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Shah S, Lai J, Basuli F, Martinez-Orengo N, Patel R, Turner ML, Wang B, Shi ZD, Sourabh S, Peiravi M, Lyndaker A, Liu S, Seyedmousavi S, Williamson PR, Swenson RE, Hammoud DA. Development and preclinical validation of 2-deoxy 2-[ 18F]fluorocellobiose as an Aspergillus-specific PET tracer. Sci Transl Med 2024; 16:eadl5934. [PMID: 39141701 DOI: 10.1126/scitranslmed.adl5934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Accepted: 07/24/2024] [Indexed: 08/16/2024]
Abstract
The global incidence of invasive fungal infections (IFIs) has increased over the past few decades, mainly in immunocompromised patients, and is associated with high mortality and morbidity. Aspergillus fumigatus is one of the most common and deadliest IFI pathogens. Major hurdles to treating fungal infections remain the lack of rapid and definitive diagnosis, including the frequent need for invasive procedures to provide microbiological confirmation, and the lack of specificity of structural imaging methods. To develop an Aspergillus-specific positron emission tomography (PET) imaging agent, we focused on fungal-specific sugar metabolism. We radiolabeled cellobiose, a disaccharide known to be metabolized by Aspergillus species, and synthesized 2-deoxy-2-[18F]fluorocellobiose ([18F]FCB) by enzymatic conversion of 2-deoxy-2-[18F]fluoroglucose ([18F]FDG) with a radiochemical yield of 60 to 70%, a radiochemical purity of >98%, and 1.5 hours of synthesis time. Two hours after [18F]FCB injection in A. fumigatus pneumonia as well as A. fumigatus, bacterial, and sterile inflammation myositis mouse models, retained radioactivity was only seen in foci with live A. fumigatus infection. In vitro testing confirmed production of β-glucosidase enzyme by A. fumigatus and not by bacteria, resulting in hydrolysis of [18F]FCB into glucose and [18F]FDG, the latter being retained by the live fungus. The parent molecule was otherwise promptly excreted through the kidneys, resulting in low background radioactivity and high target-to-nontarget ratios at A. fumigatus infectious sites. We conclude that [18F]FCB is a promising and clinically translatable Aspergillus-specific PET tracer.
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Affiliation(s)
- Swati Shah
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Jianhao Lai
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Falguni Basuli
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute (NHLBI), NIH, Rockville, MD 20852, USA
| | - Neysha Martinez-Orengo
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Reema Patel
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Mitchell L Turner
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Benjamin Wang
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Zhen-Dan Shi
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute (NHLBI), NIH, Rockville, MD 20852, USA
| | - Suman Sourabh
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Morteza Peiravi
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Anna Lyndaker
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
| | - Sichen Liu
- National Institute of Allergy and Infectious Diseases (NIAID), NIH, Bethesda, MD 20852, USA
| | | | - Peter R Williamson
- Laboratory of Clinical Immunology and Microbiology (LCIM), NIAID, NIH, Bethesda, MD 20852, USA
| | - Rolf E Swenson
- Chemistry and Synthesis Center, National Heart, Lung, and Blood Institute (NHLBI), NIH, Rockville, MD 20852, USA
| | - Dima A Hammoud
- Center for Infectious Disease Imaging (CIDI), Radiology and Imaging Sciences, Clinical Center (CC), National Institutes of Health (NIH), Bethesda, MD 20852, USA
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Erkanli ME, El-Halabi K, Kim JR. Exploring the diversity of β-glucosidase: Classification, catalytic mechanism, molecular characteristics, kinetic models, and applications. Enzyme Microb Technol 2024; 173:110363. [PMID: 38041879 DOI: 10.1016/j.enzmictec.2023.110363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Revised: 11/17/2023] [Accepted: 11/18/2023] [Indexed: 12/04/2023]
Abstract
High-value chemicals and energy-related products can be produced from biomass. Biorefinery technology offers a sustainable and cost-effective method for this high-value conversion. β-glucosidase is one of the key enzymes in biorefinery processes, catalyzing the production of glucose from aryl-glycosides and cello-oligosaccharides via the hydrolysis of β-glycosidic bonds. Although β-glucosidase plays a critical catalytic role in the utilization of cellulosic biomass, its efficacy is often limited by substrate or product inhibitions, low thermostability, and/or insufficient catalytic activity. To provide a detailed overview of β-glucosidases and their benefits in certain desired applications, we collected and summarized extensive information from literature and public databases, covering β-glucosidases in different glycosidase hydrolase families and biological kingdoms. These β-glucosidases show differences in amino acid sequence, which are translated into varying degrees of the molecular properties critical in enzymatic applications. This review describes studies on the diversity of β-glucosidases related to the classification, catalytic mechanisms, key molecular characteristics, kinetics models, and applications, and highlights several β-glucosidases displaying high stability, activity, and resistance to glucose inhibition suitable for desired biotechnological applications.
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Affiliation(s)
- Mehmet Emre Erkanli
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States
| | - Khalid El-Halabi
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States
| | - Jin Ryoun Kim
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States.
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3
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Immobilization of an Industrial β-Glucosidase from Aspergillus fumigatus and Its Use for Cellobiose Hydrolysis. Processes (Basel) 2022. [DOI: 10.3390/pr10061225] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In this study, several covalent methods of immobilization based on acrylic supports, Schiff bases and epoxides have been applied to a commercial cocktail with a high β-glucosidase activity secreted by Aspergillus fumigatus. This cocktail was preliminary compared to a commercial secretome of Aspergillus niger, which was also subjected to the aforementioned immobilization methods. Due to its higher activity, the cocktail from A. fumigatus immobilized on ReliZyme™ HA403 activated with glutaraldehyde was employed for pNPG and cellobiose hydrolysis in diverse operational conditions and at diverse enzyme loadings, showing a very high activity at high enzyme load. A kinetic model based on the Michaelis–Menten hypothesis, in which double inhibition occurs due to glucose, has been selected upon fitting it to all experimentally retrieved data with the lowest-activity immobilized enzyme. This model was compared to the one previously established for the free form of the enzyme, observing that cellobiose acompetitive inhibition does not exist with the immobilized enzyme acting as the biocatalyst. In addition, stability studies indicated that the immobilized enzyme intrinsically behaves as the free enzyme, as expected for a one-bond low-interaction protein-support immobilization.
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4
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Urbanek AK, Arroyo M, de la Mata I, Mirończuk AM. Identification of novel extracellular putative chitinase and hydrolase from Geomyces sp. B10I with the biodegradation activity towards polyesters. AMB Express 2022; 12:12. [PMID: 35122534 PMCID: PMC8818076 DOI: 10.1186/s13568-022-01352-7] [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: 10/19/2021] [Accepted: 01/22/2022] [Indexed: 11/10/2022] Open
Abstract
Cold-adapted filamentous fungal strain Geomyces sp. B10I has been reported to decompose polyesters such as poly(e-caprolactone) (PCL), poly(butylene succinate) (PBS) and poly(butylene succinate-co-butylene adipate) (PBSA). Here, we identified the enzymes of Geomyces sp. B10I, which appear to be responsible for its biodegradation activity. We compared their amino acid sequences with sequences of well-studied fungal enzymes. Partial purification of an extracellular mixture of the two enzymes, named hydrGB10I and chitGB10I, using ammonium sulfate precipitation and ionic exchange chromatography gave 14.16-fold purity. The amino acid sequence of the proteins obtained from the MALDI-TOF analysis determined the molecular mass of 77.2 kDa and 46.5 kDa, respectively. Conserved domain homology analysis revealed that both proteins belong to the class of hydrolases; hydrGB10I belongs to the glycosyl hydrolase 81 superfamily, while chitGB10I contains the domain of the glycosyl hydrolase 18 superfamily. Phylogenetic analysis suggests a distinct nature of the hydrGB10I and chitGB10I of Geomyces sp. B10I when compared with other fungal polyester-degrading enzymes described to date.
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5
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Immobilization-Stabilization of β-Glucosidase for Implementation of Intensified Hydrolysis of Cellobiose in Continuous Flow Reactors. Catalysts 2022. [DOI: 10.3390/catal12010080] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Cellulose saccharification to glucose is an operation of paramount importance in the bioenergy sector and the chemical and food industries, while glucose is a critical platform chemical in the integrated biorefinery. Among the cellulose degrading enzymes, β-glucosidases are responsible for cellobiose hydrolysis, the final step in cellulose saccharification, which is usually the critical bottleneck for the whole cellulose saccharification process. The design of very active and stable β-glucosidase-based biocatalysts is a key strategy to implement an efficient saccharification process. Enzyme immobilization and reaction engineering are two fundamental tools for its understanding and implementation. Here, we have designed an immobilized-stabilized solid-supported β-glucosidase based on the glyoxyl immobilization chemistry applied in porous solid particles. The biocatalyst was stable at operational temperature and highly active, which allowed us to implement 25 °C as working temperature with a catalyst productivity of 109 mmol/min/gsupport. Cellobiose degradation was implemented in discontinuous stirred tank reactors, following which a simplified kinetic model was applied to assess the process limitations due to substrate and product inhibition. Finally, the reactive process was driven in a continuous flow fixed-bed reactor, achieving reaction intensification under mild operation conditions, reaching full cellobiose conversion of 34 g/L in a reaction time span of 20 min.
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Lorente-Arevalo A, Garcia-Martin A, Ladero M, Bolivar JM. Chemical Reaction Engineering to Understand Applied Kinetics in Free Enzyme Homogeneous Reactors. Methods Mol Biol 2022; 2397:277-320. [PMID: 34813070 DOI: 10.1007/978-1-0716-1826-4_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Chemical reaction engineering is interested in elucidating the reaction kinetics through the determination of the fundamental influencing variables. The understanding of enzyme kinetics is needed to implement the potential of enzymes to satisfy determined production targets and for the design of the reactor. The quantification of the enzyme kinetics is implemented by the elucidation and building of the kinetic model (it includes one or more kinetic equations). In the context of process development, the kinetic model is not only useful to identify feasibility and for optimizing reaction conditions but also, at an early stage of development it is very useful to anticipate implementation bottlenecks, and so guide reactor setup. In this chapter we describe theoretical and practical considerations to illustrate the methodological framework of kinetic analysis. We take as study cases four archetypal kinetic cases by using as example the hydrolysis of cellobiose catalyzed by a beta-glucosidase. We show the different experimental data that can be obtained by the monitoring of enzymatic reactions in different configuration of free enzyme homogeneous ideal reactors; we show step-by-step the visualization, treatment, and analysis of data to elucidate kinetic models and the procedure for the quantification of kinetic constants. Finally, the performance of different reactors is compared in the interplay with the enzyme kinetics. This book chapter aims at being useful for a broad multidisciplinary audience and different levels of academic development.
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Affiliation(s)
- Alvaro Lorente-Arevalo
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Madrid, Spain
| | - Alberto Garcia-Martin
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Madrid, Spain
| | - Miguel Ladero
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Madrid, Spain.
| | - Juan M Bolivar
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Madrid, Spain.
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7
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Zhang F, You S, Huang T, Wang JZ, Zhu LL, Wang B, Ye WS, Herman RA, Luo H, Wang J. Dual promoter strategy enhances co-expression of α-L-rhamnosidase and enhanced fluorescent protein for whole-cell catalysis and bioresource valorization. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 722:137865. [PMID: 32192973 DOI: 10.1016/j.scitotenv.2020.137865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 02/17/2020] [Accepted: 03/10/2020] [Indexed: 06/10/2023]
Abstract
Developing circular economy is the only way to improve the efficiency of resource utilization. Whole-cell catalysis is an effective method to recycle enzymes, improve catalytic efficiency, and reduce production costs. The enzyme, α-L-rhamnosidase has considerable application prospects in the field of biocatalysis as it can hydrolyze a variety of α-L rhamnoses. In the present study, the genes for α-L-rhamnosidase (rhaB1) and enhanced fluorescent protein (EGFP) were co-expressed using a bi-promoter expression vector pRSFDuet1 and their enzymatic properties were evaluated. To our knowledge, this study has established an effective rhamnosidase-fluorescent indicator and whole-cell catalytic system for the first time. Moreover, we analyzed the change in the activity of the crude rhaB1-EGFP as well as its whole-cell during the biocatalysis process using fluorescence intensity. Recombinant rhaB1-EGFP as a product which contains rhaB1 and EGFP showed higher thermal stability, pH stability, and conversion efficiency than rhaB1, and its optimum temperature for rutin catalysis was ideal for industrial applications. Moreover, under the optimal conditions of a rutin concentration of 0.05 g/L, pH of 6.0, temperature of 40 °C, a yield of 92.5% was obtained. Furthermore, we demonstrated the relationship between the fluorescence intensity and enzyme activity. This study established a highly efficient whole-cell catalytic system whose activity can be evaluated by fluorescence intensity, providing a reference for enzyme recycling.
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Affiliation(s)
- Fan Zhang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Shuai You
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China; Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, PR China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Zhenjiang 212018, PR China; Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, Zhenjiang 212018, PR China
| | - Ting Huang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Jin-Zheng Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Lin-Lin Zhu
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Bo Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Wang-Sheng Ye
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Richard Ansah Herman
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China
| | - Heng Luo
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China; Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, PR China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Zhenjiang 212018, PR China; Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, Zhenjiang 212018, PR China
| | - Jun Wang
- School of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China; Sericultural Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212018, PR China; Key Laboratory of Silkworm and Mulberry Genetic Improvement, Ministry of Agriculture and Rural Affairs, Zhenjiang 212018, PR China; Jiangsu Key Laboratory of Sericultural Biology and Biotechnology, Zhenjiang 212018, PR China.
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8
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Yang Y, Wang J, Guo H, Cao Y. The enzymatic characters of heterologous expressed novel β-1, 4-glucosidase originated from Aspergillus fresenii. 3 Biotech 2020; 10:239. [PMID: 32405443 DOI: 10.1007/s13205-020-02229-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 04/25/2020] [Indexed: 11/26/2022] Open
Abstract
β-1, 4-glucosidases generate glucose from cellobiose and oligosaccharides, enhancing the productivity in biorefinery and the bioconversion process as well as the nutritional value in food and feed. With the high-throughput sequencing technique, a novel β-1, 4-glucosidase, named bgl T2, containing 861 amino acid residues, was found from Aspergillus fresenii. bgl T2 belongs to the glycosyl hydrolase (GH) family 3. The bgl T2 that expressed by Komagataella phaffii X33 presented the highest activity at 55 °C and pH 5.5. The half-lives of bgl T2 under 50 °C, 55 °C, 60 °C, and 65 °C were 9 min 36 s, 4 min 22 s, 117 s, and 68 s, respectively. The bgl T2 was stable between pH 3.0 to pH 8.0. The Michaelis constant (K m) and the theoretical maximum rate (V max) of bgl T2 were 0.0007 mol/L and 9 × 10-8 mol/L/s, respectively. In a 5 L fermentation vessel, the recombinant K.phaffii X33 could yield a β-1, 4-glucosidase activity of 4.45 U/mL after 96 h methanol inducement. As an important member of cellulases, the novel bgl T2 might contribute to bioenergy, food processing, feed enrichment, and nutritional study, etc. This study also developed a path to obtain new enzymes depending on high-throughput sequencing technique.
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Affiliation(s)
- Yongzhi Yang
- State Key Laboratory of Animal Nutrition, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193 China
| | - Jian Wang
- State Key Laboratory of Animal Nutrition, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193 China
| | - Henan Guo
- State Key Laboratory of Animal Nutrition, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193 China
| | - Yunhe Cao
- State Key Laboratory of Animal Nutrition, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing, 100193 China
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Srivastava N, Rathour R, Jha S, Pandey K, Srivastava M, Thakur VK, Sengar RS, Gupta VK, Mazumder PB, Khan AF, Mishra PK. Microbial Beta Glucosidase Enzymes: Recent Advances in Biomass Conversation for Biofuels Application. Biomolecules 2019; 9:E220. [PMID: 31174354 PMCID: PMC6627771 DOI: 10.3390/biom9060220] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/28/2019] [Accepted: 05/28/2019] [Indexed: 01/10/2023] Open
Abstract
The biomass to biofuels production process is green, sustainable, and an advanced technique to resolve the current environmental issues generated from fossil fuels. The production of biofuels from biomass is an enzyme mediated process, wherein β-glucosidase (BGL) enzymes play a key role in biomass hydrolysis by producing monomeric sugars from cellulose-based oligosaccharides. However, the production and availability of these enzymes realize their major role to increase the overall production cost of biomass to biofuels production technology. Therefore, the present review is focused on evaluating the production and efficiency of β-glucosidase enzymes in the bioconversion of cellulosic biomass for biofuel production at an industrial scale, providing its mechanism and classification. The application of BGL enzymes in the biomass conversion process has been discussed along with the recent developments and existing issues. Moreover, the production and development of microbial BGL enzymes have been explained in detail, along with the recent advancements made in the field. Finally, current hurdles and future suggestions have been provided for the future developments. This review is likely to set a benchmark in the area of cost effective BGL enzyme production, specifically in the biorefinery area.
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Affiliation(s)
- Neha Srivastava
- Department of Chemical Engineering and Technology, IIT (BHU), Varanasi 221005, India.
| | - Rishabh Rathour
- Department of Bioengineering, Integral University, Lucknow 226026, India.
| | - Sonam Jha
- Department of Botany, Banaras Hindu University, Varanasi 221005, India.
| | - Karan Pandey
- Department of Chemical Engineering and Technology, IIT (BHU), Varanasi 221005, India.
| | - Manish Srivastava
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India.
| | - Vijay Kumar Thakur
- Enhanced Composites and Structures Center, School of Aerospace, Transport and Manufacturing, Cranfield University, Bedfordshire MK43 0AL, UK.
| | - Rakesh Singh Sengar
- Department of Agriculture Biotechnology, College of Agriculture, Sardar Vallabhbhai Patel, University of Agriculture and Technology, Meerut 250110, U.P., India.
| | - Vijai K Gupta
- Department of Chemistry and Biotechnology, ERA Chair of Green Chemistry, Tallinn University of Technology, 12618 Tallinn, Estonia.
| | | | - Ahamad Faiz Khan
- Department of Bioengineering, Integral University, Lucknow 226026, India.
| | - Pradeep Kumar Mishra
- Department of Chemical Engineering and Technology, IIT (BHU), Varanasi 221005, India.
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10
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Thermal and operational deactivation of Aspergillus fumigatus β-glucosidase in ethanol/water pretreated wheat straw enzymatic hydrolysis. J Biotechnol 2019; 292:32-38. [DOI: 10.1016/j.jbiotec.2019.01.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 11/25/2018] [Accepted: 01/06/2019] [Indexed: 01/13/2023]
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11
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Wojtusik M, Villar JC, Ladero M, Garcia-Ochoa F. Physico-chemical kinetic modelling of hydrolysis of a steam-explosion pre-treated corn stover: A two-step approach. BIORESOURCE TECHNOLOGY 2018; 268:592-598. [PMID: 30138871 DOI: 10.1016/j.biortech.2018.08.045] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 08/11/2018] [Accepted: 08/13/2018] [Indexed: 06/08/2023]
Abstract
A physico-chemical kinetic model for the hydrolysis of pre-treated corn stover is proposed. This model takes into account two reactions in series, the hydrolysis of cellulose to cellobiose and the production of glucose from cellobiose. Experiments have been carried out with an industrial enzymatic cocktail from Trichoderma reesei containing endo and exoglucanases and a very low activity of β-glucosidase. Kinetic parameters were calculated by fitting the proposed model to experimental data of cellulose and glucose concentrations with time. The kinetic parameters fulfilled all relevant statistical and physical criteria. The kinetic model has been validated with published saccharification data regarding differently pre-treated corn stover and enzymatic cocktail, in this case with a very high β-glucosidase activity (as it is common in modern industrial cellulase cocktails). In both cases, the kinetic model proposed could be fitted very appropriately to cellulose hydrolysis data.
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Affiliation(s)
- Mateusz Wojtusik
- Chemical and Materials Engineering Department, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Juan C Villar
- Laboratory of Cellulose and Paper, INIA, Forest Research Center, 28040 Madrid, Spain
| | - Miguel Ladero
- Chemical and Materials Engineering Department, Universidad Complutense de Madrid, 28040 Madrid, Spain.
| | - Felix Garcia-Ochoa
- Chemical and Materials Engineering Department, Universidad Complutense de Madrid, 28040 Madrid, Spain
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