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Yakdhane E, Tőzsér D, Haykir O, Yakdhane A, Labidi S, Kiskó G, Baranyai L. Recognition of environmental contaminant and pathogenic bacteria by means of redox potential methodology. MethodsX 2024; 13:102811. [PMID: 39022177 PMCID: PMC11253682 DOI: 10.1016/j.mex.2024.102811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 06/18/2024] [Indexed: 07/20/2024] Open
Abstract
The time-consuming nature of culturing methods has urged the exploration of rapid modern technologies. One promising alternative utilizes redox potential, which describes the oxidative changes within complex media, indicating oxygen and nutrient consumption, as well as the production of reduced substances in the investigated biological system. Redox potential measurement can detect microbial activity within 16 h, what is significantly faster than the minimum 24 h incubation time of the reference plate counting technique. The redox potential based method can be specific with selective media, but bacterial strains have unique kinetic pattern as well. The proposed method suggests evaluation of the curve shape for the differentiation of environmental contaminant and pathogenic microbial strains. Six bacterial species were used in validation (Escherichia coli, Pseudomonas aeruginosa, Salmonella enterica, Listeria innocua, Listeria monocytogenes, and Listeria ivanovii). Descriptive parameters reached 98.2 % accuracy and Gompertz model achieved 91.6 % accuracy in classification of the selected 6 bacteria species.•Mathematical model (Gompertz function) and first order descriptive parameters are suggested to describe the specific shape of redox potential curves, while Support Vector Machine (SVM) is recommended for classification.•Due to the concentration dependent time to detection (TTD), pre-processing applies standardization according to the inflection point time.
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Affiliation(s)
- Eya Yakdhane
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
| | - Dóra Tőzsér
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2., Hungary
| | - Oktay Haykir
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
| | - Asma Yakdhane
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
| | - Sabrine Labidi
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
| | - Gabriella Kiskó
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
| | - László Baranyai
- Institute of Food Science and Technology, Hungarian University of Agriculture and Life Sciences (MATE), Budapest 1118, Hungary
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Park S, Kim K, Hibino T, Kim K. Machine learning-based prediction of seasonal hypoxia in eutrophic estuary using capacitive potentiometric sensor. MARINE ENVIRONMENTAL RESEARCH 2024; 196:106445. [PMID: 38489919 DOI: 10.1016/j.marenvres.2024.106445] [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: 01/21/2024] [Revised: 02/26/2024] [Accepted: 03/10/2024] [Indexed: 03/17/2024]
Abstract
A hypoxia occurred in eutrophic estuary was predicted using long short-term memory (LSTM) model with prediction time steps (PTSs) of 0, 1, 12, and 24 h. A capacitive potential (CP), which provides quantitative information on dissolved oxygen (DO) concentration, was used as a predictor along with precipitation, tide level, salinity, and water temperature. First, annual changes in DO concentration were clustered in three phases of annual DO trends (oversaturation, depletion, and stable) using k-means clustering. CP was the most influential variable in clustering the DO phases. The LSTM was implemented to predict the DO phases and hypoxia occurrences. In the simultaneous prediction of the depletion phase and hypoxia occurrence with a 12 h PTS, the accuracy was 92.1% using CP along with other variables; it was 3.3% higher than that achieved using variables other than CP. In the case of predicting the depletion phase and hypoxia non-occurrence using CP along with other variables, the accuracy was 61.1%, which was 5.5% higher than that when CP was not used. When using CP along with other variables, the total accuracy was highest for all PTS. Overall, the utilization of CP and machine learning techniques enables accurate predictions of both short-term and long-term hypoxia occurrences, providing us with the opportunity to proactively respond to disasters in aquaculture and environmental management due to hypoxia.
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Affiliation(s)
- Seongsik Park
- Department of Ocean Engineering, Pukyong National University, Busan, Republic of Korea.
| | - Kyunghoi Kim
- Department of Ocean Engineering, Pukyong National University, Busan, Republic of Korea
| | - Tadashi Hibino
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Japan
| | - Kyeongmin Kim
- Faculty of Global Interdisciplinary Science and Innovation, Shizuoka University, Shizuoka, Japan.
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Wu D, Zhang Z, Li X, Han J, Hu Q, Yu Y, Mao Z. Cucurbit[10]uril-based supramolecular radicals: Powerful arms to kill facultative anaerobic bacteria. J Control Release 2023; 354:626-634. [PMID: 36681280 DOI: 10.1016/j.jconrel.2023.01.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 01/11/2023] [Accepted: 01/14/2023] [Indexed: 01/23/2023]
Abstract
Two water-soluble supramolecular complexes (CB[10]⊃PSA and CB[10]⊃TPE-cyc) are constructed based on the host-guest interaction between cucurbit[10]uril (CB[10]) and perylene diimide derivative (PSA) or tetracationic cyclophane (TPE-cyc). Attributing to the matched redox potential, both supramolecular complexes can be specifically reduced into corresponding supramolecular radical cations or anions by facultative anaerobic E. coli. Benefiting from the strong near-infrared (NIR) absorption, CB[10]⊃PSA radical anions and CB[10]⊃TPE-cyc radical cations act as efficient NIR photosensitizers and perform an excellent antimicrobial activity (close to 100%) via PTT. In addition, the biocompatibility of TPE-cyc is notably improved under the protection of CB[10], guaranteeing its biosafety for in vivo application. CB[10]⊃PSA radical anions and CB[10]⊃TPE-cyc radical cations are in situ generated in the E. coli-infected abscess of mice and effectively inhibit the bacterial infection without obvious system toxicity. It is anticipated that this supramolecular strategy may pave a new way for the selective bacteria inhibition to regulate the balance of different bacterial flora.
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Affiliation(s)
- Dan Wu
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Zhankui Zhang
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Xinyue Li
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China
| | - Jin Han
- College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China..
| | - Qinglian Hu
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou 310014, PR China..
| | - Yuan Yu
- Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology, Zhejiang Sci-Tech University, Hangzhou 310018, PR China..
| | - Zhengwei Mao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, PR China..
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Advanced Monitoring and Control of Redox Potential in Wine Fermentation across Scales. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation9010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Combined with real-time monitoring of density and temperature, the control of the redox potential provides a new approach to influencing cell metabolism during growth, cell viability and non-growing yeast activity in wine fermentations. Prior research indicates that the problem of sluggish and incomplete fermentation can be alleviated by maintaining a constant redox potential during the ethanol fermentation. A secondary trait of hydrogen sulfide formation from elemental sulfur also seems to be associated with the development of low redox potentials during fermentation and this might be prevented by the deliberate control of redox potentials in a certain range. While the control of the redox potential during wine fermentations has been demonstrated previously at the research scale (100 L), the ability to control it in larger volumes typically seen in commercial conditions remained unanswered. Wine fermentations from the same load of Cabernet Sauvignon grapes from the 2021 harvest were conducted at three volumes: 100 L and 1500 L in a research winery and 10,000 L in a commercial winery. Using only pulses of air delivery, the redox potential was successfully controlled to −40 mV referenced to a silver/silver chloride electrode throughout the fermentations, at all scales. This appears to be the first published result of a controlled fermentation trial that includes the commercial scale and demonstrates the scalability of control of redox potential in wine fermentations.
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Iciek J, Ludwicki M, Błaszczyk I. Continuous Control of Microbiological Contamination of Juice in a Sugar
Extractor. RECENT ADVANCES IN FOOD, NUTRITION & AGRICULTURE 2022; 14:RAFNA-EPUB-123187. [PMID: 36545711 DOI: 10.2174/2772574x13666220509005250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 02/01/2022] [Accepted: 03/11/2022] [Indexed: 06/17/2023]
Abstract
The paper discusses the causes and needs of controlling the level of microbiological contamination of juice in a vertical extractor and the methods to control the level of contamination. The requirements and possibilities for controlling the microbiological contamination level of juice extracted from the vertical extractor are described using redox potential value measurement. Aerating the extractor in a controlled manner, regulating the pH level of the juice, and implementing one of the presented proposals on how to record the measurement results will automatically regulate microbiological contamination levels of the juice in the tower extractor.
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Affiliation(s)
- Jan Iciek
- Department of Sugar Industry and Food Safety Management, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Lodz, Poland
| | - Marek Ludwicki
- Department of Sugar Industry and Food Safety Management, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Lodz, Poland
| | - Ilona Błaszczyk
- Department of Sugar Industry and Food Safety Management, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Lodz, Poland
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Hu H, Wang H, Yang Y, Xu JF, Zhang X. A Bacteria-Responsive Porphyrin for Adaptable Photodynamic/Photothermal Therapy. Angew Chem Int Ed Engl 2022; 61:e202200799. [PMID: 35332634 DOI: 10.1002/anie.202200799] [Citation(s) in RCA: 32] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Indexed: 12/17/2022]
Abstract
We report a cationic porphyrin 5,10,15,20-tetrakis-(4-N-methylpyridyl)-porphyrin (TMPyP) that can respond to specific bacteria, followed by adaptable photodynamic/photothermal therapy processes. TMPyP could be reduced to phlorin by facultative anaerobes with a strong reducing ability such as E. coli and S. typhimurium in hypoxic environments, possessing strong NIR absorption and remarkable photothermal conversion capacity, thus demonstrating excellent antimicrobial activity (>99 %) by photothermal therapy. While in an aerobic environment with aerobic bacteria, TMPyP functioned as a typical photosensitizer that killed bacteria effectively (>99.9 %) by photodynamic therapy. By forming a host-guest complex with cucurbit[7]uril, the biocompatibility of TMPyP significantly improved. This kind of bacteria-responsive porphyrin shows specificity and adaptivity in antimicrobial treatment and holds potential in non-invasive treatments of bacterial infections.
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Affiliation(s)
- Hao Hu
- Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Hua Wang
- Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Yuchong Yang
- Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Jiang-Fei Xu
- Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Xi Zhang
- Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China
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Hu H, Wang H, Yang Y, Xu J, Zhang X. A Bacteria‐Responsive Porphyrin for Adaptable Photodynamic/Photothermal Therapy. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hao Hu
- Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Hua Wang
- Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Yuchong Yang
- Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Jiang‐Fei Xu
- Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
| | - Xi Zhang
- Key Lab of Organic Optoelectronics & Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China
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Espinoza-Vergara J, Molina P, Walter M, Gulppi M, Vejar N, Melo F, Urzua M, Muñoz H, Zagal JH, Zhou X, Azocar MI, Paez MA. Effect of pH on the Electrochemical Behavior of Hydrogen Peroxide in the Presence of Pseudomonas aeruginosa. Front Bioeng Biotechnol 2021; 9:749057. [PMID: 34938720 PMCID: PMC8685425 DOI: 10.3389/fbioe.2021.749057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 11/10/2021] [Indexed: 11/13/2022] Open
Abstract
The influence of pH on the electrochemical behavior of hydrogen peroxide in the presence of Pseudomonas aeruginosa was investigated using electrochemical techniques. Cyclic and square wave voltammetry were used to monitor the enzymatic activity. A modified cobalt phthalocyanine (CoPc) carbon electrode (OPG), a known catalyst for reducing O2 to H2O2, was used to detect species resulting from the enzyme activity. The electrolyte was a sterilized aqueous medium containing Mueller-Hinton (MH) broth. The open-circuit potential (OCP) of the Pseudomonas aeruginosa culture in MH decreased rapidly with time, reaching a stable state after 4 h. Peculiarities in the E / I response were observed in voltammograms conducted in less than 4 h of exposure to the culture medium. Such particular E/I responses are due to the catalase's enzymatic action related to the conversion of hydrogen peroxide to oxygen, confirming the authors' previous findings related to the behavior of other catalase-positive microorganisms. The enzymatic activity exhibits maximum activity at pH 7.5, assessed by the potential at which oxygen is reduced to hydrogen peroxide. At higher or lower pHs, the oxygen reduction reaction (ORR) occurs at higher overpotentials, i.e., at more negative potentials. In addition, and to assess the influence of bacterial adhesion on the electrochemical behavior, measurements of the bacterial-substrate metal interaction were performed at different pH using atomic force microscopy.
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Affiliation(s)
- Javier Espinoza-Vergara
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile.,Corrosion and Protection Center, Department of Materials, University of Manchester, Manchester, England, United Kingdom
| | - Paulo Molina
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Mariana Walter
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Miguel Gulppi
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Nelson Vejar
- Chilean Air Force, Aerospace Sciences Research and Development Centre (CIDCA), San Bernardo, Santiago, Chile
| | - Francisco Melo
- Departamento de Física, Facultad de Ciencias, Universidad de Santiago de Santiago de Chile, Avenida Ecuador, Santiago, Chile
| | - Marcela Urzua
- Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Hugo Muñoz
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - José H Zagal
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Xiaorong Zhou
- Corrosion and Protection Center, Department of Materials, University of Manchester, Manchester, England, United Kingdom
| | - Manuel I Azocar
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Maritza A Paez
- Departamento de Química de Los Materiales, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
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Walker GA, Nelson J, Halligan T, Lima MMM, Knoesen A, Runnebaum RC. Monitoring Site-Specific Fermentation Outcomes via Oxidation Reduction Potential and UV-Vis Spectroscopy to Characterize "Hidden" Parameters of Pinot Noir Wine Fermentations. Molecules 2021; 26:4748. [PMID: 34443337 PMCID: PMC8400154 DOI: 10.3390/molecules26164748] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 07/16/2021] [Accepted: 07/26/2021] [Indexed: 11/17/2022] Open
Abstract
Real-time process metrics are standard for the majority of fermentation-based industries but have not been widely adopted by the wine industry. In this study, replicate fermentations were conducted with temperature as the main process parameter and assessed via in-line Oxidation Reduction Potential (ORP) probes and at-line profiling of phenolics compounds by UV-Vis spectroscopy. The California and Oregon vineyards used in this study displayed consistent vinification outcomes over five vintages and are representative of sites producing faster- and slower-fermenting musts. The selected sites have been previously characterized by fermentation kinetics, elemental profile, phenolics, and sensory analysis. ORP probes were integrated into individual fermentors to record how ORP changed throughout the fermentation process. The ORP profiles generally followed expected trends with deviations revealing previously undetectable process differences between sites and replicates. Site-specific differences were also observed in phenolic and anthocyanin extraction. Elemental composition was also analyzed for each vineyard, revealing distinctive profiles that correlated with the fermentation kinetics and may influence the redox status of these wines. The rapid ORP responses observed related to winemaking decisions and yeast activity suggest ORP is a useful process parameter that should be tracked in addition to Brix, temperature, and phenolics extraction for monitoring fermentations.
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Affiliation(s)
- Gordon A. Walker
- Department of Viticulture & Enology, University of California, Davis, CA 95616, USA; (G.A.W.); (M.M.M.L.)
| | - James Nelson
- Department of Electrical and Computer Engineering, University of California, Davis, CA 95616, USA; (J.N.); (A.K.)
| | - Thomas Halligan
- Department of Chemical Engineering, University of California, Davis, CA 95616, USA;
| | - Maisa M. M. Lima
- Department of Viticulture & Enology, University of California, Davis, CA 95616, USA; (G.A.W.); (M.M.M.L.)
| | - Andre Knoesen
- Department of Electrical and Computer Engineering, University of California, Davis, CA 95616, USA; (J.N.); (A.K.)
| | - Ron C. Runnebaum
- Department of Viticulture & Enology, University of California, Davis, CA 95616, USA; (G.A.W.); (M.M.M.L.)
- Department of Chemical Engineering, University of California, Davis, CA 95616, USA;
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10
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Nothling MD, Cao H, McKenzie TG, Hocking DM, Strugnell RA, Qiao GG. Bacterial Redox Potential Powers Controlled Radical Polymerization. J Am Chem Soc 2021; 143:286-293. [PMID: 33373526 DOI: 10.1021/jacs.0c10673] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Microbes employ a remarkably intricate electron transport system to extract energy from the environment. The respiratory cascade of bacteria culminates in the terminal transfer of electrons onto higher redox potential acceptors in the extracellular space. This general and inducible mechanism of electron efflux during normal bacterial proliferation leads to a characteristic fall in bulk redox potential (Eh), the degree of which is dependent on growth phase, the microbial taxa, and their physiology. Here, we show that the general reducing power of bacteria can be subverted to induce the abiotic production of a carbon-centered radical species for targeted bioorthogonal molecular synthesis. Using two species, Escherichia coli and Salmonella enterica serovar Typhimurium as model microbes, a common redox active aryldiazonium salt is employed to intervene in the terminal respiratory electron flow, affording radical production that is mediated by native redox-active molecular shuttles and active bacterial metabolism. The aryl radicals are harnessed to initiate and sustain a bioorthogonal controlled radical polymerization via reversible addition-fragmentation chain transfer (BacRAFT), yielding a synthetic extracellular matrix of "living" vinyl polymers with predetermined molecular weight and low dispersity. The ability to interface the ubiquitous reducing power of bacteria into synthetic materials design offers a new means for creating engineered living materials with promising adaptive and self-regenerative capabilities.
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Affiliation(s)
- Mitchell D Nothling
- Department of Chemical Engineering, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Hanwei Cao
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia
| | - Thomas G McKenzie
- Department of Chemical Engineering, University of Melbourne, Melbourne, VIC 3010, Australia
| | - Dianna M Hocking
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia
| | - Richard A Strugnell
- Department of Microbiology and Immunology, University of Melbourne at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC 3000, Australia
| | - Greg G Qiao
- Department of Chemical Engineering, University of Melbourne, Melbourne, VIC 3010, Australia
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Tőzsér D, Szakmár K, Szima R, Erdősi O, Szili Z, Laczay P. Presence of Campylobacter and Salmonella spp. in poultry and environmental samples from farm to retail in Hungary. ACTA ALIMENTARIA 2019. [DOI: 10.1556/066.2019.48.4.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- D. Tőzsér
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
| | - K. Szakmár
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
| | - R. Szima
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
| | - O. Erdősi
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
| | - Zs. Szili
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
| | - P. Laczay
- Department of Food Hygiene, University of Veterinary Medicine, H-1078 Budapest, István u. 2. Hungary
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Gulppi M, Muñoz L, Vejar N, Blamey JM, Gonzalez E, Azócar M, Sancy M, Molina P, Zagal JH, Paez M. Electrochemical dynamic sensing of hydrogen peroxide in the presence of microorganisms. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.03.076] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Metabolic fingerprints of Serratia liquefaciens under simulated Martian conditions using Biolog GN2 microarrays. Sci Rep 2018; 8:15721. [PMID: 30356072 PMCID: PMC6200771 DOI: 10.1038/s41598-018-33856-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 10/07/2018] [Indexed: 01/28/2023] Open
Abstract
Microorganisms growing at atmospheric pressures of 0.7 kPa may have a significant impact on the search for life on Mars. Data on their nutrient requirements in a simulated Martian environment are required to ascertain both the potential risk of forward contamination and the potential of past or present habitability of Mars. Serratia liquefaciens can grow at concomitant conditions of low pressure, low temperature, and anoxic atmosphere. Changes in the metabolic fingerprint of S. liquefaciens grown under varying physical conditions including diverse atmospheric pressures (0.7 kPa to 101.3 kPa), temperatures (30 °C or 0 °C), and atmospheric gas compositions (Earth or CO2) were investigated using Biolog GN2 assays. Distinct patterns for each condition were observed. Above 10 kPa S. liquefaciens performed similar to Earth-normal pressure conditions (101.3 kPa) whereas below 10 kPa shifts in metabolic patterns were observed. The differences indicated a physiological alteration in which S. liquefaciens lost its ability to metabolize the majority of the provided carbon sources at 0.7 kPa with a significant decrease in the oxidation of amino acids. By measuring the physiological responses to different carbon sources we were able to identify nutritional constraints that support cellular replication under simulated shallow Mars subsurface conditions.
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Illés CB, Tóth AJ, Dunay A, Lehota J, Bittsánszky A. Evaluation of food safety knowledge and microbial status of food contact surfaces in schools. J Food Saf 2018. [DOI: 10.1111/jfs.12480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Csaba Bálint Illés
- Department of Business Economics and Management; Szent István University; Gödöllő Hungary
| | - András J. Tóth
- Department of Business Economics and Management; Szent István University; Gödöllő Hungary
- InDeRe Institute for Food System Research and Innovation Nonprofit Ltd, Budapest; Hungary
| | - Anna Dunay
- Department of Business Economics and Management; Szent István University; Gödöllő Hungary
| | - József Lehota
- Department of Business Economics and Management; Szent István University; Gödöllő Hungary
| | - András Bittsánszky
- InDeRe Institute for Food System Research and Innovation Nonprofit Ltd, Budapest; Hungary
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15
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Combined effect of NaCl and low temperature on antilisterial bacteriocin production of Lactobacillus plantarum ST202Ch. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2017.10.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Everard CD, Kim MS, Cho H, O’Donnell CP. Hyperspectral fluorescence imaging using violet LEDs as excitation sources for fecal matter contaminate identification on spinach leaves. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2015. [DOI: 10.1007/s11694-015-9276-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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17
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He HJ, Sun DW. Inspection of harmful microbial contamination occurred in edible salmon flesh using imaging technology. J FOOD ENG 2015. [DOI: 10.1016/j.jfoodeng.2014.10.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Hunting ER, Vijver MG, van der Geest HG, Mulder C, Kraak MHS, Breure AM, Admiraal W. Resource niche overlap promotes stability of bacterial community metabolism in experimental microcosms. Front Microbiol 2015; 6:105. [PMID: 25759686 PMCID: PMC4338809 DOI: 10.3389/fmicb.2015.00105] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Accepted: 01/27/2015] [Indexed: 01/01/2023] Open
Abstract
Decomposition of organic matter is an important ecosystem process governed in part by bacteria. The process of decomposition is expected to benefit from interspecific bacterial interactions such as resource partitioning and facilitation. However, the relative importance of resource niche breadth (metabolic diversity) and resource niche overlap (functional redundancy) on decomposition and the temporal stability of ecosystem processes received little scientific attention. Therefore, this study aims to evaluate the effect of an increase in bacterial community resemblance on both decomposition and the stability of bacterial metabolism in aquatic sediments. To this end, we performed laboratory microcosm experiments in which we examined the influence of bacterial consortia differing in number and composition of species on bacterial activity (Electron Transport System Activity, ETSA), dissolved organic carbon production and wavelet transformed measurements of redox potential (Eh). Single substrate affinities of the individual bacterial species were determined in order to calculate the metabolic diversity of the microbial community. Results presented here indicate that bacterial activity and organic matter decomposition increase with widening of the resource niche breadth, and that metabolic stability increases with increasing overlap in bacterial resource niches, hinting that resource niche overlap can promote the stability of bacterial community metabolism.
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Affiliation(s)
- Ellard R Hunting
- Department of Conservation Biology, Institute of Environmental Sciences (CML), Leiden University Leiden, Netherlands
| | - Martina G Vijver
- Department of Conservation Biology, Institute of Environmental Sciences (CML), Leiden University Leiden, Netherlands
| | - Harm G van der Geest
- Department of Aquatic Ecology and Ecotoxicology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam Amsterdam, Netherlands
| | - Christian Mulder
- National Institute for Public Health and the Environment (RIVM-LER) - Centre for Sustainability, Environment and Health Bilthoven, Netherlands
| | - Michiel H S Kraak
- Department of Aquatic Ecology and Ecotoxicology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam Amsterdam, Netherlands
| | - Anton M Breure
- National Institute for Public Health and the Environment (RIVM-LER) - Centre for Sustainability, Environment and Health Bilthoven, Netherlands ; Department of Environmental Science, Institute for Water and Wetland Research, Radboud University Nijmegen, Netherlands
| | - Wim Admiraal
- Department of Aquatic Ecology and Ecotoxicology, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam Amsterdam, Netherlands
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Iciek J, Ludwicki M, Chmal-Fudali E. Control of microbial contamination of juice in a tower extractor by measuring redox potential. SUGAR INDUSTRY 2015. [DOI: 10.36961/si16359] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The paper presents a possibility of controlling the level of microbiological contamination of juice in a tower extractor system by means of redox potential measurement using the sensor and transducer designed by the authors. The study was conducted during the 2013/14 sugar beet campaign. The type and level of microbial contamination and at the same time the value of electromotive force (EMF), pH value and temperature was measured in the juice collected from half the height of the tower extractor. The determination of measurement characteristics of the sensor and transducer and also the microbiological methodology are described. The advantages and disadvantages of using pH value or redox potential measurement to control microbiological contamination of juice in the tower extractor are characterized.
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Erdősi O, Szakmár K, Reichart O, Szili Z, László N, Balogh Z, Székely Körmöczy P, Laczay P. Rapid detection ofSalmonellain food by redox-potential measurement based method combined with real-time PCR. ACTA ALIMENTARIA 2014. [DOI: 10.1556/aalim.43.2014.4.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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Erdősi O, Szakmár K, Reichart O, Szili Z, László N, Székely Körmöczy P, Laczay P. Rapid detection of Listeria monocytogenes in raw milk and soft cheese by a redox potential measurement based method combined with real-time PCR. Acta Vet Hung 2014; 62:304-16. [PMID: 25038948 DOI: 10.1556/avet.2014.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The incidence of outbreaks of foodborne listeriosis has indicated the need for a reliable and rapid detection of the microbe in different foodstuffs. A method combining redox potential measurement and real-time polymerase chain reaction (PCR) was developed to detect Listeria monocytogenes in artificially contaminated raw milk and soft cheese. Food samples of 25 g or 25 ml were homogenised in 225 ml of Listeria Enrichment Broth (LEB) with Oxford supplement, and the redox potential measurement technique was applied. For Listeria species the measuring time was maximum 34 h. The absence of L. monocytogenes could reliably be proven by the redox potential measurement method, but Listeria innocua and Bacillus subtilis could not be differentiated from L. monocytogenes on the basis of the redox curves. The presence of L. monocytogenes had to be confirmed by real-time PCR. The combination of these two methods proved to detect < 10 cfu/g of L. monocytogenes in a cost- and time-effective manner. This method can potentially be used as an alternative to the standard nutrient method for the rapid detection of L. monocytogenes in food.
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Affiliation(s)
- Orsolya Erdősi
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Katalin Szakmár
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Olivér Reichart
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Zsuzsanna Szili
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Noémi László
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Péter Székely Körmöczy
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
| | - Péter Laczay
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science István u. 2 H-1078 Budapest Hungary
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22
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Szakmár K, Reichart O, Szatmári I, Erdősi O, Szili Z, László N, Székely Körmöczy P, Laczay P. In vitro study on the effect of doxycycline on the microbial activity of soil determined by redox-potential measuring system. Acta Microbiol Immunol Hung 2014; 61:317-28. [PMID: 25261944 DOI: 10.1556/amicr.61.2014.3.6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The potential effect of doxycycline on the microbial activity was investigated in three types of soil. Soil samples were spiked with doxycycline, incubated at 25°C and tested at 0, 2, 4 and 6 days after treatment. The microbiological activity of the soil was characterized by the viable count determined by plate pouring and by the time necessary to reach a defined rate of the redox-potential decrease termed as time to detection (TTD).The viable count of the samples was not changed during the storage. The TTD values, however exhibited a significant increase in the 0.2-1.6 mg/kg doxycycline concentration range compared to the untreated samples indicating concentration-dependent inhibitory effect on microbial activity. The potency of the effect was different in the 3 soil types. To describe the combined effect of the doxycycline concentration and time on the biological activity of one type of soil a mathematical model was constructed and applied.The change of microbial metabolic rate could be measured also without (detectable) change of microbial count when the traditional microbiological methods are not applicable. The applied new redox potential measurement-based method is a simple and useful procedure for the examination of microbial activity of soil and its potential inhibition by antibiotics.
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Affiliation(s)
- Katalin Szakmár
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | - Olivér Reichart
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | | | - Orsolya Erdősi
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | - Zsuzsanna Szili
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | - Noémi László
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | - Péter Székely Körmöczy
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
| | - Péter Laczay
- 1 Szent István University Department of Food Hygiene, Faculty of Veterinary Science Budapest Hungary
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Wang J, Wu C, Zhou J, Cai H, Liu Q, Wang P. A photovoltage-based integrated sensor for extracellular redox potential measurement and acidification detection. CHINESE SCIENCE BULLETIN-CHINESE 2014. [DOI: 10.1007/s11434-014-0178-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Capuani A, Behr J, Vogel RF. Influence of lactic acid bacteria on the oxidation–reduction potential of buckwheat (Fagopyrum esculentum Moench) sourdoughs. Eur Food Res Technol 2012. [DOI: 10.1007/s00217-012-1834-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Microfabricated electrochemical cell-based biosensors for analysis of living cells in vitro. BIOSENSORS-BASEL 2012; 2:127-70. [PMID: 25585708 PMCID: PMC4263572 DOI: 10.3390/bios2020127] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/02/2012] [Accepted: 04/19/2012] [Indexed: 01/03/2023]
Abstract
Cellular biochemical parameters can be used to reveal the physiological and functional information of various cells. Due to demonstrated high accuracy and non-invasiveness, electrochemical detection methods have been used for cell-based investigation. When combined with improved biosensor design and advanced measurement systems, the on-line biochemical analysis of living cells in vitro has been applied for biological mechanism study, drug screening and even environmental monitoring. In recent decades, new types of miniaturized electrochemical biosensor are emerging with the development of microfabrication technology. This review aims to give an overview of the microfabricated electrochemical cell-based biosensors, such as microelectrode arrays (MEA), the electric cell-substrate impedance sensing (ECIS) technique, and the light addressable potentiometric sensor (LAPS). The details in their working principles, measurement systems, and applications in cell monitoring are covered. Driven by the need for high throughput and multi-parameter detection proposed by biomedicine, the development trends of electrochemical cell-based biosensors are also introduced, including newly developed integrated biosensors, and the application of nanotechnology and microfluidic technology.
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Erdősi O, Szakmár K, Reichart O, Székely-Körmöczy P, Laczay P. Application of the redox potential measurementbased rapid method in the microbial hygienic control. ACTA ALIMENTARIA 2012. [DOI: 10.1556/aalim.2011.0005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Ignatova M, Prévost H, Leguerinel I, Guillou S. Growth and reducing capacity of Listeria monocytogenes under different initial redox potential. J Appl Microbiol 2010; 108:256-65. [DOI: 10.1111/j.1365-2672.2009.04426.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Yin YG, Ding Y. A close to real-time prediction method of total coliform bacteria in foods based on image identification technology and artificial neural network. Food Res Int 2009. [DOI: 10.1016/j.foodres.2008.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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