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Song E, Lee K, Kim J. Tetrazolium-Based Visually Indicating Bacteria Sensor for Colorimetric Detection of Point of Contamination. ACS APPLIED MATERIALS & INTERFACES 2022; 14:38153-38161. [PMID: 35946791 PMCID: PMC9415389 DOI: 10.1021/acsami.2c08613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
Protective equipment for detecting bacterial contamination has been in high demand with increasing interest in public health and hygiene. Herein, a fiber-based visually indicating bacteria sensor (VIBS) embedded with iodonitrotetrazolium chloride is developed for the general purpose of detecting live bacteria, and its chromogenic effectiveness is investigated for Gram-negative Escherichia coli and Gram-positive Micrococcus luteus. The developed color intensity is measured by the light absorption coefficient to the scattering coefficient (K/S) based on the Kubelka-Munk equation, and the colorimetric sensitivities of different membranes are examined by calculating the limit of detection (LOD) and the limit of quantification (LOQ). The results demonstrate that the interactions between VIBS and bacteria depend on the wetting properties of membranes. A hydrophobic membrane shows excessive interactions at high concentrations of Gram-negative E. coli bacteria, whose cell membrane is lipophilic. The membrane blended with hydrophobic and hydrophilic polymers displays linear colorimetric responses for both Gram-negative and Gram-positive bacteria strains, demonstrating a reliable sensing capability in the range of the tested bacteria concentration. This study is significant in that explorative experimentations are performed to conceive a proof of concept of a fiber-based bacteria sensor, which is readily applicable in various fields where bacteria pose a threat.
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Affiliation(s)
- Eugene Song
- Department
of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea
| | - Kyeongeun Lee
- Department
of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea
- Reliability
Assessment Center, FITI Testing & Research
Institute, Seoul 07791, Korea
| | - Jooyoun Kim
- Department
of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea
- Research
Institute of Human Ecology, Seoul National
University, Seoul 08826, Korea
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Rajasekharan SK, Paz‐Aviram T, Galili S, Berkovich Z, Reifen R, Shemesh M. Biofilm formation onto starch fibres by Bacillus subtilis governs its successful adaptation to chickpea milk. Microb Biotechnol 2021; 14:1839-1846. [PMID: 33080087 PMCID: PMC8313274 DOI: 10.1111/1751-7915.13665] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/04/2020] [Accepted: 08/23/2020] [Indexed: 11/28/2022] Open
Abstract
Beneficial biofilms may confer effective adaptation to food matrices that assist bacteria in enduring hostile environmental conditions. The matrices, for instance, dietary fibres of various food products, might serve as a natural scaffold for bacterial cells to adhere and grow as biofilms. Here, we report on a unique interaction of Bacillus subtilis cells with the resistant starch fibresof chickpea milk (CPM), herein CPM fibres, along with the production of a reddish-pink pigment. Genetic analysis identified the pigment as pulcherrimin, and also revealed the involvement of Spo0A/SinI pathway in modulating the observed phenotypes. Besides, through successful colonization of the CPM fibres, the wild-type cells of B. subtilis displayed enhanced survivability and resilience to environmental stress, such as heat and in vitro gastrointestinal treatments. In total, we infer that the biofilm formation on CPM fibres is an adaptation response of B. subtilis for strategic survival.
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Affiliation(s)
- Satish Kumar Rajasekharan
- Departmet of Food ScienceInstitute of Postharvvest Technology and Food SciencesAgricultural Research Organization (ARO)The Volcani CenterRishon LeZion7528809Israel
| | - Tali Paz‐Aviram
- Departmet of Food ScienceInstitute of Postharvvest Technology and Food SciencesAgricultural Research Organization (ARO)The Volcani CenterRishon LeZion7528809Israel
| | - Shmuel Galili
- Department of Vegetable and Field CropsInstitute of Plant SciencesAgricultural Research Organization (ARO)The Volcani CenterRishon LeZion7528809Israel
| | - Zipi Berkovich
- Institute of Biochemistry, Food Science and NutritionThe Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Ram Reifen
- Institute of Biochemistry, Food Science and NutritionThe Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
| | - Moshe Shemesh
- Departmet of Food ScienceInstitute of Postharvvest Technology and Food SciencesAgricultural Research Organization (ARO)The Volcani CenterRishon LeZion7528809Israel
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Hemmatian T, Lee H, Kim J. Bacteria Adhesion of Textiles Influenced by Wettability and Pore Characteristics of Fibrous Substrates. Polymers (Basel) 2021; 13:E223. [PMID: 33440678 PMCID: PMC7827894 DOI: 10.3390/polym13020223] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/05/2021] [Accepted: 01/08/2021] [Indexed: 11/16/2022] Open
Abstract
Bacteria adhesion on the surface is an initial step to create biofouling, which may lead to a severe infection of living organisms and humans. This study is concerned with investigating the textile properties including wettability, porosity, total pore volume, and pore size in association with bacteria adhesion. As model bacteria, Gram-negative, rod-shaped Escherichia coli and the Gram-positive, spherical-shaped Staphylococcus aureus were used to analyze the adhesion tendency. Electrospun webs made from polystyrene and poly(lactic acid) were used as substrates, with modification of wettability by the plasma process using either O2 or C4F8 gas. The pore and morphological characteristics of fibrous webs were analyzed by the capillary flow porometer and scanning electron microscopy. The substrate's wettability appeared to be the primary factor influencing the cell adhesion, where the hydrophilic surface resulted in considerably higher adhesion. The pore volume and the pore size, rather than the porosity itself, were other important factors affecting the bacteria adherence and retention. In addition, the compact spatial distribution of fibers limited the cell intrusion into the pores, reducing the total amount of adherence. Thus, superhydrophobic textiles with the reduced total pore volume and smaller pore size would circumvent the adhesion. The findings of this study provide informative discussion on the characteristics of fibrous webs affecting the bacteria adhesion, which can be used as a fundamental design guide of anti-biofouling textiles.
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Affiliation(s)
- Tahmineh Hemmatian
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
| | - Halim Lee
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
| | - Jooyoun Kim
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (T.H.); (H.L.)
- Research Institute of Human Ecology, Seoul National University, Seoul 08826, Korea
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Li S, Sakuntala M, Song YE, Heo JO, Kim M, Lee SY, Kim MS, Oh YK, Kim JR. Photoautotrophic hydrogen production of Rhodobacter sphaeroides in a microbial electrosynthesis cell. BIORESOURCE TECHNOLOGY 2021; 320:124333. [PMID: 33160214 DOI: 10.1016/j.biortech.2020.124333] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 10/23/2020] [Accepted: 10/24/2020] [Indexed: 06/11/2023]
Abstract
Conventional photoheterotrophic H2 production by purple sulfur bacteria requires additional organic substrates as the carbon and energy sources. This study examined the novel photoautotrophic H2 production of Rhodobacter sphaeroides with concomitant CO2 uptake in microbial electrosynthesis (MES). Under an applied potential of -0.9 V vs. Ag/AgCl to the cathode, Rhodobacter sphaeroides produced hydrogen with CO2 as the sole carbon source under illumination. The initial planktonic cells decreased rapidly in suspension, whereas biomass formation on the cathode surface increased gradually during MES operation. The electron and carbon flow under photoautotrophic conditions in MES were estimated. Glutamate, as the nitrogen source, enhanced hydrogen production significantly (328 mL/L/day) compared to NH4Cl (67 mL/L/day) during seven days of operation. The photoautotrophic condition with 6000 lx presented CO2 consumption and simultaneous biomass formation on the cathode electrode. MES-driven electron and proton transfer enabled the simultaneous production of hydrogen and CO2 uptake.
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Affiliation(s)
- Shuwei Li
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Mutyala Sakuntala
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Young Eun Song
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Ji-Ook Heo
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Minsoo Kim
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Soo Youn Lee
- Gwangju Bioenergy R&D Center, Korea Institute of Energy Research (KIER), Gwangju, Republic of Korea
| | - Min-Sik Kim
- Gwangju Bioenergy R&D Center, Korea Institute of Energy Research (KIER), Gwangju, Republic of Korea
| | - You-Kwan Oh
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Jung Rae Kim
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea.
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Jung S, Hemmatian T, Song E, Lee K, Seo D, Yi J, Kim J. Disinfection Treatments of Disposable Respirators Influencing the Bactericidal/Bacteria Removal Efficiency, Filtration Performance, and Structural Integrity. Polymers (Basel) 2020; 13:E45. [PMID: 33374397 PMCID: PMC7796291 DOI: 10.3390/polym13010045] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 12/19/2020] [Accepted: 12/21/2020] [Indexed: 12/31/2022] Open
Abstract
In the outbreak of COVID-19, the extended wear of single-use, disposable respirators was inevitable due to limited supplies. As a respirator is front-line protection against particulate matter, including bioaerosol and droplets, a comprehensive understanding for the reuse strategy is needed. In this study, eight different disinfection methods commonly applied for the reuse of respirators were compared for their influence on the filtration and bactericidal/bacteria removal performance, with in-depth discussion on the cause of effects. Treatments including oven-dry, ultraviolet irradiation (UV), microwaving, laundering with and without detergent, and immersion in hypochlorite, isopropanol, and ethanol were performed to respirators. Immersion in ethanol or isopropanol was effective for inactivation and removal of bacteria, yet such a treatment significantly deteriorated the filtration efficiency in about 20-28%, dissipating the surface charges. Laundering, while effective in removing the attached bacteria, triggered physical damage, leading to a possible reduction of filtration performance. A short-term oven-dry, UV irradiation, and microwaving mostly preserved the filtration performance, yet the drawback lied in the incomplete bactericidal efficiency. This study would contribute to the public health and safety by providing scientific background on the effect of disinfection treatment methods for respirators.
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Affiliation(s)
- Seojin Jung
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
| | - Tahmineh Hemmatian
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
| | - Eugene Song
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
| | - Kyeongeun Lee
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
- Reliability Assessment Center, FITI Testing & Research Institute, Seoul 07791, Korea;
| | - Dongwan Seo
- Reliability Assessment Center, FITI Testing & Research Institute, Seoul 07791, Korea;
| | - Jehyung Yi
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
| | - Jooyoun Kim
- Department of Textiles, Merchandising and Fashion Design, Seoul National University, Seoul 08826, Korea; (S.J.); (T.H.); (E.S.); (K.L.); (J.Y.)
- Research Institute of Human Ecology, Seoul National University, Seoul 08826, Korea
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