1
|
Maruška A, Mickienė R, Kaškonienė V, Grigiškis S, Stankevičius M, Drevinskas T, Kornyšova O, Donati E, Tiso N, Mikašauskaitė-Tiso J, Zacchini M, Levišauskas D, Ragažinskienė O, Bimbiraitė-Survilienė K, Kanopka A, Dūda G. Searching for Chemical Agents Suppressing Substrate Microbiota in White-Rot Fungi Large-Scale Cultivation. Microorganisms 2024; 12:1242. [PMID: 38930624 PMCID: PMC11206069 DOI: 10.3390/microorganisms12061242] [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: 04/08/2024] [Revised: 06/07/2024] [Accepted: 06/18/2024] [Indexed: 06/28/2024] Open
Abstract
Edible fungi are a valuable resource in the search for sustainable solutions to environmental pollution. Their ability to degrade organic pollutants, extract heavy metals, and restore ecological balance has a huge potential for bioremediation. They are also sustainable food resources. Edible fungi (basidiomycetes or fungi from other divisions) represent an underutilized resource in the field of bioremediation. By maximizing their unique capabilities, it is possible to develop innovative approaches for addressing environmental contamination. The aim of the present study was to find selective chemical agents suppressing the growth of microfungi and bacteria, but not suppressing white-rot fungi, in order to perform large-scale cultivation of white-rot fungi in natural unsterile substrates and use it for different purposes. One application could be the preparation of a matrix composed of wooden sleeper (contaminated with PAHs) and soil for further hazardous waste bioremediation using white-rot fungi. In vitro microbiological methods were applied, such as, firstly, compatibility tests between bacteria and white-rot fungi or microfungi, allowing us to evaluate the interaction between different organisms, and secondly, the addition of chemicals on the surface of a Petri dish with a test strain of microorganisms of white-rot fungi, allowing us to determine the impact of chemicals on the growth of organisms. This study shows that white-rot fungi are not compatible to grow with several rhizobacteria or bacteria isolated from soil and bioremediated waste. Therefore, the impact of several inorganic materials, such as lime (hydrated form), charcoal, dolomite powder, ash, gypsum, phosphogypsum, hydrogen peroxide, potassium permanganate, and sodium hydroxide, was evaluated on the growth of microfungi (sixteen strains), white-rot fungi (three strains), and bacteria (nine strains) in vitro. Charcoal, dolomite powder, gypsum, and phosphogypsum did not suppress the growth either of microfungi or of bacteria in the tested substrate, and even acted as promoters of their growth. The effects of the other agents tested were strain dependent. Potassium permanganate could be used for bacteria and Candida spp. growth suppression, but not for other microfungi. Lime showed promising results by suppressing the growth of microfungi and bacteria, but it also suppressed the growth of white-rot fungi. Hydrogen peroxide showed strong suppression of microfungi, and even had a bactericidal effect on some bacteria, but did not have an impact on white-rot fungi. The study highlights the practical utility of using hydrogen peroxide up to 3% as an effective biota-suppressing chemical agent prior to inoculating white-rot fungi in the large-scale bioremediation of polluted substrates, or in the large-scale cultivation for mushroom production as a foodstuff.
Collapse
Affiliation(s)
- Audrius Maruška
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Rūta Mickienė
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Vilma Kaškonienė
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | | | - Mantas Stankevičius
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Tomas Drevinskas
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Olga Kornyšova
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Enrica Donati
- National Research Council, Area Della Ricerca di Roma 1, Via Salaria Km 29,300, Monterotondo, 00015 Rome, Italy; (E.D.); (M.Z.)
| | - Nicola Tiso
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Jurgita Mikašauskaitė-Tiso
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Massimo Zacchini
- National Research Council, Area Della Ricerca di Roma 1, Via Salaria Km 29,300, Monterotondo, 00015 Rome, Italy; (E.D.); (M.Z.)
| | - Donatas Levišauskas
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
- Process Control Department, Kaunas University of Technology, Studentų St. 50, LT-51368 Kaunas, Lithuania
| | - Ona Ragažinskienė
- Botanical Garden of Vytautas Magnus University, Ž. E. Žilibero 6, LT-46324 Kaunas, Lithuania;
| | - Kristina Bimbiraitė-Survilienė
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Arvydas Kanopka
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| | - Gediminas Dūda
- Instrumental Analysis Open Access Centre, Vytautas Magnus University, Vileikos St. 8, LT-40444 Kaunas, Lithuania; (R.M.); (V.K.); (M.S.); (T.D.); (O.K.); (N.T.); (J.M.-T.); (D.L.); (K.B.-S.); (A.K.); (G.D.)
| |
Collapse
|
2
|
Ouyang P, Yang J, Zhong Q, Yuan Y, Gao Y, Wang H, Yang ST. Toxicity of VO 2 micro/nanoparticles to nitrogen-fixing bacterium Azotobacter vinelandii. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133553. [PMID: 38266589 DOI: 10.1016/j.jhazmat.2024.133553] [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: 08/25/2023] [Revised: 01/06/2024] [Accepted: 01/16/2024] [Indexed: 01/26/2024]
Abstract
Vanadium dioxide (VO2) has been used in a variety of products due to its outstanding phase transition properties. However, as potential heavy metal contaminants, the environmental hazards and risks of VO2 should be systematically investigated. Biological nitrogen fixation is one of the most dominant processes in biogeochemical cycle, which is associated with nitrogen-fixing bacteria. In this study, we reported the environmental bio-effects of VO2 micro/nanoparticles on the nitrogen-fixing bacterium Azotobacter vinelandii. VO2 at 10 and 30 mg/L caused severe hazards to A. vinelandii, such as cell apoptosis, oxidative damage, physical damage, genotoxicity, and the loss of nitrogen fixation activity. The up-regulated differentially expressed genes of A. vinelandii were related to stress response, and the down-regulated genes were mainly related to energy metabolism. Surprisingly, VO2 of 10 mg/L decreased the nif gene expression but elevated the vnf gene expression, which enhanced the ability of A. vinelandii to reduce acetylene in anaerobic environment. In addition, under tested conditions, VO2 nanoparticles exhibited insignificantly higher toxicity than VO2 microparticles.
Collapse
Affiliation(s)
- Peng Ouyang
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China; College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Jinwei Yang
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Qinmei Zhong
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Yue Yuan
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China
| | - Yanfeng Gao
- School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
| | - Haifang Wang
- Institute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China.
| | - Sheng-Tao Yang
- Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission, Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China.
| |
Collapse
|
3
|
de Souza F, Gupta RK. Bacteria for Bioplastics: Progress, Applications, and Challenges. ACS OMEGA 2024; 9:8666-8686. [PMID: 38434856 PMCID: PMC10905720 DOI: 10.1021/acsomega.3c07372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 01/17/2024] [Accepted: 01/24/2024] [Indexed: 03/05/2024]
Abstract
Bioplastics are one of the answers that can point society toward a sustainable future. Under this premise, the synthesis of polymers with competitive properties using low-cost starting materials is a highly desired factor in the industry. Also, tackling environmental issues such as nonbiodegradable waste generation, high carbon footprint, and consumption of nonrenewable resources are some of the current concerns worldwide. The scientific community has been placing efforts into the biosynthesis of polymers using bacteria and other microbes. These microorganisms can be convenient reactors to consume food and agricultural wastes and convert them into biopolymers with inherently attractive properties such as biodegradability, biocompatibility, and appreciable mechanical and chemical properties. Such biopolymers can be applied to several fields such as packing, cosmetics, pharmaceutical, medical, biomedical, and agricultural. Thus, intending to elucidate the science of microbes to produce polymers, this review starts with a brief introduction to bioplastics by describing their importance and the methods for their production. The second section dives into the importance of bacteria regarding the biochemical routes for the synthesis of polymers along with their advantages and disadvantages. The third section covers some of the main parameters that influence biopolymers' production. Some of the main applications of biopolymers along with a comparison between the polymers obtained from microorganisms and the petrochemical-based ones are presented. Finally, some discussion about the future aspects and main challenges in this field is provided to elucidate the main issues that should be tackled for the wide application of microorganisms for the preparation of bioplastics.
Collapse
Affiliation(s)
- Felipe
Martins de Souza
- National
Institute for Materials Advancement, Pittsburgh
State University, 1204 Research Road, Pittsburgh, Kansas 66762, United States
| | - Ram K. Gupta
- National
Institute for Materials Advancement, Pittsburgh
State University, 1204 Research Road, Pittsburgh, Kansas 66762, United States
- Department
of Chemistry, Pittsburgh State University, 1701 South Broadway Street, Pittsburgh, Kansas 66762, United States
| |
Collapse
|
4
|
Dusso D, Salomon CJ. Solving the delivery of Lactococcus lactis: Improved survival and storage stability through the bioencapsulation with different carriers. J Food Sci 2023; 88:1495-1505. [PMID: 36939001 DOI: 10.1111/1750-3841.16538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/21/2023] [Accepted: 02/27/2023] [Indexed: 03/21/2023]
Abstract
Probiotics are live microorganisms that confer beneficial effects on the health of the host if administered in adequate amounts (106 CFU viable microorganisms/g of food). As the most frequent route of administration of these microorganisms is oral, the number of them that remains viable through the gastrointestinal tract decreases substantially. Thus, in this research work, we developed a series of alginate-based microparticles using different adjuvants such as methylcellulose, carboxymethylcellulose, chitosan, carbopol, β-cyclodextrin, starch, carrageenan, and Eudragit® RS 100 as carriers for improving the survival of Lactococcus lactis. The alginate-based formulations exhibited very good drug encapsulation efficiency, up to 90%. Release studies from selected microparticles revealed that almost 100% of bacteria were in solution at 30 min. By scanning electron microscopy, irregular nonporous particles with a size between 200 and 500 µm were seen. In particular, microparticles formulated with alginate-carboxymethylcellulose and alginate-methylcellulose exhibited the best protection for the bacterial cells against both simulated gastric juice and simulated intestinal juice. In addition, those microparticulate systems were able to maintain the viability of the encapsulated bacteria in large numbers for at least 24 weeks. Thus, the present study confirmed that these alginate-based microparticles are a valuable approach for keeping the viability and storage stability of L. lactis.
Collapse
Affiliation(s)
- Diego Dusso
- Pharmacy Department, Faculty of Pharmaceutical and Biochemical Sciences, National University of Rosario, Rosario, Argentina
| | - Claudio J Salomon
- Pharmacy Department, Faculty of Pharmaceutical and Biochemical Sciences, National University of Rosario, Rosario, Argentina.,Institute of Chemistry, IQUIR-CONICET, National Council Research, Rosario, Argentina
| |
Collapse
|
5
|
Urtuvia V, Ponce B, Andler R, Peña C, Diaz-Barrera A. Extended batch cultures for poly(3-hydroxybutyrate- co-3-hydroxyvalerate) (PHBV) production by Azotobacter vinelandii OP growing at different aeration rates. 3 Biotech 2022; 12:304. [PMID: 36276477 PMCID: PMC9525563 DOI: 10.1007/s13205-022-03380-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Accepted: 09/23/2022] [Indexed: 11/29/2022] Open
Abstract
Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a polymer produced by Azotobacter vinelandii OP. In the bioreactor, PHBV production and its molar composition are affected by aeration rate. PHBV production by A. vinelandii OP was evaluated using extended batch cultures at different aeration rates, which determined different oxygen transfer rates (OTR) in the cultures. Under the conditions evaluated, PHBV with different 3-hydroxyvalerate (3HV) fractions were obtained. In the cultures with a low OTR (6.7 mmol L-1 h-1, at 0.3 vvm), a PHBV content of 38% w w-1 with 9.1 mol % 3HV was achieved. The maximum PHBV production (72% w w-1) was obtained at a high OTR (18.2 mmol L-1 h-1, at 1.0 vvm), both at 48 h. Thus, PHBV production increased in the bioreactor with an increased aeration rate, but not the 3HV fraction in the polymer chain. An OTR of 24.9 mmol L-1 h-1 (at 2.1 vvm) was the most suitable for improving the PHBV content (61% w w-1) and a high 3HV fraction of 20.8 mol % (at 48 h); and volumetric productivity (0.15 g L-1 h-1). The findings indicate that the extended batch culture at 2.1 vvm is the most adequate mode of cultivation to produce higher biomass and PHBV with a high 3HV fraction. Overall, the results have shown that the PHBV production and 3HV fraction could be affected by the aeration rate and the proposed approach could be applied to implement cultivation strategies to optimize PHBV production for different biotechnological applications.
Collapse
Affiliation(s)
- Viviana Urtuvia
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147 Casilla 4059, Valparaíso, Chile
| | - Belén Ponce
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147 Casilla 4059, Valparaíso, Chile
| | - Rodrigo Andler
- Escuela de Ingeniería en Biotecnología, Centro de Biotecnología de los Recursos Naturales (Cenbio),Universidad Católica del Maule, Talca, Chile
| | - Carlos Peña
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México
| | - Alvaro Diaz-Barrera
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147 Casilla 4059, Valparaíso, Chile
| |
Collapse
|
6
|
Alkhatib H, Doolaanea AA, Assadpour E, Mohmad Sabere AS, Mohamed F, Jafari SM. Optimizing the encapsulation of black seed oil into alginate beads by ionic gelation. J FOOD ENG 2022. [DOI: 10.1016/j.jfoodeng.2022.111065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
7
|
Takimoto R, Tatemichi Y, Aoki W, Kosaka Y, Minakuchi H, Ueda M, Kuroda K. A critical role of an oxygen-responsive gene for aerobic nitrogenase activity in Azotobacter vinelandii and its application to Escherichia coli. Sci Rep 2022; 12:4182. [PMID: 35264690 PMCID: PMC8907163 DOI: 10.1038/s41598-022-08007-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/28/2022] [Indexed: 12/02/2022] Open
Abstract
Since nitrogenase is irreversibly inactivated within a few minutes after exposure to oxygen, current studies on the heterologous expression of nitrogenase are limited to anaerobic conditions. This study comprehensively identified genes showing oxygen-concentration-dependent expression only under nitrogen-fixing conditions in Azotobacter vinelandii, an aerobic diazotroph. Among the identified genes, nafU, with an unknown function, was greatly upregulated under aerobic nitrogen-fixing conditions. Through replacement and overexpressing experiments, we suggested that nafU is involved in the maintenance of nitrogenase activity under aerobic nitrogenase activity. Furthermore, heterologous expression of nafU in nitrogenase-producing Escherichia coli increased nitrogenase activity under aerobic conditions by 9.7 times. Further analysis of NafU protein strongly suggested its localization in the inner membrane and raised the possibility that this protein may lower the oxygen concentration inside the cells. These findings provide new insights into the mechanisms for maintaining stable nitrogenase activity under aerobic conditions in A. vinelandii and provide a platform to advance the use of nitrogenase under aerobic conditions.
Collapse
Affiliation(s)
- Ren Takimoto
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yuki Tatemichi
- Research and Development Division, Kikkoman Corporation, 338 Noda, Noda, Chiba, 278-0037, Japan
| | - Wataru Aoki
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Yuishin Kosaka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | | | - Mitsuyoshi Ueda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Kouichi Kuroda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan.
| |
Collapse
|
8
|
Conde-Avila V, Peña C, Pérez-Armendáriz B, Loera O, Martínez Valenzuela C, Leyva Morales JB, Jesús Bastidas Bastidas PD, Salgado-Lugo H, Ortega Martínez LD. Growth, respiratory activity and chlorpyrifos biodegradation in cultures of Azotobacter vinelandii ATCC 12837. AMB Express 2021; 11:177. [PMID: 34958440 PMCID: PMC8712287 DOI: 10.1186/s13568-021-01339-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 12/15/2021] [Indexed: 11/24/2022] Open
Abstract
This study aimed to evaluate the growth, respiratory activity, and biodegradation of chlorpyrifos in cultures of Azotobacter vinelandii ATCC 12837. A strategy based on the modification of culture media and aeration conditions was carried out to increase the cell concentration of A. vinelandii, in order to favor and determine its tolerance to chlorpyrifos and its degradation ability. The culture in shaken flasks, using sucrose as a carbon source, significantly improved the growth compared to media with mannitol. When the strain was cultivated under oxygen-limited (5.5, 11.25 mmol L−1 h−1) and no-oxygen-limited conditions (22 mmol L−1 h−1), the growth parameters were not affected. In cultures in a liquid medium with chlorpyrifos, the bacteria tolerated a high pesticide concentration (500 ppm) and the growth parameters were improved even under conditions with a reduced carbon source (sucrose 2 g L−1). The strain degraded 99.6% of chlorpyrifos at 60 h of cultivation, in co-metabolism with sucrose; notably, A. vinelandii ATCC 12837 reduced by 50% the initial pesticide concentration in only 6 h (DT50). ![]()
Collapse
|
9
|
Ponce B, Urtuvia V, Maturana N, Peña C, Díaz-Barrera A. Increases in alginate production and transcription levels of alginate lyase (alyA1) by control of the oxygen transfer rate in Azotobacter vinelandii cultures under diazotrophic conditions. ELECTRON J BIOTECHN 2021. [DOI: 10.1016/j.ejbt.2021.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
|
10
|
Díaz-Barrera A, Sanchez-Rosales F, Padilla-Córdova C, Andler R, Peña C. Molecular weight and guluronic/mannuronic ratio of alginate produced by Azotobacter vinelandii at two bioreactor scales under diazotrophic conditions. Bioprocess Biosyst Eng 2021; 44:1275-1287. [PMID: 33635396 DOI: 10.1007/s00449-021-02532-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 02/07/2021] [Indexed: 11/24/2022]
Abstract
Alginates can be used to elaborate hydrogels, and their properties depend on the molecular weight (MW) and the guluronic (G) and mannuronic (M) composition. In this study, the MW and G/M ratio were evaluated in cultures of Azotobacter vinelandii to 3 and 30 L scales at different oxygen transfer rates (OTRs) under diazotrophic conditions. An increase in the maximum OTR (OTRmax) improved the alginate production, reaching 3.3 ± 0.2 g L-1. In the cultures conducted to an OTR of 10.4 mmol L-1 h-1 (500 rpm), the G/M increased during the cell growth phase and decreased during the stationary phase; whereas, in the cultures at 19.2 mmol L-1 h-1 was constant throughout the cultivation. A higher alginate MW (520 ± 43 kDa) and G/M ratio (0.86 ± 0.01) were obtained in the cultures conducted at 10.4 mmol L-1 h-1. The OTR as a criterion to scale up alginate production allowed to replicate the concentration and the alginate production rate; however, it was not possible reproduce the MW and G/M ratio. Under a similar specific oxygen uptake rate (qO2) (approximately 65 mmol g-1 h-1) the alginate MW was similar (approximately 365 kDa) in both scales. The evidences revealed that the qO2 can be a parameter adequate to produce alginate MW similar in two bioreactor scales. Overall, the results have shown that the alginate composition could be affected by cellular respiration, and from a technological perspective the evidences contribute to the design process based on oxygen consumption to produce alginates defined.
Collapse
Affiliation(s)
- Alvaro Díaz-Barrera
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147, 4059, Casilla, Valparaíso, Chile.
| | - Francisco Sanchez-Rosales
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147, 4059, Casilla, Valparaíso, Chile.,Facultad de Ciencias Tecnológicas, Universidad Nacional de Agricultura, Carretera a Dulce Nombre de Culmí, km 212, Barrio El Espino, Catacamas, Honduras
| | - Claudio Padilla-Córdova
- Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso, Av. Brasil 2147, 4059, Casilla, Valparaíso, Chile
| | - Rodrigo Andler
- Escuela de Ingeniería en Biotecnología, Universidad Católica del Maule, Talca, Chile
| | - Carlos Peña
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, Mexico
| |
Collapse
|