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Wei Y, Xu D, Xu M, Zheng P, Fan L, Leng L, Kapusta K. Hydrothermal liquefaction of municipal sludge and its products applications. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 908:168177. [PMID: 37923270 DOI: 10.1016/j.scitotenv.2023.168177] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 11/07/2023]
Abstract
Hydrothermal liquefaction (HTL) is an effective medium-temperature, high-pressure thermochemical process to dispose municipal sludge (MS), and biocrude (a crude bio-oil) is its main product. Many efforts are continued extensively to improve conversion efficiency and to promote industrial application of this technology. This work focuses on critical influencing factors (e.g., reaction temperature, residence time, atmosphere, solvent, catalyst, and pretreatment) and fundamental transformation mechanisms of main components (i.e., lipids, proteins, and carbohydrates) in MS HTL. It also analyzes migration behavior of heavy metals during MS HTL, which can provide a reference for subsequent recovery of nutrients from HTL products. Moreover, the applications of MS HTL products are systematically expounded, and potential challenges and opportunities are highlighted as well. It is necessary to develop advanced methods of catalyst recovery and innovative biocrude upgrading methods so as to reduce HTL investment and operating costs. Reusing aqueous phase and solid phase products as reaction medium and catalyst carrier separately after MS HTL is feasible to realize resource utilization of MS. This information can provide valuable guidance to promote MS HTL industrialization.
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Affiliation(s)
- Ya Wei
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Donghai Xu
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China.
| | - Mingxin Xu
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Peiyao Zheng
- Key Laboratory of Thermo-Fluid Science & Engineering, Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi Province 710049, China
| | - Liangliang Fan
- Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Resources, Environmental & Chemical Engineering, Nanchang University, Nanchang 330031, China
| | - Lijian Leng
- School of Energy Science and Engineering, Central South University, Changsha 410083, China
| | - Krzysztof Kapusta
- Główny Instytut Górnictwa, Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
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2
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Srivastava V, Lappalainen K, Rusanen A, Morales G, Lassi U. Current Status and Challenges for Metal-Organic-Framework-Assisted Conversion of Biomass into Value-Added Chemicals. Chempluschem 2023; 88:e202300309. [PMID: 37779099 DOI: 10.1002/cplu.202300309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/03/2023]
Abstract
Owing to the abundance of availability, low cost, and environmental-friendliness, biomass waste could serve as a prospective renewable source for value-added chemicals. Nevertheless, biomass conversion into chemicals is quite challenging due to the heterogeneous nature of biomass waste. Biomass-derived chemicals are appealing sustainable solutions that can reduce the dependency on existing petroleum-based production. Metal-organic frameworks (MOFs)-based catalysts and their composite materials have attracted considerable amounts of interest in biomass conversion applications recently because of their interesting physical and chemical characteristics. Due to their tunability, the catalytic activity and selectivity of MOF-based catalyst/composite materials can be tailored by functionalizing them with a variety of functional groups to enhance biomass conversion efficiency. This review focuses on the catalytic transformation of lignocellulosic biomass into value-added chemicals by employing MOF-based catalyst/composite materials. The main focus is given to the production of the platform chemicals HMF and Furfural from the corresponding (hemi)cellulosic biomass, due to their versatility as intermediates for the production of various biobased chemicals and fuels. The effects of different experimental parameters on the conversion of biomass by MOF-based catalysts are also included. Finally, current challenges and perspectives of biomass conversion into chemicals by MOF-based catalysts are highlighted.
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Affiliation(s)
- Varsha Srivastava
- Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
| | - Katja Lappalainen
- Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
| | - Annu Rusanen
- Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
| | - Gabriel Morales
- Chemical and Environmental Engineering Group, Universidad Rey Juan Carlos, Tulipán s-n, 28933, Móstoles, Madrid, Spain
| | - Ulla Lassi
- Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
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Xu P, Shu L, Li Y, Zhou S, Zhang G, Wu Y, Yang Z. Pretreatment and composting technology of agricultural organic waste for sustainable agricultural development. Heliyon 2023; 9:e16311. [PMID: 37305492 PMCID: PMC10256924 DOI: 10.1016/j.heliyon.2023.e16311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 04/16/2023] [Accepted: 05/12/2023] [Indexed: 06/13/2023] Open
Abstract
With the continuous development of agriculture, Agricultural organic waste (AOW) has become the most abundant renewable energy on earth, and it is a hot spot of research in recent years to realize the recycling of AOW to achieve sustainable development of agricultural production. However, lignocellulose, which is difficult to degrade in AOW, greenhouse gas emissions, and pile pathogenic fungi and insect eggs are the biggest obstacles to its return to land use. In response to the above problems researchers promote organic waste recycling by pretreating AOW, controlling composting conditions and adding other substances to achieve green return of AOW to the field and promote the development of agricultural production. This review summarizes the ways of organic waste treatment, factors affecting composting and problems in composting by researchers in recent years, with a view to providing research ideas for future related studies.
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Affiliation(s)
- Peng Xu
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Luolin Shu
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Yang Li
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Shun Zhou
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Guanzhi Zhang
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Yongjun Wu
- College of Life Sciences, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
| | - Zhenchao Yang
- College of Horticulture, Northwest Agriculture and Forestry University of Science and Technology, Yangling, Shaanxi Province, 712100, China
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4
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Hayes G, Laurel M, MacKinnon D, Zhao T, Houck HA, Becer CR. Polymers without Petrochemicals: Sustainable Routes to Conventional Monomers. Chem Rev 2023; 123:2609-2734. [PMID: 36227737 PMCID: PMC9999446 DOI: 10.1021/acs.chemrev.2c00354] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Access to a wide range of plastic materials has been rationalized by the increased demand from growing populations and the development of high-throughput production systems. Plastic materials at low costs with reliable properties have been utilized in many everyday products. Multibillion-dollar companies are established around these plastic materials, and each polymer takes years to optimize, secure intellectual property, comply with the regulatory bodies such as the Registration, Evaluation, Authorisation and Restriction of Chemicals and the Environmental Protection Agency and develop consumer confidence. Therefore, developing a fully sustainable new plastic material with even a slightly different chemical structure is a costly and long process. Hence, the production of the common plastic materials with exactly the same chemical structures that does not require any new registration processes better reflects the reality of how to address the critical future of sustainable plastics. In this review, we have highlighted the very recent examples on the synthesis of common monomers using chemicals from sustainable feedstocks that can be used as a like-for-like substitute to prepare conventional petrochemical-free thermoplastics.
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Affiliation(s)
- Graham Hayes
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom
| | - Matthew Laurel
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom
| | - Dan MacKinnon
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom
| | - Tieshuai Zhao
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom
| | - Hannes A Houck
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom.,Institute of Advanced Study, University of Warwick, CV4 7ALCoventry, United Kingdom
| | - C Remzi Becer
- Department of Chemistry, University of Warwick, CV4 7ALCoventry, United Kingdom
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5
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Zhou T, Yu S, Xu H, Liu H, Rao Y. Stimulating fungal cell wall integrity by exogenous β-glucanase to improve the production of fungal natural products. Appl Microbiol Biotechnol 2022; 106:7491-7503. [PMID: 36239763 DOI: 10.1007/s00253-022-12224-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 09/28/2022] [Accepted: 09/30/2022] [Indexed: 11/02/2022]
Abstract
The low production of natural products (NPs) is still the critical restrictive factor in exploiting their potential large-scale applications and a barrier to isolating and identifying other meaningful products. Given that the stimulation of cell wall integrity (CWI) has become a novel strategy to modulate the production of microbial natural products, herein, exogenous β-glucanase treatment was developed as an external cell wall β-glucan stress to stimulate the fungal CWI, and then to improve the production of fungal NPs. It was found that the production of fungal NPs cercosporin and sophorolipids, biosynthesized by Cercospora sp. and Starmerella bombicola, respectively, was significantly improved by the treatment of β-glucanase under a controllable dose. Moreover, it demonstrated that β-glucanase had an ability to stimulate fungal CWI through slight fungal superficial damage, thus facilitating the secretion of NPs. We expected that this easy-operating method to stimulate fungal CWI could be feasible to improve more fungal NPs production. KEY POINTS: • Exogenous β-glucanase stimulated the fungal cell wall integrity • Changing fungal cell walls modulated natural product production • β-glucanase with potential universal effects on more fungal natural products.
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Affiliation(s)
- Tingan Zhou
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Shiyu Yu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Huibin Xu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Huiling Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Yijian Rao
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China.
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6
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Ranganathan S, Mahesh S, Suresh S, Nagarajan A, Z Sen T, M Yennamalli R. Experimental and computational studies of cellulases as bioethanol enzymes. Bioengineered 2022; 13:14028-14046. [PMID: 35730402 PMCID: PMC9345620 DOI: 10.1080/21655979.2022.2085541] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bioethanol industries and bioprocesses have many challenges that constantly impede commercialization of the end product. One of the bottlenecks in the bioethanol industry is the challenge of discovering highly efficient catalysts that can improve biomass conversion. The current promising bioethanol conversion catalysts are microorganism-based cellulolytic enzymes, but lack optimization for high bioethanol conversion, due to biological and other factors. A better understanding of molecular underpinnings of cellulolytic enzyme mechanisms and significant ways to improve them can accelerate the bioethanol commercial production process. In order to do this, experimental methods are the primary choice to evaluate and characterize cellulase’s properties, but they are time-consuming and expensive. A time-saving, complementary approach involves computational methods that evaluate the same properties and improves our atomistic-level understanding of enzymatic mechanism of action. Theoretical methods in many cases have proposed research routes for subsequent experimental testing and validation, reducing the overall research cost. Having a plethora of tools to evaluate cellulases and the yield of the enzymatic process will aid in planning more optimized experimental setups. Thus, there is a need to connect the computational evaluation methods with the experimental methods to overcome the bottlenecks in the bioethanol industry. This review discusses various experimental and computational methods and their use in evaluating the multiple properties of cellulases.
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Affiliation(s)
- Shrivaishnavi Ranganathan
- Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed to be University, Tirumalaisamudram, Thanjavur, India
| | - Sankar Mahesh
- Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed to be University, Tirumalaisamudram, Thanjavur, India
| | - Sruthi Suresh
- Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed to be University, Tirumalaisamudram, Thanjavur, India
| | - Ayshwarya Nagarajan
- Department of Bioinformatics, School of Chemical and Biotechnology, SASTRA Deemed to be University, Tirumalaisamudram, Thanjavur, India
| | - Taner Z Sen
- S. Department of Agriculture, Agricultural Research Service, Crop Improvement and Genetics Research UnitU., California, USA
| | - Ragothaman M Yennamalli
- Department of Bioinformatics, School of Chemical and Biotechnology, SASTRA Deemed to be University, Tirumalaisamudram, Thanjavur, India
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7
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Sustainable and optimized bioethanol production using mix microbial consortium of Saccharomyces cerevisiae and Candida cantarelli. FUEL 2022. [DOI: 10.1016/j.fuel.2021.122763] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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8
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Repeated-batch simultaneous saccharification and fermentation of cassava pulp for ethanol production using amylases and Saccharomyces cerevisiae immobilized on bacterial cellulose. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2021.108258] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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Postawa K, Fałtynowicz H, Szczygieł J, Beran E, Kułażyński M. Analyzing the kinetics of waste plant biomass pyrolysis via thermogravimetry modeling and semi-statistical methods. BIORESOURCE TECHNOLOGY 2022; 344:126181. [PMID: 34755652 DOI: 10.1016/j.biortech.2021.126181] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 10/18/2021] [Indexed: 06/13/2023]
Abstract
This article presents a methodology for determining the kinetic parameters of biomass based on thermogravimetric analysis and the Coats-Redfern procedure with 27 model equations. Maize samples stored for approximately one year were used herein. The first sub-stage of pyrolysis was a first-order reaction with nuclei growth of n = 1, and the second sub-stage indicated a different kinetic order (1.5) of the reaction. The last sub-step showed good convergence with the first-order reaction and nuclei growth of n = 1.5. The activation energy reached up to 71.6 kJ/mol for tżhe selected parts of the stalk fraction, whereas it decreased to 6.5 kJ/mol for the others. A simplified method for approximating the composition of the biomass is also presented. In the composition of stalks, the fraction of hemicellulose was the highest, followed by that of cellulose, whereas in the composition of leaves and whole plant samples, an opposite trend was observed.
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Affiliation(s)
- Karol Postawa
- Faculty of Chemistry, Wrocław University of Science and Technology, Gdańska 7/9, 50-344, Wrocław, Poland.
| | - Hanna Fałtynowicz
- Faculty of Chemistry, Wrocław University of Science and Technology, Gdańska 7/9, 50-344, Wrocław, Poland
| | - Jerzy Szczygieł
- Faculty of Chemistry, Wrocław University of Science and Technology, Gdańska 7/9, 50-344, Wrocław, Poland
| | - Elżbieta Beran
- Faculty of Chemistry, Wrocław University of Science and Technology, Gdańska 7/9, 50-344, Wrocław, Poland
| | - Marek Kułażyński
- Faculty of Chemistry, Wrocław University of Science and Technology, Gdańska 7/9, 50-344, Wrocław, Poland
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10
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Sarker TR, Pattnaik F, Nanda S, Dalai AK, Meda V, Naik S. Hydrothermal pretreatment technologies for lignocellulosic biomass: A review of steam explosion and subcritical water hydrolysis. CHEMOSPHERE 2021; 284:131372. [PMID: 34323806 DOI: 10.1016/j.chemosphere.2021.131372] [Citation(s) in RCA: 65] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 04/26/2021] [Accepted: 06/26/2021] [Indexed: 05/10/2023]
Abstract
The pretreatment of lignocellulosic biomass enhances the conversion efficiency to produce biofuels and value-added chemicals, which have the potential to replace fossil fuels. Compared to physicochemical and other pretreatment techniques, the hydrothermal methods are considered eco-friendly and cost-effective. This paper reviews the strengths, weaknesses, opportunities and threats of steam explosion and subcritical water hydrolysis as the two promising hydrothermal technologies for the pretreatment of lignocellulosic biomass. Although the principle of the steam explosion in depolymerizing the lignin and exposing the cellulose fibers for bioconversion to liquid fuels is well known, its underlying mechanism for solid biofuel production is less identified. Therefore, this review provides an insight into different operating conditions of steam explosion and subcritical water hydrolysis for a wide variety of feedstocks. The mechanisms of subcritical water hydrolysis including dehydration, decarboxylation and carbonization of waste biomass are comprehensively described. Finally, the role of microwave heating in the hydrothermal pretreatment of biomass is elucidated.
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Affiliation(s)
- Tumpa R Sarker
- Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Falguni Pattnaik
- Center for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, India
| | - Sonil Nanda
- Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Ajay K Dalai
- Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Venkatesh Meda
- Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Satyanarayan Naik
- Center for Rural Development and Technology, Indian Institute of Technology Delhi, New Delhi, India
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11
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Yin X, Wei L, Pan X, Liu C, Jiang J, Wang K. The Pretreatment of Lignocelluloses With Green Solvent as Biorefinery Preprocess: A Minor Review. FRONTIERS IN PLANT SCIENCE 2021; 12:670061. [PMID: 34168668 PMCID: PMC8218942 DOI: 10.3389/fpls.2021.670061] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Accepted: 05/06/2021] [Indexed: 06/02/2023]
Abstract
Converting agriculture and forestry lignocellulosic residues into high value-added liquid fuels (ethanol, butanol, etc.), chemicals (levulinic acid, furfural, etc.), and materials (aerogel, bioresin, etc.) via a bio-refinery process is an important way to utilize biomass energy resources. However, because of the dense and complex supermolecular structure of lignocelluloses, it is difficult for enzymes and chemical reagents to efficiently depolymerize lignocelluloses. Strikingly, the compact structure of lignocelluloses could be effectively decomposed with a proper pretreatment technology, followed by efficient separation of cellulose, hemicellulose and lignin, which improves the conversion and utilization efficiency of lignocelluloses. Based on a review of traditional pretreatment methods, this study focuses on the discussion of pretreatment process with recyclable and non-toxic/low-toxic green solvents, such as polar aprotic solvents, ionic liquids, and deep eutectic solvents, and provides an outlook of the industrial application prospects of solvent pretreatment.
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Affiliation(s)
- Xiaoyan Yin
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
| | - Linshan Wei
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
| | - Xueyuan Pan
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
| | - Chao Liu
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
| | - Jianchun Jiang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
- National Engineering Laboratory for Biomass Chemical Utilization, Nanjing, China
| | - Kui Wang
- Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, China
- National Engineering Laboratory for Biomass Chemical Utilization, Nanjing, China
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12
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Gschwend FJV, Hallett JP, Brandt-Talbot A. Exploring the Effect of Water Content and Anion on the Pretreatment of Poplar with Three 1-Ethyl-3-methylimidazolium Ionic Liquids. Molecules 2020; 25:E2318. [PMID: 32429136 PMCID: PMC7288140 DOI: 10.3390/molecules25102318] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 05/09/2020] [Accepted: 05/12/2020] [Indexed: 11/17/2022] Open
Abstract
We report on the pretreatment of poplar wood with three different 1-ethyl-3-methylimidazolium ionic liquids, [EMim][OAc], [EMim][MeSO3], and [EMim][HSO4], at varying water contents from 0-40 wt% at 100 °C. The performance was evaluated by observing the lignin and hemicellulose removal, as well as enzymatic saccharification and lignin yield. The mechanism of pretreatment varied between the ionic liquids studied, with the hydrogen sulfate ionic liquid performing delignification and hemicellulose hydrolysis more effectively than the other solvents across the investigated water content range. The acetate ionic liquid produced superior glucose yield at low water contents, while the hydrogen sulfate ionic liquid performed better at higher water contents and produced a recoverable lignin. The methanesulfonate ionic liquid did not introduce significant fractionation or enhancement of saccharification yield under the conditions used. These findings help distinguish the roles of anion hydrogen bonding, solvent acidity, and water content on ionic liquid pretreatment and can aid with anion and water content selections for different applications.
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Affiliation(s)
- Florence J. V. Gschwend
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK; (F.J.V.G.); (J.P.H.)
| | - Jason P. Hallett
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK; (F.J.V.G.); (J.P.H.)
| | - Agnieszka Brandt-Talbot
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK; (F.J.V.G.); (J.P.H.)
- Department of Chemistry, Imperial College London, London W12 0BZ, UK
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13
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Recent advances in polyhydroxyalkanoate production: Feedstocks, strains and process developments. Int J Biol Macromol 2020; 156:691-703. [PMID: 32315680 DOI: 10.1016/j.ijbiomac.2020.04.082] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/01/2020] [Accepted: 04/12/2020] [Indexed: 11/20/2022]
Abstract
Polyhydroxyalkanoates (PHAs) have been actively studied in academia and industry for their properties comparable to petroleum-derived plastics and high biocompatibility. However, the major limitation for commercialization is their high cost. Feedstock costs, especially carbon costs, account for the majority of the final cost. Finding cheap feedstocks for PHA production and associated process development are critical for a cost-effective PHA production. In this study, waste materials from different sources, particularly lignocellulosic biomass, were proposed as suitable feedstocks for PHA production. Strains involved in the conversion of these feedstocks into PHA were reviewed. Newly isolated strains were emphasized. Related process development, including the factors that affect PHA production, fermentation modes and downstream processing, was elaborated upon.
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14
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Review of Solvents Based on Biomass for Mitigation of Wax Paraffin in Indonesian Oilfield. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9245499] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This paper presents a review of the expectations and challenges of using biomass in the prevention and slowing of paraffin wax deposition that takes place during the crude oil production process. The inhibition of the deposition process involves the use of solvents from biomass that are generally available around the crude oil production field. The processes used to scale down the precipitation of wax include mixing crude oil with the manufacturer’s solvent composed of toluene and xylene. The goal is to assess solvents sourced from biomass that are capable to slow down the wax deposition process. Wax appearance temperature is an important characteristic to evaluate the possible wax precipitation of a given fluid. Wax precipitation can be reduced by using some chemical additives, often called the pour point depressant. This additive is expected to be produced from local biomass which can compete with solvents currently produced on the market.
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15
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You S, Xie C, Ma R, Huang HQ, Herman RA, Su XY, Ge Y, Cai HY, Yao B, Wang J, Luo HY. Improvement in catalytic activity and thermostability of a GH10 xylanase and its synergistic degradation of biomass with cellulase. BIOTECHNOLOGY FOR BIOFUELS 2019; 12:278. [PMID: 31827606 PMCID: PMC6892236 DOI: 10.1186/s13068-019-1620-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 11/25/2019] [Indexed: 05/29/2023]
Abstract
BACKGROUND Xylanase is one of the most extensively used biocatalysts for biomass degradation. However, its low catalytic efficiency and poor thermostability limit its applications. Therefore, improving the properties of xylanases to enable synergistic degradation of lignocellulosic biomass with cellulase is of considerable significance in the field of bioenergy. RESULTS Using fragment replacement, we improved the catalytic performance and thermostability of a GH10 xylanase, XylE. Of the ten hybrid enzymes obtained, seven showed xylanase activity. Substitution of fragments, M3, M6, M9, and their combinations enhanced the catalytic efficiency (by 2.4- to fourfold) as well as the specific activity (by 1.2- to 3.3-fold) of XylE. The hybrids, XylE-M3, XylE-M3/M6, XylE-M3/M9, and XylE-M3/M6/M9, showed enhanced thermostability, as observed by the increase in the T 50 (3-4.7 °C) and T m (1.1-4.7 °C), and extended t 1/2 (by 1.8-2.3 h). In addition, the synergistic effect of the mutant xylanase and cellulase on the degradation of mulberry bark showed that treatment with both XylE-M3/M6 and cellulase exhibited the highest synergistic effect. In this case, the degree of synergy reached 1.3, and the reducing sugar production and dry matter reduction increased by 148% and 185%, respectively, compared to treatment with only cellulase. CONCLUSIONS This study provides a successful strategy to improve the catalytic properties and thermostability of enzymes. We identified several xylanase candidates for applications in bioenergy and biorefinery. Synergistic degradation experiments elucidated a possible mechanism of cellulase inhibition by xylan and xylo-oligomers.
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Affiliation(s)
- Shuai You
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212018 People’s Republic of China
- Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212018 People’s Republic of China
| | - Chen Xie
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212018 People’s Republic of China
- Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212018 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, Beijing, 100081 China
| | - Huo-qing Huang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Richard Ansah Herman
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212018 People’s Republic of China
- Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212018 People’s Republic of China
| | - Xiao-yun Su
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Yan Ge
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212018 People’s Republic of China
- Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212018 People’s Republic of China
| | - Hui-yi Cai
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Jun Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang, 212018 People’s Republic of China
- Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang, 212018 People’s Republic of China
| | - Hui-ying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
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Ai P, Zhang X, Dinamarca C, Elsayed M, Yu L, Xi J, Mei Z. Different effects of ozone and aqueous ammonia in a combined pretreatment method on rice straw and dairy manure fiber for enhancing biomethane production. BIORESOURCE TECHNOLOGY 2019; 282:275-284. [PMID: 30875595 DOI: 10.1016/j.biortech.2019.03.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 06/09/2023]
Abstract
Low digestibility of lignocellulosic feedstock is the most important limitation for biogas production. The synergistic effects of ozone and aqueous ammonia (OSAA) on different types of lignocelluloses including rice straw and dairy manure fiber were investigated. OSAA significantly increased biogas production of rice straw by 114.2%-172.8% when compared with using ozonation alone, while increased by 6.2%-8.8% with manure fiber. OSAA pretreatment increased biogas production of manure fiber by 55.3%-103.6% when compared with soaking aqueous ammonia (SAA) alone, while by 28.8%-39.9% with rice straw. The specific effects of pretreatment time on anaerobic digestion of manure fiber differed noticeably from those on rice straw. Ozonation time had a major function for pretreatment of manure fiber via the OSAA process, but SAA pretreatment time was more important than that for rice straw.
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Affiliation(s)
- Ping Ai
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
| | - Xiuzhi Zhang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
| | - Carlos Dinamarca
- University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway
| | - Mahdy Elsayed
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, China; The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
| | - Liang Yu
- Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USA
| | - Jiang Xi
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, China
| | - Zili Mei
- Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, China.
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You S, Chen CC, Tu T, Wang X, Ma R, Cai HY, Guo RT, Luo HY, Yao B. Insight into the functional roles of Glu175 in the hyperthermostable xylanase XYL10C-ΔN through structural analysis and site-saturation mutagenesis. BIOTECHNOLOGY FOR BIOFUELS 2018; 11:159. [PMID: 29930705 PMCID: PMC5992652 DOI: 10.1186/s13068-018-1150-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 05/23/2018] [Indexed: 05/16/2023]
Abstract
BACKGROUND Improving the hydrolytic performance of hemicellulases to degrade lignocellulosic biomass is of considerable importance for second-generation biorefinery. Xylanase, as the crucial hemicellulase, must be thermostable and have high activity for its potential use in the bioethanol industry. To obtain excellent xylanase candidates, it is necessary to understand the structure-function relationships to provide a meaningful reference to improve the enzyme properties. This study aimed to investigate the catalytic mechanism of a highly active hyperthermophilic xylanase variant, XYL10C-ΔN, for hemicellulose degradation. RESULTS By removing the N-terminal 66 amino acids, the variant XYL10C-ΔN showed a 1.8-fold improvement in catalytic efficiency and could hydrolyze corn stover more efficiently in hydrolysis of corn stover; however, it retained similar thermostability to the wild-type XYL10C. Based on the crystal structures of XYL10C-ΔN and its complex with xylobiose, Glu175 located on loop 3 was found to be specific to GH10 xylanases and probably accounts for the excellent enzyme properties by interacting with Lys135 and Met137 on loop 2. Site-saturation mutagenesis confirmed that XYL10C-ΔN with glutamate acid at position 175 had the highest catalytic efficiency, specific activity, and the broadest pH-activity profile. The functional roles of Glu175 were also verified in the mutants of another two GH10 xylanases, XylE and XynE2, which showed increased catalytic efficiencies and wider pH-activity profiles. CONCLUSIONS XYL10C-ΔN, with excellent thermostability, high catalytic efficiency, and great lignocellulose-degrading capability, is a valuable candidate xylanase for the biofuel industry. The mechanism underlying improved activity of XYN10C-ΔN was thus investigated through structural analysis and functional verification, and Glu175 was identified to play the key role in the improved catalytic efficiency. This study revealed the importance of a key residue (Glu175) in XYN10C-ΔN and provides a reference to modify GH10 xylanases for improved catalytic performance.
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Affiliation(s)
- Shuai You
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Chun-Chi Chen
- National Engineering Laboratory of Industrial Enzymes, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China
- College of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Tao Tu
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Xiaoyu Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Rui Ma
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Hui-yi Cai
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Rey-Ting Guo
- National Engineering Laboratory of Industrial Enzymes, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308 China
- College of Life Sciences, Hubei University, Wuhan, 430062 China
| | - Hui-ying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081 China
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Development of Synthetic Microbial Platforms to Convert Lignocellulosic Biomass to Biofuels. ADVANCES IN BIOENERGY 2017. [DOI: 10.1016/bs.aibe.2016.12.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Ma Z, Li S, Fang G, Patil N, Yan N. Modification of chemical reactivity of enzymatic hydrolysis lignin by ultrasound treatment in dilute alkaline solutions. Int J Biol Macromol 2016; 93:1279-1284. [PMID: 27693747 DOI: 10.1016/j.ijbiomac.2016.09.095] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Revised: 09/22/2016] [Accepted: 09/27/2016] [Indexed: 10/20/2022]
Abstract
In this study, we have explored various ultrasound treatment conditions for structural modification of enzymatic hydrolysis lignin (EHL) for enhanced chemical reactivity. The key structural modifications were characterized by using a combination of analytical methods, including, Fourier Transform-Infrared spectroscopy (FTIR), Proton Nuclear Magnetic Resonance (1H NMR), Gel permeation chromatography (GPC), X-ray photoelectron spectroscopy (XPS), and Folin-Ciocalteu (F-C) method. Chemical reactivity of the modified EHL samples was determined by both 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging activity and their reactivity towards formaldehyde. It was observed that the modified EHL had a higher phenolic hydroxyl group content, a lower molecular weight, a higher reactivity towards formaldehyde, and a greater antioxidant property. The higher reactivity demonstrated by the samples after treatment suggesting that ultrasound is a promising method for modifying enzymatic hydrolysis lignin for value-added applications.
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Affiliation(s)
- Zhuoming Ma
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Shujun Li
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, PR China.
| | - Guizhen Fang
- Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, PR China
| | - Nikhil Patil
- Faculty of Forestry and Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3B3, Canada
| | - Ning Yan
- Faculty of Forestry and Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3B3, Canada.
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20
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You S, Tu T, Zhang L, Wang Y, Huang H, Ma R, Shi P, Bai Y, Su X, Lin Z, Luo H, Yao B. Improvement of the thermostability and catalytic efficiency of a highly active β-glucanase from Talaromyces leycettanus JCM12802 by optimizing residual charge-charge interactions. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:124. [PMID: 27303445 PMCID: PMC4906821 DOI: 10.1186/s13068-016-0544-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Accepted: 06/02/2016] [Indexed: 05/31/2023]
Abstract
BACKGROUND β-Glucanase is one of the most extensively used biocatalysts in biofuel, food and animal feed industries. However, the poor thermostability and low catalytic efficiency of most reported β-glucanases limit their applications. Currently, two strategies are used to overcome these bottlenecks, i.e., mining for novel enzymes from extremophiles and engineering existing enzymes. RESULTS A novel endo-β-1,3-1,4-glucanase of GH16 (Tlglu16A) from the thermophilic fungus Talaromyces leycettanus JCM12802 was produced in Pichia pastoris and characterized. For potential industrial applications, recombinant TlGlu16A exhibits favorable enzymatic properties over most reported glucanases, i.e., remarkable stability over a wide pH range from 1.0 to 10.0 and superior activity on glucan substrates (up to 15,197 U/mg). The only weakness of TlGlu16A is the thermolability at 65 °C and higher. To improve the thermostability, the enzyme thermal stability system was then used to engineer TlGlu16A through optimization of residual charge-charge interactions. Eleven mutants were constructed and compared to the wild-type TlGlu16A. Four mutants, H58D, E134R, D235G and D296K, showed longer half-life time at 80 °C (31, 7, 25, 22 vs. 0.5 min), and two mutants, D235G and D296K, had greater specific activities (158.2 and 122.2 %, respectively) and catalytic efficiencies (k cat/K m, 170 and 114 %, respectively). CONCLUSIONS The engineered TlGlu16A has great application potentials from the perspectives of enzyme yield and properties. Its thermostability and activity were apparently improved in the engineered enzymes through charge optimization. This study spans the genetic, functional and structural fields, and provides a combination of gene mining and protein engineering approaches for the systematic improvement of enzyme performance.
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Affiliation(s)
- Shuai You
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Tao Tu
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Lujia Zhang
- />State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237 People’s Republic of China
| | - Yuan Wang
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Huoqing Huang
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South 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 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Pengjun Shi
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Yingguo Bai
- />Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081 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 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
| | - Zhemin Lin
- />Institute of Animal Science and Veterinary Medicine, Hainan Academy of Agricultural Sciences, Haikou, 571100 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 Zhongguancun South 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 Zhongguancun South Street, Beijing, 100081 People’s Republic of China
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Velmurugan R, Incharoensakdi A. Proper ultrasound treatment increases ethanol production from simultaneous saccharification and fermentation of sugarcane bagasse. RSC Adv 2016. [DOI: 10.1039/c6ra17792a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
To improve the saccharification and fermentation processes, proper ultrasound was applied which resulted in the presence of cellulase complex with improved β-glucosidase ratio leading to enhanced overall ethanol yield.
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Sebayang AH, Masjuki HH, Ong HC, Dharma S, Silitonga AS, Mahlia TMI, Aditiya HB. A perspective on bioethanol production from biomass as alternative fuel for spark ignition engine. RSC Adv 2016. [DOI: 10.1039/c5ra24983j] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The increasing fuel consumption of fossil fuels has led to the development of alternative fuels for the future.
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Affiliation(s)
- A. H. Sebayang
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - H. H. Masjuki
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Hwai Chyuan Ong
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - S. Dharma
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - A. S. Silitonga
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - T. M. I. Mahlia
- Department of Mechanical Engineering
- Universiti Tenaga Nasional
- 43000 Kajang
- Malaysia
| | - H. B. Aditiya
- Department of Mechanical Engineering
- Universiti Tenaga Nasional
- 43000 Kajang
- Malaysia
- Department of Mechanical Engineering
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Athmanathan A, Trupia S. Examining the role of particle size on ammonia-based bioprocessing of maize stover. Biotechnol Prog 2015; 32:134-40. [PMID: 26587736 DOI: 10.1002/btpr.2203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 11/17/2015] [Indexed: 11/10/2022]
Abstract
The role of particle size in carbohydrate fractionation upon pretreatment and glucan yields upon enzymatic hydrolysis was investigated at two different temperatures, to examine the possibility of pretreating under milder conditions smaller particles, in order to satisfy pilot-scale operational constraints. Maize stover was knife-milled through 1-mm and 0.5-mm screens and pretreated by soaking in aqueous ammonia pretreatment at 60 or 110°C for 6 h. Pretreated solids were analyzed for composition and a material balance calculated for glucan, xylan, and lignin. At 60°C, milling resulted in greater delignification compared to unmilled biomass. Delignification was more uniform at 110°C. Pretreated solids were washed and cellulase hydrolysis carried out at 10% w/w solids loading, with low and high enzyme loadings. Liquid samples were drawn and concentration data developed through HPLC to calculate 48-h glucan and xylan hydrolytic yields. The differences in hydrolytic yield between milled and unmilled treatments were found to vary with pretreatment temperature and enzyme loading. The results show that while particle size impacts carbohydrate recovery and hydrolytic yield, it is less important in bioprocessing than pretreatment temperature and enzyme loading, possibly owing to the particles' morphology rather than the size.
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Affiliation(s)
- Arun Athmanathan
- National Corn-to-Ethanol Research Center (NCERC), The Graduate Schoool, Southern Illinois University, Edwardsville, IL, 62026
| | - Sabrina Trupia
- National Corn-to-Ethanol Research Center (NCERC), The Graduate Schoool, Southern Illinois University, Edwardsville, IL, 62026
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Mohaptra S, Dash PK, Behera SS, Thatoi H. Optimization of delignification of two Pennisetum grass species by NaOH pretreatment using Taguchi and ANN statistical approach. ENVIRONMENTAL TECHNOLOGY 2015; 37:940-951. [PMID: 26584152 DOI: 10.1080/09593330.2015.1093034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the bioconversion of lignocelluloses for bioethanol, pretreatment seems to be the most important step which improves the elimination of the lignin and hemicelluloses content, exposing cellulose to further hydrolysis. The present study discusses the application of dynamic statistical techniques like the Taguchi method and artificial neural network (ANN) in the optimization of pretreatment of lignocellulosic biomasses such as Hybrid Napier grass (HNG) (Pennisetum purpureum) and Denanath grass (DG) (Pennisetum pedicellatum), using alkali sodium hydroxide. This study analysed and determined a parameter combination with a low number of experiments by using the Taguchi method in which both the substrates can be efficiently pretreated. The optimized parameters obtained from the L16 orthogonal array are soaking time (18 and 26 h), temperature (60°C and 55°C), and alkali concentration (1%) for HNG and DG, respectively. High performance liquid chromatography analysis of the optimized pretreated grass varieties confirmed the presence of glucan (47.94% and 46.50%), xylan (9.35% and 7.95%), arabinan (2.15% and 2.2%), and galactan/mannan (1.44% and 1.52%) for HNG and DG, respectively. Physicochemical characterization studies of native and alkali-pretreated grasses were carried out by scanning electron microscopy and Fourier transformation Infrared spectroscopy which revealed some morphological differences between the native and optimized pretreated samples. Model validation by ANN showed a good agreement between experimental results and the predicted responses.
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Affiliation(s)
- Sonali Mohaptra
- a Department of Biotechnology, College of Engineering and Technology , Biju Patnaik University of Technology , Bhubaneswar, India
| | - Preeti Krishna Dash
- a Department of Biotechnology, College of Engineering and Technology , Biju Patnaik University of Technology , Bhubaneswar, India
| | - Sudhanshu Shekar Behera
- b Department of Biotechnology and Medical Engineering , National Institute of Technology , Rourkela, India
| | - Hrudayanath Thatoi
- a Department of Biotechnology, College of Engineering and Technology , Biju Patnaik University of Technology , Bhubaneswar, India
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Yu HY, Li X. Characterization of an organic solvent-tolerant thermostable glucoamylase from a halophilic isolate, Halolactibacillus sp. SK71 and its application in raw starch hydrolysis for bioethanol production. Biotechnol Prog 2014; 30:1262-8. [PMID: 25138675 DOI: 10.1002/btpr.1978] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 06/14/2014] [Indexed: 11/10/2022]
Abstract
A halophilic bacterium Halolactibacillus sp. SK71 producing extracellular glucoamylase was isolated from saline soil of Yuncheng Salt Lake, China. Enzyme production was strongly influenced by the salinity of growth medium with maximum in the presence of 5% NaCl. The glucoamylase was purified to homogeneity with a molecular mass of 78.5 kDa. It showed broad substrate specificity and raw starch hydrolyzing activity. Analysis of hydrolysis products from soluble starch by thin-layer chromatography revealed that glucose was the sole end-product, indicating the enzyme was a true glucoamylase. Optimal enzyme activity was found to be at 70°C, pH 8.0, and 7.5% NaCl. In addition, it was highly active and stable over broad ranges of temperature (0-100°C), pH (7.0-12.0), and NaCl concentration (0-20%), showing excellent thermostable, alkali stable, and halotolerant properties. Furthermore, it displayed high stability in the presence of hydrophobic organic solvents. The purified glucoamylase was applied for raw corn starch hydrolysis and subsequent bioethanol production using Saccharomyces cerevisiae. The yield in terms of grams of ethanol produced per gram of sugar consumed was 0.365 g/g, with 71.6% of theoretical yield from raw corn starch. This study demonstrated the feasibility of using enzymes from halophiles for further application in bioenergy production.
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Affiliation(s)
- Hui-Ying Yu
- Life Science College, Yuncheng University, 1155 Fudan West Street, Yuncheng, 044000, Shanxi, China
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Improvement of Hydrolysis and Fermentation of Sugarcane Bagasse by Soaking in Aqueous Ammonia and Methanolic Ammonia. Biosci Biotechnol Biochem 2014; 77:1379-83. [DOI: 10.1271/bbb.120867] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Current challenges in commercially producing biofuels from lignocellulosic biomass. ISRN BIOTECHNOLOGY 2014; 2014:463074. [PMID: 25937989 PMCID: PMC4393053 DOI: 10.1155/2014/463074] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Accepted: 02/19/2014] [Indexed: 11/17/2022]
Abstract
Biofuels that are produced from biobased materials are a good alternative to petroleum based fuels. They offer several benefits to society and the environment. Producing second generation biofuels is even more challenging than producing first generation biofuels due the complexity of the biomass and issues related to producing, harvesting, and transporting less dense biomass to centralized biorefineries. In addition to this logistic challenge, other challenges with respect to processing steps in converting biomass to liquid transportation fuel like pretreatment, hydrolysis, microbial fermentation, and fuel separation still exist and are discussed in this review. The possible coproducts that could be produced in the biorefinery and their importance to reduce the processing cost of biofuel are discussed. About $1 billion was spent in the year 2012 by the government agencies in US to meet the mandate to replace 30% existing liquid transportation fuels by 2022 which is 36 billion gallons/year. Other countries in the world have set their own targets to replace petroleum fuel by biofuels. Because of the challenges listed in this review and lack of government policies to create the demand for biofuels, it may take more time for the lignocellulosic biofuels to hit the market place than previously projected.
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Matsakas L, Kekos D, Loizidou M, Christakopoulos P. Utilization of household food waste for the production of ethanol at high dry material content. BIOTECHNOLOGY FOR BIOFUELS 2014; 7:4. [PMID: 24401142 PMCID: PMC3892076 DOI: 10.1186/1754-6834-7-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Accepted: 12/24/2013] [Indexed: 05/15/2023]
Abstract
BACKGROUND Environmental issues and shortage of fossil fuels have turned the public interest to the utilization of renewable, environmentally friendly fuels, such as ethanol. In order to minimize the competition between fuels and food production, researchers are focusing their efforts to the utilization of wastes and by-products as raw materials for the production of ethanol. household food wastes are being produced in great quantities in European Union and their handling can be a challenge. Moreover, their disposal can cause severe environmental issues (for example emission of greenhouse gasses). On the other hand, they contain significant amounts of sugars (both soluble and insoluble) and they can be used as raw material for the production of ethanol. RESULTS Household food wastes were utilized as raw material for the production of ethanol at high dry material consistencies. A distinct liquefaction/saccharification step has been included to the process, which rapidly reduced the viscosity of the high solid content substrate, resulting in better mixing of the fermenting microorganism. This step had a positive effect in both ethanol production and productivity, leading to a significant increase in both values, which was up to 40.81% and 4.46 fold, respectively. Remaining solids (residue) after fermentation at 45% w/v dry material (which contained also the unhydrolyzed fraction of cellulose), were subjected to a hydrothermal pretreatment in order to be utilized as raw material for a subsequent ethanol fermentation. This led to an increase of 13.16% in the ethanol production levels achieving a final ethanol yield of 107.58 g/kg dry material. CONCLUSIONS In conclusion, the ability of utilizing household food waste for the production of ethanol at elevated dry material content has been demonstrated. A separate liquefaction/saccharification process can increase both ethanol production and productivity. Finally, subsequent fermentation of the remaining solids could lead to an increase of the overall ethanol production yield.
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Affiliation(s)
- Leonidas Matsakas
- Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 5 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
- Department of Civil, Biochemical and Chemical Process Engineering, Division of Sustainable Process Engineering, Environmental and Natural Resources Engineering, Luleå University of Technology, SE 971 87 Luleå, Sweden
| | - Dimitris Kekos
- Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 5 Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
| | - Maria Loizidou
- Unit of Environmental Science and Technology, School of Chemical Engineering, National Technical University of Athens, 5, Iroon Polytechniou Str, Zografou Campus, 15780 Athens, Greece
| | - Paul Christakopoulos
- Department of Civil, Biochemical and Chemical Process Engineering, Division of Sustainable Process Engineering, Environmental and Natural Resources Engineering, Luleå University of Technology, SE 971 87 Luleå, Sweden
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30
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Ying TY, Teong LK, Abdullah WNW, Peng LC. The Effect of Various Pretreatment Methods on Oil Palm Empty Fruit Bunch (EFB) and Kenaf Core Fibers for Sugar Production. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.proenv.2014.03.041] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Sun Z, Ge X, Xin D, Zhang J. Hydrolyzabilities of different corn stover fractions after aqueous ammonia pretreatment. Appl Biochem Biotechnol 2013; 172:1506-16. [PMID: 24222503 DOI: 10.1007/s12010-013-0643-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Accepted: 10/30/2013] [Indexed: 10/26/2022]
Abstract
The effect of aqueous ammonia pretreatment on the hydrolysis of different corn stover fractions (rind, husk, leaf, and pith) by xylanase (XYL) with cellulases (CELs) was evaluated. The aqueous ammonia pretreatment had excellent delignification ability (above 66%) for different corn stover fractions. The corn rind exhibited the lowest susceptibility to aqueous ammonia pretreatment. The pretreated rind showed the lowest hydrolyzability by CEL and XYL, which was supported by a high content of crystalline cellulose in the hydrolyzed residues of rind, as confirmed by X-ray diffraction (XRD). With the addition of 1 mg XYL/g dry matter, a high glucose yield (above 90%) could be obtained from the pretreated rind by CEL. The results revealed that a high hydrolyzate yield of corn rind after aqueous ammonia pretreatment could be obtained with 1 mg xylanase/g dry matter, showing that aqueous ammonia pretreatment and xylanase addition to cellulases have great potential for the efficient hydrolysis of corn stover without previous fractionation.
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Affiliation(s)
- Zongping Sun
- College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling, 712100, China
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32
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Hongdan Z, Shaohua X, Shubin W. Enhancement of enzymatic saccharification of sugarcane bagasse by liquid hot water pretreatment. BIORESOURCE TECHNOLOGY 2013; 143:391-6. [PMID: 23819975 DOI: 10.1016/j.biortech.2013.05.103] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 05/24/2013] [Accepted: 05/24/2013] [Indexed: 05/21/2023]
Abstract
Lignocellulosic biomass can be utilized to produce promising biofuels. In this study, liquid hot water pretreatments were performed to break the intricate structure of sugarcane bagasse, which resists the enzyme accessibility to cellulose. The effects of temperatures and times on the hemicellulose degradation (including the yields of pentoses and hexoses, the proportion of monomers and oligosaccharides, as well as limited inhibitors) and cellulose enzymatic digestibility were evaluated. The results indicated that the maximum xylose yields (combined 3.85 g xylose and 13.21 g xylo-oligosaccharides per 100 g raw material) in prehydrolyzate liquid were obtained at 180 °C and 30 min. Due to the effective removal of hemicellulose, the maximum glucose yield in enzyme hydrolyzate reached 37.27 g per 100 g raw material, representing 90.13% of glucose in the sugarcane bagasse. The maximal total sugars yield (combined prehydrolyzate and enzymatic hydrolyzate) were 53.65 g based on 100 g raw material.
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Affiliation(s)
- Zhang Hongdan
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, PR China
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33
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Shrestha RK, Hur O, Kim TH. Pretreatment of Corn Stover for Improved Enzymatic Saccharification using Ammonia Circulation Reactor (ACR). KOREAN CHEMICAL ENGINEERING RESEARCH 2013. [DOI: 10.9713/kcer.2013.51.3.335] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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34
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Deutschmann R, Dekker RF. From plant biomass to bio-based chemicals: Latest developments in xylan research. Biotechnol Adv 2012; 30:1627-40. [DOI: 10.1016/j.biotechadv.2012.07.001] [Citation(s) in RCA: 195] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Revised: 06/12/2012] [Accepted: 07/01/2012] [Indexed: 11/26/2022]
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35
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Peng F, Peng P, Xu F, Sun RC. Fractional purification and bioconversion of hemicelluloses. Biotechnol Adv 2012; 30:879-903. [PMID: 22306329 DOI: 10.1016/j.biotechadv.2012.01.018] [Citation(s) in RCA: 185] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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36
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Tye YY, Lee KT, Wan Abdullah WN, Leh CP. Potential of Ceiba pentandra (L.) Gaertn. (kapok fiber) as a resource for second generation bioethanol: effect of various simple pretreatment methods on sugar production. BIORESOURCE TECHNOLOGY 2012; 116:536-539. [PMID: 22595099 DOI: 10.1016/j.biortech.2012.04.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 04/06/2012] [Accepted: 04/09/2012] [Indexed: 05/31/2023]
Abstract
The importance of bioethanol currently has increased tremendously as it can reduce the total dependency on fossil-fuels, especially gasoline, in the transportation sector. In this study, Ceiba pentandra (kapok fiber) was introduced as a new resource for bioethanol production. The results of chemical composition analysis showed that the cellulose (alpha- and beta-) contents were 50.7%. The glucose composition of the fiber was 59.8%. The high glucose content indicated that kapok fiber is a potential substrate for bioethanol production. However, without a pretreatment, the kapok fiber only yielded 0.8% of reducing sugar by enzymatic hydrolysis. Thus, it is necessary to pre-treat the kapok fiber prior to hydrolysis. Taking into account environmentally friendliness, only simple pretreatments with minimum chemical or energy consumption was considered. It was interesting to see that by adopting merely water, acid and alkaline pretreatments, the yield of reducing sugar was increased to 39.1%, 85.2% and >100%, respectively.
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Affiliation(s)
- Ying Ying Tye
- School of Industrial Technology, Universiti Sains Malaysia, Minden, 11800 Penang, Malaysia
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37
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Yanase H, Miyawaki H, Sakurai M, Kawakami A, Matsumoto M, Haga K, Kojima M, Okamoto K. Ethanol production from wood hydrolysate using genetically engineered Zymomonas mobilis. Appl Microbiol Biotechnol 2012; 94:1667-78. [DOI: 10.1007/s00253-012-4094-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2011] [Revised: 04/01/2012] [Accepted: 04/10/2012] [Indexed: 10/28/2022]
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38
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Srikrishnan S, Randall A, Baldi P, Da Silva NA. Rationally selected single-site mutants of the Thermoascus aurantiacus endoglucanase increase hydrolytic activity on cellulosic substrates. Biotechnol Bioeng 2012; 109:1595-9. [PMID: 22180009 DOI: 10.1002/bit.24414] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2011] [Revised: 11/29/2011] [Accepted: 12/05/2011] [Indexed: 11/09/2022]
Abstract
Variants of the Thermoascus aurantiacus Eg1 enzyme with higher catalytic efficiency than wild-type were obtained via site-directed mutagenesis. Using a rational mutagenesis approach based on structural bioinformatics and evolutionary analysis, two positions (F16S and Y95F) were identified as priority sites for mutagenesis. The mutant and parent enzymes were expressed and secreted from Pichia pastoris and the single site mutants F16S and Y95F showed 1.7- and 4.0-fold increases in k(cat) and 1.5- and 2.5-fold improvements in hydrolytic activity on cellulosic substrates, respectively, while maintaining thermostability. Similar to the parent enzyme, the two variants were active between pH 4.0 and 8.0 and showed optimal activity at temperature 70°C at pH 5.0. The purified enzymes were active at 50°C for over 12 h and retained at least 80% of initial activity for 2 h at 70°C. In contrast to the improved hydrolysis seen with the single mutation enzymes, no improvement was observed with a third variant carrying a combination of both mutations, which instead showed a 60% reduction in catalytic efficiency. This work further demonstrates that non-catalytic amino acid residues can be engineered to enhance catalytic efficiency in pretreatment enzymes of interest.
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Affiliation(s)
- Sneha Srikrishnan
- Department of Chemical Engineering and Materials Science, The Henry Samueli School of Engineering, University of California, Irvine, California, USA
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39
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Bioconversion of corn stover derived pentose and hexose to ethanol using cascade simultaneous saccharification and fermentation (CSSF). Bioprocess Biosyst Eng 2011; 35:99-104. [DOI: 10.1007/s00449-011-0617-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2011] [Accepted: 07/19/2011] [Indexed: 10/17/2022]
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40
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Alvira P, Tomás-Pejó E, José Negro M, Ballesteros AM. Strategies of xylanase supplementation for an efficient saccharification and cofermentation process from pretreated wheat straw. Biotechnol Prog 2011; 27:944-50. [DOI: 10.1002/btpr.623] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 03/14/2011] [Indexed: 11/06/2022]
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41
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Cho DH, Shin SJ, Bae Y, Park C, Kim YH. Ethanol production from acid hydrolysates based on the construction and demolition wood waste using Pichia stipitis. BIORESOURCE TECHNOLOGY 2011; 102:4439-4443. [PMID: 21251816 DOI: 10.1016/j.biortech.2010.12.094] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 12/23/2010] [Accepted: 12/23/2010] [Indexed: 05/30/2023]
Abstract
The feasibility of ethanol production from the construction and demolition (C&D) wood waste acid hydrolysates was investigated. The chemical compositions of the classified C&D wood waste were analyzed. Concentrated sulfuric acid hydrolysis was used to obtain the saccharide hydrolysates and the inhibitors in the hydrolysates were also analyzed. The C&D wood waste composed of lumber, plywood, particleboard, and medium density fiberboard (MDF) had polysaccharide (cellulose, xylan, and glucomannan) fractions of 60.7-67.9%. The sugar composition (glucose, xylose, and mannose) of the C&D wood wastes varied according to the type of wood. The additives used in the wood processing did not appear to be released into the saccharide solution under acid hydrolysis. Although some fermentation inhibitors were detected in the hydrolysates, they did not affect the ethanol production by Pichia stipitis. The hexose sugar-based ethanol yield and ethanol yield efficiency were 0.42-0.46 g ethanol/g substrate and 84.7-90.7%, respectively. Therefore, the C&D wood wastes dumped in landfill sites could be used as a raw material feedstock for the production of bioethanol.
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Affiliation(s)
- Dae Haeng Cho
- Department of Chemical Engineering, Kwangwoon University, Seoul 139-701, Republic of Korea
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42
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Alvira P, Negro MJ, Ballesteros M. Effect of endoxylanase and α-L-arabinofuranosidase supplementation on the enzymatic hydrolysis of steam exploded wheat straw. BIORESOURCE TECHNOLOGY 2011; 102:4552-8. [PMID: 21262567 DOI: 10.1016/j.biortech.2010.12.112] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 12/28/2010] [Accepted: 12/30/2010] [Indexed: 05/10/2023]
Abstract
The cost and hydrolytic efficiency of enzymes are major factors that restrict the commercialization of the bioethanol production process from lignocellulosic biomass. Hemicellulases and other accessory enzymes are becoming crucial to increase enzymatic hydrolysis (EH) yields at low cellulase dosages. The aim of this work was to evaluate the effect of two recombinant hemicellulolytic enzymes on the EH of steam pretreated wheat straw. Pretreatments at two severity conditions were performed and the whole slurry obtained after steam explosion pretreatment was employed as substrate. An endoxylanase (Xln C) from Aspergillus nidulans and an α-L-arabinofuranosidase (AF) from Aspergillus niger, have been applied in combination with cellulase enzymes. A degree of synergism of 29.5% and increases up to 10% in the EH yields were obtained, showing the potential of accessory activities to improve the EH step and make the whole process more effective.
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Affiliation(s)
- P Alvira
- CIEMAT-Renewable Energies Division, Biofuels Unit, Av. Complutense 22, 28040 Madrid, Spain.
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43
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Byrt CS, Grof CPL, Furbank RT. C4 plants as biofuel feedstocks: optimising biomass production and feedstock quality from a lignocellulosic perspective. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2011; 53:120-35. [PMID: 21205189 DOI: 10.1111/j.1744-7909.2010.01023.x] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
The main feedstocks for bioethanol are sugarcane (Saccharum officinarum) and maize (Zea mays), both of which are C(4) grasses, highly efficient at converting solar energy into chemical energy, and both are food crops. As the systems for lignocellulosic bioethanol production become more efficient and cost effective, plant biomass from any source may be used as a feedstock for bioethanol production. Thus, a move away from using food plants to make fuel is possible, and sources of biomass such as wood from forestry and plant waste from cropping may be used. However, the bioethanol industry will need a continuous and reliable supply of biomass that can be produced at a low cost and with minimal use of water, fertilizer and arable land. As many C(4) plants have high light, water and nitrogen use efficiency, as compared with C(3) species, they are ideal as feedstock crops. We consider the productivity and resource use of a number of candidate plant species, and discuss biomass 'quality', that is, the composition of the plant cell wall.
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Affiliation(s)
- Caitlin S Byrt
- School of Environmental and Life Sciences, University of Newcastle, University Drive, Callaghan, NSW 2308, Australia
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44
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Production of Astaxanthin from Cellulosic Biomass Sugars by Mutants of the Yeast Phaffia rhodozyma. Appl Biochem Biotechnol 2011; 164:655-65. [DOI: 10.1007/s12010-011-9165-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Accepted: 01/10/2011] [Indexed: 10/18/2022]
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45
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Watanabe T, Watanabe I, Yamamoto M, Ando A, Nakamura T. A UV-induced mutant of Pichia stipitis with increased ethanol production from xylose and selection of a spontaneous mutant with increased ethanol tolerance. BIORESOURCE TECHNOLOGY 2011; 102:1844-1848. [PMID: 20947339 DOI: 10.1016/j.biortech.2010.09.087] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Revised: 09/13/2010] [Accepted: 09/17/2010] [Indexed: 05/30/2023]
Abstract
In the fermentation process of lignocellulosic biomass (such as wood and rice straw), efficient conversion of pentose (mainly xylose) into ethanol is important. Mutants of Pichia stipitis NBRC1687 were obtained after UV mutagenesis and selection of large colonies on ethanol-containing medium. One mutant, PXF58, produced 4.3% ethanol from 11.4% xylose while the parent strain only produced 3.1%. The ethanol productivities of PXF58 from glucose and fructose were about were about 1.4-fold higher than those of the parent strain. After continuous cultivation of PXF58 in YNB (yeast nitrogen base) medium containing 2% xylose and 5-7% ethanol, an ethanol-tolerant mutant, PET41, was obtained. Strain PET41 was able to produce 4.4% ethanol when first supplied with xylose then with glucose. This isolate might be thus useful for two-phase fermentation in which xylan is saccharified by xylanase to produce xylose, and glucan is saccharified later by cellulase and β-glucosidase to produce glucose.
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Affiliation(s)
- Takashi Watanabe
- National Food Research Institute, National Agriculture and Food Research Organization (NARO), 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan
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46
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Lee SE, Park BS, Yoon JJ. Proteomic Evaluation of Cellular Responses of Saccharomyces cerevisiae to Formic Acid Stress. MYCOBIOLOGY 2010; 38:302-9. [PMID: 23956670 PMCID: PMC3741523 DOI: 10.4489/myco.2010.38.4.302] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 11/25/2010] [Indexed: 05/07/2023]
Abstract
Formic acid is a representative carboxylic acid that inhibits bacterial cell growth, and thus it is generally considered to constitute an obstacle to the reuse of renewable biomass. In this study, Saccharomyces cerevisiae was used to elucidate changes in protein levels in response to formic acid. Fifty-seven differentially expressed proteins in response to formic acid toxicity in S. cerevisiae were identified by 1D-PAGE and nano-liquid chromatography-tandem mass spectrometry (nano-LC-MS/MS) analyses. Among the 28 proteins increased in expression, four were involved in the MAP kinase signal transduction pathway and one in the oxidative stress-induced pathway. A dramatic increase was observed in the number of ion transporters related to maintenance of acid-base balance. Regarding the 29 proteins decreased in expression, they were found to participate in transcription during cell division. Heat shock protein 70, glutathione reductase, and cytochrome c oxidase were measured by LC-MS/MS analysis. Taken together, the inhibitory action of formic acid on S. cerevisiae cells might disrupt the acid-base balance across the cell membrane and generate oxidative stress, leading to repressed cell division and death. S. cerevisiae also induced expression of ion transporters, which may be required to maintain the acid-base balance when yeast cells are exposed to high concentrations of formic acid in growth medium.
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Affiliation(s)
- Sung-Eun Lee
- Research Station, Nanotoxtech Inc., Ansan 426-901, Korea
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47
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Hector RE, Dien BS, Cotta MA, Qureshi N. Engineering industrial Saccharomyces cerevisiae strains for xylose fermentation and comparison for switchgrass conversion. J Ind Microbiol Biotechnol 2010; 38:1193-202. [PMID: 21107642 DOI: 10.1007/s10295-010-0896-1] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2010] [Accepted: 10/29/2010] [Indexed: 11/28/2022]
Abstract
Saccharomyces' physiology and fermentation-related properties vary broadly among industrial strains used to ferment glucose. How genetic background affects xylose metabolism in recombinant Saccharomyces strains has not been adequately explored. In this study, six industrial strains of varied genetic background were engineered to ferment xylose by stable integration of the xylose reductase, xylitol dehydrogenase, and xylulokinase genes. Aerobic growth rates on xylose were 0.04-0.17 h(-1). Fermentation of xylose and glucose/xylose mixtures also showed a wide range of performance between strains. During xylose fermentation, xylose consumption rates were 0.17-0.31 g/l/h, with ethanol yields 0.18-0.27 g/g. Yields of ethanol and the metabolite xylitol were positively correlated, indicating that all of the strains had downstream limitations to xylose metabolism. The better-performing engineered and parental strains were compared for conversion of alkaline pretreated switchgrass to ethanol. The engineered strains produced 13-17% more ethanol than the parental control strains because of their ability to ferment xylose.
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Affiliation(s)
- Ronald E Hector
- U.S. Department of Agriculture, Bioenergy Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, 1815 North University Street, Peoria, IL 61604, USA.
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