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Ouyang S, Bi Z, Zhou Q. Nanocolloids in the soil environment: Transformation, transport and ecological effects. ENVIRONMENTAL RESEARCH 2024; 262:119852. [PMID: 39197486 DOI: 10.1016/j.envres.2024.119852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Revised: 08/17/2024] [Accepted: 08/25/2024] [Indexed: 09/01/2024]
Abstract
Nanocolloids (Ncs) are ubiquitous in natural systems and play a critical role in the biogeochemical cycling of trace metals and the mobility of organic pollutants. However, the environmental behavior and ecological effects of Ncs in the soil remain largely unknown. The accumulation of Ncs may have detrimental or beneficial effects on different compartments of the soil environment. This review discusses the major transformation processes (e.g., agglomeration/aggregation, absorption, deposition, dissolution, and redox reactions), transport, bioavailability of Ncs, and their roles in element cycles in soil systems. Notably, Ncs can act as effective carriers for other pollutants and contribute to environmental pollution by spreading pathogens, nutrients, heavy metals, and organic contaminants to adjacent water bodies or groundwater. Finally, the key knowledge gaps are highlighted to better predict their potential risks, and important new directions include exploring the geochemical process and mechanism of Ncs's formation; elucidating the transformation, transport, and ultimate fate of Ncs, and their long-term effect on contaminants, organisms, and elemental cycling; and identifying the impact on the growth and quality of important crops, evaluating its dominant effect on agro-ecosystems in the soil environment.
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Affiliation(s)
- Shaohu Ouyang
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Carbon Neutrality Interdisciplinary Science Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Zhicheng Bi
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Carbon Neutrality Interdisciplinary Science Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China
| | - Qixing Zhou
- Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education)/Carbon Neutrality Interdisciplinary Science Center, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
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2
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He J, Ma Y, Niu X, Pei J, Yan R, Xu F, Ma J, Ma X, Jia S, Ma W. Silver nanoparticles induce endothelial cytotoxicity through ROS-mediated mitochondria-lysosome damage and autophagy perturbation: The protective role of N-acetylcysteine. Toxicology 2024; 502:153734. [PMID: 38290605 DOI: 10.1016/j.tox.2024.153734] [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: 11/07/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/01/2024]
Abstract
Silver nanoparticles (AgNPs) are used increasingly often in the biomedical field, but their potential deleterious effects on the cardiovascular system remain to be elucidated. The primary aim of this study was to evaluate the toxic effects, and the underlying mechanisms of these effects, of AgNPs on human umbilical vein endothelial cells (HUVECs), as well as the protective role of N-acetylcysteine (NAC) against cytotoxicity induced by AgNPs. In this study, we found that exposure to AgNPs affects the morphology and function of endothelial cells which manifests as decreased cell proliferation, migration, and angiogenesis ability. Mechanistically, AgNPs can induce excessive cellular production of reactive oxygen species (ROS), leading to damage to cellular sub-organs such as mitochondria and lysosomes. More importantly, our data suggest that AgNPs causes autophagy defect, inhibits mitophagy, and finally activates the mitochondria-mediated apoptosis signaling pathway and evokes cell death. Interestingly, treatment with ROS scavenger-NAC can effectively suppress AgNP-induced endothelial damage.Our results indicate that ROS-mediated mitochondria-lysosome injury and autophagy dysfunction are potential factors of endothelial toxicity induced by AgNPs. This study may provide new evidence for the cardiovascular toxicity of AgNPs and serve as a reference for the safe use of nanoparticles(NPs) in the future.
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Affiliation(s)
- Jing He
- Department of Geriatric and Special Medicine, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China; School of Clinical Medicine, Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Yunyun Ma
- School of Clinical Medicine, Ningxia Medical University, Yinchuan 75004, Republic of China; Heart Centre, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Xudong Niu
- Yinchuan Maternity and Child Care Hospital, Yinchuan 75004, Republic of China
| | - Jiansheng Pei
- School of Clinical Medicine, Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Ru Yan
- Heart Centre, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Fangjing Xu
- School of Clinical Medicine, Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Jing Ma
- Department of Geriatric and Special Medicine, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Xiaojuan Ma
- Department of Geriatric and Special Medicine, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China
| | - Shaobin Jia
- Heart Centre, General Hospital of Ningxia Medical University, Yinchuan 75004, Republic of China.
| | - Wanrui Ma
- Department of Geriatrics, The First Dongguan Affiliated Hospital of Guangdong Medical University, Dongguan 523000, Republic of China.
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Ozturk I, Ozkul F, Topuz E. The effect of polystyrene microplastic and biosolid application on the toxicity and bioaccumulation of cadmium for Enchytraeus crypticus. INTEGRATED ENVIRONMENTAL ASSESSMENT AND MANAGEMENT 2023; 19:489-500. [PMID: 35932184 DOI: 10.1002/ieam.4667] [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: 04/14/2022] [Revised: 08/02/2022] [Accepted: 08/03/2022] [Indexed: 06/15/2023]
Abstract
Plastics smaller than 5 mm that end up in a soil environment are known as microplastics (MPs). Microplastics have become a common contaminant in agricultural areas in addition to metals. However, the effect of cadmium (Cd) on soil organisms has not been clearly defined in the presence of MPs. In addition to MPs, biosolid application as a soil amendment in agricultural lands is also leading to shifts in soil conditions, such as the concentrations of nutrients and organic matter. Therefore, the aim of this study is to investigate the toxicity and bioaccumulation of Cd for Enchytraeus crypticus in the presence of polystyrene (PS)-MPs and biosolids to provide insight into their possible interactions. The lethal toxic concentration (LC50) for Cd was higher than 650 mg Cd/kg dry soil for all conditions. The presence of PS-MPs increased the toxicity of Cd for which EC50 was 102 and 38 mg Cd/kg dry soil without and with Cd, respectively, which may be the result of an increased exposure rate through adsorption of Cd on PS-MPs. On the contrary, the presence of biosolids decreased the toxicity of Cd where EC50 was 193 and 473 mg Cd/kg dry soil for the sets applied with 0.6 and 0.9 g biosolids, respectively. Coexistence of biosolids and PS-MPs decreased the reproduction toxicity of Cd, which is similar to the biosolid effect (EC50 is 305 mg Cd/kg dry soil). Bioaccumulation of Cd only positively correlated with its initial concentration in soil and was not affected by the presence of PS-MPs or biosolids. Integr Environ Assess Manag 2023;19:489-500. © 2022 SETAC.
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Affiliation(s)
- Irem Ozturk
- Department of Environmental Engineering, Gebze Technical University, Kocaeli, Turkey
| | - Fatma Ozkul
- Department of Environmental Engineering, Gebze Technical University, Kocaeli, Turkey
| | - Emel Topuz
- Department of Environmental Engineering, Gebze Technical University, Kocaeli, Turkey
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Khodaparast Z, Loureiro S, van Gestel CAM. The effect of sulfidation and soil type on the uptake of silver nanoparticles in annelid Enchytraeus crypticus. NANOIMPACT 2022; 28:100433. [PMID: 36273810 DOI: 10.1016/j.impact.2022.100433] [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: 08/02/2022] [Revised: 10/03/2022] [Accepted: 10/14/2022] [Indexed: 06/16/2023]
Abstract
Hazard assessment of silver nanoparticles is crucial as their presence in agricultural land is increasing through sewage sludge application. This study compared the uptake and elimination kinetics in the annelid Enchytraeus crypticus of AgNPs with different core sizes and coatings in Lufa 2.2 soil, and of Ag2S NPs (simulating aged AgNPs) in three different soils. For both experiments, AgNO3 was used as ionic control. E. crypticus was exposed to soil spiked at 10 μg Ag g-1 dry soil for 14 days and then transferred to clean soil for a 14-day elimination phase. The uptake rate constants were similar for 3-8 nm and 60 nm AgNPs and AgNO3, but significantly different between 3 and 8 nm and 50 nm AgNPs. The uptake kinetics of Ag from Ag2S NPs did not significantly differ compared to pristine AgNPs. Therefore, Ag bioavailability was influenced by AgNP form and characteristics. Uptake and elimination rate constants of both Ag forms (AgNO3 and Ag2S NPs) significantly differed between different test soils (Lufa 2.2, Dorset, and Woburn). For AgNO3, significantly higher uptake and elimination rate constants were found in the Dorset soil compared to the other soils, while for Ag2S NPs this soil showed the lowest uptake and elimination rate constants. Therefore, not only the form and characteristics but also soil properties affect the bioavailability and uptake of Ag nanoparticles.
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Affiliation(s)
- Zahra Khodaparast
- CESAM-Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Susana Loureiro
- CESAM-Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Cornelis A M van Gestel
- Amsterdam Institute for Life and Environment (A-LIFE), Faculty of Science, Vrije Universiteit Amsterdam, the Netherlands
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Liang D, Fan W, Wu Y, Wang Y. Effect of organic matter on the trophic transfer of silver nanoparticles in an aquatic food chain. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129521. [PMID: 35816795 DOI: 10.1016/j.jhazmat.2022.129521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 03/08/2022] [Accepted: 06/30/2022] [Indexed: 06/15/2023]
Abstract
The behavior and toxicity of nanoparticles could be affected significantly by the ubiquitous natural organic matter (NOM) in aquatic environments. However, the influence of NOM on nanoparticles along the food chain remains largely unknown. This study constructed bacteria Escherichia coli (E. coli) - protozoa Tetrahymena thermophila (T. thermophila) to evaluate the influence of NOM on the bioaccumulation, trophic transfer and toxicity of silver nanoparticles (Ag NPs). Results demonstrated that NOM could reduce the toxicity of Ag NPs to E. coli and T. thermophila by different influence mechanisms (e.g., reduce Ag NPs accumulation or complex with dissolved silver ion (Ag+)) which related to the type of NOM and organisms. Moreover, Ag NPs can be transferred and biomagnified to T. thermophila via trophic transfer. Three typical NOM could significantly increase the trophic transfer factors of Ag NPs ranging from 1.16 to 2.49, which may be ascribed to NOM reducing the capacity for T. thermophila to excrete total silver (Ag) as NOM could significantly change the form of Ag. These findings provide a novel insight into the impact of NOM on the ecological risk posed by Ag NPs through the food chain and emphasize the need to understand further the interactions between nanoparticles and NOM in various ecosystems.
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Affiliation(s)
- Dingyuan Liang
- School of Space and Environment, Beihang University, Beijing 100191, PR China
| | - Wenhong Fan
- School of Space and Environment, Beihang University, Beijing 100191, PR China; Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing 100191, PR China
| | - You Wu
- School of Space and Environment, Beihang University, Beijing 100191, PR China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Ying Wang
- School of Space and Environment, Beihang University, Beijing 100191, PR China; Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing 100191, PR China.
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Khodaparast Z, van Gestel CAM, Verweij RA, Papadiamantis AG, Gonçalves SF, Lynch I, Loureiro S. Effects of sulfidation of silver nanoparticles on the Ag uptake kinetics in Brassica rapa plants. JOURNAL OF HAZARDOUS MATERIALS 2022; 435:128880. [PMID: 35468391 DOI: 10.1016/j.jhazmat.2022.128880] [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: 12/13/2021] [Revised: 03/30/2022] [Accepted: 04/05/2022] [Indexed: 06/14/2023]
Abstract
Land application of sewage sludge containing increasing levels of silver nanoparticles (AgNPs) raises concerns about the risk for plant exposure. This study compared the uptake kinetics and distribution of Ag in Brassica rapa seedlings grown in Lufa 2.2 natural soil spiked with 20 nm Ag2S NPs, with those from 3 to 8 nm AgNPs, 50 nm AgNPs and AgNO3 exposures (10 mg Ag/kg dry soil). A two-compartment model was used to describe the uptake kinetics of Ag in plants, distinguishing two stages: stage I with increasing Ag uptake followed by stage II with decreasing Ag uptake. The concentration of Ag in roots from Ag2S NPs was about 14 and 10 times lower than for the other AgNPs and AgNO3 exposures, respectively, at the end of stage I, with root translocation rate constants being higher for Ag2S NPs. In stage II, Ag uptake occurred only for the 50 nm AgNPs. The distribution of Ag in B. rapa exposed to pristine, ionic and sulfidized AgNPs differed at the end of exposure. This study shows that Ag uptake and distribution in plants depends on the Ag form in soil, highlighting the importance of studying the environmentally relevant chemical species in NPs risk assessment.
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Affiliation(s)
- Zahra Khodaparast
- University of Aveiro, CESAM-Centre for Environmental and Marine Studies & Department of Biology, 3810-193 Aveiro, Portugal.
| | - Cornelis A M van Gestel
- Amsterdam Institute for Life and Environment (A-LIFE), Faculty of Science, Vrije Universiteit Amsterdam, The Netherlands
| | - Rudo A Verweij
- Amsterdam Institute for Life and Environment (A-LIFE), Faculty of Science, Vrije Universiteit Amsterdam, The Netherlands
| | - Anastasios G Papadiamantis
- University of Birmingham, School of Geography, Earth and Environmental Sciences, B15 2TT Birmingham, UK; NovaMechanics Ltd., 1065 Nicosia, Cyprus
| | - Sandra F Gonçalves
- University of Aveiro, CESAM-Centre for Environmental and Marine Studies & Department of Biology, 3810-193 Aveiro, Portugal
| | - Iseult Lynch
- University of Birmingham, School of Geography, Earth and Environmental Sciences, B15 2TT Birmingham, UK
| | - Susana Loureiro
- University of Aveiro, CESAM-Centre for Environmental and Marine Studies & Department of Biology, 3810-193 Aveiro, Portugal
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Felipe MC, Bernegossi AC, Pinheiro FR, Castro GB, Moura L, Zaiat M, Corbi JJ. Counting Enchytraeus crypticus Juveniles in Chronic Exposures: An Alternative Method for Ecotoxicity Studies Using Tropical Artificial Soil. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2021; 107:494-499. [PMID: 34269820 PMCID: PMC8284039 DOI: 10.1007/s00128-021-03330-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 06/28/2021] [Indexed: 05/04/2023]
Abstract
Soil toxicity tests are commonly applied using Enchytraeus crypticus to analyze reproductive outputs. However, the traditional method for counting potworms takes a long time due to the significant number of offspring. This paper compares the conventional total counting of E. crypticus juveniles (M1) and an alternative methodology (M2). The proposed methodology (M2) uses a simple random counting method (1/4) for the partial counting of juveniles and total estimation. Chronic bioassays (21 days of exposure) were performed in tropical artificial soil (TAS) using sugarcane vinasse as a hazardous substance. Comparing the final density of juveniles recorded in M1 and M2, no statistical differences were pointed out in either one. Applying analyses based on effective concentration (EC10 and EC50), no statistical differences were identified there either. The t-test showed that there was no statistical difference between the counting methods (M1 and M2) in each treatment (control and dilutions). Moreover, we ran the Tukey test for M1 and M2 methods separately and observed that 100 % of the vinasse showed a statistical difference compared to the control treatment in both (p ≤ 0.05), affirming that independent of the counting method, the ecotoxicological outputs were similar. Therefore, the proposed alternative is a suitable method for bioassay using. E. crypticus in tropical artificial soil, decreasing to 1/4 the total time required for counting.
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Affiliation(s)
- Mayara C Felipe
- Biological Processes Laboratory (LPB), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil.
| | - Aline C Bernegossi
- Aquatic Ecology Laboratory (LEAA), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
| | - Fernanda R Pinheiro
- Aquatic Ecology Laboratory (LEAA), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
| | - Gleyson B Castro
- Aquatic Ecology Laboratory (LEAA), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
| | - Lidia Moura
- Aquatic Ecology Laboratory (LEAA), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
| | - Marcelo Zaiat
- Biological Processes Laboratory (LPB), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
| | - Juliano J Corbi
- Aquatic Ecology Laboratory (LEAA), Department of Hydraulic and Sanitation, São Carlos School of Engineering (EESC), University of São Paulo (USP), Av. João Dagnone, 1100, Santa Angelina, São Carlos, Brazil
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Bicho RC, Faustino AMR, Carvalho F, Soares AMVM, Scott-Fordsmand JJ, Amorim MJB. Embryotoxicity of silver nanomaterials (Ag NM300k) in the soil invertebrate Enchytraeus crypticus - Functional assay detects Ca channels shutdown. NANOIMPACT 2021; 21:100300. [PMID: 35559787 DOI: 10.1016/j.impact.2021.100300] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/21/2021] [Accepted: 01/22/2021] [Indexed: 06/15/2023]
Abstract
Despite that silver (Ag) is among the most studied nanomaterials (NM) in environmental species and Ag's embryotoxicity is well known, there are no studies on Ag NMs embryotoxicity in soil invertebrates. Previous Full Life Cycle (FLC) studies in Enchytraeus crypticus, a standard soil invertebrate, showed that Ag materials decreased hatching success, which was confirmed to be a hatching delay effect for silver nitrate (AgNO3) and mortality for Ag NM300K. In the present study, we aimed to investigate if the impact of Ag takes place during the embryonic development, using histology and immunohistochemistry. E. crypticus cocoons were exposed to a range of concentrations of Ag NM300K (0-10-20-60-115 mg Ag/kg) and AgNO3 (0-20-45-60-96 mg Ag/kg) in LUFA 2.2 soil, in an embryotoxicity test, being sampled at days 1, 2, 3 and 6 (3, 4, 5 and 7 days after cocoon laying). Measured endpoints included the number of embryonic structures, expression of transferrin receptor (TfR) and L type calcium channels (LTCC) through histological and immunohistochemistry analysis, respectively. Results confirmed that Ag materials affected the embryonic development, specifically at the blastula stage (day 3). The expression and localization of TfR in E. crypticus was shown in the teloblasts cells, although this transcytosis mechanism was not activated. Ag affected calcium (Ca) metabolism during embryonic development: for AgNO3, LTCC was initially activated, compensating the impact, for Ag NM300K, LTCC was not activated, hence no Ca balance, with irreversible consequences, i.e. terminated embryonic development. An Adverse Outcome Pathway was drafted, integrating the mechanisms here discovered with previous knowledge.
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Affiliation(s)
- Rita C Bicho
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Augusto M R Faustino
- Department of Pathology and Molecular Immunology, Biomedical Sciences Institute of Abel Salazar, University of Porto, 4050-313 Porto, Portugal
| | - Fátima Carvalho
- Department of Pathology and Molecular Immunology, Biomedical Sciences Institute of Abel Salazar, University of Porto, 4050-313 Porto, Portugal
| | - Amadeu M V M Soares
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Janeck J Scott-Fordsmand
- Department of Bioscience, Aarhus University, Vejlsovej 25, PO BOX 314, DK-8600 Silkeborg, Denmark
| | - Mónica J B Amorim
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
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Bretti C, Cardiano P, Irto A, Lando G, Milea D, Sammartano S. Interaction of N-acetyl-l-cysteine with Na +, Ca 2+, Mg 2+ and Zn 2+. Thermodynamic aspects, chemical speciation and sequestering ability in natural fluids. J Mol Liq 2020; 319:114164. [PMID: 32904480 PMCID: PMC7455796 DOI: 10.1016/j.molliq.2020.114164] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/23/2020] [Accepted: 08/27/2020] [Indexed: 11/24/2022]
Abstract
The estimation of thermodynamic parameters of N-Acetyl-L-cysteine (NAC) protonation were determined in NaCl(aq), (CH3)4NCl(aq), (C2H5)4NI(aq), employing various temperature and ionic strengths conditions, by potentiometric measurements. The interaction of NAC with some essential metal cations (e.g., Ca2+, Mg2+ and Zn2+) was investigated as well at 298.15 K in NaCl(aq) in the ionic strength range 0.1 ≤ I/mol dm-3 ≤ 1.0. The values of protonation constants at infinite dilution and at T = 298.15 K are: log K 1 H = 9.962 ± 0.005 (S-H) and log K 2 H = 3.347 ± 0.008 (COO-H). In the presence of a background electrolyte, both log K 1 H and log K 2 H values followed the trend (C2H5)4NI ≥ (CH3)4NCl ≥ NaCl. The differences in the values of protonation constants among the three ionic media were interpreted in terms of variation of activity coefficients and formation of weak complexes. Accordingly, the determination of the stability of 4 species, namely: NaL-, NaHL0 (aq), (CH3)4NL-, (CH3)4NHL0 (aq) was assessed. In addition, as regards the interactions of Mg2+, Ca2+ and Zn2+ with NAC, the main species where the ML0 (aq), ML(OH)-, and ML2 2-, that were found to be important in the chemical speciation of NAC in real multicomponent solutions. The whole set of the data collected may be crucial for the development of NAC-based materials for natural fluids selective decontamination from heavy metals.
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Affiliation(s)
- Clemente Bretti
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Paola Cardiano
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Anna Irto
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Gabriele Lando
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Demetrio Milea
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
| | - Silvio Sammartano
- Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, Università di Messina, Viale Ferdinando Stagno d'Alcontres 31, 98166 Messina, Italy
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