and laccase by Pycnoporus sanguineus DSM 3024 using hazelnut husk as substrate was also investigated. Among the hazelnut husk concentrations tested (1.5, 6, 12, 18 g/L), the highest CMCase concentration was obtained using 12 g/L husk concentration on the 10th day of fermentation. Besides CMCase, P. sanguineus DSM 3024 produced β-glucosidase and laccase using hazelnut husk as carbon source. In addition to CMCase and β-glucosidase, the highest laccase activity measured was 2240 ± 98 U/L (8.89 ± 0.39 U/mg). To the best of our knowledge, this is the first study to report hazelnut husk hydrolysis in the absence of pretreatment procedures.
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Affiliation(s)
- Orkun Pinar
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
| | - Kübra Karaosmanoğlu
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
| | - Nihat Alpagu Sayar
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
| | - Ceyda Kula
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
| | - Dilek Kazan
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
| | - Ahmet Alp Sayar
- Department of Bioengineering, Faculty of Engineering, Marmara University, Göztepe Campus, Kadıköy, 34722 Istanbul, Turkey
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318
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Guo H, Wu Y, Hong C, Chen H, Chen X, Zheng B, Jiang D, Qin W. Enhancing digestibility of Miscanthus using lignocellulolytic enzyme produced by Bacillus. BIORESOURCE TECHNOLOGY 2017; 245:1008-1015. [PMID: 28946202 DOI: 10.1016/j.biortech.2017.09.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 09/05/2017] [Accepted: 09/06/2017] [Indexed: 05/12/2023]
Abstract
In this study an effective bacterial pretreatment method was developed to improve digestibility of Miscanthus. Seven new bacterial isolates, which showed excellent xylanase production ability using Miscanthus as carbon source, were used to perform the pretreatment experiments. After pretreatment, the hemicellulose content and crystallinity index of Miscanthus were decreased, while the reducing sugars released from Miscanthus were significantly increased by 30.8-87.8% after enzymatic hydrolysis. Bacillus sp. G0 was selected to optimize the pretreatment parameters via response surface methodology due to its high reducing sugars released from Miscanthus. According to the optimal model, the pretreatment parameters were set as citrate buffer/G0 fermentation broth ratio at 0.34, pretreatment time at 100h and Tween-20 concentration at 1.73%. The reducing sugars released from Miscanthus pretreated by optimal parameters were 305mgg-1 dry biomass. The results suggested our bacterial pretreatment approaches have great potential to increase digestibility of bioenergy crops.
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Affiliation(s)
- Haipeng Guo
- Department of Biology, Lakehead University, Thunder Bay, ON P7B 5E1, Canada; State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yanwen Wu
- Department of Biology, Lakehead University, Thunder Bay, ON P7B 5E1, Canada
| | - Chuntao Hong
- Academy of Agricultural Sciences of Ningbo City, Ningbo 315040, China
| | - Houming Chen
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xuantong Chen
- Faculty of Natural Resources Management, Lakehead University, Thunder Bay, ON P7B 5E1, Canada
| | - Bingsong Zheng
- State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou 311300, China
| | - Dean Jiang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Wensheng Qin
- Department of Biology, Lakehead University, Thunder Bay, ON P7B 5E1, Canada.
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319
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Alexandropoulou M, Antonopoulou G, Fragkou E, Ntaikou I, Lyberatos G. Fungal pretreatment of willow sawdust and its combination with alkaline treatment for enhancing biogas production. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 203:704-713. [PMID: 27080567 DOI: 10.1016/j.jenvman.2016.04.006] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 04/01/2016] [Accepted: 04/05/2016] [Indexed: 06/05/2023]
Abstract
In this study fungal pretreatment of willow sawdust (WSD) via the white rot fungi Leiotrametes menziesii and Abortiporus biennis was studied and the effect on fractionation of lignocellulosic biomass and biochemical methane potential (BMP), was evaluated. Scanning electron microscopy (SEM) and IR spectroscopy were used to investigate the changes in the structural characteristics of the pretreated WSD. Fungal pretreatment results revealed that A. biennis is more attractive, since it resulted in higher lignin degradation and lower holocellulose uptake. Samples of the 14th and 30th d of cultivation (i.e. the middle and the end of the pretreatment experiment) with both fungi were used for BMP tests and the effect of pretreatment duration was also evaluated. BMP increase by 31 and 43% was obtained due to the cultivation of WSD with A. biennis, for 14 and 30 d, respectively. In addition, combination of biological (after 30 d of cultivation) with alkaline (NaOH 20 g/100 gTS) pretreatment was performed, in order to assess the effect of the chemical agent on biologically pretreated WSD, in terms of lignocellulosic content and BMP. Combination of alkaline with fungal pretreatment led to high lignin degradation for both fungi, while the cellulose and hemicellulose removal efficiencies were higher for combined alkaline and L. menziesii pretreatment. The maximum BMP was observed for the combined alkaline and A. biennis pretreatment and was 12.5 and 50.1% higher than the respective alkaline and fungal pretreatment alone and 115% higher than the respective BMP of raw WSD.
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Affiliation(s)
- Maria Alexandropoulou
- Institute of Chemical Engineering Sciences, Stadiou, Platani, Patras GR 26504, Greece; School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
| | - Georgia Antonopoulou
- Institute of Chemical Engineering Sciences, Stadiou, Platani, Patras GR 26504, Greece.
| | - Efsevia Fragkou
- Department of Chemical Engineering, University of Patras, Karatheodori 1, Patras GR 26500, Greece
| | - Ioanna Ntaikou
- Institute of Chemical Engineering Sciences, Stadiou, Platani, Patras GR 26504, Greece
| | - Gerasimos Lyberatos
- Institute of Chemical Engineering Sciences, Stadiou, Platani, Patras GR 26504, Greece; School of Chemical Engineering, National Technical University of Athens, GR 15780 Athens, Greece
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320
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Favaro L, Cagnin L, Basaglia M, Pizzocchero V, van Zyl WH, Casella S. Production of bioethanol from multiple waste streams of rice milling. BIORESOURCE TECHNOLOGY 2017; 244:151-159. [PMID: 28779666 DOI: 10.1016/j.biortech.2017.07.108] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/19/2017] [Accepted: 07/20/2017] [Indexed: 05/23/2023]
Abstract
This work describes the feasibility of using rice milling by-products as feedstock for bioethanol. Starch-rich residues (rice bran, broken, unripe and discolored rice) were individually fermented (20%w/v) through Consolidated Bioprocessing by two industrial engineered yeast secreting fungal amylases. Rice husk (20%w/v), mainly composed by lignocellulose, was pre-treated at 55°C with alkaline peroxide, saccharified through optimized dosages of commercial enzymes (Cellic® CTec2) and fermented by the recombinant strains. Finally, a blend of all the rice by-products, formulated as a mixture (20%w/v) according to their proportions at milling plants, were co-processed to ethanol by optimized pre-treatment, saccharification and fermentation by amylolytic strains. Fermenting efficiency for each by-product was high (above 88% of the theoretical) and further confirmed on the blend of residues (nearly 52g/L ethanol). These results demonstrated for the first time that the co-conversion of multiple waste streams is a promising option for second generation ethanol production.
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Affiliation(s)
- Lorenzo Favaro
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), Università di Padova, Agripolis, Viale dell'Università 16, 35020 Legnaro, PD, Italy.
| | - Lorenzo Cagnin
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), Università di Padova, Agripolis, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Marina Basaglia
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), Università di Padova, Agripolis, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Valentino Pizzocchero
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), Università di Padova, Agripolis, Viale dell'Università 16, 35020 Legnaro, PD, Italy
| | - Willem Heber van Zyl
- Department of Microbiology, Stellenbosch University, Private Bag X1, 7602 Matieland, Stellenbosch, South Africa
| | - Sergio Casella
- Department of Agronomy Food Natural resources Animals and Environment (DAFNAE), Università di Padova, Agripolis, Viale dell'Università 16, 35020 Legnaro, PD, Italy
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321
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Naresh Kumar M, Ravikumar R, Thenmozhi S, Kirupa Sankar M. Development of natural cellulase inhibitor mediated intensified biological pretreatment technology using Pleurotus florida for maximum recovery of cellulose from paddy straw under solid state condition. BIORESOURCE TECHNOLOGY 2017; 244:353-361. [PMID: 28780270 DOI: 10.1016/j.biortech.2017.07.105] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 07/19/2017] [Accepted: 07/20/2017] [Indexed: 05/28/2023]
Abstract
Inhibitor mediated intensified bio-pretreatment (IMBP) technology using natural cellulase inhibitor (NCI) for maximum cellulose recovery from paddy straw was studied. Pretreatment was carried out under solid state condition. Supplementation of 8% NCI in pretreatment medium improves cellulose recovery and delignification by 1.2 and 1.5-fold respectively, compared to conventional bio-pretreatment due to inhibition of 61% of cellulase activity in IMBP. Further increase in NCI concentration showed negative effect on Pleurotus florida growth and suppress the laccase productivity by 1.1-fold. Laccase activity in IMBP was found to be 2.0U/mL on 19thday, which is higher than (1.5U/mL) conventional bio-pretreatment. Physico-chemical modifications in paddy straw before and after pretreatment were analysed by SEM, ATR-FTIR, XRD and TGA. According to these findings, the IMBP technology can be a viable eco-friendly technology for sustainable production of bioethanol with maximum cellulose recovery.
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Affiliation(s)
- Manickam Naresh Kumar
- Bioenergy Research Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Erode 638401, TN, India
| | - Rajarathinam Ravikumar
- Bioenergy Research Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Erode 638401, TN, India.
| | - Senniyappan Thenmozhi
- Bioenergy Research Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Erode 638401, TN, India
| | - Muthuvelu Kirupa Sankar
- Bioenergy Research Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Erode 638401, TN, India
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322
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Schroyen M, Van Hulle SWH, Holemans S, Vervaeren H, Raes K. Laccase enzyme detoxifies hydrolysates and improves biogas production from hemp straw and miscanthus. BIORESOURCE TECHNOLOGY 2017; 244:597-604. [PMID: 28803111 DOI: 10.1016/j.biortech.2017.07.137] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 07/21/2017] [Accepted: 07/22/2017] [Indexed: 06/07/2023]
Abstract
The impact of various phenolic compounds, vanillic acid, ferulic acid, p-coumaric acid and 4-hydroxybenzoic acid on anaerobic digestion of lignocellulosic biomass (hemp straw and miscanthus) was studied. Such phenolic compounds have been known to inhibit biogas production during anaerobic digestion. The different phenolic compounds were added in various concentrations: 0, 100, 500, 1000 and 2000mg/L. A difference in inhibition of biomethane production between the phenolic compounds was noted. Hydrolysis rate, during anaerobic digestion of miscanthus was inhibited up to 50% by vanillic acid, while vanillic acid had no influence on the initial rate of biogas production during the anaerobic digestion of hemp straw. Miscanthus has a higher lignin concentration (12-30g/100gDM) making it less accessible for degradation, and in combination with phenolic compounds released after harsh pretreatments, it can cause severe inhibition levels during the anaerobic digestion, lowering biogas production. To counter the inhibition, lignin degrading enzymes can be used to remove or degrade the inhibitory phenolic compounds. The interaction of laccase and versatile peroxidase individually with the different phenolic compounds was studied to have insight in the polymerization of inhibitory compounds or breakdown of lignocellulose. Hemp straw and miscanthus were incubated with 0, 100 and 500mg/L of the different phenolic compounds for 0, 6 and 24h and pretreated with the lignin degrading enzymes. A laccase pretreatment successfully detoxified the substrate, while versatile peroxidase however was inhibited by 100mg/L of each of the individual phenolic compounds. Finally a combination of enzymatic detoxification and subsequent biogas production showed that a decrease in phenolic compounds by laccase treatment can considerably lower the inhibition levels of the biogas production.
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Affiliation(s)
- Michel Schroyen
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Stijn W H Van Hulle
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Sander Holemans
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium
| | - Han Vervaeren
- Department of Applied Analytical and Physical Chemistry, Ghent University, Coupure Links 653, 9000 Gent, Belgium
| | - Katleen Raes
- Department of Industrial Biological Sciences, Faculty of Bioscience Engineering, Ghent University, Campus Kortrijk, Graaf Karel de Goedelaan 5, 8500 Kortrijk, Belgium.
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323
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Sadhukhan J, Martinez-Hernandez E. Material flow and sustainability analyses of biorefining of municipal solid waste. BIORESOURCE TECHNOLOGY 2017; 243:135-146. [PMID: 28651133 DOI: 10.1016/j.biortech.2017.06.078] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 06/13/2017] [Accepted: 06/14/2017] [Indexed: 05/21/2023]
Abstract
This paper presents material flow and sustainability analyses of novel mechanical biological chemical treatment system for complete valorization of municipal solid waste (MSW). It integrates material recovery facility (MRF); pulping, chemical conversion; effluent treatment plant (ETP), anaerobic digestion (AD); and combined heat and power (CHP) systems producing end products: recyclables (24.9% by mass of MSW), metals (2.7%), fibre (1.5%); levulinic acid (7.4%); recyclable water (14.7%), fertiliser (8.3%); and electricity (0.126MWh/t MSW), respectively. Refuse derived fuel (RDF) and non-recyclable other waste, char and biogas from MRF, chemical conversion and AD systems, respectively, are energy recovered in the CHP system. Levulinic acid gives profitability independent of subsidies; MSW priced at 50Euro/t gives a margin of 204Euro/t. Global warming potential savings are 2.4 and 1.3kg CO2 equivalent per kg of levulinic acid and fertiliser, and 0.17kg CO2 equivalent per MJ of grid electricity offset, respectively.
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Affiliation(s)
- Jhuma Sadhukhan
- Centre for Environmental and Sustainability, University of Surrey, GU2 7XH, UK.
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324
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Xie C, Gong W, Yang Q, Zhu Z, Yan L, Hu Z, Peng Y. White-rot fungi pretreatment combined with alkaline/oxidative pretreatment to improve enzymatic saccharification of industrial hemp. BIORESOURCE TECHNOLOGY 2017; 243:188-195. [PMID: 28662388 DOI: 10.1016/j.biortech.2017.06.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Revised: 06/12/2017] [Accepted: 06/13/2017] [Indexed: 06/07/2023]
Abstract
White-rot fungi combined with alkaline/oxidative (A/O) pretreatments of industrial hemp woody core were proposed to improve enzymatic saccharification. In this study, hemp woody core were treated with only white rot fungi, only A/O and combined with the two methods. The results showed that Pleurotus eryngii (P. eryngii) was the most effective fungus for pretreatment. Reducing sugars yield was 329mg/g with 30 Filter Paper Unit (FPU)/g cellulase loading when treated 21day. In the A/O groups, the results showed that when treated with 3% NaOH and 3% H2O2, the yield of reducing sugars was 288mg/g with 30FPU/g cellulase loading. After combination pretreatment with P. eryngii and A/O pretreatment, the reducing sugar yield from enzymatic hydrolysis of combined sample increased 1.10-1.29-fold than that of bio-treated or A/O pretreatment sample at the same conditions, suggesting that P. eryngii combined with A/O pretreatment was an effective method to improve enzyme hydrolysis.
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Affiliation(s)
- Chunliang Xie
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Wenbing Gong
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Qi Yang
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Zuohua Zhu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Li Yan
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Zhenxiu Hu
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China
| | - Yuande Peng
- Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, PR China.
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325
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Autotransporter-Based Surface Display of Hemicellulases onPseudomonas putida: Whole-Cell Biocatalysts for the Degradation of Biomass. ChemCatChem 2017. [DOI: 10.1002/cctc.201700577] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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326
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Chong GG, He YC, Liu QX, Kou XQ, Huang XJ, Di JH, Ma CL. Effective enzymatic in situ saccharification of bamboo shoot shell pretreated by dilute alkalic salts sodium hypochlorite/sodium sulfide pretreatment under the autoclave system. BIORESOURCE TECHNOLOGY 2017; 241:726-734. [PMID: 28628976 DOI: 10.1016/j.biortech.2017.05.182] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 05/26/2017] [Accepted: 05/27/2017] [Indexed: 05/25/2023]
Abstract
In this study, dilute alkali salts (0.6% NaClO, 0.067% Na2S) pretreatment at 10% sulfidity under the autoclave system at 120°C for 40min was used for pretreating bamboo shoot shell (BSS). Furthermore, FT-IR, XRD and SEM were employed to characterize the changes in the cellulose structural characteristics (porosity, morphology, and crystallinity) of the pretreated BSS solid residue. After 72h, the reducing sugars and glucose from the enzymatic in situ hydrolysis of 50g/L pretreated BSS in dilute NaClO/Na2S media could be obtained at 31.11 and 20.32g/L, respectively. Finally, the obtained BSS-hydrolysates containing alkalic salt NaClO/Na2S resulted in slightly negative effects on the ethanol production. Glucose in BSS-hydrolysates was fermented from 20.0 to 0.17g/L within 48h, and an ethanol yield of 0.41g/g glucose, which represents 80.1% of the theoretical yield, was obtained. This study provided an effective strategy for potential utilization of BSS.
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Affiliation(s)
- Gang-Gang Chong
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China
| | - Yu-Cai He
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China; Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, China; Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei University of Technology, Wuhan, China.
| | - Qiu-Xiang Liu
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China
| | - Xiao-Qin Kou
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China
| | - Xiao-Jun Huang
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China
| | - Jun-Hua Di
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China
| | - Cui-Luan Ma
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, China; Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, China
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327
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Xu X, Xu Z, Shi S, Lin M. Lignocellulose degradation patterns, structural changes, and enzyme secretion by Inonotus obliquus on straw biomass under submerged fermentation. BIORESOURCE TECHNOLOGY 2017; 241:415-423. [PMID: 28582764 DOI: 10.1016/j.biortech.2017.05.087] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/14/2017] [Accepted: 05/15/2017] [Indexed: 05/27/2023]
Abstract
This study examined the white rot fungus I. obliquus on the degradation of three types of straw biomass and the production of extracellular lignocellulolytic enzymes under submerged fermentation. The fungus process resulted in a highest lignin loss of 72%, 39%, and 47% in wheat straw, rice straw, and corn stover within 12days, respectively. In merely two days, the fungus selectively degraded wheat straw lignin by 37%, with only limited cellulose degradation (13%). Fourier transform infrared spectroscopy revealed that the fungus most effectively degraded the wheat straw lignin and rice straw crystalline cellulose. Scanning electronic microscopy showed the most pronounced structural changes in wheat straw. High activities of manganese peroxidase (159.0U/mL) and lignin peroxidase (123.4U/mL) were observed in wheat straw culture on Day 2 and 4, respectively. Rice straw was the best substrate to induce the production of cellulase and xylanase.
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Affiliation(s)
- Xiangqun Xu
- College of Life Sciences, Zhejiang Sci-Tech University, China.
| | - Zhiqi Xu
- College of Life Sciences, Zhejiang Sci-Tech University, China
| | - Song Shi
- College of Life Sciences, Zhejiang Sci-Tech University, China
| | - Mengmeng Lin
- College of Life Sciences, Zhejiang Sci-Tech University, China
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328
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Wu H, Dai X, Zhou SL, Gan YY, Xiong ZY, Qin YH, Ma J, Yang L, Wu ZK, Wang TL, Wang WG, Wang CW. Ultrasound-assisted alkaline pretreatment for enhancing the enzymatic hydrolysis of rice straw by using the heat energy dissipated from ultrasonication. BIORESOURCE TECHNOLOGY 2017; 241:70-74. [PMID: 28550775 DOI: 10.1016/j.biortech.2017.05.090] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 05/13/2017] [Accepted: 05/15/2017] [Indexed: 05/19/2023]
Abstract
Rice straw samples were exposed to ultrasound-assisted alkaline (NaOH) pretreatment by using the heat energy dissipated from ultrasonication to increase their enzymatic digestibility for saccharification. The characterization shows that the pretreatment could selectively remove lignin and hemicellulose without degrading cellulose, and increase porosity and surface area of rice straw. The porosity, surface area and cellulose content of rice straw increased with the increasing concentration of NaOH used. The rice straw sample pretreated by using the heat energy dissipated from ultrasonication has a higher surface area and a lower crystallinity index value than that pretreated by using the external source of heating, and the amount of reducing sugar released from the former sample at 48h of enzymatic saccharification, which is about 3.5 times as large as that from the untreated rice straw sample (2.91vs. 0.85gL-1), is slightly larger than that from the latter sample (2.91vs. 2.73gL-1). The ultrasound-assisted alkaline pretreatment by using the heat energy dissipated from ultrasonication was proved to be a reliable and effective method for rice straw pretreatment.
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Affiliation(s)
- Han Wu
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Xiao Dai
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Si-Li Zhou
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yu-Yan Gan
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zi-Yao Xiong
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yuan-Hang Qin
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China.
| | - Jiayu Ma
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Li Yang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zai-Kun Wu
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Tie-Lin Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Wei-Guo Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Cun-Wen Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
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329
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Delignification and detoxification of peanut shell bio-waste using an extremely halophilic laccase from an Aquisalibacillus elongatus isolate. Extremophiles 2017; 21:993-1004. [PMID: 28871494 DOI: 10.1007/s00792-017-0958-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 08/21/2017] [Indexed: 10/18/2022]
Abstract
Lignocellulose bioconversion is a harsh process requiring the use of surfactants and organic solvents. Consequently, the incorporation of laccases in this bioconversion requires the bioprospecting of enzymes that can remain stable under extreme conditions. An extracellular, highly stable laccase was produced by the halophilic isolate Aquisalibacillus elongatus in submerged liquid culture fermentation. Statistical and non-statistical strategies gave the highest enzymatic activity (8.02 U mL-1) following addition of glucose (1.7 g L-1), copper sulfate (0.8 g L-1), urea (15 g L-1), and CaCl2 (0.8 g L-1). The enzyme, after purification using a synthetic affinity support, delignified a peanut shell substrate by 45%. A pH of 8.0 and a temperature of 35 °C were optimal for delignification of this bio-waste material. Addition of [Bmim][PF6], 1,4-dioxane, acetone, and HBT promoted this bio-waste delignification. Bio-treatment in the presence of 50% [Bmim][PF6] gave a maximal lignin removal of 87%. The surfactants tested had no significant effects on the delignification yield. The laccase also detoxified the toxic phenols found in peanut shell waste. The high catalytic efficiency of this enzyme against a lignocellulosic sample under extreme conditions suggests the suitability of this laccase for industrial applications.
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330
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Brethauer S, Robert Lawrence S, Michael Hans-Peter S. Enhanced simultaneous saccharification and fermentation of pretreated beech wood by in situ treatment with the white rot fungus Irpex lacteus in a membrane aerated biofilm reactor. BIORESOURCE TECHNOLOGY 2017; 237:135-138. [PMID: 28400170 DOI: 10.1016/j.biortech.2017.03.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/03/2017] [Accepted: 03/07/2017] [Indexed: 06/07/2023]
Abstract
The aim of the present study was to investigate the combination of steam pretreatment and biological treatment with lignin degrading fungal strains in order to enable efficient bioprocessing of beech wood to ethanol. In a sequential process of steam and fungal pretreatment followed by enzymatic hydrolysis, Irpex lacteus almost doubled the glucose yield for mildly pretreated beech wood, but could not improve yields for more severely pretreated substrates. However, when simultaneous saccharification and fermentation is combined with in situ I. lacteus treatment, which is enabled by the application of a membrane aerated biofilm reactor, ethanol yields of optimally steam pretreated beech could be improved from 65 to 80%. Generally, in situ fungal treatment during bioprocessing of lignocellulose is an interesting method to harness the versatile abilities of white rot fungi.
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Affiliation(s)
- Simone Brethauer
- Bern University of Applied Sciences, School of Agricultural, Forest and Food Sciences, Länggasse 85, CH-3052 Zollikofen, Switzerland
| | - Shahab Robert Lawrence
- Bern University of Applied Sciences, School of Agricultural, Forest and Food Sciences, Länggasse 85, CH-3052 Zollikofen, Switzerland; Laboratory of Sustainable and Catalytic Processing, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Studer Michael Hans-Peter
- Bern University of Applied Sciences, School of Agricultural, Forest and Food Sciences, Länggasse 85, CH-3052 Zollikofen, Switzerland.
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331
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Ali SS, Abomohra AEF, Sun J. Effective bio-pretreatment of sawdust waste with a novel microbial consortium for enhanced biomethanation. BIORESOURCE TECHNOLOGY 2017; 238:425-432. [PMID: 28458176 DOI: 10.1016/j.biortech.2017.03.187] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2017] [Revised: 03/28/2017] [Accepted: 03/30/2017] [Indexed: 05/25/2023]
Abstract
Anaerobic digestion (AD) is considered an efficient cost-effective technology for sustainable biogas production from lignocellulosic wastes. A novel lignocellulosic degradation microbial consortium (LCDC) was isolated from rotten sawdust, and further used for sawdust pretreatment prior to AD. Results showed that pretreatment of sawdust for 10days led to significant reduction in cellulose, hemicelluloses, and lignin contents by 37.5%, 39.6%, and 56.7%, respectively, with respect to the control. In addition, the pretreatment enhanced cumulative biogas yield, which reached its maximum value of 312.0Lkg-1VS after 28days of AD (25.6% higher than the corresponding control). Moreover, the maximum significant cumulative methane yield was recorded after 28days of AD of the pretreated sawdust (155.2Lkg-1VS), which represented 72.6% higher than the corresponding control. Significantly higher biomethane yield from sawdust pretreated with LCDC confirms that this process is more economical than the previous reports.
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Affiliation(s)
- Sameh S Ali
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 212013 Zhenjiang, China; Botany Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt
| | - Abd El-Fatah Abomohra
- School of Energy and Power Engineering, Jiangsu University, 212013 Zhenjiang, China; Botany Department, Faculty of Science, Tanta University, 31527 Tanta, Egypt
| | - Jianzhong Sun
- Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, 212013 Zhenjiang, China.
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332
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Mishra V, Jana AK, Jana MM, Gupta A. Enhancement in multiple lignolytic enzymes production for optimized lignin degradation and selectivity in fungal pretreatment of sweet sorghum bagasse. BIORESOURCE TECHNOLOGY 2017; 236:49-59. [PMID: 28390277 DOI: 10.1016/j.biortech.2017.03.148] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 03/23/2017] [Accepted: 03/24/2017] [Indexed: 05/06/2023]
Abstract
The objective of this work was to study the increase in multiple lignolytic enzyme productions through the use of supplements in combination in pretreatment of sweet sorghum bagasse (SSB) by Coriolus versicolor such that enzymes act synergistically to maximize the lignin degradation and selectivity. Enzyme activities were enhanced by metallic salts and phenolic compound supplements in SSF. Supplement of syringic acid increased the activities of LiP, AAO and laccase; gallic acid increased MnP; CuSO4 increased laccase and PPO to improve the lignin degradations and selectivity individually, higher than control. Combination of supplements optimized by RSM increased the production of laccase, LiP, MnP, PPO and AAO by 17.2, 45.5, 3.5, 2.4 and 3.6 folds respectively for synergistic action leading to highest lignin degradation (2.3 folds) and selectivity (7.1 folds). Enzymatic hydrolysis of pretreated SSB yielded ∼2.43 times fermentable sugar. This technique could be widely applied for pretreatment and enzyme productions.
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Affiliation(s)
- Vartika Mishra
- Department of Biotechnology, Dr B R A National Institute of Technology, Jalandhar 144011, Punjab, India
| | - Asim K Jana
- Department of Biotechnology, Dr B R A National Institute of Technology, Jalandhar 144011, Punjab, India.
| | - Mithu Maiti Jana
- Department of Chemistry, Dr B R A National Institute of Technology, Jalandhar 144011, Punjab, India
| | - Antriksh Gupta
- Department of Biotechnology, Dr B R A National Institute of Technology, Jalandhar 144011, Punjab, India
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333
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Enhancing the enzymatic saccharification of bamboo shoot shell by sequential biological pretreatment with Galactomyces sp. CCZU11-1 and deep eutectic solvent extraction. Bioprocess Biosyst Eng 2017. [DOI: 10.1007/s00449-017-1800-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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334
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Liu H, Hu H, Jin Y, Yue X, Deng L, Wang F, Tan T. Co-fermentation of a mixture of glucose and xylose to fumaric acid by Rhizopus arrhizus RH 7-13-9. BIORESOURCE TECHNOLOGY 2017; 233:30-33. [PMID: 28258993 DOI: 10.1016/j.biortech.2017.02.035] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Revised: 02/07/2017] [Accepted: 02/08/2017] [Indexed: 05/12/2023]
Abstract
Lignocellulose is the most abundant biomass, composed of cellulose, hemicellulose and lignin. It can be converted into glucose and xylose, which could be utilized as carbon source to produce fumaric acid. But glucose and xylose were commonly used separately to produce fumaric acid, while the co-fermentation of glucose and xylose process was not studied so far. In this work, the co-fermentation process was researched through a new strain R. arrhizus RH 7-13-9# isolated from high concentration xylose. It was firstly proven to utilize glucose efficiently and 37.52g/L fumaric acid was obtained from 80g/L glucose. Furthermore, the effect of different ratios of glucose/xylose and carbon/nitrogen in the co-fermentation process was investigated and the best ratios were 75/25 (w/w) and 800/1 (w/w), where the yield of fumaric acid reached 46.78g/L.
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Affiliation(s)
- Huan Liu
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Huirong Hu
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Yuhan Jin
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Xuemin Yue
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Li Deng
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China.
| | - Fang Wang
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Tianwei Tan
- Beijing Bioprocess Key Laboratory, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, PR China
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335
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Pretreatment of Hardwood and Miscanthus with Trametes versicolor for Bioenergy Conversion and Densification Strategies. Appl Biochem Biotechnol 2017; 183:1401-1413. [DOI: 10.1007/s12010-017-2507-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/09/2017] [Indexed: 11/26/2022]
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336
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Hou X, Zhang L, Wizi J, Liao X, Ma B, Yang Y. Preparation and properties of cotton stalk bark fibers using combined steam explosion and laccase treatment. J Appl Polym Sci 2017. [DOI: 10.1002/app.45058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiuliang Hou
- Key Laboratory of Science & Technology of Eco-Textiles, Ministry of Education; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Li Zhang
- Key Laboratory of Science & Technology of Eco-Textiles, Ministry of Education; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Jakpa Wizi
- Key Laboratory of Science & Technology of Eco-Textiles, Ministry of Education; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Xiangru Liao
- Key Laboratory of Industrial Biotechnology Ministry of Education School of Biotechnology; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Bomou Ma
- Key Laboratory of Science & Technology of Eco-Textiles, Ministry of Education; Jiangnan University; Wuxi Jiangsu 214122 China
| | - Yiqi Yang
- Department of Textiles Merchandising & Fashion Design; University of Nebraska-Lincoln; Lincoln Nebraska 68583-0802
- Department of Biological Systems Engineering; University of Nebraska-Lincoln; Lincoln Nebraska 685830802
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337
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Zieliński M, Nowicka A, Dębowski M. Hydrothermal Depolymerization of Virginia Fanpetals ( Sida Hermaphrodita ) Biomass with the Use of Microwave Radiation as a Potential Method for Substrate Pre-treatment Before the Process of Methane Fermentation. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.egypro.2017.03.377] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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338
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Baral NR, Shah A. Comparative techno-economic analysis of steam explosion, dilute sulfuric acid, ammonia fiber explosion and biological pretreatments of corn stover. BIORESOURCE TECHNOLOGY 2017; 232:331-343. [PMID: 28242390 DOI: 10.1016/j.biortech.2017.02.068] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 02/13/2017] [Accepted: 02/15/2017] [Indexed: 06/06/2023]
Abstract
Pretreatment is required to destroy recalcitrant structure of lignocelluloses and then transform into fermentable sugars. This study assessed techno-economics of steam explosion, dilute sulfuric acid, ammonia fiber explosion and biological pretreatments, and identified bottlenecks and operational targets for process improvement. Techno-economic models of these pretreatment processes for a cellulosic biorefinery of 113.5 million liters butanol per year excluding fermentation and wastewater treatment sections were developed using a modelling software-SuperPro Designer. Experimental data of the selected pretreatment processes based on corn stover were gathered from recent publications, and used for this analysis. Estimated sugar production costs ($/kg) via steam explosion, dilute sulfuric acid, ammonia fiber explosion and biological methods were 0.43, 0.42, 0.65 and 1.41, respectively. The results suggest steam explosion and sulfuric acid pretreatment methods might be good alternatives at present state of technology and other pretreatment methods require research and development efforts to be competitive with these pretreatment methods.
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Affiliation(s)
- Nawa Raj Baral
- Department of Food, Agricultural and Biological Engineering, The Ohio State University, Wooster, OH, USA; Department of Mechanical Engineering, Institute of Engineering, Tribhuvan University, Kathmandu, Nepal
| | - Ajay Shah
- Department of Food, Agricultural and Biological Engineering, The Ohio State University, Wooster, OH, USA.
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339
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Postemsky PD, Bidegain MA, González-Matute R, Figlas ND, Cubitto MA. Pilot-scale bioconversion of rice and sunflower agro-residues into medicinal mushrooms and laccase enzymes through solid-state fermentation with Ganoderma lucidum. BIORESOURCE TECHNOLOGY 2017; 231:85-93. [PMID: 28199921 DOI: 10.1016/j.biortech.2017.01.064] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Revised: 01/27/2017] [Accepted: 01/28/2017] [Indexed: 06/06/2023]
Abstract
Solid-state fermentation was evaluated at the pilot-scale for the bioconversion and valorization of rice husks and straw (RSH), or sunflower seed hulls (SSH), into medicinal mushrooms and crude extracts, with laccase activity. The average mushroom yield was 56kg dry weight per ton of agro-residues. Laccase activity in crude aqueous extracts showed its maximum value of 10,927Ukg-1 in RSH (day 10, Exudate phase) and 16,442Ukg-1 in SSH (day 5, Full colonization phase), the activity at the Residual substrate phase being 511Ukg-1 in RSH and 803Ukg-1 in SSH, respectively. Crude extracts obtained with various protocols revealed differences in the extraction yields. Lyophilization followed by storage at 4°C allowed the preservation of laccase activity for more than one month. It is proposed that standard mushroom farms could increase their profits by obtaining laccase as a byproduct during the gaps in mycelium running.
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Affiliation(s)
- P D Postemsky
- Centro de Recursos Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur (UNS), CONICET, Laboratorio de Biotecnología de Hongos Comestibles y Medicinales, Camino de la Carrindanga Km7, Bahía Blanca (8000), Buenos Aires, Argentina.
| | - M A Bidegain
- Centro de Recursos Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur (UNS), CONICET, Laboratorio de Biotecnología de Hongos Comestibles y Medicinales, Camino de la Carrindanga Km7, Bahía Blanca (8000), Buenos Aires, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, Bahía Blanca (8000), Buenos Aires, Argentina
| | - R González-Matute
- Centro de Recursos Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur (UNS), CONICET, Laboratorio de Biotecnología de Hongos Comestibles y Medicinales, Camino de la Carrindanga Km7, Bahía Blanca (8000), Buenos Aires, Argentina
| | - N D Figlas
- Centro de Recursos Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur (UNS), CONICET, Laboratorio de Biotecnología de Hongos Comestibles y Medicinales, Camino de la Carrindanga Km7, Bahía Blanca (8000), Buenos Aires, Argentina; Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC), Argentina
| | - M A Cubitto
- Centro de Recursos Renovables de la Zona Semiárida (CERZOS), Universidad Nacional del Sur (UNS), CONICET, Laboratorio de Biotecnología de Hongos Comestibles y Medicinales, Camino de la Carrindanga Km7, Bahía Blanca (8000), Buenos Aires, Argentina; Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, San Juan 670, Bahía Blanca (8000), Buenos Aires, Argentina
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340
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Zheng DQ, Jin XN, Zhang K, Fang YH, Wu XC. Novel strategy to improve vanillin tolerance and ethanol fermentation performances of Saccharomycere cerevisiae strains. BIORESOURCE TECHNOLOGY 2017; 231:53-58. [PMID: 28192726 DOI: 10.1016/j.biortech.2017.01.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/18/2017] [Accepted: 01/20/2017] [Indexed: 06/06/2023]
Abstract
The aim of this work was to develop a novel strategy for improving the vanillin tolerance and ethanol fermentation performances of Saccharomyces cerevisiae strains. Isogeneic diploid, triploid, and tetraploid S. cerevisiae strains were generated by genome duplication of haploid strain CEN.PK2-1C. Ploidy increments improved vanillin tolerance and diminished proliferation capability. Antimitotic drug methyl benzimidazol-2-ylcarbamate (MBC) was used to introduce chromosomal aberrations into the tetraploid S. cerevisiae strain. Interestingly, aneuploid mutants with DNA contents between triploid and tetraploid were more resistant to vanillin and showed faster ethanol fermentation rates than all euploid strains. The physiological characteristics of these mutants suggest that higher bioconversion capacities of vanillin and ergosterol contents might contribute to improved vanillin tolerance. This study demonstrates that genome duplication and MBC treatment is a powerful strategy to improve the vanillin tolerance of yeast strains.
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Affiliation(s)
- Dao-Qiong Zheng
- College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China; Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, China
| | - Xin-Na Jin
- College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China
| | - Ke Zhang
- College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China
| | - Ya-Hong Fang
- College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China
| | - Xue-Chang Wu
- College of Life Science, Zhejiang University, Hangzhou 310058, Zhejiang Province, China.
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341
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Zhang K, Fang YH, Gao KH, Sui Y, Zheng DQ, Wu XC. Effects of genome duplication on phenotypes and industrial applications of Saccharomyces cerevisiae strains. Appl Microbiol Biotechnol 2017; 101:5405-5414. [PMID: 28429058 DOI: 10.1007/s00253-017-8284-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 03/27/2017] [Accepted: 03/30/2017] [Indexed: 01/21/2023]
Abstract
Polyploidy is common in Saccharomyces cerevisiae strains, but the physiological and phenotypic effects of ploidy changes have not been fully clarified. Here, isogenic diploid, triploid, and tetraploid S. cerevisiae strains were constructed from a haploid strain, CEN.PK2-1C. Stress tolerance and ethanol fermentation performance of the four euploid strains were compared. Each euploid strain had strengths and weaknesses in tolerance to certain stressors, and no single strain was tolerant of all stressors. The diploid had higher ethanol production than the other strains in normal fermentation medium, while the triploid strain showed the fastest fermentation rate in the presence of inhibitors found in lignocellulosic hydrolysate. Physiological determination revealed diverse physiological attributes, such as trehalose, ergosterol, glutathione, and anti-oxidative enzymes among the strains. Our analyses suggest that both ploidy parity and number of chromosome sets contribute to changes in physiological status. Using qRT-PCR, different expression patterns of genes involved in the regulation of cell morphology and the biosynthesis of key physiological attributes among strains were determined. Our data provide novel insights into the multiple effects of genome duplication on yeast cells and are a useful reference for breeding excellent strains used in specific industrial applications.
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Affiliation(s)
- Ke Zhang
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China.,Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Ya-Hong Fang
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China
| | - Ke-Hui Gao
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China
| | - Yang Sui
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China
| | - Dao-Qiong Zheng
- Ocean College, Zhejiang University, Zhoushan, Zhejiang Province, 316021, China.
| | - Xue-Chang Wu
- College of Life Science, Zhejiang University, Hangzhou, Zhejiang Province, 310058, China.
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342
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Glyoxal oxidases: their nature and properties. World J Microbiol Biotechnol 2017; 33:87. [DOI: 10.1007/s11274-017-2254-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/29/2017] [Indexed: 01/30/2023]
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343
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Kumar R, Sharma RK, Singh AP. Cellulose based grafted biosorbents - Journey from lignocellulose biomass to toxic metal ions sorption applications - A review. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.02.050] [Citation(s) in RCA: 92] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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344
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Rezaei S, Shahverdi AR, Faramarzi MA. Isolation, one-step affinity purification, and characterization of a polyextremotolerant laccase from the halophilic bacterium Aquisalibacillus elongatus and its application in the delignification of sugar beet pulp. BIORESOURCE TECHNOLOGY 2017; 230:67-75. [PMID: 28161622 DOI: 10.1016/j.biortech.2017.01.036] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 01/14/2017] [Accepted: 01/19/2017] [Indexed: 06/06/2023]
Abstract
The aim of the present work was to study the ability of a halophilic bacterial laccase to efficient delignification in extreme conditions. Here, a highly stable extracellular laccase showing ligninolytic activity from halophilic Aquisalibacillus elongatus is described. The laccase production was strongly influenced by NaCl and CuSO4 and under optimal conditions reached 4.8UmL-1. The monomeric enzyme of 75kDa was purified by a synthetic affinity column with 68.2% yield and 99.8-fold purification. The enzyme showed some valuable features viz. stability against a wide range of organic solvents, salts, metals, inhibitors, and surfactants and specificity to a wide spectrum of substrates diverse in structure and redox potential. It retained more than 50% of the original activity at 25-75°C and pH 5.0-10.0. Furthermore, the enzyme was found to be effective in the delignification of sugar beet pulp in an ionic liquid that makes it useful for industrial applications.
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Affiliation(s)
- Shahla Rezaei
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research Center, Tehran University of Medical Sciences, P.O. Box 14155-6451, Tehran 1417614411, Iran
| | - Ahmad Reza Shahverdi
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research Center, Tehran University of Medical Sciences, P.O. Box 14155-6451, Tehran 1417614411, Iran
| | - Mohammad Ali Faramarzi
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy and Biotechnology Research Center, Tehran University of Medical Sciences, P.O. Box 14155-6451, Tehran 1417614411, Iran.
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345
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Xiao Q, Ma F, Li Y, Yu H, Li C, Zhang X. Differential Proteomic Profiles of Pleurotus ostreatus in Response to Lignocellulosic Components Provide Insights into Divergent Adaptive Mechanisms. Front Microbiol 2017; 8:480. [PMID: 28386251 PMCID: PMC5362632 DOI: 10.3389/fmicb.2017.00480] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/08/2017] [Indexed: 12/17/2022] Open
Abstract
Pleurotus ostreatus is a white rot fungus that grows on lignocellulosic biomass by metabolizing the main constituents. Extracellular enzymes play a key role in this process. During the hydrolysis of lignocellulose, potentially toxic molecules are released from lignin, and the molecules are derived from hemicellulose or cellulose that trigger various responses in fungus, thereby influencing mycelial growth. In order to characterize the mechanism underlying the response of P. ostreatus to lignin, we conducted a comparative proteomic analysis of P. ostreatus grown on different lignocellulose substrates. In this work, the mycelium proteome of P. ostreatus grown in liquid minimal medium with lignin, xylan, and carboxymethyl cellulose (CMC) was analyzed using the complementary two-dimensional gel electrophoresis (2-DE) approach; 115 proteins were identified, most of which were classified into five types according to their function. Proteins with an antioxidant function that play a role in the stress response were upregulated in response to lignin. Most proteins involving in carbohydrate and energy metabolism were less abundant in lignin. Xylan and CMC may enhanced the process of carbohydrate metabolism by regulating the level of expression of various carbohydrate metabolism-related proteins. The change of protein expression level was related to the adaptability of P. ostreatus to lignocellulose. These findings provide novel insights into the mechanisms underlying the response of white-rot fungus to lignocellulose.
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Affiliation(s)
- Qiuyun Xiao
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
- Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural UniversityKunming, China
| | - Fuying Ma
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
| | - Yan Li
- Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural UniversityKunming, China
| | - Hongbo Yu
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
| | - Chengyun Li
- Key Laboratory of Agro-Biodiversity and Pest Management of Education Ministry of China, Yunnan Agricultural UniversityKunming, China
| | - Xiaoyu Zhang
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and TechnologyWuhan, China
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346
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Tsai AYL, Chan K, Ho CY, Canam T, Capron R, Master ER, Bräutigam K. Transgenic expression of fungal accessory hemicellulases in Arabidopsis thaliana triggers transcriptional patterns related to biotic stress and defense response. PLoS One 2017; 12:e0173094. [PMID: 28253318 PMCID: PMC5333852 DOI: 10.1371/journal.pone.0173094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Accepted: 02/15/2017] [Indexed: 11/18/2022] Open
Abstract
The plant cell wall is an abundant and renewable resource for lignocellulosic applications such as the production of biofuel. Due to structural and compositional complexities, the plant cell wall is, however, recalcitrant to hydrolysis and extraction of platform sugars. A cell wall engineering strategy to reduce this recalcitrance makes use of microbial cell wall modifying enzymes that are expressed directly in plants themselves. Previously, we constructed transgenic Arabidopsis thaliana constitutively expressing the fungal hemicellulases: Phanerochaete carnosa glucurnoyl esterase (PcGCE) and Aspergillus nidulans α-arabinofuranosidase (AnAF54). While the PcGCE lines demonstrated improved xylan extractability, they also displayed chlorotic leaves leading to the hypothesis that expression of such enzymes in planta resulted in plant stress. The objective of this study is to investigate the impact of transgenic expression of the aforementioned microbial hemicellulases in planta on the host arabidopsis. More specifically, we investigated transcriptome profiles by short read high throughput sequencing (RNAseq) from developmentally distinct parts of the plant stem. When compared to non-transformed wild-type plants, a subset of genes was identified that showed differential transcript abundance in all transgenic lines and tissues investigated. Intriguingly, this core set of genes was significantly enriched for those involved in plant defense and biotic stress responses. While stress and defense-related genes showed increased transcript abundance in the transgenic plants regardless of tissue or genotype, genes involved in photosynthesis (light harvesting) were decreased in their transcript abundance potentially reflecting wide-spread effects of heterologous microbial transgene expression and the maintenance of plant homeostasis. Additionally, an increase in transcript abundance for genes involved in salicylic acid signaling further substantiates our finding that transgenic expression of microbial cell wall modifying enzymes induces transcriptome responses similar to those observed in defense responses.
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Affiliation(s)
- Alex Yi-Lin Tsai
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Berkeley, California, United States of America
| | - Kin Chan
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Chi-Yip Ho
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Thomas Canam
- Department of Biological Sciences, Eastern Illinois University, Charleston, Illinois, United States of America
| | - Resmi Capron
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Emma R. Master
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Ontario, Canada
| | - Katharina Bräutigam
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Department of Biology, University of Toronto Mississauga, Mississauga, Ontario, Canada
- * E-mail:
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347
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Cheng J, Zhang J, Lin R, Liu J, Zhang L, Cen K. Ionic-liquid pretreatment of cassava residues for the cogeneration of fermentative hydrogen and methane. BIORESOURCE TECHNOLOGY 2017; 228:348-354. [PMID: 28088097 DOI: 10.1016/j.biortech.2016.12.107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/29/2016] [Accepted: 12/30/2016] [Indexed: 06/06/2023]
Abstract
An ionic liquid of N-methylmorpholine-N-oxide (NMMO) was used to effectively pretreat cassava residues for the efficient enzymatical hydrolysis and cogeneration of fermentative hydrogen and methane. The reducing sugar yield of enzymolysed cassava residues with NMMO pretreatment improved from 36 to 42g/100g cassava residues. Scanning electron microscopy images revealed the formation of deep grooves (∼4μm wide) and numerous pores in the cassava residues pretreated with NMMO. X-ray diffraction patterns showed that the crystallinity coefficient of NMMO-pretreated cassava residues decreased from 40 to 34. Fourier transform infrared spectra indicated that crystal cellulose I was partially transformed to amorphous cellulose II in the NMMO-pretreated cassava residues. This transformation resulted in a reduced crystallinity index from 0.85 to 0.77. Hydrogen yield from the enzymolysed cassava residues pretreated with NMMO increased from 92.3 to 126mL/gTVS, and the sequential methane yield correspondingly increased from 79.4 to 101.6mL/g TVS.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Jiabei Zhang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Richen Lin
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jianzhong Liu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Li Zhang
- Shandong Botong New Energy Company, Jining 272000, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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348
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Xiong ZY, Qin YH, Ma JY, Yang L, Wu ZK, Wang TL, Wang WG, Wang CW. Pretreatment of rice straw by ultrasound-assisted Fenton process. BIORESOURCE TECHNOLOGY 2017; 227:408-411. [PMID: 28065569 DOI: 10.1016/j.biortech.2016.12.105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Revised: 12/27/2016] [Accepted: 12/28/2016] [Indexed: 05/20/2023]
Abstract
Fenton's reagent, ultrasound, and the combination of Fenton's reagent and ultrasound were used to pretreat rice straw (RS) to increase its enzymatic digestibility for saccharification. The characterization shows that compared with ultrasound, Fenton's reagent pretreatment was more efficient in increasing the specific surface area and decreasing the degree of polymerization (DP) of RS. The enzymatic hydrolysis results showed that the RS pretreated by ultrasound-assisted Fenton's reagent (U/F-RS), which exhibited the largest specific surface area and the lowest DP value, had the highest enzymatic activity, and the amount of reducing sugar released from U/F-RS at 48h of enzymatic saccharification is about 4 times as large as that from raw RS and 1.5 times as large as that from Fenton's reagent pretreated RS. The ultrasound-assisted Fenton process provides a reliable and effective method for RS pretreatment.
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Affiliation(s)
- Zi-Yao Xiong
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Yuan-Hang Qin
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China.
| | - Jia-Yu Ma
- Key Laboratory of Green Chemical Process of Ministry of Education, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Li Yang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Zai-Kun Wu
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Tie-Lin Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Wei-Guo Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Cun-Wen Wang
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province, School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
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349
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de Figueiredo FC, Carvalho AFA, Brienzo M, Campioni TS, de Oliva-Neto P. Chemical input reduction in the arabinoxylan and lignocellulose alkaline extraction and xylooligosaccharides production. BIORESOURCE TECHNOLOGY 2017; 228:164-170. [PMID: 28063358 DOI: 10.1016/j.biortech.2016.12.097] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 12/22/2016] [Accepted: 12/23/2016] [Indexed: 05/26/2023]
Abstract
Lignocellulosic material breakdown by hydrolysis is an important step to open new perspectives for bioenergy and special foods production like prebiotic xylooligosaccharides. Improvement of lignocellulose and arabinoxylan alkaline extraction from sugarcane bagasse and enzymatic hydrolysis were performed. Treatments 1 (10% KOH at 70°C), 3 (5% KOH at 121°C) and ZD method (24% KOH at 35°C) showed solid lignocellulose recovery of respectively 75.2%, 74.2% and 73%. A range of 24.8-27% extracted material with high arabinoxylan content (72.1-76.3%) was obtained with these treatments. Treatment 1 and 3 exhibited great KOH reduction in the method reaction, 54.1% and 76.2%, respectively. Likewise, in treatment 3 there was a decrease in ethanol consumption (40.9%) when compared to ZD method. The extracted arabinoxylan showed susceptibility to enzymatic hydrolysis with high solid loading (7%) since Trichoderma reesei xylanases were advantageous for xylose production (54.9%), while Aspergillus fumigatus xylanases achieved better XOS production (27.1%).
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Affiliation(s)
- Franciane Cristina de Figueiredo
- Departament of Biochemistry and Microbiology, Institute of Biosciences, São Paulo State University (UNESP), Avenida 24 A, 1515, ZIP Code 13506-900 Rio Claro, SP, Brazil; Laboratory of Development of Bioprocesses, Bioenergy Research Institute (IPBEN), School of Sciences and Languages, São Paulo State University (UNESP), Avenida Dom Antonio, 2100, ZIP Code 19806-900 Assis, SP, Brazil.
| | - Ana Flavia Azevedo Carvalho
- Laboratory of Development of Bioprocesses, Bioenergy Research Institute (IPBEN), School of Sciences and Languages, São Paulo State University (UNESP), Avenida Dom Antonio, 2100, ZIP Code 19806-900 Assis, SP, Brazil
| | - Michel Brienzo
- Laboratory of Biomass Characterization, Bioenergy Research Institute (IPBEN), São Paulo State University (UNESP), Avenida 24 A, 1515, ZIP Code 13506-900 Rio Claro, SP, Brazil
| | - Tania Sila Campioni
- Laboratory of Development of Bioprocesses, Bioenergy Research Institute (IPBEN), School of Sciences and Languages, São Paulo State University (UNESP), Avenida Dom Antonio, 2100, ZIP Code 19806-900 Assis, SP, Brazil
| | - Pedro de Oliva-Neto
- Laboratory of Development of Bioprocesses, Bioenergy Research Institute (IPBEN), School of Sciences and Languages, São Paulo State University (UNESP), Avenida Dom Antonio, 2100, ZIP Code 19806-900 Assis, SP, Brazil
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350
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Toushik SH, Lee KT, Lee JS, Kim KS. Functional Applications of Lignocellulolytic Enzymes in the Fruit and Vegetable Processing Industries. J Food Sci 2017; 82:585-593. [PMID: 28152204 DOI: 10.1111/1750-3841.13636] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 12/23/2016] [Accepted: 01/04/2017] [Indexed: 11/29/2022]
Abstract
Cellulose, hemicellulose, pectin (carbohydrate), and lignin (noncarbohydrate) polymers are the main substrates of lignocellulose-degrading enzymes. They are present in large amounts in the primary cell wall and dietary fibers of major fruits and vegetables. During processing of fruits and vegetables to the corresponding final food products, lignocellulosic substrates are hydrolyzed by different lignocellulolytic enzymes. Currently, lignocellulolytic enzymes such as cellulases, xylanases, pectinases, and laccases are extensively used during the processing of fruits and vegetables, in applications like texturizing and flavoring of products in the food industries. The present article provides an updated overview of functional applications of lignocellulolytic enzymes in the juice processing, oil extraction, and alcoholic beverage processing industries. Extensive use of lignocellulolytic enzymes in different food processing industries not only accelerates the production rates but also improves product quality. It is also possible to ensure the efficient use of fruits and vegetables globally by employing lignocellulolytic enzymes in the corresponding processing industries to convert them into food commodities, which will not only raise their economic value in the global market but also increase food availability, which will help mitigate nutritional problems worldwide.
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Affiliation(s)
| | - Kyung-Tai Lee
- Animal Genomics and Bioinformatics Div., Natl. Inst. of Animal Science, Rural Development Administration, Wanju, 565-851, South Korea
| | - Jin-Sung Lee
- Dept. of Biological Sciences, Kyonggi Univ., Suwon, 442-760, South Korea
| | - Keun-Sung Kim
- Dept. of Food Science and Technology, Chung-Ang Univ., Ansung, 456-756, South Korea
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