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Sharma KK, Panwar H, Gupta KK. Isolation and characterization of bio-prospecting gut strains Bacillus safensis CGK192 and Bacillus australimaris CGK221 for plastic (HDPE) degradation. Biotechnol Lett 2024:10.1007/s10529-024-03486-z. [PMID: 38705964 DOI: 10.1007/s10529-024-03486-z] [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: 05/31/2023] [Revised: 12/20/2023] [Accepted: 03/10/2024] [Indexed: 05/07/2024]
Abstract
The present work reports the application of novel gut strains Bacillus safensis CGK192 (Accession No. OM658336) and Bacillus australimaris CGK221 (Accession No. OM658338) in the biological degradation of synthetic polymer i.e., high-density polyethylene (HDPE). The biodegradation assay based on polymer weight loss was conducted under laboratory conditions for a period of 90 days along with regular evaluation of bacterial biomass in terms of total protein content and viable cells (CFU/cm2). Notably, both strains achieved significant weight reduction for HDPE films without any physical or chemical pretreatment in comparison to control. Hydrophobicity and biosurfactant characterization were also done in order to assess strains ability to form bacterial biofilm over the polymer surface. The post-degradation characterization of HDPE was also performed to confirm degradation using analytical techniques such as Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Field emission scanning electronic microscopy (FE-SEM) coupled with energy dispersive X-ray (EDX), and Gas chromatography-mass spectrometry (GC-MS). Interestingly strain CGK221 was found to be more efficient in forming biofilm over polymer surface as indicated by lower half-life (i.e., 0.00032 day-1) and higher carbonyl index in comparison to strain CGK192. The findings reflect the ability of our strains to develop biofilm and introduce an oxygenic functional group into the polymer surface, thereby making it more susceptible to degradation.
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Affiliation(s)
- Kamal Kant Sharma
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India
| | - Himalaya Panwar
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India
| | - Kartikey Kumar Gupta
- Department of Botany and Microbiology, Gurukula Kangri (Deemed to be University), Haridwar, Uttarakhand, India.
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2
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Yang W, Bu Q, Shi Q, Zhao R, Huang H, Yang L, Tang J, Ma Y. Emerging Contaminants in the Effluent of Wastewater Should Be Regulated: Which and to What Extent? TOXICS 2024; 12:309. [PMID: 38787088 PMCID: PMC11125804 DOI: 10.3390/toxics12050309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/22/2024] [Accepted: 04/22/2024] [Indexed: 05/25/2024]
Abstract
Effluent discharged from urban wastewater treatment plants (WWTPs) is a major source of emerging contaminants (ECs) requiring effective regulation. To this end, we collected discharge datasets of pharmaceuticals (PHACs) and endocrine-disrupting chemicals (EDCs), representing two primary categories of ECs, from Chinese WWTP effluent from 2012 to 2022 to establish an exposure database. Moreover, high-risk ECs' long-term water quality criteria (LWQC) were derived using the species sensitivity distribution (SSD) method. A total of 140 ECs (124 PHACs and 16 EDCs) were identified, with concentrations ranging from N.D. (not detected) to 706 μg/L. Most data were concentrated in coastal regions and Gansu, with high ecological risk observed in Gansu, Hebei, Shandong, Guangdong, and Hong Kong. Using the assessment factor (AF) method, 18 high-risk ECs requiring regulation were identified. However, only three of them, namely carbamazepine, ibuprofen, and bisphenol-A, met the derivation requirements of the SSD method. The LWQC for these three ECs were determined as 96.4, 1010, and 288 ng/L, respectively. Exposure data for carbamazepine and bisphenol-A surpassed their derived LWQC, indicating a need for heightened attention to these contaminants. This study elucidates the occurrence and risks of ECs in Chinese WWTPs and provides theoretical and data foundations for EC management in urban sewage facilities.
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Affiliation(s)
- Weiwei Yang
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China (Q.S.)
| | - Qingwei Bu
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China (Q.S.)
| | - Qianhui Shi
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China (Q.S.)
| | - Ruiqing Zhao
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China (Q.S.)
| | - Haitao Huang
- School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China (Q.S.)
| | - Lei Yang
- State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jianfeng Tang
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Yuning Ma
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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Hu F, Wang P, Li Y, Ling J, Ruan Y, Yu J, Zhang L. Bioremediation of environmental organic pollutants by Pseudomonas aeruginosa: Mechanisms, methods and challenges. ENVIRONMENTAL RESEARCH 2023; 239:117211. [PMID: 37778604 DOI: 10.1016/j.envres.2023.117211] [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: 07/02/2023] [Revised: 09/10/2023] [Accepted: 09/25/2023] [Indexed: 10/03/2023]
Abstract
The development of the chemical industry has led to a boom in daily consumption and convenience, but has also led to the release of large amounts of organic pollutants, such as petroleum hydrocarbons, plastics, pesticides, and dyes. These pollutants are often recalcitrant to degradation in the environment, whereby the most problematic compounds may even lead to carcinogenesis, teratogenesis and mutagenesis in animals and humans after accumulation in the food chain. Microbial degradation of organic pollutants is efficient and environmentally friendly, which is why it is considered an ideal method. Numerous studies have shown that Pseudomonas aeruginosa is a powerful platform for the remediation of environmental pollution with organic chemicals due to its diverse metabolic networks and its ability to secrete biosurfactants to make hydrophobic substrates more bioavailable, thereby facilitating degradation. In this paper, the mechanisms and methods of the bioremediation of environmental organic pollutants (EOPs) by P. aeruginosa are reviewed. The challenges of current studies are highlighted, and new strategies for future research are prospected. Metabolic pathways and critical enzymes must be further deciphered, which is significant for the construction of a bioremediation platform based on this powerful organism.
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Affiliation(s)
- Fanghui Hu
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Jiangsu, Nanjing, 210023, China
| | - Panlin Wang
- School of Bioengineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Yunhan Li
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Jiangsu, Nanjing, 210023, China
| | - Jiahuan Ling
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Jiangsu, Nanjing, 210023, China
| | - Yongqiang Ruan
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Jiangsu, Nanjing, 210023, China
| | - Jiaojiao Yu
- School of Medical Imaging, Tianjin Medical University, Tianjin, 300203, China.
| | - Lihui Zhang
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Jiangsu, Nanjing, 210023, China.
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Howard SA, McCarthy RR. Modulating biofilm can potentiate activity of novel plastic-degrading enzymes. NPJ Biofilms Microbiomes 2023; 9:72. [PMID: 37788986 PMCID: PMC10547765 DOI: 10.1038/s41522-023-00440-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 09/19/2023] [Indexed: 10/05/2023] Open
Abstract
Plastic pollution is an increasing global issue desperately requiring a solution. Only 9% of all plastic waste has been recycled, and whilst recycling gives a second life to plastic, it is costly and there are limited downstream uses of recycled plastic, therefore an alternative is urgently needed. Biodegradation of plastic by microorganisms is a developing field of interest with the potential for bioreactors to be used alongside recycling to degrade plastic that may otherwise be sent to landfill. Here, we have identified two novel polyethylene terephthalate (PET) degrading enzymes through genomic mining and characterised their activity, including their ability to degrade PET. One of the main roadblocks facing the development of microbial enzymes as a plastic biodegradation solution, is that their efficiency is too low to facilitate development as bioremediation tools. In an innovative approach to tackle this roadblock, we hypothesised that enhancing a bacteria's ability to attach to and form a biofilm on plastic could maximise the local concentration of the enzyme around the target substrate, therefore increasing the overall rate of plastic degradation. We found that increasing biofilm levels, by manipulating the levels of the second messenger, Cyclic-di-GMP, led to increased levels of polyester degradation in cells expressing novel and well characterised polyester-degrading enzymes. This indicates that modulating biofilm formation is a viable mechanism to fast track the development of bacterial plastic bioremediation solutions.
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Affiliation(s)
- Sophie A Howard
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, UB8 3PH, UK
| | - Ronan R McCarthy
- Division of Biosciences, Department of Life Sciences, College of Health and Life Sciences, Brunel University London, Uxbridge, UB8 3PH, UK.
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Czarny-Krzymińska K, Krawczyk B, Szczukocki D. Bisphenol A and its substitutes in the aquatic environment: Occurrence and toxicity assessment. CHEMOSPHERE 2023; 315:137763. [PMID: 36623601 DOI: 10.1016/j.chemosphere.2023.137763] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Bisphenol A is classified as a high production volume chemical commonly used in the manufacture of polycarbonate plastics, epoxy resins and thermal paper. The endocrine disrupting properties of this xenobiotic have led to the restriction and prohibition of its use in many consumer products. To date, many chemical compounds with a chemical structure similar to bisphenol A have been used in consumer products as its replacement. The ubiquitous occurrence of bisphenol A and its substitutes in the environment and their endocrine activity as well as adverse effects on aquatic organisms is a global concern, especially because many available literature reports show that many substitutes (e.g. bisphenol AF, bisphenol AP, bisphenol B, bisphenol C, bisphenol F, bisphenol G, bisphenol FL, tetrabromobisphenol A) exert adverse effects on aquatic organisms, similar to, or even stronger than bisphenol A. Therefore, the objective of this paper is to provide a comprehensive overview of the production, sources, occurrence and associated toxicity, as well as the endocrine activity of bisphenol A and its substitutes on aquatic species. The environmental levels and ecotoxicological data presented in this review allowed for a preliminary assessment and prediction of the risk of bisphenol A and its substitutes for aquatic organisms. Furthermore, the data collected in this paper highlight that several compounds applied in bisphenol A-free products are not safe alternatives and regulations regarding their use should be introduced.
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Affiliation(s)
- Karolina Czarny-Krzymińska
- Laboratory of Environmental Threats, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, 91-403, Lodz, Tamka 12, Poland.
| | - Barbara Krawczyk
- Laboratory of Environmental Threats, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, 91-403, Lodz, Tamka 12, Poland
| | - Dominik Szczukocki
- Laboratory of Environmental Threats, Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, 91-403, Lodz, Tamka 12, Poland
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Dos Santos Magnabosco AR, Quinova EID, de Melo MVV, da Silva Bastos PE, Santos TP, da Silva Júnior II, de Andrade ALC, Padilha RMO, da Silva JF, de Sá FB, Cadena MRS, Cadena PG. Testosterone nanoemulsion produced masculinized Nile tilapia (Oreochromis niloticus). FISH PHYSIOLOGY AND BIOCHEMISTRY 2022; 48:1449-1462. [PMID: 36480096 DOI: 10.1007/s10695-022-01156-3] [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: 03/18/2022] [Accepted: 11/27/2022] [Indexed: 06/17/2023]
Abstract
The objective of this work was to develop a food additive for the sex reversal of Nile tilapia (Oreochromis niloticus) based on a simple oil in water (O/W) nanoemulsion with testosterone propionate for incorporation into commercial feed. Oil screening and evaluation of the organoleptic and physicochemical characteristics were carried out to determine the best formulation. A palatability test was also performed. Sex reversal test was assayed using 5 experimental groups: negative control - macerated feed without hormone; free testosterone - macerated feed with 60 mg/kg of testosterone propionate diluted in ethanol; and macerated feed with testosterone propionate nanoemulsion at a concentration of 30, 60, and 90 mg/kg. Stable nanoemulsions (size 76-210 nm) with testosterone propionate were produced. All nanoemulsion-added feed was palatable to tilapia. We obtained sex reversal values of ≈65, 75, and 72% in the groups of 30, 60, and 90 mg/kg, respectively. We can conclude that the nanoemulsion showed promising results; it is capable of inducing sex reversal in tilapia, is suitable as a commercial product, and has the potential to promote safety for rural staff and reduce the environmental impact of hormones.
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Affiliation(s)
- Amanda Rodrigues Dos Santos Magnabosco
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Ester Inácio Damião Quinova
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Matheus Victor Viana de Melo
- Departamento de Biologia (DB), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Paulo Eduardo da Silva Bastos
- Departamento de Biologia (DB), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Thamiris Pinheiro Santos
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco (UFPE), Av. Prof. Moraes Rego, s/n 50780-901, Recife, Pernambuco, Brazil
| | - Ivanildo Inácio da Silva Júnior
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - André Lucas Corrêa de Andrade
- Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco (UFPE), Av. Prof. Moraes Rego, s/n 50780-901, Recife, Pernambuco, Brazil
| | - Renata Meireles Oliveira Padilha
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Jadson Freitas da Silva
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Fabrício Bezerra de Sá
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Marília Ribeiro Sales Cadena
- Departamento de Biologia (DB), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil
| | - Pabyton Gonçalves Cadena
- Departamento de Morfologia E Fisiologia Animal (DMFA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil.
- Laboratório de Ecofisiologia E Comportamento Animal (LECA), Universidade Federal Rural de Pernambuco, Av. Dom Manoel de Medeiros S/N, Dois Irmãos, Recife, PE, 52171-900, Brazil.
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Yao Z, Seong HJ, Jang YS. Environmental toxicity and decomposition of polyethylene. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 242:113933. [PMID: 35930840 DOI: 10.1016/j.ecoenv.2022.113933] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 07/26/2022] [Accepted: 07/28/2022] [Indexed: 06/15/2023]
Abstract
In the more than 100 years since the invention of plastics, various plastic polymers have been developed that exhibit different characteristics and have been widely used in production and life. In 2020 alone, nearly 400 million tons of plastics were produced globally. However, while plastic such as polyethylene brings us convenience, it also threatens environmental sustainability and human health. Due to insufficient recycling efficiency, millions of tons of polyethylene pollutants accumulate in terrestrial or marine environments each year. Polyethylene is elastic, chemically stable, and non-biodegradable, and the traditional disposal methods include landfilling and incineration. These methods are costly, unsustainable, and further increase the burden on the environment. Therefore, recent research has increasingly focused on the biodegradation of polyethylene. In this work, we briefly summarized polyethylene's properties and environmental toxicity. We also reviewed the recent advances in the biodegradation of polyethylene with a summary of traditional abiotic methods. Finally, we proposed a brief research direction in polyethylene study with the aspect of environmental toxicology and industrial applications of decomposition technology.
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Affiliation(s)
- Zhuang Yao
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Republic of Korea
| | - Hyeon Jeong Seong
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Republic of Korea
| | - Yu-Sin Jang
- Division of Applied Life Science (BK21), Department of Applied Life Chemistry, Institute of Agriculture & Life Science (IALS), Gyeongsang National University, Jinju, Republic of Korea.
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Hidalgo-Serrano M, Borrull F, Marcé RM, Pocurull E. Phthalate esters in marine ecosystems: analytical methods, occurrence and distribution. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116598] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Liang H, Gong J, Zhou K, Deng L, Chen J, Guo L, Jiang M, Lin J, Tang H, Liu X. Removal efficiencies and risk assessment of endocrine-disrupting chemicals at two wastewater treatment plants in South China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 225:112758. [PMID: 34507038 DOI: 10.1016/j.ecoenv.2021.112758] [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: 07/08/2021] [Revised: 08/26/2021] [Accepted: 09/03/2021] [Indexed: 05/25/2023]
Abstract
Endocrine-disrupting chemicals (EDCs) in the effluent from wastewater treatment plants (WWTPs) are an important pollutant sources of the aquatic system. In this study, the removal efficiencies of eight typical EDCs at two domestic WWTPs in Dongguan City, China, are reported based on instrumental analysis and bioassay results. Bioactivities, including steroidogenesis-disrupting effects, estrogen receptor (ER)-binding activity, and aryl hydrocarbon receptor (AhR)-binding activity were evaluated using the H295R, MVLN, and H4IIE cell bioassays, respectively. The potential environmental risks of these residual EDCs were also evaluated. The results of instrumental analysis showed that nonylphenol was the major chemical type present among the eight tested EDCs. Meanwhile, concentrations of estrogen compounds including estrone, 17β-estradiol (E2), estriol, 17α-ethinyl estradiol, and diethylstilbestrol were relatively low. The removal rates of all eight EDCs were relatively high. Although the chemical analysis indicated high removal efficiency, the bioassay results showed that steroidogenesis-disrupting effects as well as ER-binding and AhR-binding activities remained, with E2-equivalent values of effluent samples ranging from 0.16 to 0.9 ng·L-1, and 2,3,7,8-tetrachlorodibenzo-p-dioxin-equivalent values ranging from 0.61 to 4.09 ng L-1. Principal component analysis combined with regression analysis suggests that the chemicals analyzed in this study were partly responsible for these ER and AhR activities. Ecological risk assessment of the residual EDCs showed that estrone was the most hazardous chemical among the eight EDCs tested, with a risk quotient of 1.44-5.50. Overall, this study suggests that, despite high apparent removal efficiencies of typical EDCs, their bioactivities and potential ecological risks cannot be ignored.
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Affiliation(s)
- Hairong Liang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Jian Gong
- School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, China
| | - Kairu Zhou
- School of Public Administration, South China University of Technology, Guangzhou, Guangdong 510641, China
| | - Langjing Deng
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Jiaxin Chen
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Lihao Guo
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Mengzhu Jiang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Juntong Lin
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Huanwen Tang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China
| | - Xiaoshan Liu
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Guangdong 523808, China.
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Magalhães RP, Cunha JM, Sousa SF. Perspectives on the Role of Enzymatic Biocatalysis for the Degradation of Plastic PET. Int J Mol Sci 2021; 22:11257. [PMID: 34681915 PMCID: PMC8540959 DOI: 10.3390/ijms222011257] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/13/2021] [Accepted: 10/16/2021] [Indexed: 12/25/2022] Open
Abstract
Plastics are highly durable and widely used materials. Current methodologies of plastic degradation, elimination, and recycling are flawed. In recent years, biodegradation (the usage of microorganisms for material recycling) has grown as a valid alternative to previously used methods. The evolution of bioengineering techniques and the discovery of novel microorganisms and enzymes with degradation ability have been key. One of the most produced plastics is PET, a long chain polymer of terephthalic acid (TPA) and ethylene glycol (EG) repeating monomers. Many enzymes with PET degradation activity have been discovered, characterized, and engineered in the last few years. However, classification and integrated knowledge of these enzymes are not trivial. Therefore, in this work we present a summary of currently known PET degrading enzymes, focusing on their structural and activity characteristics, and summarizing engineering efforts to improve activity. Although several high potential enzymes have been discovered, further efforts to improve activity and thermal stability are necessary.
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Affiliation(s)
- Rita P. Magalhães
- UCIBIO—Applied Molecular Biosciences Unit, BioSIM—Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal; (R.P.M.); (J.M.C.)
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal
| | - Jorge M. Cunha
- UCIBIO—Applied Molecular Biosciences Unit, BioSIM—Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal; (R.P.M.); (J.M.C.)
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal
| | - Sérgio F. Sousa
- UCIBIO—Applied Molecular Biosciences Unit, BioSIM—Departamento de Biomedicina, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal; (R.P.M.); (J.M.C.)
- Associate Laboratory i4HB—Institute for Health and Bioeconomy, Faculdade de Medicina, Universidade do Porto, 4200-319 Porto, Portugal
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Kumar R, Pandit P, Kumar D, Patel Z, Pandya L, Kumar M, Joshi C, Joshi M. Landfill microbiome harbour plastic degrading genes: A metagenomic study of solid waste dumping site of Gujarat, India. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 779:146184. [PMID: 33752005 DOI: 10.1016/j.scitotenv.2021.146184] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 05/21/2023]
Abstract
Globally, environmental pollution by plastic waste has become a severe ecological and social problem worldwide. The present study aimed to analyse the bacterial community structure and functional potential of the landfill site using high throughput shotgun metagenomic approach to understand plastic degrading capabilities present in the municipal solid waste (MSW) dumping site. In this study, soil, leachate and compost samples were collected from various locations (height and depth) of the Pirana landfill site in Ahmedabad city Gujarat, India. In total 30 phyla, 58 class, 125 order, 278 families, 793 genera, and 2468 species were predicted. The most dominant phyla detected were Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria in the soil and compost samples. Whereas, in leachate samples, the predominant phyla belonged to Firmicutes (54.24%) followed by Actinobacteria (43.67%) and Proteobacteria (1.02%). The functional profiling revealed the presence of enzymatic groups and pathways involved in biodegradation of xenobiotics. The results also demonstrated the presence of potential genes that is associated with the biodegradation of different types of plastics such as polyethylene (PE), polyethylene terephthalate (PET), and polystyrene (PS). Present study extablishes the relationship between microbial community structure and rich sources of gene pool, which are actively involved in biodegradation of plastic waste in landfill sites.
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Affiliation(s)
- Raghawendra Kumar
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Priti Pandit
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Dinesh Kumar
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Zarna Patel
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Labdhi Pandya
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Manish Kumar
- Discipline of Earth Sciences, Indian Institute of Technology Gandhinagar, Gujarat 382355, India.
| | - Chaitanya Joshi
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India
| | - Madhvi Joshi
- Gujarat Biotechnology Research Centre, Gandhinagar, Gujarat 382011, India.
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Jung JW, Kang JS, Choi J, Park JW. A Novel Approach to Derive the Predicted No-Effect Concentration (PNEC) of Benzophenone-3 (BP-3) Using the Species Sensitivity Distribution (SSD) Method: Suggestion of a New PNEC Value for BP-3. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18073650. [PMID: 33807469 PMCID: PMC8037607 DOI: 10.3390/ijerph18073650] [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] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 03/28/2021] [Accepted: 03/29/2021] [Indexed: 11/17/2022]
Abstract
The necessity for the aquatic ecological risk assessment for benzophenone-3 (BP-3) is increasing due to its high toxic potential and high detection frequency in freshwater. The initial step in the ecological risk assessment is to determine predicted no-effect concentration (PNEC). This study derived PNEC of BP-3 in freshwater using a species sensitivity distribution (SSD) approach, whilst existing PNECs are derived using assessment factor (AF) approaches. A total of eight chronic toxicity values, obtained by toxicity testing and a literature survey, covering four taxonomic classes (fish, crustaceans, algae, and cyanobacteria) were used for PNEC derivation. Therefore, the quantity and quality of the toxicity data met the minimum requirements for PNEC derivation using an SSD approach. The PNEC derived in this study (73.3 μg/L) was far higher than the environmental concentration detected in freshwater (up to 10.4 μg/L) as well as existing PNECs (0.67~1.8 μg/L), mainly due to the difference in the PNEC derivation methodology (i.e., AF vs. SSD approach). Since the SSD approach is regarded as more reliable than the AF approach, we recommend applying the PNEC value derived in this study for the aquatic ecological risk assessment of BP-3, as the use of the existing PNEC values seems to unnecessarily overestimate the potential ecological risk of BP-3 in freshwater.
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Affiliation(s)
- Jae-Woong Jung
- Center for Defense Acquisition and Requirements Analysis, Korea Institute for Defense Analyses, Seoul 02455, Korea;
| | - Jae Soon Kang
- Department of Anatomy and Convergence Medical Science, Institute of Health Science, Bio Anti-Aging Medical Research Center, Gyeongsang National University Medical School, Jinju 52727, Korea;
| | - Jinsoo Choi
- Department of Environmental Toxicology and Chemistry, Korea Institute of Toxicology, Jinju 52834, Korea;
| | - June-Woo Park
- Department of Environmental Toxicology and Chemistry, Korea Institute of Toxicology, Jinju 52834, Korea;
- Human and Environmental Toxicology Program, Korea University of Science and Technology (UST), Daejeon 34113, Korea
- Correspondence: ; Tel.: +82-55-750-3833
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Haloarchaea as Cell Factories to Produce Bioplastics. Mar Drugs 2021; 19:md19030159. [PMID: 33803653 PMCID: PMC8003077 DOI: 10.3390/md19030159] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/03/2021] [Accepted: 03/16/2021] [Indexed: 11/16/2022] Open
Abstract
Plastic pollution is a worldwide concern causing the death of animals (mainly aquatic fauna) and environmental deterioration. Plastic recycling is, in most cases, difficult or even impossible. For this reason, new research lines are emerging to identify highly biodegradable bioplastics or plastic formulations that are more environmentally friendly than current ones. In this context, microbes, capable of synthesizing bioplastics, were revealed to be good models to design strategies in which microorganisms can be used as cell factories. Recently, special interest has been paid to haloarchaea due to the capability of some species to produce significant concentrations of polyhydroxyalkanoate (PHA), polyhydroxybutyrate (PHB), and polyhydroxyvalerate (PHV) when growing under a specific nutritional status. The growth of those microorganisms at the pilot or industrial scale offers several advantages compared to that of other microbes that are bioplastic producers. This review summarizes the state of the art of bioplastic production and the most recent findings regarding the production of bioplastics by halophilic microorganisms with special emphasis on haloarchaea. Some protocols to produce/analyze bioplastics are highlighted here to shed light on the potential use of haloarchaea at the industrial scale to produce valuable products, thus minimizing environmental pollution by plastics made from petroleum.
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Amobonye A, Bhagwat P, Singh S, Pillai S. Plastic biodegradation: Frontline microbes and their enzymes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 759:143536. [PMID: 33190901 DOI: 10.1016/j.scitotenv.2020.143536] [Citation(s) in RCA: 151] [Impact Index Per Article: 50.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/16/2020] [Accepted: 10/17/2020] [Indexed: 05/07/2023]
Abstract
Plastic polymers with different properties have been developed in the last 150 years to replace materials such as wood, glass and metals across various applications. Nevertheless, the distinct properties which make plastic desirable for our daily use also threaten our planet's sustainability. Plastics are resilient, non-reactive and most importantly, non-biodegradable. Hence, there has been an exponential increase in plastic waste generation, which has since been recognised as a global environmental threat. Plastic wastes have adversely affected life on earth, primarily through their undesirable accumulation in landfills, leaching into the soil, increased greenhouse gas emission, etc. Even more damaging is their impact on the aquatic ecosystems as they cause entanglement, ingestion and intestinal blockage in aquatic animals. Furthermore, plastics, especially in the microplastic form, have also been found to interfere with chemical interaction between marine organisms, to cause intrinsic toxicity by leaching, and by absorbing persistent organic contaminants as well as pathogens. The current methods for eliminating these wastes (incineration, landfilling, and recycling) come at massive costs, are unsustainable, and put more burden on our environment. Thus, recent focus has been placed more on the potential of biological systems to degrade synthetic plastics. In this regard, some insects, bacteria and fungi have been shown to ingest these polymers and convert them into environmentally friendly carbon compounds. Hence, in the light of recent literature, this review emphasises the multifaceted roles played by microorganisms in this process. The current understanding of the roles played by actinomycetes, algae, bacteria, fungi and their enzymes in enhancing the degradation of synthetic plastics are reviewed, with special focus on their modes of action and probable enzymatic mechanisms. Besides, key areas for further exploration, such as the manipulation of microorganisms through molecular cloning, modification of enzymatic characteristics and metabolic pathway design, are also highlighted.
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Affiliation(s)
- Ayodeji Amobonye
- Department of Biotechnology and Food Technology, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
| | - Prashant Bhagwat
- Department of Biotechnology and Food Technology, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
| | - Suren Singh
- Department of Biotechnology and Food Technology, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
| | - Santhosh Pillai
- Department of Biotechnology and Food Technology, Faculty of Applied Sciences, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
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Ribeiro-Brasil DRG, Torres NR, Picanço AB, Sousa DS, Ribeiro VS, Brasil LS, Montag LFDA. Contamination of stream fish by plastic waste in the Brazilian Amazon. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115241. [PMID: 32755795 DOI: 10.1016/j.envpol.2020.115241] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 07/09/2020] [Accepted: 07/10/2020] [Indexed: 05/16/2023]
Abstract
Pollution by plastics is a global problem, in particular through the contamination of aquatic environments and biodiversity. Although plastic contamination is well documented in the aquatic fauna of the oceans and large rivers of the world, there are few data on the organisms of headwater streams, especially in tropical regions. In the present study, we evaluated the contamination of small fish by plastics in Amazonian streams. For this, we evaluated the shape and size, and the abundance of plastics in the gastrointestinal tracts and gills of 14 fish species from 12 streams in eastern Brazilian Amazon. We used a Generalized Linear Mixed Model (GLMM) to compare the levels of contamination among species and between organs. Only one individual of the 68 evaluated (a small catfish Mastiglanis cf. asopos) contained no plastic particles, and no difference was found in the contamination of the gills and digestive tract. However, Hemigrammus unilineatus presented less contamination of both the gills and the digestive tract than the other species, while Polycentrus schomburgkii had less plastic in the gastrointestinal tract, whereas Crenicichla regani and Pimelodella gerii both had a larger quantity of plastic adhered to their gills in comparison with the other species. Nanoplastics and microplastics adhered most to the gills, while plastic fibers were the most common type of material overall. This is the first study to analyze plastic contamination in fish from Amazonian streams, and in addition to revealing high levels of contamination, some species were shown to possibly be more susceptible than others. This reinforces the need for further, more systematic research into the biological and behavioral factors that may contribute to the greater vulnerability of some fish species to contamination by plastics. Amazonian stream fish show contamination by plastics. The species respond differently. The smaller the particle, the easier it is to adhere to the gills.
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Affiliation(s)
- Danielle Regina Gomes Ribeiro-Brasil
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil; Programa de Pós-graduação em Ecologia, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil.
| | - Naiara Raiol Torres
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil; Programa de Pós-graduação em Ecologia Aquática e Pesca, Núcleo de Ecologia Aquática e Pesca, Universidade Federal do Pará, Av. Perimetral, 2651 - Terra Firme, Belém, PA, 66077-530, Brazil
| | - Ana Beatriz Picanço
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil
| | - David Silva Sousa
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil
| | - Vanessa Serrão Ribeiro
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil
| | - Leandro Schlemmer Brasil
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil; Programa de Pós-graduação em Zoologia, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil
| | - Luciano Fogaça de Assis Montag
- Laboratório de Ecologia e Conservação, Instituto de Ciências Biológicas, Universidade Federal do Pará, Av. Perimetral, 2-224 - Guamá, Belém, PA, 66077-830, Brazil; Programa de Pós-graduação em Ecologia Aquática e Pesca, Núcleo de Ecologia Aquática e Pesca, Universidade Federal do Pará, Av. Perimetral, 2651 - Terra Firme, Belém, PA, 66077-530, Brazil
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