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Barssoum R, Al Kassis G, Nassereddine R, Saad J, El Ghoul M, Abboud J, Fayad N, Dupoiron S, Cescut J, Aceves-Lara CA, Fillaudeau L, Awad MK. Biochemical limitations of Bacillus thuringiensis based biopesticides production in a wheat bran culture medium. Res Microbiol 2023; 174:104043. [PMID: 36764472 DOI: 10.1016/j.resmic.2023.104043] [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: 10/24/2022] [Revised: 01/30/2023] [Accepted: 01/31/2023] [Indexed: 02/11/2023]
Abstract
Bacillus thuringiensis, a gram-positive sporulating bacteria found in the environment, produces, during its sporulation phase, crystals responsible for its insecticidal activity, constituted of an assembly of pore-forming δ-endotoxins. This has led to its use as a biopesticide, an eco-friendly alternative to harmful chemical pesticides. To minimize production cost, one endemic Bacillus thuringiensis sv. kurstaki (Btk) strain Lip, isolated from Lebanese soil, was cultivated in a wheat bran (WB) based medium (IPM-4-Citrus project EC n° 734921). With the aim of studying the biochemical limitations of Btk biopesticide production in a wheat bran based medium, the WB was sieved into different granulometries, heat treated, inoculated with Btk Lip at flask scale, then filtered and separated into an insoluble and a permeate fractions. Several biochemical analyses, ie. bio performances, starch, elemental composition, total nitrogen and ashes, were then conducted on both fractions before and after culture. On a morphological level, two populations were distinguished, the fine starch granules and the coarse lignocellulosic particles. The biochemical analyses showed that both the raw and sieved WB have a similar proteins content (0.115 g/gdm WB), water content (0.116 g/gdm WB) and elemental composition (carbon: 45%, oxygen: 37%, nitrogen: 3%, hydrogen: 6%, ashes: 5%). The starch content was 17%, 14% and 34% and the fermentable fraction was estimated to 32.1%, 36.1% and 51.1% respectively for classes 2, 3 and 4. Both the elemental composition and Kjeldahl analyses showed that the nitrogen is the limiting nutrient of the culture.
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Affiliation(s)
- Rita Barssoum
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon; Toulouse Biotechnology Institute, Bio & Chemical Engineering, Université de Toulouse- (CNRS UMR5504- INRAE UMR792, INSA), 135 Avenue de Rangueil, 31077 Toulouse, Cedex 04, France.
| | - Gabrielle Al Kassis
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon.
| | - Rayan Nassereddine
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon.
| | - Jihane Saad
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon; Toulouse White Biotechnology (INRAE UMS1337, CNRS UMS3582, INSA), INSA-Toulouse, 135 Avenue de Rangueil 31077, Toulouse Cedex 04, France.
| | - Meriem El Ghoul
- Pharmacological Laboratory Médis, Route de Tunis Km 7-BP 206, Nabeul 8000, Tunisia.
| | - Joanna Abboud
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon; Toulouse White Biotechnology (INRAE UMS1337, CNRS UMS3582, INSA), INSA-Toulouse, 135 Avenue de Rangueil 31077, Toulouse Cedex 04, France.
| | - Nancy Fayad
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon; Multi-Omics Laboratory, School of Pharmacy, Lebanese American University, P.O. Box 36, Byblos 1401, Lebanon.
| | - Stéphanie Dupoiron
- Toulouse White Biotechnology (INRAE UMS1337, CNRS UMS3582, INSA), INSA-Toulouse, 135 Avenue de Rangueil 31077, Toulouse Cedex 04, France.
| | - Julien Cescut
- Toulouse White Biotechnology (INRAE UMS1337, CNRS UMS3582, INSA), INSA-Toulouse, 135 Avenue de Rangueil 31077, Toulouse Cedex 04, France.
| | - César Arturo Aceves-Lara
- Toulouse Biotechnology Institute, Bio & Chemical Engineering, Université de Toulouse- (CNRS UMR5504- INRAE UMR792, INSA), 135 Avenue de Rangueil, 31077 Toulouse, Cedex 04, France.
| | - Luc Fillaudeau
- Toulouse Biotechnology Institute, Bio & Chemical Engineering, Université de Toulouse- (CNRS UMR5504- INRAE UMR792, INSA), 135 Avenue de Rangueil, 31077 Toulouse, Cedex 04, France.
| | - Mireille Kallassy Awad
- Saint-Joseph University of Beirut, UR- EGP, Functional Genomic and Proteomic Laboratory, Faculty of Sciences, Mar Roukos- Dekwaneh, B.P. 17-5208, Mar Mikhael, Beirut, 1104 2020, Lebanon.
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Dynamic Model for Biomass and Proteins Production by Three Bacillus Thuringiensis ssp Kurstaki Strains. Processes (Basel) 2021. [DOI: 10.3390/pr9122147] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bacillus thuringiensis is a microorganism used for the production of biopesticides worldwide. In the present paper, different kinetic models were analyzed to study and compare three different strains of Bt ssp kurstaki (LIP, BLB1, and HD1). Bioperformances (vegetative cell, spore, substrate, and protein) and successive culture phases (oxidative growth, limitation and sporulation, and protein release) were depicted with an overarching aim to estimate total protein productivity, yield, and titer. In the end, two models were calibrated using experimental dataset (11 batches culture in 3 L bioreactor with semisynthetic medium), subsequently validated, and statistically compared. Both models satisfactorily followed the dynamics of the experimental data. Finally, a dynamic model was selected following the Akaike information criterion (AIC).
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Esquivel-Hernández DA, Pennacchio A, Torres-Acosta MA, Parra-Saldívar R, de Souza Vandenberghe LP, Faraco V. Multi-product biorefinery from Arthrospira platensis biomass as feedstock for bioethanol and lactic acid production. Sci Rep 2021; 11:19309. [PMID: 34588465 PMCID: PMC8481326 DOI: 10.1038/s41598-021-97803-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 07/20/2021] [Indexed: 02/08/2023] Open
Abstract
With the aim to reach the maximum recovery of bulk and specialty bioproducts while minimizing waste generation, a multi-product biorefinery for ethanol and lactic acid production from the biomass of cyanobacterium Arthrospira platensis was investigated. Therefore, the residual biomass resulting from different pretreatments consisting of supercritical fluid extraction (SF) and microwave assisted extraction with non-polar (MN) and polar solvents (MP), previously applied on A. platensis to extract bioactive metabolites, was further valorized. In particular, it was used as a substrate for fermentation with Saccharomyces cerevisiae LPB-287 and Lactobacillus acidophilus ATCC 43121 to produce bioethanol (BE) and lactic acid (LA), respectively. The maximum concentrations achieved were 3.02 ± 0.07 g/L of BE by the MN process at 120 rpm 30 °C, and 9.67 ± 0.05 g/L of LA by the SF process at 120 rpm 37 °C. An economic analysis of BE and LA production was carried out to elucidate the impact of fermentation scale, fermenter costs, production titer, fermentation time and cyanobacterial biomass production cost. The results indicated that the critical variables are fermenter scale, equipment cost, and product titer; time process was analyzed but was not critical. As scale increased, costs tended to stabilize, but also more product was generated, which causes production costs per unit of product to sharply decrease. The median value of production cost was US$ 1.27 and US$ 0.39, for BE and LA, respectively, supporting the concept of cyanobacterium biomass being used for fermentation and subsequent extraction to obtain ethanol and lactic acid as end products from A. platensis.
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Affiliation(s)
- Diego A. Esquivel-Hernández
- grid.419886.a0000 0001 2203 4701Escuela de Ingenieria y Ciencias, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, 64849 Monterrey, NL Mexico ,grid.9486.30000 0001 2159 0001Present Address: Departamento de Microbiologia Molecular, Instituto de Biotecnologia, Universidad Nacional Autónoma de México, Ave. Universidad 2001, 62210 Cuernavaca, Morelos Mexico ,grid.9486.30000 0001 2159 0001Present Address: Departamento de Biología Celular, Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior s/n, 04510 Mexico City, Mexico
| | - Anna Pennacchio
- grid.4691.a0000 0001 0790 385XDepartment of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
| | - Mario A. Torres-Acosta
- grid.83440.3b0000000121901201Department of Biochemical Engineering, The Advance Centre for Biochemical Engineering, University College London, London, WC1E 6BT UK
| | - Roberto Parra-Saldívar
- grid.419886.a0000 0001 2203 4701Escuela de Ingenieria y Ciencias, Tecnologico de Monterrey, Campus Monterrey, Ave. Eugenio Garza Sada 2501, 64849 Monterrey, NL Mexico
| | - Luciana Porto de Souza Vandenberghe
- grid.20736.300000 0001 1941 472XDepartment of Bioprocess Engineering and Biotechnology, Federal University of Paraná, Coronel Francisco H. dos Santos Avenue, 210, Curitiba, 81531-980 Brazil
| | - Vincenza Faraco
- grid.4691.a0000 0001 0790 385XDepartment of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte S. Angelo, Via Cintia 4, 80126 Naples, Italy
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Jallouli W, Driss F, Fillaudeau L, Rouis S. Review on biopesticide production by Bacillus thuringiensis subsp. kurstaki since 1990: Focus on bioprocess parameters. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.07.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Benavides-López S, Oviedo-Ramírez J, López-Taborda JD, Martínez-Mira A, Vásquez-Rivera A, Hoyos-Sánchez R, Orozco-Sánchez F. Bioprocess plant design and economic analysis of an environmentally friendly insect controller agent produced with Azadirachta indica cell culture. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kumar LR, Ndao A, Valéro J, Tyagi RD. Production of Bacillus thuringiensis based biopesticide formulation using starch industry wastewater (SIW) as substrate: A techno-economic evaluation. BIORESOURCE TECHNOLOGY 2019; 294:122144. [PMID: 31542498 DOI: 10.1016/j.biortech.2019.122144] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 09/06/2019] [Accepted: 09/07/2019] [Indexed: 06/10/2023]
Abstract
In this study, cost simulation was made to produce Bacillus thuriengiensis based biopesticide formulation using starch industry wastewater (SIW) as substrate. The results obtained at pilot plant (2000L capacity fermenter) were used for cost simulation of the process. The unit production cost for annual production of 5 million L of formulated biopesticide (20.2 Billion International Units (BIU)/L) was estimated to be $ 2.54/L, which is competitive to chemical pesticides. The techno-economic evaluation revealed that the profitability of the biopesticide manufacturing process was sensitive to the plant capacity and selling price of the biopesticide. The manufacturer should target 5 million L annual plant capacity and selling price of $ 15/L for payback period to be less than 5 years. The process serves many advantages (1) alternate disposal or bio-valorisation of industry wastewater and (2) use of industry wastewater as inexpensive carbon source reducing cost of raw materials for fermentation.
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Affiliation(s)
- Lalit R Kumar
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
| | - Adama Ndao
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
| | - Jose Valéro
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada
| | - R D Tyagi
- INRS Eau, Terre et Environnement, 490, rue de la Couronne, Québec G1K 9A9, Canada.
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Ndao A, Kumar LR, Tyagi RD, Valéro J. Biopesticide and formulation processes based on starch industrial wastewater fortified with soybean medium. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2019; 55:115-126. [PMID: 31549910 DOI: 10.1080/03601234.2019.1668225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The aim of this study was to produce Bacillus thuringiensis-based biopesticide using starch-producing industry wastewater (SIW) fortified with soybean medium and optimize the formulated product using different adjuvants. This study was necessary as low endotoxin concentration is obtained in formulated biopesticide when SIW alone is used as fermentation medium. The fermentation runs were conducted using SIW alone and SIW fortified with 25% soybean (w/v) medium in 2000 L and 150 L bioreactor, respectively. SIW supplemented with soybean medium showed an increase in cell count (from 1.95 × 108 to 1.65 × 109 CFU mL-1), spore synthesis (from 1.5 × 108 to 1.35 × 109 CFU mL-1) and endotoxin concentration (from 436 to 1170 μg mL-1) when compared to SIW medium alone. The fermented broth was concentrated using continuous centrifugation and adjuvants were added for biopesticide formulation in order to enhance its resistance against UV rays and rainfastness. Entomotoxicity of the formulation produced using fermented broth of SIW fortified with soybean (38,000 IU μL-1) was higher than that obtained by SIW medium alone (21,000 IU μL-1), commercial biopesticide Foray 76B (20,000 IU μL-1) and Btk sander's (12,500 IU μL-1).
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Affiliation(s)
- Adama Ndao
- INRS-ETE, Université du Québec, Québec, Canada
| | | | | | - Jose Valéro
- INRS-ETE, Université du Québec, Québec, Canada
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't Lam G, Vermuë M, Eppink M, Wijffels R, van den Berg C. Multi-Product Microalgae Biorefineries: From Concept Towards Reality. Trends Biotechnol 2018; 36:216-227. [DOI: 10.1016/j.tibtech.2017.10.011] [Citation(s) in RCA: 102] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 10/12/2017] [Accepted: 10/18/2017] [Indexed: 10/18/2022]
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Mupondwa E, Li X, Boyetchko S, Hynes R, Geissler J. Technoeconomic analysis of large scale production of pre-emergent Pseudomonas fluorescens microbial bioherbicide in Canada. BIORESOURCE TECHNOLOGY 2015; 175:517-28. [PMID: 25459863 DOI: 10.1016/j.biortech.2014.10.130] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2014] [Revised: 10/24/2014] [Accepted: 10/27/2014] [Indexed: 05/22/2023]
Abstract
The study presents an ex ante technoeconomic analysis of commercial production of Pseudomonas fluorescens BRG100 bioherbicide in Canada. An engineering economic model is designed in SuperPro Designer® to investigate capital investment scaling and profitability. Total capital investment for a stand-alone BRG100 fermentation plant at baseline capacity (two 33,000L fermenters; 3602tonnesannum(-1)) is $17.55million. Total annual operating cost is $14.76million. Raw materials account for 50% of operating cost. The fermentation plant is profitable over wide operating scale, evaluated over a range of BRG100 prices and costs of capital. Smaller plants require higher NPV breakeven prices. However, larger plants are more sensitive to changes in the cost of capital. Unit production costs decrease as plant capacity increases, indicating scale economies. A plant operating for less than one year approaches positive NPV for periods as low as 2months. These findings can support bioherbicide R&D investment and commercialization strategies.
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Affiliation(s)
- Edmund Mupondwa
- Bioproducts and Bioprocesses, Science and Technology Branch, Agriculture and Agri-Food Canada, Government of Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK S7N0X2, Canada.
| | - Xue Li
- Bioproducts and Bioprocesses, Science and Technology Branch, Agriculture and Agri-Food Canada, Government of Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK S7N0X2, Canada
| | - Susan Boyetchko
- Bioproducts and Bioprocesses, Science and Technology Branch, Agriculture and Agri-Food Canada, Government of Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK S7N0X2, Canada
| | - Russell Hynes
- Bioproducts and Bioprocesses, Science and Technology Branch, Agriculture and Agri-Food Canada, Government of Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK S7N0X2, Canada
| | - Jon Geissler
- Bioproducts and Bioprocesses, Science and Technology Branch, Agriculture and Agri-Food Canada, Government of Canada, Saskatoon Research Centre, 107 Science Place, Saskatoon, SK S7N0X2, Canada
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Lalloo R, Maharajh D, Görgens J, Gardiner N. A downstream process for production of a viable and stable Bacillus cereus aquaculture biological agent. Appl Microbiol Biotechnol 2010; 86:499-508. [PMID: 19921182 DOI: 10.1007/s00253-009-2294-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2009] [Revised: 09/29/2009] [Accepted: 10/03/2009] [Indexed: 10/20/2022]
Abstract
Biological products offer advantages over chemotherapeutics in aquaculture. Adoption in commercial application is lacking due to limitations in process and product development that address key end user product requirements such as cost, efficacy, shelf life and convenience. In previous studies, we have reported on the efficacy, physiological robustness and low-cost spore production of a Bacillus cereus isolate (NRRL 100132). This study examines the development of suitable spore recovery, drying, formulation and tablet production from the fermentation product. Key criteria used for such downstream process unit evaluation included spore viability, recovery, spore balance, spore re-germination, product intermediate stability, end product stability and efficacy. A process flow sheet comprising vertical tube centrifugation, fluidised bed agglomeration and tablet pressing yielded a suitable product. The formulation included corn steep liquor and glucose to enhance subsequent spore regermination. Viable spore recovery and spore balance closure across each of the process units was high (>70% and >99% respectively), with improvement in recovery possible by adoption of continuous processing at large scale. Spore regermination was 97%, whilst a product half-life in excess of 5 years was estimated based on thermal resistance curves. The process resulted in a commercially attractive product and suitable variable cost of production.
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Systems biology of industrial microorganisms. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2010; 120:51-99. [PMID: 20503029 DOI: 10.1007/10_2009_59] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The field of industrial biotechnology is expanding rapidly as the chemical industry is looking towards more sustainable production of chemicals that can be used as fuels or building blocks for production of solvents and materials. In connection with the development of sustainable bioprocesses, it is a major challenge to design and develop efficient cell factories that can ensure cost efficient conversion of the raw material into the chemical of interest. This is achieved through metabolic engineering, where the metabolism of the cell factory is engineered such that there is an efficient conversion of sugars, the typical raw materials in the fermentation industry, into the desired product. However, engineering of cellular metabolism is often challenging due to the complex regulation that has evolved in connection with adaptation of the different microorganisms to their ecological niches. In order to map these regulatory structures and further de-regulate them, as well as identify ingenious metabolic engineering strategies that full-fill mass balance constraints, tools from systems biology can be applied. This involves both high-throughput analysis tools like transcriptome, proteome and metabolome analysis, as well as the use of mathematical modeling to simulate the phenotypes resulting from the different metabolic engineering strategies. It is in fact expected that systems biology may substantially improve the process of cell factory development, and we therefore propose the term Industrial Systems Biology for how systems biology will enhance the development of industrial biotechnology for sustainable chemical production.
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Chang M, Zhou SG, Lu N, Ni JR. Starch processing wastewater as a new medium for production of Bacillus thuringiensis. World J Microbiol Biotechnol 2007. [DOI: 10.1007/s11274-007-9491-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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13
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Moreira GA, Micheloud GA, Beccaria AJ, Goicoechea HC. Optimization of the Bacillus thuringiensis var. kurstaki HD-1 δ-endotoxins production by using experimental mixture design and artificial neural networks. Biochem Eng J 2007. [DOI: 10.1016/j.bej.2006.12.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Berón CM, Salerno GL. Cloning and characterization of a novel crystal protein from a native Bacillus thuringiensis isolate highly active against Aedes aegypti. Curr Microbiol 2007; 54:271-6. [PMID: 17334846 DOI: 10.1007/s00284-006-0299-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2006] [Accepted: 06/20/2006] [Indexed: 10/23/2022]
Abstract
We characterized a novel Bacillus thuringiensis isolate native to Argentina (FCC 41) that exhibits a mosquitocidal activity higher than the reference B. thuringiensis subsp. israelensis. This isolate shows a rounded crystal harboring two major proteins of about 70-80 kDa. Moreover, we cloned and sequenced the encoding gene of one of the crystal proteins (Cry) consisting of an open reading frame of 2061 pb that encodes a protein of 687 amino acid residues. The deduced amino acid sequence has a predicted relative molecular mass of 78 kDa and is 52% and 45% identical to those of the reported Cry24Aa and Cry24Ba sequences, respectively. The novel Cry protein was designated as Cry24Ca, which also exhibited larvicidal activity against Aedes aegypti when its encoding gene was expressed in an Escherichia coli host strain.
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Affiliation(s)
- Corina M Berón
- Centro de Investigaciones Biológicas, Fundación para Investigaciones Biológicas Aplicadas, C.C. 1348, 7600, Mar del Plata, Argentina
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Nicholson GM. Fighting the global pest problem: preface to the special Toxicon issue on insecticidal toxins and their potential for insect pest control. Toxicon 2006; 49:413-22. [PMID: 17223148 DOI: 10.1016/j.toxicon.2006.11.028] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2006] [Accepted: 11/17/2006] [Indexed: 12/21/2022]
Abstract
Arthropod pests are responsible for major crop devastation and are vectors for the transmission of new and re-emerging diseases in humans and livestock. Despite many years of effective control by conventional agrochemical insecticides, a number of factors are threatening the effectiveness and continued use of these agents. These include the development of insecticide resistance and use-cancellation or de-registration of some insecticides due to human health and environmental concerns. Several approaches are being investigated for the design of new (bio)pesticides. These include the development of transgenic plants and recombinant baculoviruses as delivery systems for a variety of insect-selective toxins. Additional approaches for the development of foliar sprays include the rational design of peptidomimetics based on the key residues of these toxins that interact with the insect target. This special issue provides an overview of these phyletically selective animal, plant and microbial toxins and their diverse mechanisms of action to paralyze or kill arthropods. In addition, it reviews their potential for biopesticide discovery and validation of novel insecticide targets and provides an overview of the strengths and weaknesses of biopesticides in the global control of arthropod pests.
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Affiliation(s)
- Graham M Nicholson
- Neurotoxin Research Group, Department of Medical & Molecular Biosciences, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australia.
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Brar SK, Verma M, Tyagi RD, Valéro JR, Surampalli RY. Efficient centrifugal recovery of Bacillus thuringiensis biopesticides from fermented wastewater and wastewater sludge. WATER RESEARCH 2006; 40:1310-20. [PMID: 16515801 DOI: 10.1016/j.watres.2006.01.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2005] [Revised: 11/27/2005] [Accepted: 01/21/2006] [Indexed: 05/06/2023]
Abstract
Studies were conducted on harvesting of Bacillus thuringiensis (Bt)-based biopesticides from fermented broths of starch industry wastewater (SIW), wastewater sludge (raw and hydrolyzed-NH and TH, respectively) and semi-synthetic soyameal to enhance entomotoxicity (Tx) by centrifugation. Pertinent factors influencing Tx, solids concentration, pH, temperature and centrifugal force were investigated. The centrifugate solids concentration beyond 100 g/l did not enhance Tx, instead caused pellet formation. Centrifugation efficiency (Tx recovery) was higher at pH 4, and temperature 20 degrees C for starch wastewater (98%), wastewater sludge (98% and 97.8% for non-hydrolyzed and hydrolyzed, respectively) and soya broth (83%). For maximum Tx recovery (SIW-95%; NH-90%; TH-98% and soya-78%), the centrifugal force and time required was 48,000 g and 30 min, respectively. Losses in recovery efficiency were lower for SIW and wastewater sludge in comparison to soya on adopting commercially recommended centrifugal force of 9000 g. The settling velocity computations for different fermented broths enabled calculation of Sigma factor for continuous commercial centrifuge of a given capacity and hence simulation of power requirements. It was established that power requirements for a given Tx recovery efficiency were highest for conventional medium (soya) in comparison to other waste-based fermented broths.
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Affiliation(s)
- Satinder K Brar
- INRS-ETE, Université du Québec, 490, Rue de la Couronne, Quebec, Canada G1K 9A9
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