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Gil da Costa RM, Povey A, Medeiros-Fonseca B, Ramwell C, O'Driscoll C, Williams D, Hansen HCB, Rasmussen LH, Fletcher MT, O'Connor P, Bradshaw RHW, Robinson R, Mason J. Sixty years of research on bracken fern (Pteridium spp.) toxins: Environmental exposure, health risks and recommendations for bracken fern control. ENVIRONMENTAL RESEARCH 2024; 257:119274. [PMID: 38821456 DOI: 10.1016/j.envres.2024.119274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 05/07/2024] [Accepted: 05/28/2024] [Indexed: 06/02/2024]
Abstract
Bracken fern (Pteridium spp.) is a highly problematic plant worldwide due to its toxicity in combination with invasive properties on former farmland, in deforested areas and on disturbed natural habitats. The carcinogenic potential of bracken ferns has caused scientific and public concern for six decades. Its genotoxic effects are linked to illudane-type glycosides (ITGs), their aglycons and derivatives. Ptaquiloside is considered the dominating ITG, but with significant contributions from other ITGs. The present review aims to compile evidence regarding environmental pollution by bracken fern ITGs, in the context of their human and animal health implications. The ITG content in bracken fern exhibits substantial spatial, temporal, and chemotaxonomic variation. Consumption of bracken fern as food is linked to human gastric cancer but also causes urinary bladder cancers in bovines browsing on bracken. Genotoxic metabolites are found in milk and meat from bracken fed animals. ITG exposure may also take place via contaminated water with recent data pointing to concentrations at microgram/L-level following rain events. Airborne ITG-exposure from spores and dust has also been documented. ITGs may synergize with major biological and environmental carcinogens like papillomaviruses and Helicobacter pylori to induce cancer, revealing novel instances of chemical and biological co-carcinogenesis. Thus, the emerging landscape from six decades of bracken research points towards a global environmental problem with increasingly complex health implications.
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Affiliation(s)
- Rui M Gil da Costa
- Department od Morphology, Federal University of Maranhão (UFMA), São Luís, 65080-805, Brazil; Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE), Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal; Associate Laboratory in Chemical Engineering (ALiCE), Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal; Molecular Oncology and Viral Pathology Group, Research Center of IPO Porto (CI-IPOP) / RISE@CI-IPOP (Health Research Network), Portuguese Oncology Institute of Porto (IPO Porto) / Porto Comprehensive Cancer Center (Porto.CCC), 4200-072, Porto, Portugal; Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), Institute for Innovation, Capacity Building and Sustainability of Agri-Food Production (Inov4Agro), 5001-801, Vila Real, Portugal.
| | - Andrew Povey
- Centre for Occupational and Environmental Health, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PL, UK
| | - Beatriz Medeiros-Fonseca
- Molecular Oncology and Viral Pathology Group, Research Center of IPO Porto (CI-IPOP) / RISE@CI-IPOP (Health Research Network), Portuguese Oncology Institute of Porto (IPO Porto) / Porto Comprehensive Cancer Center (Porto.CCC), 4200-072, Porto, Portugal; Centre for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB), Institute for Innovation, Capacity Building and Sustainability of Agri-Food Production (Inov4Agro), 5001-801, Vila Real, Portugal
| | - Carmel Ramwell
- Fera Science Ltd, York Biotech Campus, Sand Hutton, York, YO41 1LZ, UK
| | - Connie O'Driscoll
- Ryan Hanley Consulting Engineers Ltd., 1 Galway Business Park, Dangan, Galway, H91 A3EF, Ireland
| | - David Williams
- Centre for Chemical Biology, Department of Chemistry, Sheffield Institute for Nucleic Acids, University of Sheffield, Sheffield, S3 7HF, UK
| | - Hans Chr B Hansen
- University of Copenhagen, Department of Plant and Environmental Sciences, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Lars Holm Rasmussen
- Novonesis, Microbe & Culture Research, Bøge Allé 10-12, DK- 2970, Hørsholm, Denmark
| | - Mary T Fletcher
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Health, and Food Science Precinct, 39 Kessels Road, Coopers Plains, QLD, 4108, Australia
| | - Peter O'Connor
- Centre for Occupational and Environmental Health, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, M13 9PL, UK
| | - Richard H W Bradshaw
- Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, L69 7ZT, UK
| | | | - James Mason
- School of Biochemistry and Immunology, Trinity College Dublin, Ireland
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2
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García-Jorgensen DB, Holbak M, Hansen HCB, Abrahamsen P, Diamantopoulos E. Modeling the environmental fate of bracken toxin ptaquiloside: Production, release and transport in the rhizosphere. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 921:170658. [PMID: 38340825 DOI: 10.1016/j.scitotenv.2024.170658] [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: 10/08/2023] [Revised: 01/31/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024]
Abstract
Plants produce a diverse array of toxic compounds which may be released by precipitation, explaining their wide occurrence in surrounding soil and water. This study presents the first mechanistic model for describing the generation and environmental fate of a natural toxin, i.e. ptaquiloside (PTA), a carcinogenic phytotoxin produced by bracken fern (Pteridium aquilinum L. Kuhn). The newly adapted DAISY model was calibrated based on two-year monitoring performed in the period 2018-2019 in a Danish bracken population located in a forest glade. Several functions related to the fate of PTA were calibrated, covering processes from toxin generation in the canopy, wash off by precipitation and degradation in the soil. Model results show a good description of observed bracken biomass and PTA contents, supporting the assumption that toxin production can be explained by the production of new biomass. Model results show that only 4.4 % of the PTA produced in bracken is washed off by precipitation, from both canopy and litter. Model simulations showed that PTA degrades rapidly once in the soil, especially during summer due to the high soil temperatures. Leaching takes place in form of pulses directly connected to precipitation events, with maximum simulated concentrations up to 4.39 μg L-1 at 50 cm depth. Macropore transport is mainly responsible for the events with the highest PTA concentrations, contributing to 72 % of the total mass of PTA leached. Based on the results, we identify areas with high density of bracken, high precipitation during the summer and soils characterized by fast transport, as the most vulnerable to surface and groundwater pollution by phytotoxins.
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Affiliation(s)
- Daniel B García-Jorgensen
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark; National Food Institute, Technical University of Denmark, Kongens Lyngby, Denmark.
| | - Maja Holbak
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | | | - Per Abrahamsen
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Efstathios Diamantopoulos
- Department of Plant and Environmental Sciences, University of Copenhagen, Frederiksberg, Denmark; Chair of Soil Physics, University of Bayreuth, Bayreuth, Germany
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3
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Panda D, Dash BP, Manickam S, Boczkaj G. Recent advancements in LC-MS based analysis of biotoxins: Present and future challenges. MASS SPECTROMETRY REVIEWS 2022; 41:766-803. [PMID: 33624883 DOI: 10.1002/mas.21689] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 02/03/2021] [Accepted: 02/05/2021] [Indexed: 06/12/2023]
Abstract
There has been a rising concern regarding the harmful impact of biotoxins, source of origin, and the determination of the specific type of toxin. With numerous reports on their extensive spread, biotoxins pose a critical challenge to figure out their parent groups, metabolites, and concentration. In that aspect, liquid chromatography-mass spectrometry (LC-MS) based analysis paves the way for its accurate identification and quantification. The biotoxins are ideally categorized as phytotoxins, mycotoxins, shellfish-toxins, ciguatoxins, cyanotoxins, and bacterial toxins such as tetrodotoxins. Considering the diverse nature of biotoxins, both low-resolution mass spectrometry (LRMS) and high-resolution mass spectrometry (HRMS) methods have been implemented for their detection. The sample preparation strategy for complex matrix usually includes "QuEChERS" extraction or solid-phase extraction coupled with homogenization and centrifugation. For targeted analysis of biotoxins, the LRMS consisting of a tandem mass spectrometer operating in multiple reaction monitoring mode has been widely implemented. With the help of the reference standard, most of the toxins were accurately quantified. At the same time, the suspect screening and nontarget screening approach are facilitated by the HRMS platforms during the absence of reference standards. Significant progress has also been made in sampling device employment, utilizing novel sample preparation strategies, synthesizing toxin standards, employing hybrid MS platforms, and the associated data interpretation. This critical review attempts to elucidate the progress in LC-MS based analysis in the determination of biotoxins while pointing out major challenges and suggestions for future development.
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Affiliation(s)
- Debabrata Panda
- Center of Excellence (CoE), Fakir Mohan University, Nuapadhi, Odisha, India
| | - Bisnu P Dash
- Department of Bioscience and Biotechnology, Fakir Mohan University, Nuapadhi, Odisha, India
| | - Sivakumar Manickam
- Petroleum and Chemical Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan, Brunei Darussalam
| | - Grzegorz Boczkaj
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, Gdańsk, Poland
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Kisielius V, Drejer M, Dornhoff JK, Mrkajic NS, Lindqvist DN, Hansen HCB, Rasmussen LH. Occurrence and stability of ptesculentoside, caudatoside and ptaquiloside in surface waters. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2022; 24:277-289. [PMID: 35043811 DOI: 10.1039/d1em00364j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The illudane glycosides ptesculentoside (PTE), caudatoside (CAU) and ptaquiloside (PTA) are found in bracken ferns (Pteridium sp.). PTA is known to contaminate water bodies adjacent to bracken ferns and hence contribute to water toxicity. This study for the first time reports the presence of PTE and CAU in surface waters with concentrations up to 5.3 μg L-1 and outlines their stability under semi-natural conditions using water of two diverse lakes at their natural pH or pH adjusted to 6.5, with temperature controlled at 5 or 15 °C, and in the presence or absence of microbial activity. Under the same set of tested conditions the three illudane glycosides degraded at similar rates: with half-lives of approximately two days at pH 7.4 and 15 °C, and approximately 12 days at pH 5.2-6.5 and 5 °C. The water origin had significant influence on the degradation rates, but only due to its difference in pH. In most cases, the degradation rates of all the three illudane glycosides could be predicted using the existing first-order model for PTA hydrolysis. As PTE and CAU exhibit the same leaching pattern and stability as PTA, previous predictions of bracken environmental impact are likely underestimated, as PTE and CAU have not been monitored and included in the risk assessment.
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Affiliation(s)
- Vaidotas Kisielius
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
| | - Mikkel Drejer
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
| | - Jimmy Kjellerup Dornhoff
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
| | - Natasa Skrbic Mrkajic
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
- Greater Copenhagen Utility HOFOR, Ørestads Boulevard 35, 2300 Copenhagen, Denmark
| | - Dan Nybro Lindqvist
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
| | - Hans Christian Bruun Hansen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Lars Holm Rasmussen
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
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Mrkajic NS, Hama JR, Strobel BW, Hansen HCB, Rasmussen LH, Pedersen AK, Christensen SCB, Hedegaard MJ. Removal of phytotoxins in filter sand used for drinking water treatment. WATER RESEARCH 2021; 205:117610. [PMID: 34649082 PMCID: PMC8556162 DOI: 10.1016/j.watres.2021.117610] [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: 01/21/2021] [Revised: 08/20/2021] [Accepted: 08/23/2021] [Indexed: 06/06/2023]
Abstract
Phytotoxins - toxins produced by plants - are contaminants with the potential to impair drinking water quality. They encompass a large group of toxic, partially persistent compounds that have been detected in seepage waters and in shallow wells used for drinking water production. If phytotoxins enter wells used for drinking water production, it is essential to know if the drinking water treatment processes will remove them from the water phase. However, it is currently unknown whether phytotoxins remain stable during traditional groundwater treatment using sand filters as the main treatment process. The objective of this study is to investigate removal potential of phytotoxins in biological sand filters and to asses if the removal potential is similar at different waterworks. Microcosms were set up with filter sand and drinking water collected at different groundwater-based waterworks. To be able to monitor phytotoxin removal ptaquiloside, caudatoside, gramine, sparteine, jacobine N-oxide, senecionine N-oxide and caffeine were applied at initial concentrations of 300 µg L-1, which is approx. two orders of magnitude higher than currently detected in environment, but expected to cover extreme environmental conditions. Removal was monitored over a period of 14 days. Despite the high initial concentration, all filter sands removed ptaquiloside and caudatoside completely from the water phase and at waterworks where pellet softening was implemented (pH 8.4) prior to rapid sand filtration, complete removal occurred within the first 30 min. All filter sands removed gramine and sparteine, primarily by a biological process, while jacobine N-oxide, senecionine N-oxide and caffeine were recalcitrant in the filter sands. During degradation of ptaquiloside and caudatoside we observed formation and subsequent removal of degradation products pterosin B and A. Filter sands with the highest removal potential were characterised by high contents of deposited iron and manganese oxides and hence large specific surface areas. Difference between bacterial communities investigated by 16S rRNA gene analyses did not explain different removal in the filter sands. All five investigated filter sands showed similar degradation patterns regardless of water chemistry and waterworks of origin. In drinking water treatment systems biological sand filters might therefore remove phytotoxin contaminants such as ptaquiloside, caudatoside, gramine, sparteine, while for other compounds e.g. jacobine N-oxide, senecionine N-oxide further investigations involving more advanced treatment options are needed.
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Affiliation(s)
- Natasa Skrbic Mrkajic
- Greater Copenhagen Utility HOFOR, Parkstien 10, 2450, Copenhagen, Denmark; Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
| | - Jawameer R Hama
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
| | - Bjarne W Strobel
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
| | - Hans Chr B Hansen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
| | - Lars Holm Rasmussen
- Department of Technology, University College Copenhagen, Sigurdsgade 26, 2200 Copenhagen, Denmark
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Hama JR, Kolpin DW, LeFevre GH, Hubbard LE, Powers MM, Strobel BW. Exposure and Transport of Alkaloids and Phytoestrogens from Soybeans to Agricultural Soils and Streams in the Midwestern United States. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:11029-11039. [PMID: 34342221 DOI: 10.1021/acs.est.1c01477] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Phytotoxins are naturally produced toxins with potencies similar/higher than many anthropogenic micropollutants. Nevertheless, little is known regarding their environmental fate and off-field transport to streams. To fill this research gap, a network of six basins in the Midwestern United States with substantial soybean production was selected for the study. Stream water (n = 110), soybean plant tissues (n = 8), and soil samples (n = 16) were analyzed for 12 phytotoxins (5 alkaloids and 7 phytoestrogens) and 2 widely used herbicides (atrazine and metolachlor). Overall, at least 1 phytotoxin was detected in 82% of the samples, with as many as 11 phytotoxins detected in a single sample (median = 5), with a concentration range from below detection to 37 and 68 ng/L for alkaloids and phytoestrogens, respectively. In contrast, the herbicides were ubiquitously detected at substantially higher concentrations (atrazine: 99% and metolachlor: 83%; the concentrations range from below detection to 150 and 410 ng/L, respectively). There was an apparent seasonal pattern for phytotoxins, where occurrence prior to and during harvest season (September to November) and during the snow melt season (March) was higher than that in December-January. Runoff events increased phytotoxin and herbicide concentrations compared to those in base-flow conditions. Phytotoxin plant concentrations were orders of magnitude higher compared to those measured in soil and streams. These results demonstrate the potential exposure of aquatic and terrestrial organisms to soybean-derived phytotoxins.
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Affiliation(s)
- Jawameer R Hama
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark
| | - Dana W Kolpin
- U.S. Geological Survey, Central Midwest Water Science Center, 400 South Clinton Street, Iowa City, Iowa 52240, United States
| | - Gregory H LeFevre
- Department of Civil and Environmental Engineering and IIHR-Hydroscience and Engineering, University of Iowa, 4105 Seamans Center, Iowa City, Iowa 52242, United States
| | - Laura E Hubbard
- U.S. Geological Survey, Upper Midwest Water Science Center, 8505 Research Way, Middleton, Wisconsin 53562, United States
| | - Megan M Powers
- Department of Civil and Environmental Engineering and IIHR-Hydroscience and Engineering, University of Iowa, 4105 Seamans Center, Iowa City, Iowa 52242, United States
| | - Bjarne W Strobel
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, Frederiksberg 1871, Denmark
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Hama JR, Strobel BW. Occurrence of pyrrolizidine alkaloids in ragwort plants, soils and surface waters at the field scale in grassland. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 755:142822. [PMID: 33348479 DOI: 10.1016/j.scitotenv.2020.142822] [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: 04/23/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 06/12/2023]
Abstract
Pyrrolizidine alkaloids (PA)s are natural toxins produced by a variety of plants including ragwort. The PAs present a serious health risk to human and livestock. Although these compounds have been extensively studied in food and feed, little is known regarding their environmental fate. To fill this data gap, we investigated the occurrence of PAs in ragwort plants, soils and surface waters at three locations where ragwort was the dominant plant species to better understand their environmental distribution. The concentrations of PAs were quantified during the full growing season (April-November) and assessed in relation to rain events. PA concentrations ranged from 3.2-6.6 g/kg dry weight (dw) in plants, 0.8-4.0 mg/kg dw in soils, and 6.0-529 μg/L in surface waters. Maximum PA concentrations in the soil (4 mg/kg) and water (529 μg/L) were in mid-May just before flowering. The average distribution of PAs in water was approximately 5 g/10,000 L, compared to the average amounts present in ragwort (506 kg/ha), and soil (1.7 kg/ha). In general, concentrations of PAs increase in the soil and surface water following rain events.
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Affiliation(s)
- Jawameer R Hama
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Bjarne W Strobel
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark
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8
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A Novel Method for Determination of the Natural Toxin Ptaquiloside in Ground and Drinking Water. WATER 2020. [DOI: 10.3390/w12102852] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Ptaquiloside (PTA) is a carcinogenic compound naturally occurring in bracken ferns (Pteridium aquilinum). It is highly water soluble and prone to leaching from topsoil to surface and groundwaters. Due to possible human exposure via drinking water, PTA is considered as an emerging contaminant. We present a sensitive and robust method for analysis of PTA and its degradation product pterosin B (PtB) in groundwater. The method comprises two steps: sample preservation at the field site followed by sample pre-concentration in the laboratory. The preservation step was developed by applying a Plackett–Burman experimental design testing the following variables: water type, pH, filtering, bottle type, storage temperature, transportation conditions and test time. The best sample preservation was obtained by using amber glass bottles, unfiltered solutions buffered at pH 6, transported without ice, stored at 4 °C and analysed within 48 h. The recovery was 94% to 100%. The sample purification step had a pre-concentration factor of 250, and the recovery percentages of the entire method were 85 ± 2 (PTA) and 91 ± 3 (PtB). The limits of detection (LOD) of the full method were 0.001 µg L−1 and 0.0001 µg L−1 for PTA and PtB, respectively. The method enables sensitive monitoring of PTA and PtB in groundwater. Carcinogenic PTA was detected in one groundwater well (0.35 µg L−1).
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9
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García-Jorgensen DB, Hansen HCB, Abrahamsen P, Diamantopoulos E. A novel model concept for modelling the leaching of natural toxins: results for the case of ptaquiloside. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2020; 22:1768-1779. [PMID: 32716437 DOI: 10.1039/d0em00182a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phytotoxins are a large class of highly diverse emerging environmental contaminants that have been detected at high concentrations in plants, water and soils. This study presents a novel modelling approach for assessing the fate of plant toxins in the soil-plant-atmosphere continuum, developed for the specific case of ptaquiloside (PTA), a carcinogenic phytotoxin produced by Pteridium aquilinum. The mechanistic model DAISY has been adapted for reproducing phytotoxin dynamics in plants, covering processes such as toxin generation in the canopy, wash off by precipitation and toxin recovery in the canopy after depletion events. Transport of the toxin in the soil was simulated by the advection-dispersion equation assuming weak sorption and degradation for two Danish soils. The model simulates realistic toxin contents in the plant during the growing season, where the actual PTA content is dynamic and a function of the biomass. An average of 48% of the PTA produced in the canopy is washed off by precipitation, with loads in the soil often in the order of mg m-2 and up to a maximum of 13 mg m-2 in a single rain event. Degradation in the soil removes 99.9% of the total PTA input to the soil, while only 0.1% leaches into the soil. The median annual flux-averaged predicted environmental concentrations during single events are often in the order of μg L-1, reaching up to 60 μg L-1 for the worst-case scenario. The simulated results for both degradation and wash off are of the same order of magnitude as the published data. Based on the results, we conclude that DAISY, with the newly implemented processes, is a useful tool for understanding, describing and predicting the fate of PTA in the soil. Further work comparing the model results with real data is needed for the calibration and validation of the model.
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Affiliation(s)
- D B García-Jorgensen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
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10
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Ehlers BK, Berg MP, Staudt M, Holmstrup M, Glasius M, Ellers J, Tomiolo S, Madsen RB, Slotsbo S, Penuelas J. Plant Secondary Compounds in Soil and Their Role in Belowground Species Interactions. Trends Ecol Evol 2020; 35:716-730. [PMID: 32414604 DOI: 10.1016/j.tree.2020.04.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 11/24/2022]
Abstract
Knowledge of the effect of plant secondary compounds (PSCs) on belowground interactions in the more diffuse community of species living outside the rhizosphere is sparse compared with what we know about how PSCs affect aboveground interactions. We illustrate here that PSCs from foliar tissue, root exudates, and leaf litter effectively influence such belowground plant-plant, plant-microorganism, and plant-soil invertebrate interactions. Climatic factors can induce PSC production and select for different plant chemical types. Therefore, climate change can alter both quantitative and qualitative PSC production, and how these compounds move in the soil. This can change the soil chemical environment, with cascading effects on both the ecology and evolution of belowground species interactions and, ultimately, soil functioning.
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Affiliation(s)
- Bodil K Ehlers
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Matty P Berg
- Community and Conservation Ecology Group, Groningen Institute of Evolutionary Life Sciences, University of Groningen, Nijenborgh 7, 9747, AG, Groningen, The Netherlands; Department of Ecological Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081, HV, Amsterdam, The Netherlands
| | - Michael Staudt
- CEFE, CNRS, Univ Montpellier, Univ Paul Valéry Montpellier 3, EPHE, IRD, 1919 Route de Mende, 34293 Montpellier, France
| | - Martin Holmstrup
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Marianne Glasius
- Department of Chemistry and Interdisciplinary Nanoscience Center, Langelandsgade 140, 8000 Århus, Denmark
| | - Jacintha Ellers
- Department of Ecological Science, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081, HV, Amsterdam, The Netherlands
| | - Sara Tomiolo
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark; Plant Ecology Group, Institute for Evolution and Ecology, Tübingen University, Auf der Morgenstelle 5, 72076 Tübingen, Germany
| | - René B Madsen
- Department of Chemistry and Interdisciplinary Nanoscience Center, Langelandsgade 140, 8000 Århus, Denmark
| | - Stine Slotsbo
- Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmark
| | - Josep Penuelas
- CSIC, Global Ecology Unit CREAF-CSIC-UAB, 08193 Bellaterra, Catalonia, Spain; CREAF, 08193 Cerdanyola del Vallès, Catalonia, Spain.
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11
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Fast LC-MS quantification of ptesculentoside, caudatoside, ptaquiloside and corresponding pterosins in bracken ferns. J Chromatogr B Analyt Technol Biomed Life Sci 2020; 1138:121966. [DOI: 10.1016/j.jchromb.2019.121966] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 12/29/2019] [Accepted: 12/30/2019] [Indexed: 12/13/2022]
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Jiang X, Strobel BW, Cedergreen N, Cao Y, Hansen HCB. Stability of saponin biopesticides: hydrolysis in aqueous solutions and lake waters. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2019; 21:1204-1214. [PMID: 31241099 DOI: 10.1039/c9em00012g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Saponins form a group of plant-produced glycosides with potential as biopesticide ingredients. The environmental fate of saponins has never been fully investigated. In the present study, we use QS-18, a specific saponin from Quillaja saponaria as an example, to quantify hydrolysis under different conditions of pH, temperature and water chemical composition. Saponin hydrolysis in buffer solutions was base-catalyzed and followed first-order kinetics. Thus, hydrolysis was slow at pH 5.1 with a half-life of 330 ± 220 d (26 °C), which increases to 0.06 ± 0.01 d at pH 10.0. Hydrolysis rates were highly sensitive to temperature with an activation energy of 56.9 ± 14.2 kJ mol-1 at pH 7.2. In strong contrast, hydrolysis in lake waters (pH 6.4-8.2) produced different patterns with a fast initial dissipation of 25 to 60% of the added saponin within the first five hours, followed by an extremely slow reaction with 25 to 75% unreacted saponin left after reaction times longer than 120 h. The fast dissipation followed by slow hydrolysis in lake water was hypothesized to be attributed to sorption and/or flocculation of saponins by inorganic nanoparticles and/or solutes in the lake water followed by inactivation of hydrolysis due to the sorption/flocculation. The present study demonstrates that saponins may hydrolyze slowly under acidic and cold conditions. In addition, it demonstrates that dissipation kinetics in natural waters may deviate substantially from the kinetics predicted based on laboratory experiments with "clean" buffered solutions. This emphasizes the need for a deeper understanding of the processes affecting the dissipation kinetics of potential toxins under natural conditions, as fate models based on laboratory derived kinetic data may be seriously flawed.
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Affiliation(s)
- Xiaogang Jiang
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Bjarne W Strobel
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Nina Cedergreen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Yi Cao
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
| | - Hans Chr Bruun Hansen
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg, Denmark.
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Picardo M, Filatova D, Nuñez O, Farré M. Recent advances in the detection of natural toxins in freshwater environments. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2018.12.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Milligan G, Booth KE, Cox ES, Pakeman RJ, Le Duc MG, Connor L, Blackbird S, Marrs RH. Change to ecosystem properties through changing the dominant species: Impact of Pteridium aquilinum-control and heathland restoration treatments on selected soil properties. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 207:1-9. [PMID: 29149640 DOI: 10.1016/j.jenvman.2017.11.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 11/03/2017] [Accepted: 11/05/2017] [Indexed: 05/16/2023]
Abstract
It is well known that soils are influenced by the plant species that grow in them. Here we consider the effects of management-induced changes to plant communities and their soils during restoration within a 20-year manipulative experiment where the aim was to change a late-successional community dominated by the weed, Pteridium aquilinum, to an earlier-successional grass-heath one. The ecological restoration treatments altered the above- and below-ground components of the community substantially. Untreated plots maintained a dense Pteridium cover with little understory vegetation, cutting treatments produce significant reductions of Pteridium, whereas herbicide (asulam) produced significant immediate reductions in Pteridium but regressed towards the untreated plots within 10 years. Thereafter, all asulam-treated plots were re-treated in year 11, and then were spot-sprayed annually. Both cutting and asulam treatments reduced frond density to almost zero and resulted in a grass-heath vegetation. There was also a massive change in biomass distribution, untreated plots had a large above-ground biomass/necromass that was much reduced where Pteridium was controlled. Below-ground in treated plots, there was a replacement of the substantive Pteridium rhizome mass with a much greater root mass of other species. The combined effects of Pteridium-control and restoration treatment, reduced soil total C and N as and available P concentrations, but increased soil pH and available N. Soil biological activity was also affected with a reduction in soil N mineralization rate, but an increased soil-root respiration. Multivariate analysis showed a clear trend along a pH/organic matter gradient, with movement along it correlated to management intensity from the untreated plots with low pH/high organic matter and treated plots with to a higher pH/lower organic matter in the sequence asulam treatment, cut once per year to cut twice per year. The role that these changed soil conditions might have in restricting Pteridium recovery are discussed.
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Affiliation(s)
- G Milligan
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - K E Booth
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - E S Cox
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - R J Pakeman
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - M G Le Duc
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - L Connor
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - S Blackbird
- School of Environmental Sciences, University of Liverpool, Liverpool, UK
| | - R H Marrs
- School of Environmental Sciences, University of Liverpool, Liverpool, UK.
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Personal Care Products Are Only One of Many Exposure Routes of Natural Toxic Substances to Humans and the Environment. COSMETICS 2018. [DOI: 10.3390/cosmetics5010010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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