1
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Mahto KU, Das S. Electroactive biofilm communities in microbial fuel cells for the synergistic treatment of wastewater and bioelectricity generation. Crit Rev Biotechnol 2024:1-20. [PMID: 39009474 DOI: 10.1080/07388551.2024.2372070] [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: 09/29/2022] [Accepted: 06/09/2024] [Indexed: 07/17/2024]
Abstract
Increasing industrialization and urbanization have contributed to a significant rise in wastewater discharge and exerted extensive pressure on the existing natural energy resources. Microbial fuel cell (MFC) is a sustainable technology that utilizes wastewater for electricity generation. MFC comprises a bioelectrochemical system employing electroactive biofilms of several aerobic and anaerobic bacteria, such as Geobacter sulfurreducens, Shewanella oneidensis, Pseudomonas aeruginosa, and Ochrobacterum pseudiintermedium. Since the electroactive biofilms constitute a vital part of the MFC, it is crucial to understand the biofilm-mediated pollutant metabolism and electron transfer mechanisms. Engineering electroactive biofilm communities for improved biofilm formation and extracellular polymeric substances (EPS) secretion can positively impact the bioelectrochemical system and improve fuel cell performance. This review article summarizes the role of electroactive bacterial communities in MFC for wastewater treatment and bioelectricity generation. A significant focus has been laid on understanding the composition, structure, and function of electroactive biofilms in MFC. Various electron transport mechanisms, including direct electron transfer (DET), indirect electron transfer (IET), and long-distance electron transfer (LDET), have been discussed. A detailed summary of the optimization of process parameters and genetic engineering strategies for improving the performance of MFC has been provided. Lastly, the applications of MFC for wastewater treatment, bioelectricity generation, and biosensor development have been reviewed.
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Affiliation(s)
- Kumari Uma Mahto
- Laboratory of Environmental Microbiology and Ecology (LEnME), Department of Life Science, National Institute of Technology, Rourkela, Odisha, India
| | - Surajit Das
- Laboratory of Environmental Microbiology and Ecology (LEnME), Department of Life Science, National Institute of Technology, Rourkela, Odisha, India
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2
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Li C, Hu S, Ji C, Yi K, Yang W. Insight into the Pseudocapacitive Behavior of Electroactive Biofilms in Response to Dynamic-Controlled Electron Transfer and Metabolism Kinetics for Current Generation in Water Treatment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:19891-19901. [PMID: 38000046 DOI: 10.1021/acs.est.3c04771] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2023]
Abstract
Electroactive biofilms (EBs) engage in complex electron transfer and storage processes involving intracellular and extracellular mediators with temporary electron storage capabilities. Consequently, electroactive biofilms exhibit pseudocapacitive behaviors during substrate degradation processes. However, comprehensive systematic research in this area has been lacking. This study demonstrated that the pseudocapacitive property was an intrinsic characteristic of EBs. This property represents dynamic-controlled electron transfer and is critical in current generation, unlike noncapacitive responses. Nontransient charge and discharge experiments revealed a correlation between capacitive charge accumulation and current generation in EBs. Additionally, analysis of substrate degradation suggested that the maximum power density (Pmax) changed with the kinetic constants of COD degradation, with pseudocapacitances of EBs directly proportional to Pmax. The interaction networks of key latent variables were evaluated through partial least-squares path modeling analysis. The results indicated that cytochrome c was closely associated with the formation of pseudocapacitance in EBs. In conclusion, pseudocapacitance can be considered a valuable indicator for assessing the complex electron transfer behavior of EBs. Pseudocapacitive biofilms have the potential to efficiently regulate biological reactions and serve as a promising carbon-neutral and renewable strategy for energy generation and storage. An in-depth understanding of the intrinsic property of pseudocapacitive behavior in EBs can undoubtedly advance the development of this concept in the future.
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Affiliation(s)
- Chao Li
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China
| | - Shaogang Hu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China
| | - Chengcheng Ji
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China
| | - Kexin Yi
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China
| | - Wulin Yang
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environmental Sciences and Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, PR China
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3
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Atkinson JT, Chavez MS, Niman CM, El-Naggar MY. Living electronics: A catalogue of engineered living electronic components. Microb Biotechnol 2023; 16:507-533. [PMID: 36519191 PMCID: PMC9948233 DOI: 10.1111/1751-7915.14171] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 09/26/2022] [Accepted: 11/01/2022] [Indexed: 12/23/2022] Open
Abstract
Biology leverages a range of electrical phenomena to extract and store energy, control molecular reactions and enable multicellular communication. Microbes, in particular, have evolved genetically encoded machinery enabling them to utilize the abundant redox-active molecules and minerals available on Earth, which in turn drive global-scale biogeochemical cycles. Recently, the microbial machinery enabling these redox reactions have been leveraged for interfacing cells and biomolecules with electrical circuits for biotechnological applications. Synthetic biology is allowing for the use of these machinery as components of engineered living materials with tuneable electrical properties. Herein, we review the state of such living electronic components including wires, capacitors, transistors, diodes, optoelectronic components, spin filters, sensors, logic processors, bioactuators, information storage media and methods for assembling these components into living electronic circuits.
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Affiliation(s)
- Joshua T Atkinson
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California, USA
| | - Marko S Chavez
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California, USA
| | - Christina M Niman
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California, USA
| | - Mohamed Y El-Naggar
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California, USA.,Department of Biological Sciences, University of Southern California, Los Angeles, California, USA.,Department of Chemistry, University of Southern California, Los Angeles, California, USA
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4
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Grozinger L, Heidrich E, Goñi-Moreno Á. An electrogenetic toggle switch model. Microb Biotechnol 2023; 16:546-559. [PMID: 36207818 PMCID: PMC9948229 DOI: 10.1111/1751-7915.14153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 07/29/2022] [Accepted: 09/10/2022] [Indexed: 11/29/2022] Open
Abstract
Synthetic biology uses molecular biology to implement genetic circuits that perform computations. These circuits can process inputs and deliver outputs according to predefined rules that are encoded, often entirely, into genetic parts. However, the field has recently begun to focus on using mechanisms beyond the realm of genetic parts for engineering biological circuits. We analyse the use of electrogenic processes for circuit design and present a model for a merged genetic and electrogenetic toggle switch operating in a biofilm attached to an electrode. Computational simulations explore conditions under which bistability emerges in order to identify the circuit design principles for best switch performance. The results provide a basis for the rational design and implementation of hybrid devices that can be measured and controlled both genetically and electronically.
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Affiliation(s)
- Lewis Grozinger
- School of Computing, Newcastle University, Newcastle Upon Tyne, UK.,Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA/CSIC), Madrid, Spain
| | - Elizabeth Heidrich
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle Upon Tyne, UK
| | - Ángel Goñi-Moreno
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA/CSIC), Madrid, Spain
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5
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Gao Y, Xia L, Yao P, Lee HS. Periodic step polarization accelerates electron recovery by electroactive biofilms (EABs). Biotechnol Bioeng 2023; 120:1545-1556. [PMID: 36782377 DOI: 10.1002/bit.28352] [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: 10/13/2022] [Revised: 01/08/2023] [Accepted: 02/09/2023] [Indexed: 02/15/2023]
Abstract
Relatively low rate of electron recovery is one of the factors that limit the advancement of bioelectrochemical systems. Here, new periodic polarizations were investigated with electroactive biofilms (EABs) enriched from activated sludge and Geobacter sulfurreducens biofilms. When representative anode potentials (Ea ) were applied, redox centers with midpoint potentials (Emid ) higher than Ea were identified by localized cyclic voltammetry. The electrons held by these redox centers were accessible when Ea was raised to 0.4 V (vs. Ag/AgCl). New periodic polarizations that discharge at 0.4 V recovered electrons faster than normal periodic and fixed-potential polarizations. The best-performing periodic step polarization accelerated electron recovery by 23%-24% and 12%-76% with EABs and G. sulfurreducens biofilms, respectively, compared to the fixed-potential polarization. Quantitative reverse transcription polymerase chain reaction showed an increased abundance of omcZ mRNA transcripts from G. sulfurreducens after periodic step polarization. Therefore, both the rate of energy recovery by EABs and the performance of bioelectrochemical systems can be enhanced by improving the polarization schemes.
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Affiliation(s)
- Yaohuan Gao
- Institute of Global Environmental Change, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Longfei Xia
- Institute of Global Environmental Change, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China.,Shaanxi Provincial Land Engineering Construction Group, Xi'an, Shaanxi, People's Republic of China
| | - Peiru Yao
- Institute of Global Environmental Change, School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China
| | - Hyung-Sool Lee
- Institute for Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), Naju-si, Republic of Korea
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6
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Karoń K, Zabłocka-Godlewska E, Krukiewicz K. Recent advances in the design of bacteria-based supercapacitors: Current limitations and future opportunities. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Matabosch Coromina H, Antonio Cuffaro G, Tommasi T, Puig S, Virdis B. A slurry electrode based on reduced graphene oxide and poly(sodium 4-styrenesulfonate) for applications in microbial electrochemical technologies. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116546] [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]
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8
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GSU1771 regulates extracellular electron transfer and electroactive biofilm formation in Geobacter sulfurreducens: Genetic and electrochemical characterization. Bioelectrochemistry 2022; 145:108101. [PMID: 35334296 DOI: 10.1016/j.bioelechem.2022.108101] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 03/15/2022] [Accepted: 03/16/2022] [Indexed: 11/21/2022]
Abstract
Type IV pili and the >100c-type cytochromes in Geobacter sulfurreducens are essential for extracellular electron transfer (EET) towards metal oxides and electrodes. A previous report about a mutation in the gsu1771 gene indicated an enhanced reduction of insoluble Fe(III) oxides coupled with increased pilA expression. Herein, a marker-free gsu1771-deficient mutant was constructed and characterized to assess the role of this regulator in EET and the formation of electroactive biofilms. Deleting this gene delayed microbial growth in the acetate/fumarate media (electron donor and acceptor, respectively). However, this mutant reduced soluble and insoluble Fe(III) oxides more efficiently. Heme staining, western blot, and RT-qPCR analyses demonstrated that GSU1771 regulates the transcription of several genes (including pilA) and many c-type cytochromes involved in EET, suggesting the broad regulatory role of this protein. DNA-protein binding assays indicated that GSU1771 directly regulates the transcription of pilA, omcE, omcS, and omcZ. Additionally, gsu1771-deficient mutant biofilms are thicker than wild-type strains. Electrochemical studies revealed that the current produced by this biofilm was markedly higher than the wild-type strains (approximately 100-fold). Thus, demonstrating the role of GSU1771 in the EET pathway and establishing a methodology to develop highly electroactive G. sulfurreducens mutants.
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9
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Guo F, Babauta JT, Beyenal H. The effect of additional salinity on performance of a phosphate buffer saline buffered three-electrode bioelectrochemical system inoculated with wastewater. BIORESOURCE TECHNOLOGY 2021; 320:124291. [PMID: 33157437 DOI: 10.1016/j.biortech.2020.124291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 10/14/2020] [Accepted: 10/15/2020] [Indexed: 06/11/2023]
Abstract
In bioelectrochemical system (BES), phosphate buffer saline (PBS) is usually used to achieve a suitable pH condition, which also increases electrolyte salinity. A series of factors that change with salinity will affect BES performance. To simplify the scenario, a three-electrode BES is used to investigate how additional salinity affects the performance of a 50 mM PBS-buffered BES. Results demonstrated that current production decreased with increasing salinity and the dominant exoelectrogens were not inhibited with the addition of 200 mM NaCl. The distribution of system resistance was analyzed by electrochemical impedance spectroscopy. Compared to the decreased solution and biofilm resistance, the increased interfacial resistance that accounted for up to 97.8% of total resistance was the dominant reason for the decreased current production with the increasing additional salinity. The effects of additional salinity on acetate degradation and columbic efficiency were also analyzed.
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Affiliation(s)
- Fei Guo
- School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu 610039, China; The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA.
| | - Jerome T Babauta
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
| | - Haluk Beyenal
- The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA, USA
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10
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Burge SR, Hristovski KD, Burge RG, Hoffman DA, Saboe D, Chao P, Taylor E, Koenigsberg SS. Microbial potentiometric sensor: A new approach to longstanding challenges. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 742:140528. [PMID: 32623171 DOI: 10.1016/j.scitotenv.2020.140528] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 06/24/2020] [Accepted: 06/24/2020] [Indexed: 05/12/2023]
Abstract
The underlying hypothesis of this study is that simple potentiometric measurements between sensing electrodes and a shared reference electrode - Microbial Potentiometric Sesnor (MPS) system - can be employed in a long-term, continuous mode of operation to resolve the spatial and temporal changes in environmental systems. To address the hypothesis, (1) a conceptual description of the MPS system and its postulated principle of operation are provided; (2) the MPS system performance is documented under controlled laboratory conditions; and (3) the capabilities of the MPS system are documented under quiescent and dynamic field condition. In a laboratory setting, the variability among different MPS signals was insignificant confirming the postulated high accuracy and reproducibility of the sensor performance. It also demonstrated statistically significant correlations with dissolved oxygen (DO) and oxidation-reduction potential (ORP) sensors, while showing capabilities of operating under anoxic and anaerobic conditions. Regardless of their locations in the model wetland system, three MPS sensors functioned without interruption and cleaning for a period >2 years, and thus demonstrating long-term durability of the MPS technology. In real batch-wastewater treatment facility, the deployed MPS system signals were able to describe the organic carbon trends and correlate with each treatment phase in a cycle. Data reproducibility and reliability exceeded the expectations better describing the carbon treatment levels than the DO and ORP sensors (p < 4.4 × 10-162 vs phase adjusted p < 3.0 × 10-58). While MPS signals correlate with specific parameters that describe the local process or environments, it is more prudent to employ both the magnitude and pattern of a composite signal like the MPS signal describe the change to reflect any shift in the local environment. When compared to a baseline pattern, this change in signal magnitude and pattern reveals important information that can be employed to tailor and optimize any condition or process which involves microorganisms.
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Affiliation(s)
- Scott R Burge
- Burge Environmental Inc., 6100 South Maple Avenue, Suite 114, Tempe, AZ 85283, USA
| | - Kiril D Hristovski
- The Polytechnic School, Ira A. Fulton, Schools of Engineering, Arizona State University - Polytechnic Campus, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, USA.
| | - Russell G Burge
- Burge Environmental Inc., 6100 South Maple Avenue, Suite 114, Tempe, AZ 85283, USA
| | - David A Hoffman
- Burge Environmental Inc., 6100 South Maple Avenue, Suite 114, Tempe, AZ 85283, USA
| | - Daniel Saboe
- The Polytechnic School, Ira A. Fulton, Schools of Engineering, Arizona State University - Polytechnic Campus, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, USA
| | - PengFei Chao
- Equity Lifestyle Properties Inc., 8700 E. University Dr., Mesa, AZ 85207, United States of America
| | - Evan Taylor
- Burge Environmental Inc., 6100 South Maple Avenue, Suite 114, Tempe, AZ 85283, USA; The Polytechnic School, Ira A. Fulton, Schools of Engineering, Arizona State University - Polytechnic Campus, 7171 E. Sonoran Arroyo Mall, Mesa, AZ 85212, USA
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11
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Cao DX, Yan H, Brus VV, Wong MS, Bazan GC, Nguyen TQ. Visualization of Charge Transfer from Bacteria to a Self-Doped Conjugated Polymer Electrode Surface Using Conductive Atomic Force Microscopy. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40778-40785. [PMID: 32794728 DOI: 10.1021/acsami.0c10795] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In this work, we aim to provide a better understanding of the reasons behind electron transfer inefficiencies between electrogenic bacteria and the electrode in microbial fuel cells. We do so using a self-doped conjugated polyelectrolyte (CPE) as the electrode surface, onto which Geobacter sulfurreducens is placed, then using conductive atomic force microscopy (C-AFM) to directly visualize and quantify the electrons that are transferring from each bacterium to the electrode, thereby helping us gain a better understanding for the overpotential losses in MFCs. In doing so, we obtain images that show G. sulfurreducens can directly transfer electrons to an electrode surface without the use of pili, and that overpotential losses are likely due to cell death and poor distribution or performance of individual bacterium's OmcB cytochromes. This unique combination of CPEs with C-AFM can also be used for other studies where electron transfer loss mechanisms need to be understood on the nanoscale, allowing for direct visualization of potential issues in these systems.
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Affiliation(s)
- David Xi Cao
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Hengjing Yan
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Viktor V Brus
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Matthew S Wong
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Guillermo C Bazan
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Thuc-Quyen Nguyen
- Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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12
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Guardia AE, Beligni MV, Cortéz N, Busalmen J. Electrochemistry of R. palustris Azul during phototrophic growth. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Electrogenic Biofilm Development Determines Charge Accumulation and Resistance to pH Perturbation. ENERGIES 2020. [DOI: 10.3390/en13143521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The electrogenic biofilm and the bio-electrode interface are the key biocatalytic components in bioelectrochemical systems (BES) and can have a large impact on cell performance. This study used four different anodic carbons to investigate electrogenic biofilm development to determine the influence of charge accumulation and biofilm growth on system performance and how biofilm structure may mitigate against pH perturbations. Power production was highest (1.40 W/m3) using carbon felt, but significant power was also produced when felt carbon was open-circuit acclimated in a control reactor (0.95 W/m3). The influence of carbon material on electrogenic biofilm development was determined by measuring the level of biofilm growth, using sequencing to identify the microbial populations and confocal microscopy to understand the spatial locations of key microbial groups. Geobacter spp. were found to be enriched in closed-circuit operation and these were in close association with the carbon anode, but these were not observed in the open-circuit controls. Electrochemical analysis also demonstrated that the highest mid-point anode potentials were close to values reported for cytochromes from Geobacter sulfurreductans. Biofilm development was greatest in felt anodes (closed-circuit acclimated 1209 ng/μL DNA), and this facilitated the highest pseudo-capacitive values due to the presence of redox-active species, and this was associated with higher levels of power production and also served to mitigate against the effects of low-pH operation. Supporting carbon anode structures are key to electrogenic biofilm development and associated system performance and are also capable of protecting electrochemically active bacteria from the effects of environmental perturbations.
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14
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Ter Heijne A, Pereira MA, Pereira J, Sleutels T. Electron Storage in Electroactive Biofilms. Trends Biotechnol 2020; 39:34-42. [PMID: 32646618 DOI: 10.1016/j.tibtech.2020.06.006] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/05/2020] [Accepted: 06/09/2020] [Indexed: 10/23/2022]
Abstract
Microbial electrochemical technologies (METs) are promising for sustainable applications. Recently, electron storage during intermittent operation of electroactive biofilms (EABs) has been shown to play an important role in power output and electron efficiencies. Insights into electron storage mechanisms, and the conditions under which these occur, are essential to improve microbial electrochemical conversions and to optimize biotechnological processes. Here, we discuss the two main mechanisms for electron storage in EABs: storage in the form of reduced redox active components in the electron transport chain and in the form of polymers. We review electron storage in EABs and in other microorganisms and will discuss how the mechanisms of electron storage can be influenced.
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Affiliation(s)
- A Ter Heijne
- Environmental Technology, Wageningen University and Research, Wageningen, The Netherlands.
| | - M A Pereira
- CEB - Centre of Biological Engineering, University of Minho, Braga, Portugal
| | - J Pereira
- Environmental Technology, Wageningen University and Research, Wageningen, The Netherlands; Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands
| | - T Sleutels
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Leeuwarden, The Netherlands
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15
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Wang B, Liu W, Zhang Y, Wang A. Bioenergy recovery from wastewater accelerated by solar power: Intermittent electro-driving regulation and capacitive storage in biomass. WATER RESEARCH 2020; 175:115696. [PMID: 32179273 DOI: 10.1016/j.watres.2020.115696] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 03/04/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Electroactive microorganisms (EAMs) can act as pseudocapacitor to store energy and discharge electrons on need, while electromethanogens acting as receptor are able to utilize electrons, protons and carbon dioxide for methanization. However, external energy is required to overcome thermodynamical barriers for electromethanogenesis. Herein, electro-driving power by solar light was established to accelerate conversion of waste organics to bioenergy. The intermittent power supply modes were elucidated for favourable performances (e.g., current density, methane production rate, energy recovery efficiencies and economic evaluation), compared with the control driven by continuous applied voltage. It was found that natural intermittent solar-powered mode was more beneficial for microorganisms involved in electron transfer and energy recovery than manual sharp on-off mode. Electrochemistry analysis unrevealed that a higher redox current and lower resistance were exhibited under the solar-powered mode. A high charge storage capacity and electron mobility were found through cytochrome c content and live cells ratio in the solar-power assisted bioreactor. The intermittent power driving modes can regulate electron transfer proteins with capacitive storage behavior in biomass, which helps to understand the responses of functional communities on the stress of intermittent electric field. These findings indicate a promising perspective of microbial biotechnology driven by solar power to boost bioenergy recovery from waste/wastewater.
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Affiliation(s)
- Bo Wang
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; Department of Environmental Engineering, Technical University of Denmark, DK, 2800, Lyngby, Denmark; Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049, China; Sino-Danish Center for Education and Research, Beijing, 100190, China
| | - Wenzong Liu
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, DK, 2800, Lyngby, Denmark
| | - Aijie Wang
- CAS Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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16
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Semenec L, Vergara IA, Laloo AE, Mathews ER, Bond PL, Franks AE. Enhanced Growth of Pilin-Deficient Geobacter sulfurreducens Mutants in Carbon Poor and Electron Donor Limiting Conditions. MICROBIAL ECOLOGY 2019; 78:618-630. [PMID: 30759269 DOI: 10.1007/s00248-019-01316-8] [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: 03/08/2018] [Accepted: 01/01/2019] [Indexed: 06/09/2023]
Abstract
Geobacter sulfurreducens pili enable extracellular electron transfer and play a role in secretion of c-type cytochromes such as OmcZ. PilA-deficient mutants of G. sulfurreducens have previously been shown to accumulate cytochromes within their membranes. This cytochrome retaining phenotype allowed for enhanced growth of PilA-deficient mutants in electron donor and carbon-limited conditions where formate and fumarate are provided as the sole electron donor and acceptor with no supplementary carbon source. Conversely, wild-type G. sulfurreducens, which has normal secretion of cytochromes, has comparative limited growth in these conditions. This growth is further impeded for OmcZ-deficient and OmcS-deficient mutants. A PilB-deficient mutant which prevents pilin production but allows for secretion of OmcZ had moderate growth in these conditions, indicating a role for cytochrome localization to enabling survival in the electron donor and carbon-limited conditions. To determine which pathways enhanced growth using formate, Sequential Window Acquisition of all Theoretical Mass Spectra mass spectrometry (SWATH-MS) proteomics of formate adapted PilA-deficient mutants and acetate grown wild type was performed. PilA-deficient mutants had an overall decrease in tricarboxylic acid (TCA) cycle enzymes and significant upregulation of electron transport chain associated proteins including many c-type cytochromes and [NiFe]-hydrogenases. Whole genome sequencing of the mutants shows strong convergent evolution and emergence of genetic subpopulations during adaptation to growth on formate. The results described here suggest a role for membrane constrained c-type cytochromes to the enhancement of survival and growth in electron donor and carbon-limited conditions.
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Affiliation(s)
- Lucie Semenec
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, Australia
| | - Ismael A Vergara
- Bioinformatics and Cancer Genomics, Research Division, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - Andrew E Laloo
- Advanced Water Management Centre, The University of Queensland, Brisbane, Queensland, Australia
| | - Elizabeth R Mathews
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, Australia
| | - Philip L Bond
- Advanced Water Management Centre, The University of Queensland, Brisbane, Queensland, Australia
| | - Ashley E Franks
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Melbourne, Victoria, Australia.
- Centre for Future Landscapes, La Trobe University, Melbourne, Australia.
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17
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Supercapacitor/biofuel cell hybrid device employing biomolecules for energy conversion and charge storage. Bioelectrochemistry 2019; 128:94-99. [DOI: 10.1016/j.bioelechem.2019.03.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 03/26/2019] [Accepted: 03/26/2019] [Indexed: 01/12/2023]
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18
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Sudirjo E, Buisman CJN, Strik DPBTB. Marine Sediment Mixed With Activated Carbon Allows Electricity Production and Storage From Internal and External Energy Sources: A New Rechargeable Bio-Battery With Bi-Directional Electron Transfer Properties. Front Microbiol 2019; 10:934. [PMID: 31156566 PMCID: PMC6527962 DOI: 10.3389/fmicb.2019.00934] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 04/12/2019] [Indexed: 11/13/2022] Open
Abstract
Marine sediment has a great potential to generate electricity with a bioelectrochemical system (BES) like the microbial fuel cell (MFC). In this study, we investigated the potential of marine sediment and activated carbon (AC) to generate and store electricity. Both internal and external energy supply was validated for storage behavior. Four types of anode electrode compositions were investigated. Two types were mixtures of different volumes of AC and Dutch Eastern Scheldt marine sediment (67% AC and 33% AC) and the others two were 100% AC or 100% marine sediment based. Each composition was duplicated. Operating these BES's under MFC mode with solely marine sediment as the anode electron donor resulted in the creation of a bio-battery. The recharge time of such bio-battery does depend on the fuel content and its usage. The results show that by usage of marine sediment and AC electricity was generated and stored. The 100% AC and the 67% AC mixed with marine sediment electrode were over long term potentiostatic controlled at -100 mV vs. Ag/AgCl which resulted in a cathodic current and an applied voltage. After switching back to the MFC operation mode at 1000 Ω external load, the electrode turned into an anode and electricity was generated. This supports the hypothesis that external supply electrical energy was recovered via bi-directional electron transfer. With open cell voltage experiments these AC marine bioanodes showed internal supplied electric charge storage up to 100 mC at short self-charging times (10 and 60 s) and up to 2.4°C (3,666 C/m3 anode) at long charging time (1 h). Using a hypothetical cell voltage of 0.2 V, this value represents an internal electrical storage density of 0.3 mWh/kg AC marine anode. Furthermore it was remarkable that the BES with 100% marine sediment based electrode also acted like a capacitor similar to the charge storage behaviors of the AC based bioanodes with a maximum volumetric storage of 1,373 C/m3 anode. These insights give opportunities to apply such BES systems as e.g., ex situ bio-battery to store and use electricity for off-grid purpose in remote areas.
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Affiliation(s)
- Emilius Sudirjo
- Government of Landak Regency, West Kalimantan, Indonesia.,Environmental Technology, Wageningen University & Research, Wageningen, Netherlands
| | - Cees J N Buisman
- Environmental Technology, Wageningen University & Research, Wageningen, Netherlands
| | - David P B T B Strik
- Environmental Technology, Wageningen University & Research, Wageningen, Netherlands
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19
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Schrott GD, Bonanni PS, Busalmen JP. Open circuit potentiometry reports on internal redox states of cells in G. Sulfurreducens biofilms. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.02.078] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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20
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Koók L, Quéméner EDL, Bakonyi P, Zitka J, Trably E, Tóth G, Pavlovec L, Pientka Z, Bernet N, Bélafi-Bakó K, Nemestóthy N. Behavior of two-chamber microbial electrochemical systems started-up with different ion-exchange membrane separators. BIORESOURCE TECHNOLOGY 2019; 278:279-286. [PMID: 30708331 DOI: 10.1016/j.biortech.2019.01.097] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 06/09/2023]
Abstract
In this study, microbial fuel cells (MFCs) - operated with novel cation- and anion-exchange membranes, in particular AN-VPA 60 (CEM) and PSEBS DABCO (AEM) - were assessed comparatively with Nafion proton exchange membrane (PEM). The process characterization involved versatile electrochemical (polarization, electrochemical impedance spectroscopy - EIS, cyclic voltammetry - CV) and biological (microbial structure analysis) methods in order to reveal the influence of membrane-type during start-up. In fact, the use of AEM led to 2-5 times higher energy yields than CEM and PEM and the lowest MFC internal resistance (148 ± 17 Ω) by the end of start-up. Regardless of the membrane-type, Geobacter was dominantly enriched on all anodes. Besides, CV and EIS measurements implied higher anode surface coverage of redox compounds for MFCs and lower membrane resistance with AEM, respectively. As a result, AEM based on PSEBS DABCO could be found as a promising material to substitute Nafion.
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Affiliation(s)
- László Koók
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | | | - Péter Bakonyi
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Jan Zitka
- Institute of Macromolecular Chemistry, AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Eric Trably
- LBE, Univ Montpellier, INRA, Narbonne, France
| | - Gábor Tóth
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
| | - Lukas Pavlovec
- Institute of Macromolecular Chemistry, AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | - Zbynek Pientka
- Institute of Macromolecular Chemistry, AS CR, Heyrovsky Sq. 2, 162 06 Prague 6, Czech Republic
| | | | - Katalin Bélafi-Bakó
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary.
| | - Nándor Nemestóthy
- Research Institute on Bioengineering, Membrane Technology and Energetics, University of Pannonia, Egyetem ut 10, 8200 Veszprém, Hungary
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21
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Zhang X, Rabaey K, Prévoteau A. Reversible Effects of Periodic Polarization on Anodic Electroactive Biofilms. ChemElectroChem 2019. [DOI: 10.1002/celc.201900228] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xu Zhang
- Center for Microbial Ecology and Technology (CMET)Ghent University Coupure Links 653 9000 Ghent Belgium
| | - Korneel Rabaey
- Center for Microbial Ecology and Technology (CMET)Ghent University Coupure Links 653 9000 Ghent Belgium
| | - Antonin Prévoteau
- Center for Microbial Ecology and Technology (CMET)Ghent University Coupure Links 653 9000 Ghent Belgium
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22
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Zhang X, Prévoteau A, Louro RO, Paquete CM, Rabaey K. Periodic polarization of electroactive biofilms increases current density and charge carriers concentration while modifying biofilm structure. Biosens Bioelectron 2018; 121:183-191. [DOI: 10.1016/j.bios.2018.08.045] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/19/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
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23
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Reyes-Vidal Y, López-Maldonado J, Castañeda F, Orozco G, Rivera F. Evaluation of Inlet Design and Flow Rate Effect on Current Density Distribution in a Microbial Electrolysis Cell Using Computational Simulation Techniques, Coupling Hydrodynamics and Bioanode Kinetics. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2018. [DOI: 10.1515/ijcre-2017-0259] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
A theoretical model that describe the effect of design and operational conditions on current density distribution in a bioelectrochemical reactor used as microbial electrolysis cell (MEC) is described in this study. This model is proposed considering an approach where a direct electron transfer mechanism from the biofilm to the electrode surface takes place (mechanism present in most of microbial systems) and is governed by a dual donor-acceptor Nernst-Monod bioelectrochemical kinetic expression. The bioelectrochemical reactor is modelled considering two flow electrochemical reactor designs (a reactor design based in literature reports and a modified system proposed by the authors) operating at different flow inlet velocities and electrical overpotentials.
Results obtained from the numerical solution shows that flow distribution is an essential aspect that impact the reactor performance, since concentration profiles and electrical potential-current distributions are strongly dependent on flow regime. Modified inlet configuration displays a more homogeneous fluid distribution and this behavior directly affects the mass transport and current density performance, as a result higher current density values are obtained for such configuration. Finally, it is expected that the information obtained from the analysis carried out in this report will provide us with a theoretical basis to realize the construction of a bioelectrochemical reactor prototype to develop the MEC concept.
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24
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Semi-continuous measurement of oxygen demand in wastewater using biofilm-capacitance. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.biteb.2018.08.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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25
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Microbial Electrochemical Technologies for Wastewater Treatment: Principles and Evolution from Microbial Fuel Cells to Bioelectrochemical-Based Constructed Wetlands. WATER 2018. [DOI: 10.3390/w10091128] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Microbial electrochemical technologies (MET) rely on the presence of the metabolic activity of electroactive bacteria for the use of solid-state electrodes for oxidizing different kinds of compound that can lead to the synthesis of chemicals, bioremediation of polluted matrices, the treatment of contaminants of interest, as well as the recovery of energy. Keeping these possibilities in mind, there has been growing interest in the use of electrochemical technologies for wastewater treatment, if possible with simultaneous power generation, since the beginning of the present century. In the last few years, there has been growing interest in exploring the possibility of merging MET with constructed wetlands offering a new option of an intensified wetland system that could maintain a high performance with a lower footprint. Based on that interest, this paper explains the general principles of MET, and the different known extracellular electron transfer mechanisms ruling the interaction between electroactive bacteria and potential solid-state electron acceptors. It also looks at the adoption of those principles for the development of MET set-ups for simultaneous wastewater treatment and power generation, and the challenges that the technology faces. Ultimately, the most recent developments in setups that merge MET with constructed wetlands are presented and discussed.
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26
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Santoro C, Arbizzani C, Erable B, Ieropoulos I. Microbial fuel cells: From fundamentals to applications. A review. JOURNAL OF POWER SOURCES 2017; 356:225-244. [PMID: 28717261 PMCID: PMC5465942 DOI: 10.1016/j.jpowsour.2017.03.109] [Citation(s) in RCA: 541] [Impact Index Per Article: 77.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 03/23/2017] [Indexed: 05/03/2023]
Abstract
In the past 10-15 years, the microbial fuel cell (MFC) technology has captured the attention of the scientific community for the possibility of transforming organic waste directly into electricity through microbially catalyzed anodic, and microbial/enzymatic/abiotic cathodic electrochemical reactions. In this review, several aspects of the technology are considered. Firstly, a brief history of abiotic to biological fuel cells and subsequently, microbial fuel cells is presented. Secondly, the development of the concept of microbial fuel cell into a wider range of derivative technologies, called bioelectrochemical systems, is described introducing briefly microbial electrolysis cells, microbial desalination cells and microbial electrosynthesis cells. The focus is then shifted to electroactive biofilms and electron transfer mechanisms involved with solid electrodes. Carbonaceous and metallic anode materials are then introduced, followed by an explanation of the electro catalysis of the oxygen reduction reaction and its behavior in neutral media, from recent studies. Cathode catalysts based on carbonaceous, platinum-group metal and platinum-group-metal-free materials are presented, along with membrane materials with a view to future directions. Finally, microbial fuel cell practical implementation, through the utilization of energy output for practical applications, is described.
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Affiliation(s)
- Carlo Santoro
- Department of Chemical and Biological Engineering, Center Micro-Engineered Materials (CMEM), University of New Mexico, 87106, Albuquerque, NM, USA
| | - Catia Arbizzani
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via Selmi 2, 40126, Bologna, Italy
| | - Benjamin Erable
- University of Toulouse, CNRS, Laboratoire de Génie Chimique, CAMPUS INP – ENSIACET, 4 Allée Emile Monso, CS 84234, 31432, Toulouse Cedex 4, France
| | - Ioannis Ieropoulos
- Bristol BioEnergy Centre, Bristol Robotics Laboratory, T Block, University of the West of England, Frenchay Campus, Coldharbour Ln, Bristol, BS16 1QY, United Kingdom
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27
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Domínguez-Garay A, Quejigo JR, Dörfler U, Schroll R, Esteve-Núñez A. Bioelectroventing: an electrochemical-assisted bioremediation strategy for cleaning-up atrazine-polluted soils. Microb Biotechnol 2017. [PMID: 28643961 PMCID: PMC5743802 DOI: 10.1111/1751-7915.12687] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The absence of suitable terminal electron acceptors (TEA) in soil might limit the oxidative metabolism of environmental microbial populations. Bioelectroventing is a bioelectrochemical strategy that aims to enhance the biodegradation of a pollutant in the environment by overcoming the electron acceptor limitation and maximizing metabolic oxidation. Microbial electroremediating cells (MERCs) are devices that can perform such a bioelectroventing. We also report an overall profile of the 14 C-ATR metabolites and 14 C mass balance in response to the different treatments. The objective of this work was to use MERC principles, under different configurations, to stimulate soil bacteria to achieve the complete biodegradation of the herbicide 14 C-atrazine (ATR) to 14 CO2 in soils. Our study concludes that using electrodes at a positive potential [+600 mV (versus Ag/AgCl)] ATR mineralization was enhanced by 20-fold when compared to natural attenuation in electrode-free controls. Furthermore, ecotoxicological analysis of the soil after the bioelectroventing treatment revealed an effective clean-up in < 20 days. The impact of electrodes on soil bioremediation suggests a promising future for this emerging environmental technology.
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Affiliation(s)
| | - Jose Rodrigo Quejigo
- University of Alcalá, Alcalá de Henares, Madrid, Spain.,Helmholtz Zentrum München, Múnich, Germany
| | | | | | - Abraham Esteve-Núñez
- University of Alcalá, Alcalá de Henares, Madrid, Spain.,IMDEA-WATER Parque Tecnológico de la Universidad de Alcalá, Madrid, Spain
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28
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Robuschi L, Tomba JP, Busalmen JP. Proving Geobacter biofilm connectivity with confocal Raman microscopy. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2016.11.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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29
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30
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Optimization of Bioelectricity Generation in Constructed Wetland-Coupled Microbial Fuel Cell Systems. WATER 2017. [DOI: 10.3390/w9030185] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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31
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Tejedor-Sanz S, Quejigo JR, Berná A, Esteve-Núñez A. The Planktonic Relationship Between Fluid-Like Electrodes and Bacteria: Wiring in Motion. CHEMSUSCHEM 2017; 10:693-700. [PMID: 27860438 DOI: 10.1002/cssc.201601329] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 11/01/2016] [Indexed: 06/06/2023]
Abstract
We have explored a new concept in bacteria-electrode interaction based on the use of fluid-like electrodes and planktonic living cells. We show for the first time that living in a biofilm is not a strict requirement for Geobacter sulfurreducens to exchange electrons with an electrode. The growth of planktonic electroactive G. sulfurreducens could be supported by a fluid-like anode as soluble electron acceptors and with electron transfer rates similar to those reported for electroactive biofilms. This growth was maintained by uncoupling the charge (catabolism) and discharge (extracellular respiration) processes of the cells. Our results reveal a novel method to culture electroactive bacteria in which every single cell in the medium could be instantaneously wired to a fluid-like electrode. Direct extracellular electron transfer is occurring but with a new paradigm behind the bacteria-electrode interaction.
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Affiliation(s)
- Sara Tejedor-Sanz
- Department of Chemical Engineering, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
- Innovation and Technology Department, FCC Aqualia, S.A., Madrid, Spain
| | - Jose Rodrigo Quejigo
- Department of Chemical Engineering, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
| | - Antonio Berná
- IMDEA Water, Parque Tecnológico de Alcalá, Alcalá de Henares, Madrid, Spain
| | - Abraham Esteve-Núñez
- Department of Chemical Engineering, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
- IMDEA Water, Parque Tecnológico de Alcalá, Alcalá de Henares, Madrid, Spain
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32
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Li DB, Huang YX, Li J, Li LL, Tian LJ, Yu HQ. Electrochemical activities of Geobacter biofilms growing on electrodes with various potentials. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2016.12.146] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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33
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Houghton J, Santoro C, Soavi F, Serov A, Ieropoulos I, Arbizzani C, Atanassov P. Supercapacitive microbial fuel cell: Characterization and analysis for improved charge storage/delivery performance. BIORESOURCE TECHNOLOGY 2016; 218:552-60. [PMID: 27400393 PMCID: PMC5001197 DOI: 10.1016/j.biortech.2016.06.105] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 06/23/2016] [Accepted: 06/25/2016] [Indexed: 05/05/2023]
Abstract
Supercapacitive microbial fuel cells with various anode and cathode dimensions were investigated in order to determine the effect on cell capacitance and delivered power quality. The cathode size was shown to be the limiting component of the system in contrast to anode size. By doubling the cathode area, the peak power output was improved by roughly 120% for a 10ms pulse discharge and internal resistance of the cell was decreased by ∼47%. A model was constructed in order to predict the performance of a hypothetical cylindrical MFC design with larger relative cathode size. It was found that a small device based on conventional materials with a volume of approximately 21cm(3) would be capable of delivering a peak power output of approximately 25mW at 70mA, corresponding to ∼1300Wm(-3).
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Affiliation(s)
- Jeremiah Houghton
- Department of Chemical & Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA
| | - Carlo Santoro
- Department of Chemical & Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA
| | - Francesca Soavi
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, Via Selmi, 2, 40126 Bologna, Italy
| | - Alexey Serov
- Department of Chemical & Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA
| | - Ioannis Ieropoulos
- Bristol BioEnergy Centre, Bristol Robotics Laboratory, Block T, UWE, Coldharbour Lane, Bristol BS16 1QY, UK; Biological, Biomedical and Analytical Sciences, UWE, Coldharbour Lane, Bristol BS16 1QY, UK
| | - Catia Arbizzani
- Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - Università di Bologna, Via Selmi, 2, 40126 Bologna, Italy
| | - Plamen Atanassov
- Department of Chemical & Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, NM 87131, USA.
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34
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Nguyen VK, Park Y, Yu J, Lee T. Simultaneous arsenite oxidation and nitrate reduction at the electrodes of bioelectrochemical systems. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:19978-19988. [PMID: 27438874 DOI: 10.1007/s11356-016-7225-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2016] [Accepted: 07/11/2016] [Indexed: 06/06/2023]
Abstract
Arsenic and nitrate contaminations in the soil and groundwater have urged the scientific community to explore suitable technologies for treatment of both contaminants. This study reports, for the first time, a novel application of bioelectrochemical systems for coupling As detoxification at the anode and denitrification at the cathode. A similar As(III) oxidation efficiency was achieved when anode potential was controlled by a potentiostat or a direct current (DC) power supply. However, a slightly lower nitrate reduction rate was obtained in reactors using DC power supply during simultaneous operation of nitrate reduction and As(III) oxidation. Microbial community analysis by denaturing gradient gel electrophoresis indicated the presence of some autotrophic As(III)-oxidizing bacteria, including Achromobacter spp., Ensifer spp., and Sinorhizobium spp., that can flexibly switch their original metabolism of using oxygen as sole electron acceptor to a new metabolism mode of using solid-state anode as sole electron acceptor driving for As(III) oxidation under anaerobic conditions. Although further research is required for validating their applicability, bioelectrochemical systems represent a brilliant technology for remediation of groundwater contaminated with nitrate and/or arsenite.
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Affiliation(s)
- Van Khanh Nguyen
- Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63, Geumjeong-gu, Busan, 46241, Republic of Korea
| | - Younghyun Park
- Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63, Geumjeong-gu, Busan, 46241, Republic of Korea
| | - Jaecheul Yu
- Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63, Geumjeong-gu, Busan, 46241, Republic of Korea
| | - Taeho Lee
- Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63, Geumjeong-gu, Busan, 46241, Republic of Korea.
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35
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Wu Y, Li F, Liu T, Han R, Luo X. pH dependence of quinone-mediated extracellular electron transfer in a bioelectrochemical system. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.07.122] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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36
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Nguyen VK, Park Y, Yu J, Lee T. Microbial selenite reduction with organic carbon and electrode as sole electron donor by a bacterium isolated from domestic wastewater. BIORESOURCE TECHNOLOGY 2016; 212:182-189. [PMID: 27099943 DOI: 10.1016/j.biortech.2016.04.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 04/02/2016] [Accepted: 04/10/2016] [Indexed: 06/05/2023]
Abstract
Selenium is said to be multifaceted element because it is essential at a low concentration but very toxic at an elevated level. For the purpose of screening a potential microorganism for selenite bioremediation, we isolated a bacterium, named strain THL1, which could perform both heterotrophic selenite reduction, using organic carbons such as acetate, lactate, propionate, and butyrate as electron donors under microaerobic condition, and electrotrophic selenite reduction, using an electrode polarized at -0.3V (vs. standard hydrogen electrode) as the sole electron donor under anaerobic condition. This bacterium determined to be a new strain of the genus Cronobacter, could remove selenite with an efficiency of up to 100%. This study is the first demonstration on a pure culture could take up electrons from an electrode to perform selenite reduction. The selenium nanoparticles produced by microbial selenite reduction might be considered for recovery and use in the nanotechnology industry.
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Affiliation(s)
- Van Khanh Nguyen
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Younghyun Park
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Jaecheul Yu
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea
| | - Taeho Lee
- Department of Civil and Environmental Engineering, Pusan National University, Pusan 609-735, Republic of Korea.
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37
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Pous N, Carmona-Martínez AA, Vilajeliu-Pons A, Fiset E, Bañeras L, Trably E, Balaguer MD, Colprim J, Bernet N, Puig S. Bidirectional microbial electron transfer: Switching an acetate oxidizing biofilm to nitrate reducing conditions. Biosens Bioelectron 2016; 75:352-8. [DOI: 10.1016/j.bios.2015.08.035] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 07/02/2015] [Accepted: 08/17/2015] [Indexed: 11/24/2022]
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38
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Virdis B, Millo D, Donose BC, Lu Y, Batstone DJ, Krömer JO. Analysis of electron transfer dynamics in mixed community electroactive microbial biofilms. RSC Adv 2016. [DOI: 10.1039/c5ra15676a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electrochemically active microbial biofilms are capable to produce electric current when grown onto electrodes. This work investigates the dynamics of electron transfer inside the biofilm as well as at the biofilm/electrode interface.
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Affiliation(s)
- Bernardino Virdis
- The University of Queensland
- Centre for Microbial Electrochemical Systems (CEMES)
- Brisbane
- Australia
- The University of Queensland
| | - Diego Millo
- Biomolecular Spectroscopy/LaserLaB Amsterdam
- Vrije Universiteit Amsterdam
- NL-1081 HV Amsterdam
- The Netherlands
| | - Bogdan C. Donose
- The University of Queensland
- Centre for Microbial Electrochemical Systems (CEMES)
- Brisbane
- Australia
- The University of Queensland
| | - Yang Lu
- The University of Queensland
- Advanced Water Management Centre (AWMC)
- Brisbane
- Australia
| | - Damien J. Batstone
- The University of Queensland
- Advanced Water Management Centre (AWMC)
- Brisbane
- Australia
| | - Jens O. Krömer
- The University of Queensland
- Centre for Microbial Electrochemical Systems (CEMES)
- Brisbane
- Australia
- The University of Queensland
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39
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Combined bioelectrochemical–electrical model of a microbial fuel cell. Bioprocess Biosyst Eng 2015; 39:267-76. [DOI: 10.1007/s00449-015-1510-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 11/18/2015] [Indexed: 10/22/2022]
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40
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Screen-Printed Electrodes: New Tools for Developing Microbial Electrochemistry at Microscale Level. ENERGIES 2015. [DOI: 10.3390/en81112366] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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41
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Peng X, Chu X, Liu W, Wang S, Zou Y, Wang X. Bioelectricity-generating behavior of a chemically modified carbon black anode in microbial fuel cells. CHINESE JOURNAL OF CATALYSIS 2015. [DOI: 10.1016/s1872-2067(15)60880-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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42
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Kracke F, Vassilev I, Krömer JO. Microbial electron transport and energy conservation - the foundation for optimizing bioelectrochemical systems. Front Microbiol 2015; 6:575. [PMID: 26124754 PMCID: PMC4463002 DOI: 10.3389/fmicb.2015.00575] [Citation(s) in RCA: 318] [Impact Index Per Article: 35.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/25/2015] [Indexed: 12/23/2022] Open
Abstract
Microbial electrochemical techniques describe a variety of emerging technologies that use electrode–bacteria interactions for biotechnology applications including the production of electricity, waste and wastewater treatment, bioremediation and the production of valuable products. Central in each application is the ability of the microbial catalyst to interact with external electron acceptors and/or donors and its metabolic properties that enable the combination of electron transport and carbon metabolism. And here also lies the key challenge. A wide range of microbes has been discovered to be able to exchange electrons with solid surfaces or mediators but only a few have been studied in depth. Especially electron transfer mechanisms from cathodes towards the microbial organism are poorly understood but are essential for many applications such as microbial electrosynthesis. We analyze the different electron transport chains that nature offers for organisms such as metal respiring bacteria and acetogens, but also standard biotechnological organisms currently used in bio-production. Special focus lies on the essential connection of redox and energy metabolism, which is often ignored when studying bioelectrochemical systems. The possibility of extracellular electron exchange at different points in each organism is discussed regarding required redox potentials and effect on cellular redox and energy levels. Key compounds such as electron carriers (e.g., cytochromes, ferredoxin, quinones, flavins) are identified and analyzed regarding their possible role in electrode–microbe interactions. This work summarizes our current knowledge on electron transport processes and uses a theoretical approach to predict the impact of different modes of transfer on the energy metabolism. As such it adds an important piece of fundamental understanding of microbial electron transport possibilities to the research community and will help to optimize and advance bioelectrochemical techniques.
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Affiliation(s)
- Frauke Kracke
- Centre for Microbial Electrochemical Systems, The University of Queensland, Brisbane QLD, Australia ; Advanced Water Management Centre, The University of Queensland, Brisbane QLD, Australia
| | - Igor Vassilev
- Centre for Microbial Electrochemical Systems, The University of Queensland, Brisbane QLD, Australia ; Advanced Water Management Centre, The University of Queensland, Brisbane QLD, Australia
| | - Jens O Krömer
- Centre for Microbial Electrochemical Systems, The University of Queensland, Brisbane QLD, Australia ; Advanced Water Management Centre, The University of Queensland, Brisbane QLD, Australia
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43
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Blanchet E, Desmond E, Erable B, Bridier A, Bouchez T, Bergel A. Comparison of synthetic medium and wastewater used as dilution medium to design scalable microbial anodes: Application to food waste treatment. BIORESOURCE TECHNOLOGY 2015; 185:106-115. [PMID: 25765989 DOI: 10.1016/j.biortech.2015.02.097] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 02/13/2015] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
The objective was to replace synthetic medium by wastewater as a strategy to design low-cost scalable bioanodes. The addition of activated sludge was necessary to form primary bioanodes that were then used as the inoculum to form the secondary bioanodes. Bioanodes formed in synthetic medium with acetate 10mM provided current densities of 21.9±2.1A/m(2), while bioanodes formed in wastewater gave 10.3±0.1A/m(2). The difference was explained in terms of biofilm structure, electrochemical kinetics and redox charge content of the biofilms. In both media, current densities were straightforwardly correlated with the biofilm enrichment in Geobacteraceae but, inside this family, Geobacter sulfurreducens and an uncultured Geobacter sp. were dominant in the synthetic medium, while growth of another Geobacter sp. was favoured in wastewater. Finally, the primary/secondary procedure succeeded in designing bioanodes to treat food wastes by using wastewater as dilution medium, with current densities of 7±1.1A/m(2).
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Affiliation(s)
- Elise Blanchet
- Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France.
| | - Elie Desmond
- Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France
| | - Benjamin Erable
- Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France
| | - Arnaud Bridier
- Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France
| | - Théodore Bouchez
- Irstea, UR HBAN, 1 rue Pierre-Gilles de Gennes, 92761 Antony cedex, France
| | - Alain Bergel
- Laboratoire de Génie Chimique (LGC), CNRS, Université de Toulouse (INPT), 4 allée Emile Monso, BP 84234, 31432 Toulouse, France
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44
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Estevez-Canales M, Kuzume A, Borjas Z, Füeg M, Lovley D, Wandlowski T, Esteve-Núñez A. A severe reduction in the cytochrome C content of Geobacter sulfurreducens eliminates its capacity for extracellular electron transfer. ENVIRONMENTAL MICROBIOLOGY REPORTS 2015; 7:219-226. [PMID: 25348891 DOI: 10.1111/1758-2229.12230] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Accepted: 09/23/2014] [Indexed: 06/04/2023]
Abstract
The ability of Geobacter species to transfer electrons outside the cell enables them to play an important role in a number of biogeochemical and bioenergy processes. Gene deletion studies have implicated periplasmic and outer-surface c-type cytochromes in this extracellular electron transfer. However, even when as many as five c-type cytochrome genes have been deleted, some capacity for extracellular electron transfer remains. In order to evaluate the role of c-type cytochromes in extracellular electron transfer, Geobacter sulfurreducens was grown in a low-iron medium that included the iron chelator (2,2'-bipyridine) to further sequester iron. Haem-staining revealed that the cytochrome content of cells grown in this manner was 15-fold lower than in cells exposed to a standard iron-containing medium. The low cytochrome abundance was confirmed by in situ nanoparticle-enhanced Raman spectroscopy (NERS). The cytochrome-depleted cells reduced fumarate to succinate as well as the cytochrome-replete cells do, but were unable to reduce Fe(III) citrate or to exchange electrons with a graphite electrode. These results demonstrate that c-type cytochromes are essential for extracellular electron transfer by G. sulfurreducens. The strategy for growing cytochrome-depleted G. sulfurreducens will also greatly aid future physiological studies of Geobacter species and other microorganisms capable of extracellular electron transfer.
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Affiliation(s)
- Marta Estevez-Canales
- Department of Chemical Engineering, University of Alcalá, Alcalá de Henares, Madrid, Spain
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45
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Pous N, Casentini B, Rossetti S, Fazi S, Puig S, Aulenta F. Anaerobic arsenite oxidation with an electrode serving as the sole electron acceptor: a novel approach to the bioremediation of arsenic-polluted groundwater. JOURNAL OF HAZARDOUS MATERIALS 2015; 283:617-22. [PMID: 25464303 DOI: 10.1016/j.jhazmat.2014.10.014] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/02/2014] [Accepted: 10/04/2014] [Indexed: 05/20/2023]
Abstract
Arsenic contamination of soil and groundwater is a serious problem worldwide. Here we show that anaerobic oxidation of As(III) to As(V), a form which is more extensively and stably adsorbed onto metal-oxides, can be achieved by using a polarized (+497 mV vs. SHE) graphite anode serving as terminal electron acceptor in the microbial metabolism. The characterization of the microbial populations at the electrode, by using in situ detection methods, revealed the predominance of gammaproteobacteria. In principle, the proposed bioelectrochemical oxidation process would make it possible to provide As(III)-oxidizing microorganisms with a virtually unlimited, low-cost and low-maintenance electron acceptor as well as with a physical support for microbial attachment.
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Affiliation(s)
- Narcis Pous
- Laboratory of Chemical and Environmental Engineering (LEQUiA), Institute of the Environment, University of Girona, C/Maria Aurèlia Capmany, 69 E-17071 Girona, Spain
| | - Barbara Casentini
- Water Research Institute (IRSA-CNR), National Research Council, Via Salaria Km 29.300, 00015 Monterotondo, Italy
| | - Simona Rossetti
- Water Research Institute (IRSA-CNR), National Research Council, Via Salaria Km 29.300, 00015 Monterotondo, Italy
| | - Stefano Fazi
- Water Research Institute (IRSA-CNR), National Research Council, Via Salaria Km 29.300, 00015 Monterotondo, Italy
| | - Sebastià Puig
- Laboratory of Chemical and Environmental Engineering (LEQUiA), Institute of the Environment, University of Girona, C/Maria Aurèlia Capmany, 69 E-17071 Girona, Spain
| | - Federico Aulenta
- Water Research Institute (IRSA-CNR), National Research Council, Via Salaria Km 29.300, 00015 Monterotondo, Italy.
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46
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Electroactive bacteria—molecular mechanisms and genetic tools. Appl Microbiol Biotechnol 2014; 98:8481-95. [DOI: 10.1007/s00253-014-6005-z] [Citation(s) in RCA: 153] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 07/28/2014] [Accepted: 07/30/2014] [Indexed: 12/15/2022]
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47
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48
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Microbial nanowires for bioenergy applications. Curr Opin Biotechnol 2014; 27:88-95. [DOI: 10.1016/j.copbio.2013.12.003] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 11/22/2013] [Accepted: 12/06/2013] [Indexed: 11/23/2022]
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49
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Bagkos G, Koufopoulos K, Piperi C. A new model for mitochondrial membrane potential production and storage. Med Hypotheses 2014; 83:175-81. [PMID: 24907229 DOI: 10.1016/j.mehy.2014.05.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Accepted: 05/10/2014] [Indexed: 02/05/2023]
Abstract
Mitochondrial membrane potential (MMP) is the most reliable indicator of mitochondrial function. The MMP value range of -136 to -140mV has been considered optimal for maximum ATP production for all living organisms. Even small changes from the above range result in a large fall in ATP production and a large increase in ROS production. The resulting bioenergetic deregulation is considered as the causative agent for numerous major human diseases. Normalization of MMP value improves mitochondrial function and gives excellent therapeutic results. In order for a systematic effective treatment of these diseases to be developed, a detailed knowledge of the mechanism of MMP production is absolutely necessary. However, despite the long-standing research efforts, a concrete mechanism for MMP production has not been found yet. The present paper proposes a novel mechanism of MMP production based on new considerations underlying the function of the two basic players of MMP production, the electron transport chain (ETC) and the F1F0 ATP synthase. Under normal conditions, MMP is almost exclusively produced by the electron flow through ETC complexes I-IV, creating a direct electric current that stops in subunit II of complex IV and gradually charges MMP. However, upon ETC dysfunction F1F0 ATP synthase reverses its action and starts to hydrolyze ATP. ATP hydrolysis further produces electric energy which is transferred, in the form of a direct electric current, from F1 to F0 where is used to charge MMP. This new model is expected to redirect current experimental research on mitochondrial bioenergetics and indicate new therapeutic schemes for mitochondrial disorders.
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Affiliation(s)
- Georgios Bagkos
- Department of Biological Chemistry, University of Athens Medical School, Athens, Greece
| | - Kostas Koufopoulos
- Department of Biological Chemistry, University of Athens Medical School, Athens, Greece
| | - Christina Piperi
- Department of Biological Chemistry, University of Athens Medical School, Athens, Greece.
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50
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Schrott GD, Ordoñez MV, Robuschi L, Busalmen JP. Physiological stratification in electricity-producing biofilms of Geobacter sulfurreducens. CHEMSUSCHEM 2014; 7:598-603. [PMID: 24307451 DOI: 10.1002/cssc.201300605] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Revised: 09/27/2013] [Indexed: 06/02/2023]
Abstract
The elucidation of mechanisms and limitations in electrode respiration by electroactive biofilms is significant for the development of rapidly emerging clean energy production and wastewater treatment technologies. In Geobacter sulfurreducens biofilms, the controlling steps in current production are thought to be the metabolic activity of cells, but still remain to be determined. By quantifying the DNA, RNA, and protein content during the long-term growth of biofilms on polarized graphite electrodes, we show in this work that current production becomes independent of DNA accumulation immediately after a maximal current is achieved. Indeed, the mean respiratory rate of biofilms rapidly decreases after this point, which indicates the progressive accumulation of cells that do not contribute to current production or contribute to a negligible extent. These results support the occurrence of physiological stratification within biofilms as a consequence of respiratory limitations imposed by limited biofilm conductivity.
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Affiliation(s)
- Germán David Schrott
- División Electroquímica y Corrosión INTEMA-CONICET-UNMdP, Juan B Justo 4302, B7608FDQ, Mar del Plata (Argentina).
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