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Machado MD, Soares EV. Features of the microalga Raphidocelis subcapitata: physiology and applications. Appl Microbiol Biotechnol 2024; 108:219. [PMID: 38372796 PMCID: PMC10876740 DOI: 10.1007/s00253-024-13038-0] [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: 08/30/2023] [Revised: 01/23/2024] [Accepted: 01/25/2024] [Indexed: 02/20/2024]
Abstract
The microalga Raphidocelis subcapitata was isolated from the Nitelva River (Norway) and subsequently deposited in the collection of the Norwegian Institute of Water Research as "Selenastrum capricornutum Printz". This freshwater microalga, also known as Pseudokirchneriella subcapitata, acquired much of its notoriety due to its high sensitivity to different chemical species, which makes it recommended by different international organizations for the assessment of ecotoxicity. However, outside this scope, R. subcapitata continues to be little explored. This review aims to shed light on a microalga that, despite its popularity, continues to be an "illustrious" unknown in many ways. Therefore, R. subcapitata taxonomy, phylogeny, shape, size/biovolume, cell ultra-structure, and reproduction are reviewed. The nutritional and cultural conditions, chronological aging, and maintenance and preservation of the alga are summarized and critically discussed. Applications of R. subcapitata, such as its use in aquatic toxicology (ecotoxicity assessment and elucidation of adverse toxic outcome pathways) are presented. Furthermore, the latest advances in the use of this alga in biotechnology, namely in the bioremediation of effluents and the production of value-added biomolecules and biofuels, are highlighted. To end, a perspective regarding the future exploitation of R. subcapitata potentialities, in a modern concept of biorefinery, is outlined. KEY POINTS: • An overview of alga phylogeny and physiology is critically reviewed. • Advances in alga nutrition, cultural conditions, and chronological aging are presented. • Its use in aquatic toxicology and biotechnology is highlighted.
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Affiliation(s)
- Manuela D Machado
- Bioengineering Laboratory - CIETI, ISEP-School of Engineering, Polytechnic Institute of Porto, Rua Dr António Bernardino de Almeida, 431, 4249-015, Porto, Portugal
- CEB - Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal
- LABBELS - Associate Laboratory, Braga/Guimarães, Portugal
| | - Eduardo V Soares
- Bioengineering Laboratory - CIETI, ISEP-School of Engineering, Polytechnic Institute of Porto, Rua Dr António Bernardino de Almeida, 431, 4249-015, Porto, Portugal.
- CEB - Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal.
- LABBELS - Associate Laboratory, Braga/Guimarães, Portugal.
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2
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Campos F, Silva PV, Soares AMVM, Martins R, Loureiro S. Harmonizing nanomaterial exposure methodologies in ecotoxicology: the effects of two innovative nanoclays in the freshwater microalgae Raphidocelis subcapitata. Nanotoxicology 2023; 17:401-419. [PMID: 37452626 DOI: 10.1080/17435390.2023.2231071] [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: 12/18/2022] [Revised: 05/14/2023] [Accepted: 06/22/2023] [Indexed: 07/18/2023]
Abstract
Layered double hydroxides (LDHs) are innovative nanomaterials (NMs) with a typical nanoclay structure (height <40 nm) consisting of layers of metallic cations and hydroxides stabilized by anions and water molecules. Upon specific triggers, anions can exchange by others in the surrounding environment. Due to this stimuli-responsive behavior, LDHs are used as carriers of active ingredients in the industrial or pharmaceutical sectors. Available technical guidelines to evaluate the ecotoxicity of conventional substances do not account for the specificities of NMs, leading to inaccuracies and uncertainty. The present study aimed to assess two different exposure methodologies (serial dilutions of the stock dispersion vs. direct addition of NM powder to each concentration) on the ecotoxicological profile of different powder grain sizes of Zn-Al LDH-NO3 and Cu-Al LDH-NO3 (bulk, <25, 25-63, 63-125, 125-250, and >250 µm) in the growth of the freshwater microalgae Raphidocelis subcapitata. Results revealed that the serial dilutions methodology was preferable for Zn-Al LDH-NO3, whereas for Cu-Al LDH-NO3 both methodologies were suitable. Thus, the serial dilutions methodology was selected to assess the ecotoxicity of different grain sizes for both LDHs. All Zn-Al LDH-NO3 grain sizes yielded similar toxicity, while Cu-Al LDH-NO3 powders with smaller grain sizes caused a higher effect on microalgae growth; thus, grain size separation might be advantageous for future applications of Cu-Al LDH-NO3s. Considering the differences between exposure methodologies for the Zn-Al LDH-NO3, further research involving other NMs and species must be carried out to achieve harmonization and validation for inter-laboratory comparison.
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Affiliation(s)
- Fábio Campos
- CESAM - Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Patrícia V Silva
- CICECO - Aveiro Institute of Materials and Department of Materials and Ceramic Engineering, University of Aveiro, Aveiro, Portugal
| | - Amadeu M V M Soares
- CESAM - Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Roberto Martins
- CESAM - Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal
| | - Susana Loureiro
- CESAM - Centre for Environmental and Marine Studies and Department of Biology, University of Aveiro, Aveiro, Portugal
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3
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Bernard E, Guéguen C. Molecular changes in phenolic compounds in Euglena gracilis cells grown under metal stress. FRONTIERS IN PLANT SCIENCE 2023; 14:1099375. [PMID: 37229138 PMCID: PMC10203486 DOI: 10.3389/fpls.2023.1099375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 04/21/2023] [Indexed: 05/27/2023]
Abstract
Metal presence in the aquatic ecosystem has increased and diversified over the last decades due to anthropogenic sources. These contaminants cause abiotic stress on living organisms that lead to the production of oxidizing molecules. Phenolic compounds are part of the defense mechanisms countering metal toxicity. In this study, the production of phenolic compounds by Euglena gracilis under three different metal stressors (i.e. cadmium, copper, or cobalt) at sub-lethal concentration was assessed using an untargeted metabolomic approach by mass spectrometry combined with neuronal network analysis (i.e. Cytoscape). The metal stress had a greater impact on molecular diversity than on the number of phenolic compounds. The prevalence of sulfur- and nitrogen-rich phenolic compounds were found in Cd- and Cu-amended cultures. Together these results confirm the impact of metallic stress on phenolic compounds production, which could be utilized to assess the metal contamination in natural waters.
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Tang Y, Zhang B, Li Z, Deng P, Deng X, Long H, Wang X, Huang K. Overexpression of the sulfate transporter-encoding SULTR2 increases chromium accumulation in Chlamydomonas reinhardtii. Biotechnol Bioeng 2023; 120:1334-1345. [PMID: 36776103 DOI: 10.1002/bit.28350] [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: 11/04/2022] [Revised: 01/11/2023] [Accepted: 02/09/2023] [Indexed: 02/14/2023]
Abstract
Hexavalent chromium [Cr(Ⅵ)] is a highly toxic contaminant in aquatic systems, and microalgae represent promising bioremediators of metal-containing wastewater. However, the metal-binding capacity of algal cells is limited. Therefore, we improved the cellular Cr(Ⅵ) biosorption capacity of Chlamydomonas reinhardtii by overexpressing the sulfate transporter gene SULTR2. SULTR2 was predominantly located in the cytoplasm of the cell, and few proteins mobilized to the cell membrane as a Cr transporter under Cr stress conditions. Intracellular Cr accumulation was almost doubled in SULTR2-overexpressing transgenic strains after exposure to 30 μM K2 Cr2 O7 for 4 d. Alginate-based immobilization increased the rate of Cr removal from 43.81% to 88.15% for SULTR2-overexpressing transgenic strains after exposure to 10 μM K2 Cr2 O7 for 6 d. The immobilized cells also displayed a significant increase in nutrient removal efficiency compared to that of free-swimming cells. Therefore, SULTR2 overexpression in algae has a great potential for the bioremediation of Cr(Ⅵ)-containing wastewater.
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Affiliation(s)
- Yuxin Tang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Baolong Zhang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Zhaoyang Li
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Ping Deng
- Wuhan Academy of Agricultural Sciences, Wuhan, Hubei, China
| | - Xuan Deng
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Huan Long
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
| | - Xun Wang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, Hubei, China
| | - Kaiyao Huang
- Key Laboratory of Algal Biology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, Hubei, China
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Bertanza G, Steimberg N, Pedrazzani R, Boniotti J, Ceretti E, Mazzoleni G, Menghini M, Urani C, Zerbini I, Feretti D. Wastewater toxicity removal: Integrated chemical and effect-based monitoring of full-scale conventional activated sludge and membrane bioreactor plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 851:158071. [PMID: 35988629 DOI: 10.1016/j.scitotenv.2022.158071] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/12/2022] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
The literature is currently lacking effect-based monitoring studies targeted at evaluating the performance of full-scale membrane bioreactor plants. In this research, a monitoring campaign was performed at a full-scale wastewater treatment facility with two parallel lines (traditional activated sludge and membrane bioreactor). Beside the standard parameters (COD, nitrogen, phosphorus, and metals), 6 polynuclear aromatic hydrocarbons, 29 insecticides, 2 herbicides, and 3 endocrine disrupting compounds were measured. A multi-tiered battery of bioassays complemented the investigation, targeting different toxic modes of action and employing various biological systems (uni/multicellular, prokaryotes/eukaryotes, trophic level occupation). A traffic light scoring approach was proposed to quickly visualize the impact of treatment on overall toxicity that occurred after the exposure to raw and concentrated wastewater. Analysis of the effluents of the CAS and MBR lines show very good performance of the two systems for removal of organic micropollutants and metals. The most noticeable differences between CAS and MBR occurred in the concentration of suspended solids; chemical analyses did not show major differences. On the other hand, bioassays demonstrated better performance for the MBR. Both treatment lines complied with the Italian law's "ecotoxicity standard for effluent discharge in surface water". Yet, residual biological activity was still detected, demonstrating the adequacy and sensitivity of the toxicological tools, which, by their inherent nature, allow the overall effects of complex mixtures to be taken into account.
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Affiliation(s)
- Giorgio Bertanza
- DICATAM-Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, Via Branze 43, I-25123 Brescia, Italy; MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
| | - Nathalie Steimberg
- MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy; DSCS-Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
| | - Roberta Pedrazzani
- MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy; DIMI-Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, I-25123 Brescia, Italy.
| | - Jennifer Boniotti
- DSCS-Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy
| | - Elisabetta Ceretti
- DSMC-Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
| | - Giovanna Mazzoleni
- MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy; DSCS-Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
| | - Michele Menghini
- DIMI-Department of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, I-25123 Brescia, Italy.
| | - Chiara Urani
- MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy; DISAT-Department of Earth and Environmental Sciences, University of Milan-Bicocca, Piazza della Scienza 1, I-20126 Milano, Italy.
| | - Ilaria Zerbini
- DSMC-Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
| | - Donatella Feretti
- MISTRAAL Interdepartmental Research Center - MISTRAL - Inter-University Research Center "Integrated Models for Prevention and Protection in Environmental and Occupational Health", DSCS, Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy; DSMC-Department of Medical and Surgical Specialties, Radiological Sciences and Public Health, University of Brescia, Viale Europa 11, I-25123 Brescia, Italy.
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Toxicity Assessment and Treatment Options of Diclofenac and Triclosan Dissolved in Water. TOXICS 2022; 10:toxics10080422. [PMID: 36006101 PMCID: PMC9415529 DOI: 10.3390/toxics10080422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Revised: 07/24/2022] [Accepted: 07/25/2022] [Indexed: 11/17/2022]
Abstract
The presence of pharmaceutical and personal care products in water is increasing tremendously nowadays. Typical representatives are diclofenac (DCF) and triclosan (TCS). Acute toxicity of these substances was experimentally assessed using the freshwater algae Raphidocelis subcapitata (living, immobilized). The IC50 achieved for R. subcapitata was 177.7–189.1 mg·L−1 for DCF and 5.4–17.2 µg·L−1 for TCS, whereas, regarding DCF, the results corresponded to the values observed by other authors. Concerning TCS, the results were lower than predicted and indicated TCSs’ higher toxicity. The immobilized R. subcapitata showed comparable results with its living culture for DCF only. Regarding K2Cr2O7 and TCS, the immobilized alga was more sensitive. The DCF and TCF removal from water was tested by sorption, photocatalytic and photolytic processes. TiO2 was used as a photocatalyst. Norit and SuperSorbon were used as sorbents based on activated charcoal. The DCF decomposition achieved by both photo-processes was very fast. The starting concentration fell below the detection limit in less than one minute, while bioluminescence on Aliivibrio fischeri showed no toxic intermediates formed only in the case of photocatalysis. DCF and TCS removals by sorption were significantly faster on Norit than SuperSorbon, while the bioluminescence inhibition remained insignificant.
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Chen QS, Yuan X, Peng F, Lou WY. Immobilization of engineered E. coli cells for asymmetric reduction of methyl acetoacetate to methyl-(R)-3-hydroxybutyrate. BIORESOUR BIOPROCESS 2022; 9:19. [PMID: 38647599 PMCID: PMC10991218 DOI: 10.1186/s40643-022-00508-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 02/22/2022] [Indexed: 11/10/2022] Open
Abstract
The efficient asymmetric bio-synthesis of chiral β-hydroxy esters is of great importance for industrial production. In this work, a simple and productive engineered E.coli cell-immobilized strategy was applied for the asymmetric reduction of MAA to (R)-HBME with high enantioselectivity. Compared with the corresponding inactivated free cells, the alginate-immobilized cells remained 45% of initial activity at 50 ℃ and 65% after reuse of 10 times. After 60 days of storage at 4 ℃, the immobilized cells maintained more than 80% relative activity. Immobilization contributed significantly to the improvement of thermal stability, pH tolerance, storage stability and operation stability without affecting the yield of product. The immobilized recombinant E. coli cell had absolute enantioselectivity for the asymmetric reduction of MAA to (R)-HBME with e.e. > 99.9%. Therefore, microbial cell immobilization is a perspective approach in asymmetric synthesis of chiral β-hydroxy esters for industrial applications.
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Affiliation(s)
- Qing-Sheng Chen
- Lab of Applied Biocatalysis, School of Food Science and Technology, South China University of Technology, Guangzhou, 510640, Guangdong, China
| | - Xin Yuan
- Lab of Applied Biocatalysis, School of Food Science and Technology, South China University of Technology, Guangzhou, 510640, Guangdong, China
| | - Fei Peng
- Lab of Applied Biocatalysis, School of Food Science and Technology, South China University of Technology, Guangzhou, 510640, Guangdong, China
| | - Wen-Yong Lou
- Lab of Applied Biocatalysis, School of Food Science and Technology, South China University of Technology, Guangzhou, 510640, Guangdong, China.
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Dos Reis LL, Alho LDOG, de Abreu CB, Gebara RC, Mansano ADS, Melão MDGG. Effects of cadmium and cobalt mixtures on growth and photosynthesis of Raphidocelis subcapitata (Chlorophyceae). AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 244:106077. [PMID: 35091369 DOI: 10.1016/j.aquatox.2022.106077] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 01/08/2022] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
Metals occur simultaneously in the environment, and therefore it is important to know their toxicity and mechanism of action when associated with another metal. Furthermore, anthropogenic actions increase their concentrations in the environment where they can interact and undergo transformations that can even increase their toxicity. This study aimed to evaluate the effects of cadmium (Cd) and cobalt (Co), isolated and combined, on the microalgae Raphidocelis subcapitata. Regarding the toxicity of isolated metals, the IC5096 h was 0.08 mg L-1 of Cd and 0.16 mg L-1 of Co. Cell density decreased at all concentrations of the Cd tested. The parameters related to cell size, cell complexity and mean cell chlorophyll a (Chl a) fluorescence were significantly affected by both metals. According to species sensitivity curves (SSD), the microalgae R. subcapitata was the second most sensitive organism to Co exposure and the tenth concerning Cd. Metal mixture data were best fitted to the concentration addition (CA) model and dose-ratio dependence (DR) deviation, showing synergism at high concentrations of Co and low concentrations of Cd. Besides that, antagonism was observed at low concentrations of Co and high concentrations of Cd. Photosynthetic performance, assessed by maximum quantum yield (ΦM) and oxygen evolving complex (OEC), presented antagonism effects for both analyzed parameters. Thus, the mixture of Cd and Co showed synergistic and antagonistic interactions for the parameters analyzed in R. Subcapitata, indicating the importance of understanding the mechanisms of toxicity of metal mixtures in phytoplankton.
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Affiliation(s)
- Larissa Luiza Dos Reis
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil; Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, Zip Code 13565- 905, São Carlos, SP, Brazil.
| | - Lays de Oliveira Gonçalves Alho
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil; Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, Zip Code 13565- 905, São Carlos, SP, Brazil
| | - Cínthia Bruno de Abreu
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil; Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, Zip Code 13565- 905, São Carlos, SP, Brazil
| | - Renan Castelhano Gebara
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil; Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, Zip Code 13565- 905, São Carlos, SP, Brazil
| | - Adrislaine da Silva Mansano
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil; Post-Graduate Program in Ecology and Natural Resources (PPGERN), Universidade Federal de São Carlos (UFSCar), Rodovia Washington Luís, Km 235, Zip Code 13565- 905, São Carlos, SP, Brazil
| | - Maria da Graça Gama Melão
- Universidade Federal de São Carlos - UFSCar, Department of Hydrobiology, Rodovia Washington Luís, Km 235, Zip Code 13565-905, São Carlos, SP, Brazil
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Pereao O, Akharame MO, Opeolu B. Effects of municipal wastewater treatment plant effluent quality on aquatic ecosystem organisms. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2021; 56:1480-1489. [PMID: 34870555 DOI: 10.1080/10934529.2021.2009730] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 11/15/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
The management and quality monitoring of wastewater have an important role in sustainable development. A recent approach in environmental protection involves the ecotoxicological assessment of effluents to complement the usual chemical evaluations. This study assessed the impacts of wastewater treatment plant (WWTP) effluent quality in a location in Western Cape province, South Africa using organisms that bear different ecosystem-level function responsibilities like the Pseudokirchneriella subcapitata (microalgae), Daphnia magna (crustaceans), and Tetrahymena thermophila (protozoan) in addition to the physicochemical parameters. The effluent showed values of chemical oxygen demand (COD; 41-83 mg L-1), dissolved oxygen (DO; 2.7-3.1 mg L-1), Redox potential (189-265 mV), and total dissolved solids (TDS; 656-718 ppm). The protozoan Tetrahymena thermophila ecotoxicity test exhibited toxic effects of the effluents within 24-h with a mean lethal value (LC50) of 1.12% for the winter season. The findings of this study revealed that analyzed physicochemical parameters are within the regulatory water quality acceptable standard thresholds with few exceptions, while the biotests were able to determine the toxicity levels and sensitivities of each test. The results showed that the WWTP whole effluent exerted toxicity to test organisms, but dilution can mitigate the effects considerably. The use of ecotoxicological assessment methods for municipal WWTP effluent may enhance existing water management strategies.
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Affiliation(s)
- Omoniyi Pereao
- Environmental Chemistry and Toxicology Research Group, Department of Environmental and Occupational Studies, Faculty of Applied Sciences, Cape Peninsula University of Technology, Bellville, South Africa
- Federal Ministry of Education, Federal Secretarial Phase III, Abuja, FCT, Nigeria
| | - Michael Ovbare Akharame
- Department of Chemistry, Faculty of Applied Sciences, Cape Peninsula University of Technology, Cape Town, South Africa
| | - Beatrice Opeolu
- Environmental Chemistry and Toxicology Research Group, Department of Environmental and Occupational Studies, Faculty of Applied Sciences, Cape Peninsula University of Technology, Bellville, South Africa
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10
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Manikandan A, Suresh Babu P, Shyamalagowri S, Kamaraj M, Muthukumaran P, Aravind J. Emerging role of microalgae in heavy metal bioremediation. J Basic Microbiol 2021; 62:330-347. [PMID: 34724223 DOI: 10.1002/jobm.202100363] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/27/2021] [Accepted: 10/17/2021] [Indexed: 12/16/2022]
Abstract
Microalgae have been publicized for their diversified dominance responsiveness and bioaccumulation potential toward pollutants in an ecosystem. Also, algal's incredible capability as biocatalysts in environmental appliances has been well elucidated owing to their robustness and simple nutritional demand. Additionally, microalgae can deliver various collections of bio-based chemical compounds helpful for diversified applications, especially as green alternatives. The environment has been contaminated with various polluting agents; one principal polluting agent is heavy metals which are carcinogenic and show toxicity even in minimal quantity, cause unsatisfactory threats to the environmental ecosystem, including human and animal health. There is a prominent tendency to apply microalgae in the phytoremediation of heavy metals compounds because of its vast benefits, including great accessibility, cost-effective, excellent toxic metal eliminating efficiency, and nontoxic to the ecosystem. This review uncovers the most recent advancements and mechanisms associated with the bioremediation process and biosorption interaction of substantial harmful synthetic compounds processing microalgae species. Furthermore, future challenges and prospects in the utilization of microalgae in heavy metals bioremediation are also explored. The current review aims to give valuable information to aid the advancement of robust and proficient future microalgae-based heavy metal bioremediation innovations and summarizing a wide range of benefits socioeconomic scope to be employed in heavy metal compound removal in environment system.
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Affiliation(s)
- Arumugam Manikandan
- Industrial Biotechnology, Bharath Institute of Higher Education and Research, Chennai, Tamil Nadu, India
| | - Palanisamy Suresh Babu
- Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Thandalam, Chennai, Tamil Nadu, India.,Faculty of Pharmaceutical Sciences, UCSI University, Cheras, Kuala Lumpur, Malaysia
| | | | - Murugesan Kamaraj
- Department of Biotechnology, College of Biological and Chemical Engineering, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia
| | - Peraman Muthukumaran
- Department of Biotechnology, Kumaraguru College of Technology, Coimbatore, India
| | - Jeyaseelan Aravind
- Department of Civil Engineering, Environmental Research, Dhirajlal Gandhi College of Technology, Kamalapuram Sikkanampatty, Omalur, Salem, India
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11
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Filová A, Fargašová A, Molnárová M. Cu, Ni, and Zn effects on basic physiological and stress parameters of Raphidocelis subcapitata algae. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:58426-58441. [PMID: 34115300 DOI: 10.1007/s11356-021-14778-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 06/02/2021] [Indexed: 06/12/2023]
Abstract
The submitted work observed Cu, Ni, and Zn effects on selected physiological and stress parameters of the alga Raphidocelis (Pseudokirchneriella) subcapitata. In 96-h experiments, EC50 values for algal specific growth rates (SGR) inhibition in Cu, Ni, and Zn presence were estimated as 0.15, 0.50, and 0.20 mg l-1. In addition to growth inhibition, the effect of metals at various concentrations on algal SGR was also monitored. While these experiments confirmed approximately the same toxicity of Zn and Cu on SGR, Ni toxicity on this parameter was observed as the lowest. In terms of the effect of metals on the level of selected photosynthetic pigments, chlorophyll a, chlorophyll b, and carotenoids, the following inhibition orders can be established: Zn > Cu > Ni, Ni > Cu > Zn, and Ni > Cu ≥ Zn, respectively. As a novelty of our research, we included monitoring and evaluation of the intensity of stress, which was the response of algal cells to the presence of Cu, Ni, and Zn, and its correlation with respect to production factors and metal accumulation in algal cells. As stress factors, thiol (-SH) group and TBARS (thiobarbituric acid reactive substances) as significant indicators of lipid level peroxidation were determined. The content of -SH groups depended on the concentration of metal, and its level was the most stimulated by Zn, less by Cu and Ni. The TBARS content was 2 to 5 times higher in Cu than in Zn or Ni presence. In the presence of Zn and Ni, TBARS content reached approximately the same levels. For this parameter, the following rank order can be arranged: Cu >> Ni ≥ Zn. While Cu and Ni accumulation in R. subcapitata was confirmed, Zn accumulation was not determined or was below the detectable limit. Regression analyses revealed significant positive correlation between Cu accumulation and TBARS while carotenoids as possible antioxidants confirmed with TBARS mostly negative correlations.
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Affiliation(s)
- Alexandra Filová
- Department of Environmental Ecology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15, Bratislava, Slovak Republic
| | - Agáta Fargašová
- Department of Environmental Ecology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15, Bratislava, Slovak Republic
| | - Marianna Molnárová
- Department of Environmental Ecology, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovičova 6, 842 15, Bratislava, Slovak Republic.
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