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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] [What about the content of this article? (0)] [Affiliation(s)] [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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