Letteratura scientifica selezionata sul tema "Di(2-Éthylhexyle) phtalate"
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Articoli di riviste sul tema "Di(2-Éthylhexyle) phtalate"
B. E., Olatundun, Osaiyuwu O. H., Mbaba E. N. e Ogunlade J. T. "Effect of di-(2-ethylhexyl) phthalate on growth performance, organ weight and carcass characteristics of rabbit bucks". Nigerian Journal of Animal Production 50, n. 2 (28 febbraio 2024): 16–24. http://dx.doi.org/10.51791/njap.v50i2.3957.
Testo completoTesi sul tema "Di(2-Éthylhexyle) phtalate"
Paluselli, Andrea. "Analysis, occurence, release and degradation of phthalate esters (PAEs) in Mediterranean coastal sea". Electronic Thesis or Diss., Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0060.
Testo completoPhthalic Acid Esters (PAEs) are a group of emerging organic contaminants that have become a serious issue because of their ubiquitous presence on the marine environment worldwide and for the endocrine disrupting effects in animals and humans. However, little is known about their distribution in the Ocean, mainly because of analytical difficulties and the high possibility of ambient sample contamination. Plastic debris in marine environment includes resin pellets, macro- and microplastic fragments, and contains additives such as PAEs that might be released in the aquatic environment in unknown proportion. In our work, we improved an analytical method for the determination of 8 PAEs, at trace levels in marine and fresh waters. In the first part of the thesis, the method was validated for different seawater salinities and wastewater treatment plant outlet. By passing 1 L of sample through glass cartridges packed with 200 mg of Oasis HLB and eluted with 6 mL of ethyl acetate, the recoveries of 8 PAEs ranged from 95 to 115 % with acceptable blank values (below 0.4-4.0 % of the masses measured in different seawater samples). In a second part, PAE distribution in the Marseille Bay has been evaluated though a one-year monitoring from December 2013 to November 2014. The results showed the occurrence of six PAEs with total concentrations ranging from 130 to 1330 ng L-1. In the last part of this thesis, two common plastic samples as trash plastic bags and insulation layer of electric cables were incubated in natural seawater in laboratory conditions and studied for the release of PAE. Release ws observed for the different PAEs with kinetics varying according to the plastic type
Rivas, Johanna. "Impact de la mixture du Bisphénol A et Di(2-éthylhexyle) phtalate, deux potentiels Perturbateurs Endocriniens, sur un invertébré terrestre : la noctuelle du coton Spodoptera littoralis". Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASB026.
Testo completoIn the plastic era, the massive production along with the inadequate management of these polymers led to their accumulation in numerous ecosystems. Plastics are composed of a large diversity of additives which are not chemically bound to the plastic polymer, leading to their release into the environment.In this work, we focused on Bisphenol A (BPA) and Di(2-ethylhexyl) phthalate (DEHP). These compounds have accumulated in various environmental compartments and agroecosystems, and were also reported from living organisms.BPA and DEHP are proven Endocrine Disrupting Chemicals (EDCs) in humans and vertebrates. Surprisingly, few studies examined the effects of these potential EDCs on terrestrial invertebrates, despite their ecological significance. Some works reported the effects of EDCs on the endocrine system, physiology, and development of invertebrates. Yet, few articles investigated the impacts at environmental doses on invertebrates, or explored the impacts of the BPA and DEHP mixture on invertebrates. Moreover, much of the knowledge is focused on aquatic invertebrates and there is little information on the effects of EDC on terrestrial invertebrates, notably in agroecosystems.In this context, this PhD thesis focused on the impact of environmental doses of BPA and DEHP, alone or in mixture, on the cotton leafworm Spodoptera littoralis, a crop pest known in agriculture.First, we developed a chemical method to extract and quantify BPA, DEHP, and its metabolite, Mono(2-ethylhexyl) phthalate (MEHP), from the leaves of tomato plants. Our first results showed that DEHP was ubiquitous, unlike BPA and MEHP. Additionally, MEHP levels were lower in plants exposed to BPA and DEHP.Next, S. littoralis larvae were experimentally exposed to EDCs, either by being provided tomato leaves from plants contaminated by root watering with BPA and/or DEHP, or by being provided contaminated laboratory food with BPA and/or DEHP. Post-embryonic development and metabolic profiling were studied for both exposure types. The impacts on the endocrine system and glycolysis of S. littoralis were investigated for individuals fed with laboratory food.Our results showed differences of alterations depending on the ingestion mode, and differences between mono-exposures and mixture with complex interactions, sometimes antagonistic or additive.Finally, we demonstrated that the impact of BPA and/or DEHP could be sex-specific, regardless of the exposure mode and life stage of the insect. We recommend to include this parameter in future studies on EDCs in invertebrates, particularly for the study of potential transgenerational effects
Bechohra, Imane. "Élimination des Composés Organiques Volatils hydrophobes par couplage de l’absorption et de la biodégradation : absorption dans un solvant organique biodégradable". Rennes, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCR0025.
Testo completoRemoval of hydrophobic volatile organic compounds (VOCs), such as toluene, by biological way is limited by the step of absorption in the aqueous phase (containing the microbial agents). In order to overcome this lock, an organic solvent has been added, serving as absorbent, in the multiphase bioreactor. This apolar phase can be expensive and / or regeneration is difficult to implement. The choice of a "waste-solvent" was therefore considered. The choice of this solvent was performed based on different criteria, such as the ability to absorb the target compound (partition coefficient), a low solubility in water, a biodegradability, and a biocompatibility towards microorganisms. Three organic solvents were tested: hexadecane as a model solvent, waste frying oil and di (2-ethylhexyl) phthalate (DEHP) or dioctyl phthalate. Biodegradation tests were conducted in batch (250 mL Erlenmeyer flasks fitted with specific sampling systems). The results obtained with the solvent model allowed to consider the use of biodegradable organic solvent in partition reactors (TPPB). Indeed, the target VOC could be treated simultaneously in the presence of hexadecane at 5% by volume in water by activated sludge from a wastewater treatment plant. In contrast, in the case of waste frying oil (HFU), toluene was not completely consumed at the end of the culture. Even after acclimation of microorganisms, low VOC degradation rates and HFU were obtained. In contrast, the results obtained with DEHP, conceivable solvent waste, have been promising. Indeed, a biodegradation of toluene, rapid and greater than in the presence of hexadecane, was observed. An optimization of the volume fraction of DEHP in water was thus performed, and the influence of the initial concentration in toluene was investigated. A ratio of 0. 1% of DEHP in water and a toluene concentration of 106 mg. L-1 were selected as optimal conditions. Tests on this system were then carried out in a 3 Liter semi-continuous bioreactor containing of non-acclimated activated sludge, then acclimated to two substrates (VOCs and DEHP). These have allowed to limit losses toluene encountered in batch (in flasks) and to validate the viability of the process. The toluene biodegradation rate was significant (9. 8 mg. L-1. H-1) and the rate of degradation of DEHP was 89%
Paluselli, Andrea. "Analysis, occurence, release and degradation of phthalate esters (PAEs) in Mediterranean coastal sea". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0060/document.
Testo completoPhthalic Acid Esters (PAEs) are a group of emerging organic contaminants that have become a serious issue because of their ubiquitous presence on the marine environment worldwide and for the endocrine disrupting effects in animals and humans. However, little is known about their distribution in the Ocean, mainly because of analytical difficulties and the high possibility of ambient sample contamination. Plastic debris in marine environment includes resin pellets, macro- and microplastic fragments, and contains additives such as PAEs that might be released in the aquatic environment in unknown proportion. In our work, we improved an analytical method for the determination of 8 PAEs, at trace levels in marine and fresh waters. In the first part of the thesis, the method was validated for different seawater salinities and wastewater treatment plant outlet. By passing 1 L of sample through glass cartridges packed with 200 mg of Oasis HLB and eluted with 6 mL of ethyl acetate, the recoveries of 8 PAEs ranged from 95 to 115 % with acceptable blank values (below 0.4-4.0 % of the masses measured in different seawater samples). In a second part, PAE distribution in the Marseille Bay has been evaluated though a one-year monitoring from December 2013 to November 2014. The results showed the occurrence of six PAEs with total concentrations ranging from 130 to 1330 ng L-1. In the last part of this thesis, two common plastic samples as trash plastic bags and insulation layer of electric cables were incubated in natural seawater in laboratory conditions and studied for the release of PAE. Release ws observed for the different PAEs with kinetics varying according to the plastic type
Wakx, Anaïs. "Etude de nouveaux biomarqueurs de toxicité induite par des micropolluants (benzo(a)pyrène et phtalate de bis(2-ethylhexyle)) sur des modèles de placenta humain". Thesis, Paris 5, 2014. http://www.theses.fr/2014PA05P620/document.
Testo completoPrenatal exposure to pollutants is commonly evaluated using placenta as a barrier between mother and fetus. Here, we consider placenta as a target organ for toxic agents. To achieve this, we selected a trophoblastic cell model, which is adapted to toxicological studies. In clinical studies, pregnancy pathologies are associated to changes in human placental lactogen (hPL) and human chorionic gonadotropin (hCG) secretions. Our in vitro work links exposure to micropollutants (mono(2-ethylhexyl)phthalate, an endocrine disruptor, and benzo(a)pyrene, a carcinogen) and clinical observations. We identified biomarkers of hormonal secretion (hPL and hyperglycosylated hCG) and degeneration (P2X7 receptor activation), which enable the evaluation of exposure and risk attached to exposure to pollutants