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Enhanced removal of phenolic compounds via irreversible sorption using manganese oxides immobilized on oxidized humin. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
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Hu T, Pham DM, Kasai T, Katayama A. The Emergence of Extracellular Electron Mediating Functionality in Rice Straw-Artificial Soil Mixture during Humification. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:15173. [PMID: 36429897 PMCID: PMC9691237 DOI: 10.3390/ijerph192215173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/14/2022] [Accepted: 11/15/2022] [Indexed: 06/16/2023]
Abstract
This study aimed to elucidate the origin of extracellular electron mediating (EEM) functionality and redox-active center(s) in humic substances, where they are ubiquitously distributed. Here, we show the emergence of EEM functionality during the humification of rice straw in artificial soil (kaolin and sand) with a matric potential of -100 cm at 20 °C for one year. We used the dechlorination activity of an EEM material-dependent pentachlorophenol-dechlorinating anaerobic microbial consortium as an index of the EEM functionality. Although rice straw and its mixture with artificial soil did not initially have EEM functionality, it emerged after one month of humification and increased until six months after which the functionality was maintained for one year. Chemical and electrochemical characterizations demonstrated that the emergence and increase in EEM functionality were correlated with the degradation of rice straw, formation of quinone structures, a decrease in aromatic structures, an increase in nitrogenous and aliphatic structures, and specific electric capacitance during humification. The newly formed quinone structure was suggested as a potential redox-active center for the EEM functionality. These findings provide novel insights into the dynamic changes in EEM functionality during the humification of organic materials.
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Affiliation(s)
- Tingting Hu
- Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
| | - Duyen Minh Pham
- Institute of Materials and Systems for Sustainability, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
| | - Takuya Kasai
- Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
| | - Arata Katayama
- Graduate School of Engineering, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Tokai National Higher Education and Research System, Nagoya 464-8603, Japan
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Wu JW, Pei SZ, Zhou CS, Liu BF, Cao GL. Assessment of potential biotoxicity induced by biochar-derived dissolved organic matters to biological fermentative H 2 production. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 838:156072. [PMID: 35598665 DOI: 10.1016/j.scitotenv.2022.156072] [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: 03/10/2022] [Revised: 05/02/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
Biochar is a widely used antecedent for improving bio‑hydrogen production. However, little is known about the impact of biochar-derived dissolved organic matter (DOM) on the performance of fermentative bio-H2 production. Herein, we evaluated the impact of biochar-derived DOM on the fermentation performance of hydrogen-producing microflora. The pyrolysis temperature of biochar affected the DOM composition, with lower pyrolysis temperatures showing more serious inhibition on H2 accumulation. When biochar was pyrolyzed at 500 °C, DOM prolonged the fermentation period and decreased H2 production from 1330.41 mL L-1 to 1177.05 mL L-1 compared to the control group. The xylose utilization in mixed substrate decreased from 29.72% to 26.41%, which is not favorable for practical applications where lignocellulosic biomass is used as a substrate. Otherwise, DOM caused a 6% reduction in microbial biomass accumulation and less soluble metabolites formation. The potential mechanism of DOM inhibiting bio‑hydrogen production was verified by identifying an increase in reactive oxygen species (ROS) level (178.2%) and the microbial community shifted to containing fewer hydrogen-producing strains. The finding prompts a more precise design of biochar applications in fermentation systems to alleviate the potential hazards and maximum the fermentation performance, not limited to fermentative hydrogen production system.
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Affiliation(s)
- Ji-Wen Wu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shu-Zhao Pei
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Chun-Shuang Zhou
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Bing-Feng Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Guang-Li Cao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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Dey S, Kasai T, Katayama A. Promotion of Nitrogen Fixation of Diverse Heterotrophs by Solid-Phase Humin. Front Microbiol 2022; 13:853411. [PMID: 35992702 PMCID: PMC9389315 DOI: 10.3389/fmicb.2022.853411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/23/2022] [Indexed: 11/25/2022] Open
Abstract
Although biological nitrogen fixation (BNF) proceeds under mild conditions compared to the energy-intensive Haber–Bosch process, the slow kinetics of BNF necessitate the promotion of BNF activity in its practical application. The BNF promotion using purified nitrogenases and using genetically modified microorganisms has been studied, but these enzymes are unstable and expensive; moreover, designing genetically modified microorganisms is also a difficult task. Alternatively, the BNF promotion in non-modified (wild-type) microorganisms (enriched consortia) with humin has been shown, which is a humic substance insoluble at any pH and functions as an extracellular electron mediator. However, the taxonomic distribution of the diazotrophs promoted by humin, the levels of BNF promotion, and the underlying mechanism in BNF promotion with humin remain unknown. In this study, we show that taxonomically diverse heterotrophic diazotrophs, harboring nifH clusters I, II, and III, promoted their BNF by accepting extracellular electrons from humin, based on the characterization of the individual responses of isolated diazotrophs to humin. The reduced humin increased the acetylene reduction activity of the diazotrophs by 194–916% compared to the level achieved by the organic carbon source, causing adenosine triphosphate (ATP) synthesis in the diazotroph cells without increase in the CO2 production and direct electron donation to the MoFe protein of the nitrogenase in the cells without relying on the biological electron transfer system. These would result in BNF promotion in the wild-type diazotroph cells beyond their biochemical capacity. This significant promotion of BNF with humin would serve as a potential basis for sustainable technology for greener nitrogen fixation.
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Affiliation(s)
- Sujan Dey
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
| | - Takuya Kasai
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
| | - Arata Katayama
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
- *Correspondence: Arata Katayama
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Ha BN, Pham DM, Kasai T, Awata T, Katayama A. Effect of Humin and Chemical Factors on CO 2-Fixing Acetogenesis and Methanogenesis. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19052546. [PMID: 35270239 PMCID: PMC8909181 DOI: 10.3390/ijerph19052546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/17/2022] [Accepted: 02/18/2022] [Indexed: 02/04/2023]
Abstract
Acetogenesis and methanogenesis have attracted attention as CO2-fixing reactions. Humin, a humic substance insoluble at any pH, has been found to assist CO2-fixing acetogenesis as the sole electron donor. Here, using two CO2-fixing consortia with acetogenic and methanogenic activities, the effect of various parameters on these activities was examined. One consortium utilized humin and hydrogen (H2) as electron donors for acetogenesis, either separately or simultaneously, but with a preference for the electron use from humin. The acetogenic activity was accelerated 14 times by FeS at 0.2 g/L as the optimal concentration, while being inhibited by MgSO4 at concentration above 0.02 g/L and by NaCl at concentrations higher than 6 g/L. Another consortium did not utilize humin but H2 as electron donor, suggesting that humin was not a universal electron donor for acetogenesis. For methanogenesis, both consortia did not utilize extracellular electrons from humin unless H2 was present. The methanogenesis was promoted by FeS at 0.2 g/L or higher concentrations, especially without humin, and with NaCl at 2 g/L or higher concentrations regardless of the presence of humin, while no significant effect was observed with MgSO4. Comparative sequence analysis of partial 16S rRNA genes suggested that minor groups were the humin-utilizing acetogens in the consortium dominated by Clostridia, while Methanobacterium was the methanogen utilizing humin with H2.
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Affiliation(s)
- Biec Nhu Ha
- Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan; (B.N.H.); (T.K.)
| | - Duyen Minh Pham
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa, Nagoya 464-8603, Japan;
| | - Takuya Kasai
- Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan; (B.N.H.); (T.K.)
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa, Nagoya 464-8603, Japan;
| | - Takanori Awata
- Graduate School of Engineering, Osaka Institute of Technology, Osaka 535-8585, Japan;
| | - Arata Katayama
- Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Chikusa, Nagoya 464-8603, Japan; (B.N.H.); (T.K.)
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa, Nagoya 464-8603, Japan;
- Correspondence: ; Tel.: +81-52-789-5856
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Pham DM, Dey S, Katayama A. Activation of extracellular electron network in non-electroactive bacteria by Bombyx mori silk. Int J Biol Macromol 2022; 195:1-11. [PMID: 34871655 DOI: 10.1016/j.ijbiomac.2021.11.190] [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: 08/25/2021] [Revised: 11/18/2021] [Accepted: 11/27/2021] [Indexed: 11/05/2022]
Abstract
Extracellular electron transfer material (EETM) has increasingly attracted attentions for the enhancing effect on multiple microbial reactions. Especially, EETM is known to be essential to activate the energy network in non-electroactive bacteria. It is motivated to find out an EETM which is natural-based, environmentally friendly, and easily produced at large-scale. In this study, Bombyx mori silk is found, for the first time, to function as an EETM by using an EETM-dependent pentachlorophenol (PCP) dechlorinating anaerobic microbial culture. Subsequently, by dividing fibroin fiber into different soluble/insoluble fractions and correlating their EET functions with their structural properties based on various spectroscopic analyses, the β-sheet configuration is suggested as an essential structure supporting the EET function of silk materials. The analyses also suggested the involvement of sulfur-containing amino acids in this function. The EET function is not degraded by boiling or acid/alkaline treatments and the material can be utilized multiple times, although it is susceptible to UV irradiation. Bombyx mori silk also enhance other microbial reactions, including Fe(III)OOH reduction, CO2 reduction to acetate, and nitrogen fixation. This discovery provides a basis for developing biotechnology for environmental remediation, global warming reduction, and biofertilizer production using Bombyx mori silk and its wastes.
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Affiliation(s)
- Duyen M Pham
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan.
| | - Sujan Dey
- Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Arata Katayama
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8603, Japan; Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan.
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Pham DM, Kasai T, Yamaura M, Katayama A. Humin: No longer inactive natural organic matter. CHEMOSPHERE 2021; 269:128697. [PMID: 33139048 DOI: 10.1016/j.chemosphere.2020.128697] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 10/18/2020] [Accepted: 10/19/2020] [Indexed: 06/11/2023]
Abstract
The discovery of the function of humin (HM), an insoluble fraction of humic substances (HSs), as an extracellular electron mediator (EEM) in 2012 has provided insight into the role of HM in nature and its potential for in situ bioremediation of pollutants. The EEM function is thought to enable the energy network of various microorganisms using HM. Recently, a number of studies on the application of HM as EEM in anaerobic microbial cultures have been conducted. Even so, there is a need for developing a holistic view of HM EEM function. In this paper, we summarize all the available information on the properties of HM EEM function, its applications, possible redox-active structures, and the interaction between HM and microbial cells. We also suggest scopes for future HM research.
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Affiliation(s)
- Duyen Minh Pham
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8603, Japan
| | - Takuya Kasai
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8603, Japan; Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
| | - Mirai Yamaura
- Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
| | - Arata Katayama
- Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8603, Japan; Department of Civil Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan.
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Dey S, Awata T, Mitsushita J, Zhang D, Kasai T, Matsuura N, Katayama A. Promotion of biological nitrogen fixation activity of an anaerobic consortium using humin as an extracellular electron mediator. Sci Rep 2021; 11:6567. [PMID: 33753787 PMCID: PMC7985497 DOI: 10.1038/s41598-021-85955-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 03/05/2021] [Indexed: 11/09/2022] Open
Abstract
Nitrogen fertiliser is manufactured using the industrial Haber–Bosch process, although it is extremely energy-consuming. One sustainable alternative technology is the electrochemical promotion of biological nitrogen fixation (BNF). This study reports the promotion of BNF activity of anaerobic microbial consortia by humin, a solid-phase humic substance, at any pH, functioning as an extracellular electron mediator, to levels of 5.7–11.8 times under nitrogen-deficient conditions. This was evidenced by increased acetylene reduction activity and total nitrogen content of the consortia. Various humins from different origins promoted anaerobic BNF activity, although the degree of promotion differed. The promotion effected by humin differed from the effects of chemical reducing agents and the effects of supplemental micronutrients and vitamins. The promotion of anaerobic BNF activity by only reduced humin without any other electron donor suggested that humin did not serve as organic carbon source but as extracellular electron mediator, for electron donation to the nitrogen-fixing microorganisms. The next generation sequencing (NGS) of partial 16S rRNA genes showed the predominance of Clostridiales (Firmicutes) in the consortia. These findings suggest the effectiveness of humin as a solid-phase extracellular electron mediator for the promotion of anaerobic BNF activity, potentially to serve for the basis for a sustainable technology.
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Affiliation(s)
- Sujan Dey
- Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Takanori Awata
- National Institute for Land and Infrastructure Management, Asahi 1, Tsukuba, Ibaraki, 305-0804, Japan
| | - Jumpei Mitsushita
- Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Dongdong Zhang
- Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan.,Ocean College, Zhejiang University, Zhoushan, 316021, China
| | - Takuya Kasai
- Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan.,Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Norihisa Matsuura
- School of Geosciences and Civil Engineering, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Arata Katayama
- Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan. .,Institute of Materials and Systems for Sustainability, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan.
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