31 results on '"Alves, Joana I."'
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2. Metabolic versatility of anaerobic sludge towards platform chemical production from waste glycerol
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Magalhães, Carla P., Alves, Joana I., Duber, Anna, Oleskowicz-Popiel, Piotr, Stams, Alfons J. M., and Cavaleiro, Ana J.
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- 2024
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3. Hydrolysates containing xylooligosaccharides produced by different strategies: Structural characterization, antioxidant and prebiotic activities
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Victoria Gautério, Gabrielle, Amorim, Cláudia, Silvério, Sara C., Cardoso, Beatriz B., Ballesteros, Lina F., Alves, Joana I., Alcina Pereira, Maria, Silva, Soraia P., Coelho, Elisabete, Coimbra, Manuel A., Juliano Kalil, Susana, and Rodrigues, Lígia R.
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- 2022
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4. Bioelectrochemical systems (BESs) towards conversion of carbon monoxide/syngas: A mini-review
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Barbosa, Sónia G., Peixoto, Luciana, Alves, Joana I., and Alves, M. Madalena
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- 2021
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5. Epilactose as a Promising Butyrate-Promoter Prebiotic via Microbiota Modulation.
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Cardoso, Beatriz B., Amorim, Cláudia, Franco-Duarte, Ricardo, Alves, Joana I., Barbosa, Sónia G., Silvério, Sara C., and Rodrigues, Lígia R.
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BUTYRATES ,SHORT-chain fatty acids ,VEGANISM ,MEDITERRANEAN diet ,LACTULOSE ,RAFFINOSE - Abstract
Epilactose is a disaccharide composed of galactose and mannose, and it is currently considered an "under development" prebiotic. In this study, we described the prebiotic potential of epilactose by in vitro fermentation using human fecal inocula from individuals following a Mediterranean diet (DM) or a Vegan diet (DV). The prebiotic effect of epilactose was also compared with lactulose and raffinose, and interesting correlations were established between metabolites and microbiota modulation. The production of several metabolites (lactate, short-chain fatty acids, and gases) confirmed the prebiotic properties of epilactose. For both donors, the microbiota analysis showed that epilactose significantly stimulated the butyrate-producing bacteria, suggesting that its prebiotic effect could be independent of the donor diet. Butyrate is one of the current golden metabolites due to its benefits for the gut and systemic health. In the presence of epilactose, the production of butyrate was 70- and 63-fold higher for the DM donor, when compared to lactulose and raffinose, respectively. For the DV donor, an increase of 29- and 89-fold in the butyrate production was obtained when compared to lactulose and raffinose, respectively. In conclusion, this study suggests that epilactose holds potential functional properties for human health, especially towards the modulation of butyrate-producing strains. [ABSTRACT FROM AUTHOR]
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- 2024
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6. In vitro assessment of prebiotic properties of xylooligosaccharides produced by Bacillus subtilis 3610
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Amorim, Cláudia, Silvério, Sara C., Cardoso, Beatriz B., Alves, Joana I., Pereira, Maria Alcina, and Rodrigues, Lígia R.
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- 2020
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7. One-step production of a novel prebiotic mixture using Zymomonas mobilis ZM4
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Braga, Adelaide Correia, Gomes, Daniela Ferreira Castro, Amorim, Cláudia Catarina Oliveira, Silvério, Sara Isabel Cruz, Alves, Joana I., Rainha, João, Cardoso, Beatriz B., Rodrigues, Joana Lúcia Lima Correia, Rodrigues, L. R., and Universidade do Minho
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Science & Technology ,In vitro fermentation ,Zymomonas mobilis ,Human fecal inocula ,Prebiotic ,Fructooligosaccharides (FOS) - Abstract
"Available online 29 April 2022", Zymomonas mobilis ZM4 presents interesting features for the biotechnological production of prebiotics. In this work, a Box-Behnken design approach was used to optimize the medium composition and maximize the fructooligosaccharides (FOS) production, in a one-step process. Afterwards, the scale-up to bioreactor allowed a high yield, titer and productivity of FOS (0.52 ± 0.05 gFOS gSuc-1, 156.50 ± 0.58gL-1, 4.89 ± 0.88gL-1 h-1). Furthermore, after 72h, 86.69 ± 3.70gL-1 of ethanol, 8.0 ± 0.9gL-1 of levan and 45.62 ± 2.70gL-1 of sorbitol were also produced. After purification (purity degree of 80.9%), an in vitro model using human fecal inoculum was used to assess the prebiotic potential of the FOS-enriched mixture. Herein we describe for the first time a one-step approach to produce a prebiotic mixture with market potential as a functional food ingredient using Z. mobilis ZM4., The study received financial support from Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UIDB/04469/2020 unit and the project FoSynBio (POCI-01-0145-FEDER-029549)., info:eu-repo/semantics/publishedVersion
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- 2022
8. ICBM-4 - 4th International Conference on Biogas Microbiology (Book of Abstracts)
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Alves, M. M., Carballa, Marta, Pereira, M. A., Cavaleiro, A. J., Alves, Joana I., Salvador, Andreia Filipa Ferreira, and Universidade do Minho
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Biogas microbiology involves microorganisms with diverse physiological traits, establishing interactions and networks in microbial communities. It is therefore a complex and broad topic. Biogas generation occurs in natural and engineered man-made systems. Knowledge on physiology and diversity of these microorganisms is pivotal to better control the biogas generation in those systems impacting both renewable energy production and methane emissions in nature. The 4th International Conference on Biogas Microbiology will bring together scientists from microbiology and engineering domains, linking life and technology to shape the future of biogas. This conference is the 4th of a series of conferences on biogas microbiology (Leipzig, Germany 2011, Uppasala, Sweden 2014, and Wageningen, The Netherlands 2017). In 2022, it takes place in Braga, Portugal, at Altice Forum Braga, in a joint organization of University of Minho and University of Santiago de Compostela. Welcome to Braga!, info:eu-repo/semantics/publishedVersion
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- 2022
9. CH4 production at moderate H2/CO2 pressures insights on the use of anaerobic granular sludge as biocatalyst
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Barbosa, Sónia G., Alves, Joana I., Lopes, Marlene, Arantes, Ana Luísa, Alves, M. M., and Universidade do Minho
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Pressurized bioreactors ,Biological CO2 methanation ,Gaseous waste streams ,SHMA - Abstract
Introduction: The continuous increase in energy consumption and the intensive use of fossil fuels, lead to the emission of greenhouse gases (GHG) and, in particular, to an increase in the concentration of CO2 in the atmosphere. In this context, the improvement in global awareness and the demand for sustainable technologies and products strongly contribute to laid plans to combat climate change. CO2-to-CH4 conversion represents a cutting-edge solution for CO2 capture and use, contributing to the reduction of GHG emission. Catalytic conversion of CO2-to-CH4 have been investigated, however, the high cost associated to the catalysts employed limits their use on a large scale. Biological CO2 methanation can overcome the significant technical and economic challenges of catalytic CO2 methanation. The biological production of CH4 using CO2-rich gases together with H2 is a promising strategy for the production of bioproducts. Hydrogenotrophic methanogens have a crucial role on the direct conversion of CO2+H2 into CH4, hence the importance to study the specific hydrogenotrophic methanogenic activity (SHMA). Methodology: In this work, the effect of initial substrate (H2/CO2) pressure, from 100 to 500 kPa, on the SHMA, on CH4 production rate and on developed microbial communities were evaluated. Two different pressurized bioreactors were studied using anaerobic granular sludge as the biocatalyst and H2/CO2 (80:20, v/v) as sole carbon and energy source. Gaseous compounds were analyzed by GC and archaeal diversity within granular sludge was monitored by 16S r-RNA based techniques. Results: The results showed an increase in the SHMA as well as in the CH4 production rate with the increase of the initial H2/CO2 pressure. This results are very interesting since no inhibitory effects were observed on the microbial activity, demonstrating the resistance of the anaerobic granular sludge. The Illumina results showed that Methanosarcinales, Methanobacteriales and Methanomicrobiales were the three orders that prevailed in the pressurized system, for all the pressures tested. However, hydrogenotrophic methanogens from Methanobacterium and Methanospirillum genera slightly increased their relative abundance, varying from 38% (100 kPa) to 41% (500 kPa) and from 8% (100 kPa) to 12% (500 kPa), respectively. Conclusions: In conclusion, the archaeal community seems to be very stable when submitted to increasing H2/CO2 pressures, highlighting the potential of the anaerobic granular sludge as an efficient microbial platform for the production of added-value compounds from gaseous carbon waste streams., Portuguese Foundation for Science and Technology (FCT): POCI-01-0145-FEDER-031377; strategic funding of UIDB/04469/2020 unit; BioTecNorte operation (NORTE-01-0145-FEDER-000004); FCT doctoral grant PD/BD/128030/2016., info:eu-repo/semantics/publishedVersion
- Published
- 2022
10. Microbial propionate production from carbon monoxide a novel bioprocess
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Moreira, João, Diender, Martijn, Arantes, Ana Luísa, Boeren, Sjef, Stams, Alfons Johannes Maria, Alves, M. M., Alves, Joana I., Sousa, Diana Z., and Universidade do Minho
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Acetogens ,Propionate ,Carbon monoxide - Abstract
Introduction: The fermentation of CO-rich gases by carboxidotrophic microbes is a promising way to produce valuable organic compounds. Propionate is a value-added compound with numerous industrial applications, e.g. as an antifungal agent in food and feed, and as a building block to produce plastics and herbicides. Propionate is currently produced by petrochemical processes, but it can be produced from ethanol and acetate by some propionogenic bacteria. Ethanol and acetate are usually formed by acetogenic bacteria from CO-rich gases. Accordingly, propionate can be indirectly produced from CO-rich gases, representing a new approach on the realm of microbial CO conversion. Methodology: Four distinct synthetic co-cultures were constructed, consisting of: Acetobacterium wieringae (DSM 1911T) and Pelobacter propionicus (DSM 2379T); A. wieringae (DSM 1911T) and Anaerotignum neopropionicum (DSM 3847T); A. wieringae strain JM and P. propionicus (DSM 2379T); A. wieringae strain JM and A. neopropionicum (DSM 3847T). The physiology of CO conversion to propionate was accessed and a proteogenomic analysis was performed in the best performing co-culture to get insight into the involved biochemical pathways and microbial interactions within the synthetic consortium. Results: Propionate was produced by all the co-cultures, with the highest titer (~24 mM) measured in the co-culture composed of A. wieringae strain JM + A. neopropionicum, which also produced isovalerate (~4 mM), butyrate (~1 mM), and isobutyrate (~0.3 mM). In this synthetic consortium, A. wieringae strain JM converts CO to a acetate and ethanol via the Wood-Ljungdahl pathway; acetate can also be converted to ethanol through the action of aldehyde oxidoreductase (AOR); A. neopropionicum converts ethanol to propionate via the acrylate pathway. In addition, proteins related to amino acid metabolism and stress response were highly abundant during co-cultivation, which raises the hypothesis that amino acids are exchanged by the two microorganisms, and this results in isovalerate and isobutyrate production. Conclusions: This synthetic co-culture represents a new bioprocess for the microbial production of propionate from carbon monoxide, that couples the Wood-Ljungdahl and acrylate pathways. Furthermore, this symbiosis engages an interesting perspective on how C1-fixing and C3-producing microorganisms can be used to expand the product scope of gas fermentation., Portuguese Foundation for Science and Technology (FCT): POCI-01-0145-FEDER-031377; strategic funding of UIDB/04469/2020 unit; BioTecNorte operation (NORTE-01-0145-FEDER-000004); FCT doctoral grants PD/BD/128030/2016 and PD/BD/150583/2020. Netherlands Science Foundation (NWO): Project NWO-GK-07; Perspectief Programma P16-10; Gravitation Grant, Project 024.002.002., info:eu-repo/semantics/publishedVersion
- Published
- 2022
11. Beneficial impact of raffinose on human intestinal microbiota
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Amorim, Cláudia Catarina Oliveira, Silvério, Sara Isabel Cruz, Cardoso, B., Alves, Joana I., Pereira, M. A., Rodrigues, L. R., and Universidade do Minho
- Abstract
Until now the prebiotic potential of pure trisaccharide raffinose on human health remains poorly investigated. In particular, studies following the guidelines recently established by the International Scientific Association for Probiotics and Prebiotics are scarce [1]. Raffinose is non-digestible to humans but can be metabolized by colon bacteria [2], therefore being considered a prebiotic candidate. Different approaches for testing the prebiotic potential of new compounds have been described. However, an in vitro model is considered a more suitable first-stage strategy to screen prebiotics candidates [3], contrarily to in vivo studies which are expensive and time-consuming. In this work, an in vitro model using human fecal inocula of two healthy volunteers (D1 and D2) was used to study the prebiotic potential of raffinose and compare it with the well-stablished and commercial prebiotic lactulose. The intestinal microbiota showed preference for raffinose as substrate presenting the highest consumption value at 48 h (96.0 ± 0.9 % D1 and 95.3 ± 0.7 % D2). The fermentation of raffinose decreased the medium pH, the ammonia concentration and the relative amount of Proteobacteria, including Escherichia coli, while increasing the total production of lactate and short chain fatty acids, viz. acetate and propionate, (129.9±2.6 mM D1 and 179.6±0.6 mM D2), CO2 (10.8±0.8 mmol/Lmedium D1 and 5.2±0.3 mmol/Lmedium D2) and the relative amount of Bifidobacterium and Lactobacillus. This study strongly suggests that raffinose holds potential prebiotic properties for human health and, subsequently, potential to be commercialized as functional food ingredient., CA an BBC acknowledge their grants (2020.00293.CEECIND and SFRH/BD/132324/2017) from Portuguese Foundation for Science and Technology (FCT). The study received financial support from FCT under the scope of the strategic funding of UID/BIO/04469/2020 unit; COMPETE 2020 (POCI-01-0145-FEDER-006684), through national funds and where applicable co-financed by the FEDER, within the PT2020 Partnership Agreement; the Projects FoSynBio (POCI-01-0145-FEDER 029549) and NewFood – Food Technologies Valorization (NORTE-324 01-0246-FEDER-000043). The authors also acknowledge BioTecNorte operation (NORTE-01-0145-FEDER-000004) funded by the European Regional Development Fund under the scope of Norte2020 -Programa Operacional Regional do Norte., info:eu-repo/semantics/publishedVersion
- Published
- 2022
12. Expanding the molecular toolkit for the new gas-converting Acetobacterium wieringae strain JM
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Moreira, João Paulo Carvalho, Heap, John, Alves, Joana I., Domingues, Lucília, and Universidade do Minho
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Gas fermentation is a promising way to convert CO-rich gases to chemicals. In this work we aimed to develop an electrotransformation protocol for the promising gas-converting Acetobacterium wieringae strain JM (sJM) [1], to further implement heterologous pathways for the production of new compounds from gas streams. In this matter, Clostridial species are the most genetic manipulated homoacetogens, and within the Acetobacterium genus, only A. woodii has been used. Therefore, there is a strong need and opportunity to expand the molecular toolkit for sJM and other Acetobacterium species. To achieve this, we tested reported electrotransformation procedures for A. woodii, using available molecular tools from Clostridial species, namely the plasmid vectors pMTL82151, pMTL83151, pMTL84151, and pMTL84151 containing the Gram-positive replicons pBP1, pCB102, pCD6, and pIM13 with the thiamphenicol resistance gene (catP). The utilization reported electrotransformation procedures did not result in sJM transformants. Therefore, we developed a new protocol which we report to be applicable to sJM, A. wieringae DSM 1911 and A. woodii DSM 1030. The most important changes for higher expeditiously and reproducibility were the use of fixed cell density of competent cells resulting in electroporation cell-plasmid ratios of 2 to 3 (OD600.mL/g), the use of an electric field strength of 10 kV/cm, and the selection of transformants in serum anaerobic bottles with molten agar of our optimized basal media. All plasmid vectors were transformed, having pMTL83151 yielded the highest transformation efficiency in all tested Acetobacterium strains, reaching efficiencies up to 5.0 × 102, 2.0 × 103, and 5.1 × 103 transformants g-1 DNA for sJM, A. wieringae DSM 1911 and A. woodii DSM 1030, respectively. Key factors affecting the electrotransformation efficiency include cell-wallweakening using D-threonine, pH of wash buffer, field strength of the electric pulse, plasmid amount, and sucrose osmoprotection. The electrotransformation procedure and tools reported here unlock the genetic manipulation of this biotechnologically relevant sJM strain, which will be directed towards the expansion of the product portfolio of gas fermentation, which is currently limited to mainly acetate and ethanol., Portuguese Foundation for Science and Technology (FCT): POCI-01-0145-FEDER-031377; strategic funding of UIDB/04469/2020 unit; BioTecNorte operation (NORTE-01-0145-FEDER-000004); FCT doctoral grant PD/BD/150583/2020., info:eu-repo/semantics/publishedVersion
- Published
- 2022
13. Zymomonas mobilis an emerging microbial cell factory to produce prebiotics
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Braga, Adelaide Correia, Gomes, Daniela Filipa Correia, Costa, João Manuel Rainha, Amorim, Cláudia Catarina Oliveira, Silvério, Sara Isabel Cruz, Alves, Joana I., Cardoso, Beatriz Alexandra Batista, Fernández- Lobato, M., Rodrigues, Joana Lúcia Lima Correia, Rodrigues, L. R., and Universidade do Minho
- Abstract
info:eu-repo/semantics/publishedVersion
- Published
- 2022
14. Prebiotic potential of hydrolysates containing xylooligosaccharides produced by different approaches
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Gautério, Gabrielle V., Amorim, Cláudia Catarina Oliveira, Silvério, Sara Isabel Cruz, Alves, Joana I., Pereira, M. Alcina, Kalil, Susana, Rodrigues, L. R., and Universidade do Minho
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food and beverages ,Oligosaccharides ,Microbial modulation ,Prebiotic effect ,Prebiotic activity - Abstract
Xylooligosaccharides (XOS) are considered emergent prebiotics with potential for several industrial applications. Here, we investigated the prebiotic activity of XOS-containing hydrolysates produced by different processes: direct fermentation of beechwood xylan (BXL) and enzymatic treatment of beechwood (XLH) or rice husk (RHH) xylans. BXL was obtained by fermentation of beechwood xylan (2.5 g/L increased up to 5.0 g/L after 3 h) using a cloned Bacillus subtilis 3610 containing the xylanase gene xyn2. XLH and RHH were obtained by enzymatic hydrolysis (40 °C, 180 rpm, 24 h) of xylans using a crude xylanase extract from Aureobasidium pullulans CCT 1261 as follows: RHH 3% (w/v) rice husk xylan in pH 5.3 and enzyme load of 200 U/gxylan; XLH 6% (w/v) beechwood xylan in pH 6.0 and enzyme load of 260 U/gxylan. The hydrolysates obtained from each strategy were lyophilized and further used as substrates (10 g/L) in anaerobic fermentation (37 °C, 48h) with fecal inoculum (11%, v/v) to evaluate the prebiotic activity. During the in vitro fermentation, liquid and gas samples were taken periodically for further analysis, as biomass samples for DNA extraction and sequencing analysis. The reduction of both the pH and the ammonia concentration together with the production of short-chain fatty acids, lactate (BLX: 80.4±2.2 mM; RHH: 104.7±4.9 mM; XLH 107.9±5.9 mM) and CO2 (BLX: 12.3±0.5 mmol/L; RHH: 18.1±0.3 mmol/L; XLH: 18.8±1.2 mmol/L) suggested the prebiotic potential of the XOS-containing hydrolysates. Additionally, the fermentation of these hydrolysates decreased the relative abundance of Clostridium, Desulfovibrionales, and Methanobacteriaceae and stimulated the growth of Bacteroides, Megamonas funiformis, and Lactobacillus reuteri. Based on these results, we concluded that the non-purified XOS-containing hydrolysates have promising prebiotic activities for further applications in food and cosmetic areas., CAPES (finance code 001); CNPq (grant numbers 423285/2018-1 and 304857/2018-1); FoSynBio (POCI-01-0145-FEDER-029549); LIGNOZYMES (POCI-01-0145-FEDER-029773). Gabrielle Gautério acknowledge the financial support Postgraduate Student Mobility Program (PROPESP/FURG). Beatriz Cardoso and Claudia Amorim acknowledge their grants (SFRH/BD/132324/2017 and 2020.00293.CEECIND) from Foundation for Science and Technology (FCT)., info:eu-repo/semantics/publishedVersion
- Published
- 2021
15. Anaerobic granular sludge as biocatalyst for CH4 production at moderate H2/CO2 pressures
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Barbosa, Sónia G., Alves, Joana I., Lopes, Marlene, Arantes, Ana Luísa, Alves, Maria Madalena, and Universidade do Minho
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Unprecedented environmental concerns related to the intensive use of fossil fuels has led to the use of alternative energy carriers for the production of biofuels/biochemicals. In this context, the development of alternative technologies for carbon capture and utilization has attracting more and more attention. Gas fermentation is a promising strategy for the production of bioproducts through the conversion of carbon-containing gases, contributing at the same time, to the reduction of greenhouses gases emission. Microbial CO2 conversion with renewable H2, for production of alternative fuels, such as CH4, open perspectives to solve different environmental problems. Hydrogenotrophic methanogens have a crucial role on the direct conversion of CO2+H2 into CH4, hence the importance to study the specific hydrogenotrophic methanogenic activity (SHMA). Objectives: In this work, a pressurized bioreactor was operated in batch mode, under increased H2/CO2 pressure from 100kPa to 500 kPa, to investigate its potential effect on SHMA, on CH4 production rate and on microbial communities. Anaerobic granular sludge was used as biocatalyst. A mixture of H2/CO2 (80% H2 and 20% CO2, v/v) was used as sole carbon and energy source. Gaseous compounds were analyzed by gas chromatography, liquid products were analyzed by HPLC and archaeal diversity within granular sludge was monitored by 16S r-RNA based techniques. Results: An increase in the SHMA as well as in the CH4 production rate was observed with the increase of the initial H2/CO2 pressure. This results are very interesting since no inhibitory effects were observed on the microbial activity, demonstrating the resistance of the anaerobic granular sludge for CH4 production at moderate H2/CO2 pressures (up to 500 kPa). The Illumina sequence results showed that Methanosarcinales, Methanobacteriales and Methanomicrobiales were the three orders that prevailed in the pressurized system, for all the different pressures tested. However, hydrogenotrophic methanogens from Methanobacterium and Methanospirillum genera slightly increased their relative abundance, varying from 38% (100 kPa) to 41% (500 kPa) and from 8% (100 kPa) to 12% (500 kPa), respectively. Conclusions/ Impact of the work: In conclusion, the archaeal community seems to be very stable when submitted to increasing H2/CO2 pressures, highlighting the potential of the anaerobic granular sludge as an efficient microbial platform for the production of added-value compounds from gaseous carbon waste streams., info:eu-repo/semantics/publishedVersion
- Published
- 2021
16. Enrichment of anaerobic syngas-converting bacteria from thermophilic bioreactor sludge
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Alves, Joana I., Stams, Alfons J.M., Plugge, Caroline M., Madalena Alves, M., and Sousa, Diana Z.
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- 2013
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17. Effect of sulfate on methanogenic communities that degrade unsaturated and saturated long-chain fatty acids (LCFA)
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Sousa, Diana Z., Alves, Joana I., Alves, M. Madalena, Smidt, Hauke, and Stams, Alfons J. M.
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- 2009
18. Anaerobic granular sludge as a microbial platform for theconversion of gaseous substrates at moderate pressures
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Alves, Joana I., Lopes, Marlene, Arantes, Ana Luísa, Belo, Isabel, Sousa, Diana Zita Machado, Alves, M. M., and Universidade do Minho
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As the end of fossil fuels-era is approaching, new biotechnological alternatives for biofuels and biochemicals production are emerging. Here we focus on the use of gaseous substrates, namely H2/CO2 and CO/H2/CO2 (syngas) as carbon and energy sources for the production of compounds with economical value, such as biomethane and fatty-acids by anaerobic granular sludge at moderate pressures up to 5×105 Pa. It was proven that anaerobic granular sludge can stand increased H2/CO2 pressure maintaining a high rate of methane production. On the other hand, the rise of syngas pressure up to 5×105 Pa led to a reduction on CO and H2 consumption rates and to a shift towards the formation of propionate and butyrate. The increase of initial H2/CO2 or syngas total pressure resulted in a specialization of the microbial communities. Anaerobic granular sludge was a stable and efficient microbial platform for the conversion of gaseous substrates., This work was financially supported by the Portuguese Foundation for Science and Technology (FCT) under the scope of the following programmes: project INNOVsyn (POCI-01-0145-FEDER-031377; PTDC/BTA-BTA/31377/2017), strategic funding of UID/BIO/04469/2013 unit and COMPETE 2020 (POCI-01-0145-FEDER-006684). The authors thank the European Regional Development Fund under the scope of Norte2020 – Programa Operacional Regional do Norte, BioTecNorte operation (NORTE 01- 0145-FEDER-000004). The FCT postdoctoral grants (SFRH/BPD/101034/2014 and SFRH/BPD/104837/2014) attributed to Marlene Lopes and Joana Alves are also gratefully acknowledged., info:eu-repo/semantics/publishedVersion
- Published
- 2019
19. Long-Chain Fatty Acids Degradation by Desulfomonile Species and Proposal of " Candidatus Desulfomonile Palmitatoxidans".
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Alves, Joana I., Salvador, Andreia F., Castro, A. Rita, Zheng, Ying, Nijsse, Bart, Atashgahi, Siavash, Sousa, Diana Z., Stams, Alfons J. M., Alves, M. Madalena, and Cavaleiro, Ana J.
- Subjects
FATTY acids ,BUTYRATES ,CANDIDATUS ,MICROSCOPY ,CELL morphology ,GENETIC code - Abstract
Microbial communities with the ability to convert long-chain fatty acids (LCFA) coupled to sulfate reduction can be important in the removal of these compounds from wastewater. In this work, an enrichment culture, able to oxidize the long-chain fatty acid palmitate (C
16 : 0 ) coupled to sulfate reduction, was obtained from anaerobic granular sludge. Microscopic analysis of this culture, designated HP culture, revealed that it was mainly composed of one morphotype with a typical collar-like cell wall invagination, a distinct morphological feature of the Desulfomonile genus. 16S rRNA gene amplicon and metagenome-assembled genome (MAG) indeed confirmed that the abundant phylotype in HP culture belong to Desulfomonile genus [ ca. 92% 16S rRNA gene sequences closely related to Desulfomonile spp.; and ca. 82% whole genome shotgun (WGS)]. Based on similar cell morphology and average nucleotide identity (ANI) (77%) between the Desulfomonile sp. in HP culture and the type strain Desulfomonile tiedjei strain DCB-1T , we propose a novel species designated as " Candidatus Desulfomonile palmitatoxidans." This bacterium shares 94.3 and 93.6% 16S rRNA gene identity with Desulfomonile limimaris strain DCB-MT and D. tiedjei strain DCB-1T , respectively. Based on sequence abundance of Desulfomonile -morphotype in HP culture, its predominance in the microscopic observations, and presence of several genes coding for enzymes involved in LCFA degradation, the proposed species " Ca. Desulfomonile palmitatoxidans" most probably plays an important role in palmitate degradation in HP culture. Analysis of the growth of HP culture and D. tiedjei strain DCB-1T with short- (butyrate), medium- (caprylate) and long-chain fatty acids (palmitate, stearate, and oleate) showed that both cultures degraded all fatty acids coupled to sulfate reduction, except oleate that was only utilized by HP culture. In the absence of sulfate, neither HP culture, nor D. tiedjei strain DCB-1T degraded palmitate when incubated with Methanobacterium formicicum as a possible methanogenic syntrophic partner. Unlike D. tiedjei strain DCB-1T , " Ca. Desulfomonile palmitatoxidans" lacks reductive dehalogenase genes in its genome, and HP culture was not able to grow by organohalide respiration. An emended description of the genus Desulfomonile is proposed. Our study reveals an unrecognized LCFA degradation feature of the Desulfomonile genus. [ABSTRACT FROM AUTHOR]- Published
- 2020
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20. Editorial: The microbiology of the biogas process.
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Cavaleiro, Ana J., Alves, Joana I., Salvador, Andreia F., Stams, Alfons J. M., Pereira, M. Alcina, and Alves, M. Madalena
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MICROBIOLOGY ,ANAEROBIC digestion ,MICROBIAL diversity ,BIOGAS - Published
- 2023
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21. Effect of Sulfate on Carbon Monoxide Conversion by a Thermophilic Syngas-Fermenting Culture Dominated by a Desulfofundulus Species.
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Alves, Joana I., Visser, Michael, Arantes, Ana L., Nijsse, Bart, Plugge, Caroline M., Alves, M. Madalena, Stams, Alfons J. M., and Sousa, Diana Z.
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CARBON monoxide ,ELECTROPHILES ,SULFATES ,SPECIES ,SULFATE-reducing bacteria - Abstract
A syngas-degrading enrichment culture, culture T-Syn, was dominated by a bacterium closely related to Desulfofundulus australicus strain AB33
T (98% 16S rRNA gene sequence identity). Culture T-Syn could convert high CO concentrations (from pCO ≈ 34 kPa to pCO ≈ 170 kPa), both in the absence and in the presence of sulfate as external electron acceptor. The products formed from CO conversion were H2 and acetate. With sulfate, a lower H2 /acetate ratio was observed in the product profile, but CO conversion rates were similar to those in the absence of sulfate. The ability of D. australicus strain AB33T to use CO was also investigated. D. australicus strain AB33T uses up to 40% CO (pCO ≈ 68 kPa) with sulfate and up to 20% CO (pCO ≈ 34 kPa) without sulfate. Comparison of the metagenome-assembled genome (MAG) of the Desulfofundulus sp. from T-Syn culture with the genome of D. australicus strain AB33T revealed high similarity, with an ANI value of 99% and only 32 unique genes in the genome of the Desulfofundulus sp. T-Syn. So far, only Desulfotomaculum nigrificans strain CO-1-SRB had been described to grow with CO with and without sulfate. This work further shows the carboxydotrophic potential of Desulfofundulus genus for CO conversion, both in sulfate-rich and low-sulfate environments. [ABSTRACT FROM AUTHOR]- Published
- 2020
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22. Enrichment of Anaerobic Syngas-Converting Communities and Isolation of a Novel Carboxydotrophic Acetobacterium wieringae Strain JM.
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Arantes, Ana L., Moreira, João P. C., Diender, Martijn, Parshina, Sofiya N., Stams, Alfons J. M., Alves, M. Madalena, Alves, Joana I., and Sousa, Diana Z.
- Subjects
CARBON monoxide ,MULTIENZYME complexes ,SYNTHESIS gas ,YEAST extract ,CARBON compounds - Abstract
Syngas is a substrate for the anaerobic bioproduction of fuels and valuable chemicals. In this study, anaerobic sludge was used for microbial enrichments with synthetic syngas and acetate as main substrates. The objectives of this study were to identify microbial networks (in enrichment cultures) for the conversion of syngas to added-value products, and to isolate robust, non-fastidious carboxydotrophs. Enrichment cultures produced methane and propionate, this last one an unusual product from syngas fermentation. A bacterium closely related to Acetobacterium wieringae was identified as most prevalent (87% relative abundance) in the enrichments. Methanospirillum sp. and propionate-producing bacteria clustering within the genera Anaerotignum and Pelobacter were also found. Further on, strain JM, was isolated and was found to be 99% identical (16S rRNA gene) to A. wieringae DSM 1911
T . Digital DNA-DNA hybridization (dDDH) value between the genomes of strain JM and A. wieringae was 77.1%, indicating that strain JM is a new strain of A. wieringae. Strain JM can grow on carbon monoxide (100% CO, total pressure 170 kPa) without yeast extract or formate, producing mainly acetate. Remarkably, conversion of CO by strain JM showed shorter lag phase than in cultures of A. wieringae DSM 1911T , and about four times higher amount of CO was consumed in 7 days. Genome analysis suggests that strain JM uses the Wood-Ljungdahl pathway for the conversion of one carbon compounds (CO, formate, CO2 /H2 ). Genes encoding bifurcational enzyme complexes with similarity to the bifurcational formate dehydrogenase (Fdh) of Clostridium autoethanogenum are present, and possibly relate to the higher tolerance to CO of strain JM compared to other Acetobacterium species. A. wieringae DSM 1911T grew on CO in medium containing 1 mM formate. [ABSTRACT FROM AUTHOR]- Published
- 2020
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23. Enrichment of syngas‐converting communities from a multi‐orifice baffled bioreactor.
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Arantes, Ana L., Alves, Joana I., Stams, Alfons J. M., Alves, M. Madalena, and Sousa, Diana Z.
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- *
SYNTHESIS gas , *METHANE fermentation , *ORIFICE plates (Fluid dynamics) , *BIOREACTORS , *CARBON dioxide reduction , *ANAEROBIC sludge digesters - Abstract
Summary: The substitution of natural gas by renewable biomethane is an interesting option to reduce global carbon footprint. Syngas fermentation has potential in this context, as a diverse range of low‐biodegradable materials that can be used. In this study, anaerobic sludge acclimatized to syngas in a multi‐orifice baffled bioreactor (MOBB) was used to start enrichments with CO. The main goals were to identify the key players in CO conversion and evaluate potential interspecies metabolic interactions conferring robustness to the process. Anaerobic sludge incubated with 0.7 × 105 Pa CO produced methane and acetate. When the antibiotics vancomycin and/or erythromycin were added, no methane was produced, indicating that direct methanogenesis from CO did not occur. Acetobacterium and Sporomusa were the predominant bacterial species in CO‐converting enrichments, together with methanogens from the genera Methanobacterium and Methanospirillum. Subsequently, a highly enriched culture mainly composed of a Sporomusa sp. was obtained that could convert up to 1.7 × 105 Pa CO to hydrogen and acetate. These results attest the role of Sporomusa species in the enrichment as primary CO utilizers and show their importance for methane production as conveyers of hydrogen to methanogens present in the culture. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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24. Comparative Analysis of Carbon Monoxide Tolerance among Thermoanaerobacter Species.
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Alves, Joana I., Alves, M. Madalena, Plugge, Caroline M., Stams, Alfons J. M., and Sousa, Diana Z.
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ACETOGENIUM kivui ,CARBON monoxide ,COMPARATIVE studies - Abstract
An anaerobic thermophilic strain (strain PCO) was isolated from a syngas-converting enrichment culture. Syngas components cannot be used by strain PCO, but the new strain is very tolerant to carbon monoxide (pCO = 1.7 × 105 Pa, 100% CO). 16S rRNA gene analysis and DNA-DNA hybridization revealed that strain PCO is a strain of Thermoanaerobacter thermohydrosulfuricus. The physiology of strain PCO and other Thermoanaerobacter species was compared, focusing on their tolerance to carbon monoxide. T. thermohydrosulfuricus, T. brockii subsp. finnii, T. pseudethanolicus, and T. wiegelii were exposed to increased CO concentrations in the headspace, while growth, glucose consumption and product formation were monitored. Remarkably, glucose conversion rates by Thermoanaerobacter species were not affected by CO. All the tested strains fermented glucose to mainly lactate, ethanol, acetate, and hydrogen, but final product concentrations differed. In the presence of CO, ethanol production was generally less affected, but H
2 production decreased with increasing CO partial pressure. This study highlights the CO resistance of Thermoanaerobacter species. [ABSTRACT FROM AUTHOR]- Published
- 2016
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25. Engineered heat treated methanogenic granules: A promising biotechnological approach for extreme thermophilic biohydrogen production
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Abreu, Angela A., Alves, Joana I., Pereira, M. Alcina, Karakashev, Dimitar, Alves, M. Madalena, and Angelidaki, Irini
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- *
HYDROGEN production , *FERMENTATION , *HEAT treatment , *ATOMIC hydrogen , *BIOREACTORS , *THERMOPHILIC bacteria , *HEAT engineering , *BIOTECHNOLOGY - Abstract
Abstract: In the present study, two granular systems were compared in terms of hydrogen production rate, stability and bacterial diversity under extreme thermophilic conditions (70°C). Two EGSB reactors were individually inoculated with heat treated methanogenic granules (HTG) and HTG amended with enrichment culture with high capacity of hydrogen production (engineered heat treated methanogenic granules – EHTG), respectively. The reactor inoculated with EHTG (R EHTG) attained a maximum production rate of 2.7l H2 l−1day−1 in steady state. In comparison, the R HTG containing the HTG granules was very unstable, with low hydrogen productions and only two peaks of hydrogen (0.8 and 1.5l H2 l−1day−1). The presence of active hydrogen producers in the R EHTG system during the reactor start-up resulted in the development of an efficient H2-producing bacterial community. The results showed that “engineered inocula” where known hydrogen producers are co-inoculated with HTG is an efficient way to start up biohydrogen-producing reactors. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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26. Continuous High Rate Anaerobic Treatment of Oleic Acid Based Wastewater is Possible after a Step Feeding Start-Up.
- Author
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CAVALEIRO, ANA J., SALVADOR, ANDREIA F., ALVES, JOANA I., and ALVES, MADALENA
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- 2009
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27. Designing a functional rice muffin formulated with prebiotic oligosaccharides and sugar reduction.
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Amorim, Cláudia, Cardoso, Beatriz B., Silvério, Sara C., Silva, Jessica C., Alves, Joana I., Pereira, Maria Alcina, Moreira, Ramón, and Rodrigues, Lígia R.
- Subjects
MUFFINS ,INULIN ,OLIGOSACCHARIDES ,PREBIOTICS ,SHORT-chain fatty acids ,RICE ,SUGAR - Abstract
Innovation of pastry products towards higher nutritional and commercial value remains a challenge to the growing field of healthy food. In this study, the prebiotic supplementation and sugar reduction were explored in a widely consumed pastry product with a low level of innovation. The prebiotic potential of commercial agave inulin and galacto-oligosaccharides (GOS) was evaluated and compared by an in vitro model using human fecal inocula. Rice muffins containing 100% of sugar or 75% of sugar supplemented with 0.8% GOS were produced and compared with commercial rice muffins regarding their physical and textural properties. GOS fermentation led to the highest production of lactate and short-chain fatty acids, besides the most significant reduction of the final pH value and of the ammonia and methane production. Inulin presented a higher selectivity towards Lactobacillaceae (51 ± 1% of all), while GOS are more efficient to stimulate Bifidobacteriaceae growth (65 ± 7% of all). Both prebiotics were effective in reducing Methanobacteria. The reduction of sugar content modified the air bubbles characteristics (size and population with a greater number of tunnels) present in the muffin crumb, without relevant differences in apparent porosity. Textural results indicated that springiness and resilience of the muffin with low sugar content are acceptable, but hardness and chewiness were increased. The new-formula muffins presented very relevant textural parameters with comparable values to those reported in the literature for the commercial ones, thus anticipating a good consumer acceptance. This study is an important contribution towards more innovative and diversified healthy pastry products. [Display omitted] • The in vitro fermentation of inulin and GOS was evaluated using human fecal inocula. • GOS led to the highest bifidogenic effect and production of SCFA and gases. • Both prebiotics were effective in reducing Methanobacteria and Proteobacteria. • Rice muffins formulated with GOS and sugar reduction were produced. • Sugar reduction did not alter significantly springiness and resilience of the cakes. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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28. Propionate Production from Carbon Monoxide by Synthetic Cocultures of Acetobacterium wieringae and Propionigenic Bacteria.
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Moreira, João P. C., Diender, Martijn, Arantes, Ana L., Boeren, Sjef, Stams, Alfons J. M., Alves, M. Madalena, Alves, Joana I., and Sousa, Diana Z.
- Subjects
- *
CARBON monoxide , *AMINO acid metabolism , *PROPIONATES - Abstract
Gas fermentation is a promising way to convert CO-rich gases to chemicals. We studied the use of synthetic cocultures composed of carboxydotrophic and propionigenic bacteria to convert CO to propionate. So far, isolated carboxydotrophs cannot directly ferment CO to propionate, and therefore, this cocultivation approach was investigated. Four distinct synthetic cocultures were constructed, consisting of Acetobacterium wieringae (DSM 1911T) and Pelobacter propionicus (DSM 2379T), Ac. wieringae (DSM 1911T) and Anaerotignum neopropionicum (DSM 3847T), Ac. wieringae strain JM and P. propionicus (DSM 2379T), and Ac. wieringae strain JM and An. neopropionicum (DSM 3847T). Propionate was produced by all the cocultures, with the highest titer (;24mM) being measured in the coculture composed of Ac. wieringae strain JM and An. neopropionicum, which also produced isovalerate (;4mM), butyrate (;1mM), and isobutyrate (0.3mM). This coculture was further studied using proteogenomics. As expected, enzymes involved in the Wood-Ljungdahl pathway in Ac. wieringae strain JM, which are responsible for the conversion of CO to ethanol and acetate, were detected; the proteome of An. neopropionicum confirmed the conversion of ethanol to propionate via the acrylate pathway. In addition, proteins related to amino acid metabolism and stress response were highly abundant during cocultivation, which raises the hypothesis that amino acids are exchanged by the two microorganisms, accompanied by isovalerate and isobutyrate production. This highlights the importance of explicitly looking at fortuitous microbial interactions during cocultivation to fully understand coculture behavior. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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29. Fermentação de gás de síntese por Clostridium carboxidivorans
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Roque, Lúcia Manuela Antunes, Alves, Joana I., Alves, M. M., and Universidade do Minho
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CO partial pressure ,Pressão parcial de CO ,Butanol ,Temperature ,Biotecnologia Ambiental [Engenharia e Tecnologia] ,Temperatura ,Syngas ,Clostridium carboxidivorans ,Engenharia e Tecnologia::Biotecnologia Ambiental - Abstract
Dissertação de mestrado em Biotecnologia, Global energy demands and environmental concerns are accelerating the development of renewable energy sources and promoting the replacement of conventional manufacturing processes. In this context, low-biodegradable materials assume a huge importance since it serves as the feedstock for these new bio-based processes. Gasification is an alternative technology for biomass and wastes treatment, and originates a carbon-rich gas (called syngas, mainly composed of carbon monoxide (CO), carbon dioxide (CO2) and hydrogen (H2)), which can be further converted into a large spectrum of chemicals and fuels. Syngas fermentation uses microorganisms as biocatalysts to assimilate 1-carbon molecules and produce value-added compounds, such as acetic and n-butyric acids, ethanol, butanol, among others. Butanol has emerged as a high valuable compound for the chemical and energy industries due to its characteristics (higher energy content, lower toxicity, among others). Although it is nowadays produced from petrochemical processes, some acetogens can produce it from syngas fermentation. From the previous, Clostridium carboxidivorans is considered a promising species for industrial application due to its unique capacity of producing higher alcohols (butanol and hexanol) from syngas at specific experimental conditions. The first part of this thesis focused on the physiological characterization of C. carboxidivorans when converting different substrates (glucose, syngas and CO) and the dependence of yeast extract as a co-factor during syngas fermentation. The second part aimed to evaluate different operational strategies to promote alcohol production (specially butanol): cultivation at sub-optimal temperature and testing different CO partial pressures within the syngas mixture. The main results and conclusions from this thesis are: 1) the versatility of C. carboxidivorans, as it grew well in all the conditions tested, showing no inhibition when cultivated at different temperatures (30 and 37 ºC), pressures (100, 170 and 200 kPa), different gaseous substrates and even in the absence of yeast extract; it was also shown that a higher CO concentration was crucial for n-butyric acid synthesis and that yeast extract is important to accelerate growth but do not influence acetic acid titers; 2) regarding the strategies to promote solventogenesis, the use of above-atmospheric pressures showed to be more promising than cultivation at 30 ºC, since higher pressures (170 and 200 kPa) lead to an increase in CO consumption rate and accelerated n-butyric acid synthesis, which suggests the microorganism was following the metabolic pathway that further leads to butanol production., O crescimento económico e as alterações climáticas têm promovido o desenvolvimento das energias renováveis e de novos processos biotecnológicos. Os resíduos (biomassa e resíduos urbanos) constituem a matéria–prima necessária para esta transição. A gaseificação é uma tecnologia utilizada no tratamento de resíduos, cujo produto final é um gás rico em carbono (monóxido de carbono (CO) e dióxido de carbono (CO2)) e hidrogénio (H2), denominado gás de síntese (ou syngas) que pode ser convertido em vários compostos de elevado interesse económico. A fermentação de syngas recorre à capacidade de certos microrganismos para utilizar estes gases e convertê-los em compostos de valor acrescentado, como os ácidos acético e n-butírico, etanol, butanol, entre outros. O butanol, por exemplo, tem elevado valor para a indústria química e para o sector da energia, devido às suas características (elevado conteúdo energético, baixa toxicidade, entre outros). Apesar de ser atualmente produzido por processos petroquímicos, alguns microrganismos têm a capacidade de o produzir a partir da fermentação de syngas. A espécie Clostridium carboxidivorans destaca-se devido à sua capacidade única de produzir álcoois de maior peso molecular (butanol e hexanol) a partir de syngas em condições operacionais específicas. A primeira parte desta tese focou-se na caracterização fisiológica de C. carboxidivorans na conversão de diferentes substratos (glucose, syngas e CO), bem como na dependência do extrato de levedura como co-factor de crescimento, durante a fermentação de syngas. A segunda parte teve como objetivo estudar estratégias operacionais para promover a produção de álcoois (ex. butanol): temperatura e pressão. Os principais resultados e conclusões são: 1) a versatilidade de C. carboxidivorans, dado ter crescido em todas as condições testadas, não mostrando inibição do crescimento quando cultivado a diferentes temperaturas (30 e 37 ºC), pressões (100, 170 e 200 kPa), misturas gasosas e mesmo na ausência de extrato de levedura no meio de cultura; verificou-se também que uma concentração de CO superior na mistura gasosa foi crucial para a síntese de ácido n-butírico e que o extrato de levedura é importante para acelerar o crescimento, mas não influencia a produção de ácido acético; 2) quanto às diferentes estratégias estudadas, a utilização de pressões superiores (> 100 kPa) mostrou ser mais promissora do que alterar a temperatura de fermentação, pois pressões mais elevadas (170 e 200 kPa) levaram a um aumento da taxa de consumo de CO e produção de ácido n-butírico, o que sugere que o microrganismo estaria a seguir a via metabólica que originará butanol.
- Published
- 2021
30. In vitro fermentation of raffinose to unravel its potential as prebiotic ingredient.
- Author
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Amorim, Cláudia, Silvério, Sara C., Cardoso, Beatriz B., Alves, Joana I., Pereira, Maria Alcina, and Rodrigues, Lígia R.
- Abstract
Until now the prebiotic potential of pure trisaccharide raffinose on human health assessed through high-throughput sequencing remains poorly investigated. In this work, an in vitro model using human fecal inocula of two healthy volunteers (D1 and D2) was used to study the prebiotic potential of raffinose and compare it with the well-stablished and commercial prebiotic lactulose. The intestinal microbiota showed preference for raffinose as substrate showing the highest consumption value at 48 h (96.0 ± 0.9% D1 and 95.3 ± 0.7% D2). The fermentation of raffinose decreased the medium pH, the ammonia concentration and the relative amount of Proteobacteria , while increasing the total production of lactate and short chain fatty acids (129.9 ± 2.6 mmol/L D1 and 179.6 ± 0.6 mmol/L D2), CO 2 (10.8 ± 0.8 mmol/L medium D1 and 5.2 ± 0.3 mmol/L medium D2) and the relative amount of Bifidobacterium and Lactobacillus. This study suggests that raffinose holds potential functional properties for human health. Image 1 • The fermentation of raffinose increased lactate, SCFAs and gases production. • Acetate was the main SCFAs accumulated after 48 h of fermentation. • Raffinose addition led to a reduction of the ammonia content and the final pH. • Bifidobacterium and Lactobacillus relative abundance increased with rafffinose. • Raffinose presents potential functional properties for human health. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
31. Genome analyses of the carboxydotrophic sulfate-reducers Desulfotomaculum nigrificans and Desulfotomaculum carboxydivorans and reclassification of Desulfotomaculum caboxydivorans as a later synonym of Desulfotomaculum nigrificans.
- Author
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Visser M, Parshina SN, Alves JI, Sousa DZ, Pereira IA, Muyzer G, Kuever J, Lebedinsky AV, Koehorst JJ, Worm P, Plugge CM, Schaap PJ, Goodwin LA, Lapidus A, Kyrpides NC, Detter JC, Woyke T, Chain P, Davenport KW, Spring S, Rohde M, Klenk HP, and Stams AJ
- Abstract
Desulfotomaculum nigrificans and D. carboxydivorans are moderately thermophilic members of the polyphyletic spore-forming genus Desulfotomaculum in the family Peptococcaceae. They are phylogenetically very closely related and belong to 'subgroup a' of the Desulfotomaculum cluster 1. D. nigrificans and D. carboxydivorans have a similar growth substrate spectrum; they can grow with glucose and fructose as electron donors in the presence of sulfate. Additionally, both species are able to ferment fructose, although fermentation of glucose is only reported for D. carboxydivorans. D. nigrificans is able to grow with 20% carbon monoxide (CO) coupled to sulfate reduction, while D. carboxydivorans can grow at 100% CO with and without sulfate. Hydrogen is produced during growth with CO by D. carboxydivorans. Here we present a summary of the features of D. nigrificans and D. carboxydivorans together with the description of the complete genome sequencing and annotation of both strains. Moreover, we compared the genomes of both strains to reveal their differences. This comparison led us to propose a reclassification of D. carboxydivorans as a later heterotypic synonym of D. nigrificans.
- Published
- 2014
- Full Text
- View/download PDF
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