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Pretreatment technologies for an efficient bioethanol production process based on enzymatic hydrolysis: A review
Abstract
Biofuel produced from lignocellulosic materials, so-called second generation bioethanol shows energetic, economic and environmental advantages in comparison to bioethanol from starch or sugar. However, physical and chemical barriers caused by the close association of the main components of lignocellulosic biomass, hinder the hydrolysis of cellulose and hemicellulose to fermentable sugars. The main goal of pretreatment is to increase the enzyme accessibility improving digestibility of cellulose. Each pretreatment has a specific effect on the cellulose, hemicellulose and lignin fraction thus, different pretreatment methods and conditions should be chosen according to the process configuration selected for the subsequent hydrolysis and fermentation steps. This paper reviews the most interesting technologies for ethanol production from lignocellulose and it points out several key properties that should be targeted for low-cost and advanced pretreatment processes.
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“Depending on the purpose of pretreatment, chemical, biological, thermochemical, or thermophysical methods are used, sometimes in combination [105, 106].”
From The promising future of microalgae: Current status, challenges, and optimization of a sustainable and renewable industry for biofuels, feed, and other products (2018) · cites this paper as [105]
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Barcelos, M. C. S., Ramos, C. L., Kuddus, M., Rodríguez‐Couto, S., Srivastava, N., Ramteke, P. W., Mishra, P. K., & Molina, G. (2020) · Biotechnology Letters · doi:10.1007/s10529-020-02957-3 · Cited by 75
Sodium carbonate–sodium sulfite pretreatment for improving the enzymatic hydrolysis of rice straw
Yang, L., Cao, J., Mao, J., & Jin, Y. (2012) · Industrial Crops and Products · doi:10.1016/j.indcrop.2012.08.027 · Cited by 75
“A promising pretreatment, which decreases the most cost in the biological conversion, should be seriously developed to support the subsequent hydrolysis and fermentation steps (Alvira et al., 2010).”
BackgroundComparative performance of precommercial cellulases hydrolyzing pretreated corn stover
McMillan, J. D., Jennings, E. W., Mohagheghi, A., & Zuccarello, M. (2011) · Biotechnology for Biofuels · doi:10.1186/1754-6834-4-29 · Cited by 75
“Background The major front-end conversion steps in biochemical platform-based production of cellulosic biofuels are pretreatment and enzymatic hydrolysis [1-3].”
BackgroundAlvira, P., Moreno, A. D., David Ibarra, A., Sáez, F., & Ballesteros, M. (2012) · Biotechnology Progress · doi:10.1002/btpr.1666 · Cited by 75
“Pretreatment of biomass is required to disrupt the lignocellulose structure, enhance cellulose accessibility to the enzymes, and increase the yields of fermentable sugars.(4) Steam-explosion pretreatment combines high pressures and temperatures and is the most commonly used method for pretreatment of lignocellulose.”
BackgroundSelf-citationEffects of hydrothermal pretreatment of sugar beet pulp for methane production
Ziemiński, K., Romanowska, I., Kowalska-Wentel, M., & Cyran, M. R. (2014) · Bioresource Technology · doi:10.1016/j.biortech.2014.05.021 · Cited by 75
“Degradation of lignocellulosic biomass is carried out using acids or bases, specific enzymes or hydrothermal treatment (Alvira et al., 2010; Zheng et al., 2013).”
MethodHigh pressure water reforming of biomass for energy and chemicals: A short review
Knez, Ž., Markočič, E., Hrnčič, M. K., Ravber, M., & Škerget, M. (2014) · The Journal of Supercritical Fluids · doi:10.1016/j.supflu.2014.06.008 · Cited by 81
Baig, K. S., Wu, J., & Turcotte, G. (2019) · International Journal of Energy Research · doi:10.1002/er.4292 · Cited by 76
“However, complete delignification is not possible because of recondensation of lignin.(88) Wan and Li(89) suggested that each pretreatment has different impacts on compositional and structural fibers of biomass.”
BackgroundBerłowska, J., Pielech‐Przybylska, K., Balcerek, M., Dziekońska‐Kubczak, U., Patelski, P., Dziugan, P., & Kręgiel, D. (2016) · BioMed Research International · doi:10.1155/2016/3154929 · Cited by 74
“Before fermentation, the cell-wall material must be degraded into fermentable monosaccharides [6].”
Wang, Z., Zhu, X., & Deuss, P. J. (2021) · Industrial Crops and Products · doi:10.1016/j.indcrop.2021.113493 · Cited by 74
Microwave Encounters Ionic Liquid: Synergistic Mechanism, Synthesis and Emerging Applications
Zhao, Z., Li, H., & Gao, X. (2023) · Chemical Reviews · doi:10.1021/acs.chemrev.3c00794 · Cited by 77
Kululo, W. W., Habtu, N. G., Abera, M. K., Sendekie, Z. B., Fanta, S. W., & Yemata, T. A. (2025) · Discover Applied Sciences · doi:10.1007/s42452-025-06748-1 · Cited by 75
“This process decreases the degree of polymerization and crystallinity of LCB and increases the accessible specific surface area [38, 72].”
He, Y.-C., Ding, Y. H., Xue, Y., Yang, B., Liu, F., Wang, C., Zhu, Z., Qing, Q., Wu, H., Zhu, C., et al. (2015) · Bioresource Technology · doi:10.1016/j.biortech.2015.06.088 · Cited by 74
“microwave, etc) have been employed to pretreated the cellulosic materials (Alvira et al., 2010; He et al., 2015b; Hendriks and Zeeman, 2009; Yang and Wyman, 2008).”
Zhao, X., Song, Y., & Liu, D. (2011) · Enzyme and Microbial Technology · doi:10.1016/j.enzmictec.2011.07.003 · Cited by 74
Sitepu, I. R., Jin, M., Fernandez, J. E., Sousa, L. D. C., Balan, V., & Boundy‐Mills, K. (2014) · Applied Microbiology and Biotechnology · doi:10.1007/s00253-014-5944-8 · Cited by 74
“There are different pretreatment technologies available to deconstruct complex polymers of plant cell walls, including acid hydrolysis, steam explosion, alkaline wet oxidation, and hot water pretreatment (Alvira et al. 2010).”
BackgroundCO 2 enabled process integration for the production of cellulosic ethanol using bionic liquids
Sun, J., Konda, N. V. S. N. M., Shi, J., Parthasarathi, R., Dutta, T., Xu, F., Scown, C. D., Simmons, B. A., & Singh, S. (2016) · Energy & Environmental Science · doi:10.1039/c6ee00913a · Cited by 74
dos Reis, T. F., de Lima, P. B. A., Parachin, N. S., Mingossi, F. B., Oliveira, J., Ries, L. N. A., & Goldman, G. H. (2016) · Biotechnology for Biofuels · doi:10.1186/s13068-016-0611-1 · Cited by 75
Principles and Development of Lignocellulosic Biomass Pretreatment for Biofuels
Zheng, Y., Shi, J., Tu, M., & Cheng, Y. (2017) · Advances in bioenergy · doi:10.1016/bs.aibe.2017.03.001 · Cited by 75
Metadata
- Authors
- Alvira, P., Tomás-Pejó, E., Ballesteros, M., & Negro, M. J.
- Affiliations
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES)
- Corresponding author
- Negro, M.J.
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2010-07
- Volume
- 101
- Issue
- 13
- Pages
- 4851-4861
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2053526929
- Cited by
- 3,912
- References
- 89
- Citations by year
- 2026: 102 · 2025: 135 · 2024: 141 · 2023: 162 · 2022: 227 · 2021: 273 · 2020: 274 · 2019: 319 · 2018: 309 · 2017: 369 · 2016: 317 · 2015: 332 · 2014: 293 · 2013: 265 · 2012: 207
- FWCI
- 78.48
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Anaerobic Digestion and Biogas Production
- Physical Sciences › Chemical Engineering › Catalysis › Catalysis for Biomass Conversion
- Keywords
- lignocellulosic biomass, bioethanol production, pretreatment technologies, enzymatic hydrolysis, cellulose digestibility, hemicellulose, lignin, fermentable sugars, cellulosic ethanol
- MeSH terms
- Adsorption, Ethanol, Ammonia, Biotechnology, Cellulose, Conservation of Natural Resources, Energy-Generating Resources, Hydrolysis, Lignin, Oxygen, Porosity, Biomass
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