Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium
Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic...
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| Autor*in: |
Hassemer, Guilherme de Souza [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2023 |
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| Schlagwörter: |
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| Anmerkung: |
© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 |
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| Übergeordnetes Werk: |
Enthalten in: Bioprocess and biosystems engineering - Springer Berlin Heidelberg, 2001, 46(2023), 8 vom: 09. Juni, Seite 1221-1230 |
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| Übergeordnetes Werk: |
volume:46 ; year:2023 ; number:8 ; day:09 ; month:06 ; pages:1221-1230 |
| Links: |
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| DOI / URN: |
10.1007/s00449-023-02889-y |
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| Katalog-ID: |
OLC2144442045 |
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| 520 | |a Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. | ||
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10.1007/s00449-023-02889-y doi (DE-627)OLC2144442045 (DE-He213)s00449-023-02889-y-p DE-627 ger DE-627 rakwb eng 660 VZ 570 690 540 VZ 12 ssgn Hassemer, Guilherme de Souza verfasserin (orcid)0000-0003-1069-2322 aut Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. Oxidation reduction potential P(3HB) Agroindustry byproducts do Nascimento, Lucas Henrique (orcid)0000-0002-5223-2896 aut Lin, Yen-Han (orcid)0000-0003-3209-9335 aut Steffens, Clarice (orcid)0000-0003-4394-125X aut Junges, Alexander (orcid)0000-0001-7666-264X aut Valduga, Eunice (orcid)0000-0002-2553-0740 aut Enthalten in Bioprocess and biosystems engineering Springer Berlin Heidelberg, 2001 46(2023), 8 vom: 09. Juni, Seite 1221-1230 (DE-627)333469763 (DE-600)2056063-1 (DE-576)094533709 1615-7591 nnns volume:46 year:2023 number:8 day:09 month:06 pages:1221-1230 https://doi.org/10.1007/s00449-023-02889-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_24 GBV_ILN_31 GBV_ILN_2018 GBV_ILN_4277 AR 46 2023 8 09 06 1221-1230 |
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10.1007/s00449-023-02889-y doi (DE-627)OLC2144442045 (DE-He213)s00449-023-02889-y-p DE-627 ger DE-627 rakwb eng 660 VZ 570 690 540 VZ 12 ssgn Hassemer, Guilherme de Souza verfasserin (orcid)0000-0003-1069-2322 aut Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. Oxidation reduction potential P(3HB) Agroindustry byproducts do Nascimento, Lucas Henrique (orcid)0000-0002-5223-2896 aut Lin, Yen-Han (orcid)0000-0003-3209-9335 aut Steffens, Clarice (orcid)0000-0003-4394-125X aut Junges, Alexander (orcid)0000-0001-7666-264X aut Valduga, Eunice (orcid)0000-0002-2553-0740 aut Enthalten in Bioprocess and biosystems engineering Springer Berlin Heidelberg, 2001 46(2023), 8 vom: 09. Juni, Seite 1221-1230 (DE-627)333469763 (DE-600)2056063-1 (DE-576)094533709 1615-7591 nnns volume:46 year:2023 number:8 day:09 month:06 pages:1221-1230 https://doi.org/10.1007/s00449-023-02889-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_24 GBV_ILN_31 GBV_ILN_2018 GBV_ILN_4277 AR 46 2023 8 09 06 1221-1230 |
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10.1007/s00449-023-02889-y doi (DE-627)OLC2144442045 (DE-He213)s00449-023-02889-y-p DE-627 ger DE-627 rakwb eng 660 VZ 570 690 540 VZ 12 ssgn Hassemer, Guilherme de Souza verfasserin (orcid)0000-0003-1069-2322 aut Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. Oxidation reduction potential P(3HB) Agroindustry byproducts do Nascimento, Lucas Henrique (orcid)0000-0002-5223-2896 aut Lin, Yen-Han (orcid)0000-0003-3209-9335 aut Steffens, Clarice (orcid)0000-0003-4394-125X aut Junges, Alexander (orcid)0000-0001-7666-264X aut Valduga, Eunice (orcid)0000-0002-2553-0740 aut Enthalten in Bioprocess and biosystems engineering Springer Berlin Heidelberg, 2001 46(2023), 8 vom: 09. Juni, Seite 1221-1230 (DE-627)333469763 (DE-600)2056063-1 (DE-576)094533709 1615-7591 nnns volume:46 year:2023 number:8 day:09 month:06 pages:1221-1230 https://doi.org/10.1007/s00449-023-02889-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_24 GBV_ILN_31 GBV_ILN_2018 GBV_ILN_4277 AR 46 2023 8 09 06 1221-1230 |
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10.1007/s00449-023-02889-y doi (DE-627)OLC2144442045 (DE-He213)s00449-023-02889-y-p DE-627 ger DE-627 rakwb eng 660 VZ 570 690 540 VZ 12 ssgn Hassemer, Guilherme de Souza verfasserin (orcid)0000-0003-1069-2322 aut Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. Oxidation reduction potential P(3HB) Agroindustry byproducts do Nascimento, Lucas Henrique (orcid)0000-0002-5223-2896 aut Lin, Yen-Han (orcid)0000-0003-3209-9335 aut Steffens, Clarice (orcid)0000-0003-4394-125X aut Junges, Alexander (orcid)0000-0001-7666-264X aut Valduga, Eunice (orcid)0000-0002-2553-0740 aut Enthalten in Bioprocess and biosystems engineering Springer Berlin Heidelberg, 2001 46(2023), 8 vom: 09. Juni, Seite 1221-1230 (DE-627)333469763 (DE-600)2056063-1 (DE-576)094533709 1615-7591 nnns volume:46 year:2023 number:8 day:09 month:06 pages:1221-1230 https://doi.org/10.1007/s00449-023-02889-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_24 GBV_ILN_31 GBV_ILN_2018 GBV_ILN_4277 AR 46 2023 8 09 06 1221-1230 |
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10.1007/s00449-023-02889-y doi (DE-627)OLC2144442045 (DE-He213)s00449-023-02889-y-p DE-627 ger DE-627 rakwb eng 660 VZ 570 690 540 VZ 12 ssgn Hassemer, Guilherme de Souza verfasserin (orcid)0000-0003-1069-2322 aut Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. Oxidation reduction potential P(3HB) Agroindustry byproducts do Nascimento, Lucas Henrique (orcid)0000-0002-5223-2896 aut Lin, Yen-Han (orcid)0000-0003-3209-9335 aut Steffens, Clarice (orcid)0000-0003-4394-125X aut Junges, Alexander (orcid)0000-0001-7666-264X aut Valduga, Eunice (orcid)0000-0002-2553-0740 aut Enthalten in Bioprocess and biosystems engineering Springer Berlin Heidelberg, 2001 46(2023), 8 vom: 09. Juni, Seite 1221-1230 (DE-627)333469763 (DE-600)2056063-1 (DE-576)094533709 1615-7591 nnns volume:46 year:2023 number:8 day:09 month:06 pages:1221-1230 https://doi.org/10.1007/s00449-023-02889-y lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_24 GBV_ILN_31 GBV_ILN_2018 GBV_ILN_4277 AR 46 2023 8 09 06 1221-1230 |
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Influence of redox potential on the accumulation of poly(3-hydroxybutyrate) by Bacillus megaterium |
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Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 |
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Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 |
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Abstract The main goal of the present study was to evaluate the oxidation–reduction potential (ORP) on the production of poly(3-hydroxybutyrate) (P(3HB)) by Bacillus megaterium. Each microorganism has an optimal ORP range, and changes to the culture medium’s ORP may redistribute the cell’s metabolic flux, as such, the measurement and control of the ORP profile allows one to, in a way, manipulate the microbial metabolism, affecting the expression of certain enzymes and allowing for better control over the fermentative process. The ORP tests were carried out in a fermentation vessel coupled with an ORP probe, containing 1 L of mineral medium added with agroindustry byproducts (60% v/v of confectionery wastewater, and 40% v/v of rice parboiling water). The system’s temperature was kept at 30 °C, with an agitation speed of 500 rpm. The vessel’s airflow rate was controlled via a solenoid pump based on the ORP probe’s data. Different ORP values were evaluated to verify their impact on biomass and polymer production. Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. Furthermore, the measurement and control of ORP levels may be an invaluable asset when trying to maximize polymer production under different culture conditions. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023 |
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Cultures using OPR levels of 0 mV displayed the highest amounts of total biomass (5.00 g $ L^{−1} $) when compared to − 20 mV and − 40 mV (2.90 g $ L^{−1} $ and 0.53 g $ L^{−1} $, respectively). Similar results were also found for P(3HB)-to-biomass ratio, with polymer concentration being reduced when using ORP levels below 0 mV and with a maximum amount of polymer-to-biomass ratio of 69.87% after 48 h of culture. Furthermore, it was possible to observe that the culture’s pH can also affect total biomass and polymer concentration, albeit to a lesser extent. Thus, when considering the data found during this study, it is possible to observe that ORP values can greatly impact B. megaterium cell’s metabolism. 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