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Saroj P, P M, Narasimhulu K. Enhanced reducing sugar production by blending hydrolytic enzymes from Aspergillus fumigatus to improve sugarcane bagasse hydrolysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:48085-48102. [PMID: 39017871 DOI: 10.1007/s11356-024-34246-1] [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: 09/07/2023] [Accepted: 07/02/2024] [Indexed: 07/18/2024]
Abstract
Biomass pretreatment for the production of second-generation (2G) ethanol and biochemical products is a challenging process. The present study investigated the synergistic efficiency of purified carboxymethyl cellulase (CMCase), β-glucosidase, and xylanase from Aspergillus fumigatus JCM 10253 in the hydrolysis of alkaline-pretreated sugarcane bagasse (SCB). The saccharification of pretreated SCB was optimised using a combination of CMCase and β-glucosidase (C + β; 1:1) and addition of xylanase (C + β + xyl; 1:1:1). Independent and dependent variables influencing enzymatic hydrolysis were investigated using response surface methodology (RSM). Hydrolysis using purified CMCase and β-glucosidase achieved yields of 18.72 mg/mL glucose and 6.98 mg/mL xylose. Incorporation of xylanase in saccharification increased the titres of glucose (22.83 mg/mL) and xylose (9.54 mg/mL). Furthermore, characterisation of SCB biomass by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy respectively confirmed efficient structural disintegration and revealed the degree of crystallinity and spectral characteristics. Therefore, depolymerisation of lignin to produce high-value chemicals is essential for sustainable and competitive biorefinery development.
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Affiliation(s)
- Paramjeet Saroj
- Department of Biotechnology, National Institute of Technology Warangal, Hanamkonda, 506004, Telangana, India.
| | - Manasa P
- Department of Biotechnology, National Institute of Technology Andhra Pradesh, Tadepalligudem, 534101, India
| | - Korrapati Narasimhulu
- Department of Biotechnology, National Institute of Technology Warangal, Hanamkonda, 506004, Telangana, India
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Gavande PV, Nath P, Kumar K, Ahmed N, Fontes CMGA, Goyal A. Highly efficient, processive and multifunctional recombinant endoglucanase RfGH5_4 from Ruminococcus flavefaciens FD-1 v3 for recycling lignocellulosic plant biomasses. Int J Biol Macromol 2022; 209:801-813. [PMID: 35421411 DOI: 10.1016/j.ijbiomac.2022.04.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/18/2022] [Accepted: 04/08/2022] [Indexed: 11/26/2022]
Abstract
Gene encoding endoglucanase, RfGH5_4 from R. flavefaciens FD-1 v3 was cloned, expressed in Escherichia coli BL21(DE3) cells and purified. RfGH5_4 showed molecular size 41 kDa and maximum activity at pH 5.5 and 55 °C. It was stable between pH 5.0-8.0, retaining 85% activity and between 5 °C-45 °C, retaining 75% activity, after 60 min. RfGH5_4 displayed maximum activity (U/mg) against barley β-D-glucan (665) followed by carboxymethyl cellulose (450), xyloglucan (343), konjac glucomannan (285), phosphoric acid swollen cellulose (86), beechwood xylan (21.7) and carob galactomannan (16), thereby displaying the multi-functionality. Catalytic efficiency (mL.mg-1 s-1) of RfGH5_4 against carboxymethyl cellulose (146) and konjac glucomannan (529) was significantly high. TLC and MALDI-TOF-MS analyses of RfGH5_4 treated hydrolysates of cellulosic and hemicellulosic polysaccharides displayed oligosaccharides of degree of polymerization (DP) between DP2-DP11. TLC, HPLC and Processivity-Index analyses revealed RfGH5_4 to be a processive endoglucanase as initially, for 30 min it hydrolysed cellulose to cellotetraose followed by persistent release of cellotriose and cellobiose. RfGH5_4 yielded sufficiently high Total Reducing Sugar (TRS, mg/g) from saccharification of alkali pre-treated sorghum (72), finger millet (62), sugarcane bagasse (38) and cotton (27) in a 48 h saccharification reaction. Thus, RfGH5_4 can be considered as a potential endoglucanase for renewable energy applications.
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Affiliation(s)
- Parmeshwar Vitthal Gavande
- Department of Biosciences and Bioengineering, Carbohydrate Enzyme Biotechnology Laboratory, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Priyanka Nath
- Department of Biosciences and Bioengineering, Carbohydrate Enzyme Biotechnology Laboratory, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Krishan Kumar
- Department of Biosciences and Bioengineering, Carbohydrate Enzyme Biotechnology Laboratory, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Nazneen Ahmed
- Department of Biosciences and Bioengineering, Carbohydrate Enzyme Biotechnology Laboratory, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Carlos M G A Fontes
- CIISA - Faculdade de Medicina Veterinária, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal; NZYTech - Genes & Enzymes, Estrada do Paço do Lumiar, Campus do Lumiar, Edifício, Lisbon, Portugal
| | - Arun Goyal
- Department of Biosciences and Bioengineering, Carbohydrate Enzyme Biotechnology Laboratory, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India.
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de Almeida SGC, de Mello GF, do Santos MG, da Silva DDV, Giese EC, Hassanpour M, Zhang Z, Dussán KJ. Saccharification of acid-alkali pretreated sugarcane bagasse using immobilized enzymes from Phomopsis stipata. 3 Biotech 2022; 12:39. [PMID: 35070629 PMCID: PMC8738833 DOI: 10.1007/s13205-021-03101-2] [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: 08/11/2021] [Accepted: 12/25/2021] [Indexed: 01/03/2023] Open
Abstract
In this study, a mild-temperature two-step dilute acid and alkaline pretreatment (DA-AL) process was developed to generate highly digestible cellulose pulp from sugarcane bagasse for producing fermentable sugars by novel thermophilic cellulases derived from Phomopsis stipata SC 04. First, DA pretreatment of sugarcane bagasse at 2% (w/v) H2SO4 and 121 °C for 71 min, followed by AL pretreatment at 2.2% (w/v) NaOH and 110 °C for 100 min led to the pulp containing 86% cellulose. The cellulose pulp was hydrolyzed by the immobilized P. stipata cellulase on Ca-alginate beads, following optimization of immobilization conditions. The results showed that mixing the cellulase extract and sodium alginate solutions at a volume ratio of 1:4 led to the highest immobilization efficiencies of 99.83% for β-glucosidase and 97.52% for endoglucanase while the enzyme leakage was the lowest. The use of the immobilized cellulases led to a cellulose digestibility of 30% in the initial batch and recycling of the immobilized cellulases reduced cellulose digestibility to 18% after s recycling for two times (a total of third rounds). Overall, this study provides useful information in the use of a mild pretreatment process to produce highly digestible cellulose pulp and in the immobilization of thermophilic cellulases to produce fermentable sugars from pretreated biomass. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03101-2.
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Affiliation(s)
- Sâmilla Gabriella Coelho de Almeida
- Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University-UNESP, Rua Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo 14800-060 Brazil
| | - Giuliano Formaggio de Mello
- Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University-UNESP, Rua Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo 14800-060 Brazil
| | - Miquéias Gomes do Santos
- Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University-UNESP, Rua Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo 14800-060 Brazil
| | - Débora D. Virginio da Silva
- Department of Biochemistry and Organic Chemistry, Institute of Chemistry, São Paulo State University-UNESP, Araraquara, São Paulo Brazil
| | - Ellen Cristine Giese
- Service of Extractive Metallurgy and Bioprocesses, Centre for Mineral Technology, CETEM, Rio de Janeiro, RJ Brazil
| | - Morteza Hassanpour
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology (QUT), Brisbane, QLD 4000 Australia
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000 Australia
| | - Zhanying Zhang
- Centre for Agriculture and the Bioeconomy, Faculty of Science, Queensland University of Technology (QUT), Brisbane, QLD 4000 Australia
- School of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, QLD 4000 Australia
| | - Kelly J. Dussán
- Department of Engineering, Physics and Mathematics, Institute of Chemistry, São Paulo State University-UNESP, Rua Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, São Paulo 14800-060 Brazil
- Bioenergy Research Institute (IPBEN), São Paulo State University (UNESP), Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, CEP, Araraquara, São Paulo 14800-900 Brazil
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