Academic literature on the topic 'Polymères à empreintes'
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Journal articles on the topic "Polymères à empreintes"
Hugon-Chapuis, Florence, and Valérie Pichon. "Polymères à empreintes moléculaires pour l'extraction sélective de composés de milieux biologiques." Annales de Toxicologie Analytique 19, no. 3 (2007): 239–51. http://dx.doi.org/10.1051/ata:2007028.
Full textFourati, Najla, and Chouki Zerrouki. "Microbalances à quartz et polymères à empreintes moléculaires pour la détection d’espèces chimiques. état de l’art de 2010 à 2013." Instrumentation Mesure Métrologie 13, no. 3-4 (December 30, 2013): 9–37. http://dx.doi.org/10.3166/i2m.13.3-4.9-37.
Full textDissertations / Theses on the topic "Polymères à empreintes"
Cadinot, Mélanie. "Nouveaux procédés d'élaboration de polymères à empreintes moléculaires." Phd thesis, INSA de Rouen, 2008. http://tel.archives-ouvertes.fr/tel-00558785.
Full textLe, Foll Alexandra. "Polymères à empreintes moléculaires : nouveaux outils prometteurs pour la synthèse organique." Thesis, Rouen, INSA, 2010. http://www.theses.fr/2010ISAM0006.
Full textThis work deals with the use of molecular imprinting technology for the design of new tools in organic sythesis. First, we studied the potential of MIPs in organocatalysis through activation in the imprints. For this purpose, several thiourea-cinchona alkaloid derivatives have been prepared so as to be introduced in the polymer cavities. The use of different MIPs synthesised with these polymerisable catalysts in Henry reaction did not show any advantageous effect on reaction rate or enantioselectivity. Secondly, we have prformed the development of a strategy for separation and recovery of a wide range of compounds by relating tag technology with molecular imprinting. Efficiency and selectivity of MIP-Tag for in triazole series have been demonstrated. Tagged tyrosine has been selectively extracted from an amino-acid mixture. Then, the application of this Tag technology for the recovery of pybox and proline catalyst was investigated. Finally, we have demonstrated the efficiency of our process for the removal of triphenylphosphine oxide formed during a Mitsunobu reaction. The removal of 99% of tagged phosphine oxide was perforrmed by the purification of a reaction medium in SPE by means of MIP-Tag
Griffete, Nebewia. "Cristaux photoniques et polymères à empreintes moléculaires pour la détection optique de polluants." Paris 7, 2011. http://www.theses.fr/2011PA077105.
Full textVery recent years have shown great improvements in the field of molecularly imprinted polymers (MIPs), biomimetic Systems able to selectively recognize a target molecule. Another emerging domain in full expansion is the development of photonic crystals based on highly organized colloïdal particle networks, with the possibility to immobilize them within polymer films: the selective etching of the particles provides 3D-ordered interconnected macroporous structure, called inverse opals. In this PhD, we have combined these two promising concepts (molecular imprinting and photonic crystals in order to elaborate an original self-reporting sensing film exhibiting high sensitivity and selectivity. We have adopted the Langmuir-Blodgett method to form colloïdal silica crystals as templates in combination with the molecular-imprinting technique to prepare highly ordered 3D macroporous hydrogel films (of polymethacrylic acid). The resulting porous material contains both specific molecular recognition nanocavities for bisphenol A and a periodic variation of the dielectric constant which generates a readable optical signal directly (self-reporting) upon binding' the target analyte without the need for labeling. We focused particularly on the optimisation of the optical response of the photonic crystals towards external stimuli (such as pH changes or variation of the BPA concentration) by introducing active defect layer within the materials. Two kinds of defect layers were studied: (i) planar defects made of the same material as the host crystal but varying by the particle size; (ii) planar defects made of a chemically different material, consisting in ferric oxide nanoparticles covered by a molecularly imprinted polymer overlayer (NP@MIP)
Sahun, Maxime. "Développement d'un capteur à base de polymère à empreintes moléculaires pour la quantification de la sphingosine 1-phosphate libre et circulante comme biomarqueur du mélanome cutané." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30242/document.
Full textMelanoma is the most aggressive and severe form of cutaneous cancer due to its high metastatic potential. However, to date, no marker for the early detection of melanoma has been unanimously accepted. Our group has demonstrated that ceramide metabolism is strongly altered in melanoma, leading to the overproduction of sphingosine 1-phosphate (S1P), one of its derivatives. S1P is secreted by melanoma cells and has been identified as a critical molecule of tumor microenvironment remodeling that supports cancer progression. Physiologically, circulating S1P is predominantly linked to high density lipoproteins (HDLs), low and very low density lipoproteins (LDLs and VLDLs), as well as albumin. Melanoma cells produce unbound S1P that could be responsible for the effects induced by this lysophospholipid on the tumor microenvironment, as a result of its binding to S1PR receptors present on the surface of stromal cells. Thus, secreted tumor S1P could represent a new biomarker for the early detection of melanoma. However, there are currently no means to quantify it. The goal of this interdisciplinary work was to develop a new sensor based on a Molecularly Imprinted Polymer (MIP) in order to quantify unbound S1P present in the blood of melanoma patients. This study has been conducted between the "Engineering for Life science Applications (EliA)" group at the Laboratory for Analysis and Architecture of Systems (LAAS) and the "Sphingolipids, metabolism, cell death and tumor progression" group at the Cancer Research Center of Toulouse (CRCT), in strong collaboration with the team "Biomimetism and Bioinspired Structures" of the University of Technology of Compiègne (UTC). First, we synthesized a new MIP against S1P employing a bulk thermopolymerization approach. The resulting MIP was characterized and optimized by performing both mass spectrometry and fluorescence spectroscopy measurements. It was compared to a Non Imprinted Polymer (NIP) and exposed to S1P analogues to assess its selectivity. Second, in order to use the MIP as the sensitive layer of a future sensor and prepare its immobilization and structuration onto a transducer, we synthesized a new surface photopolymerizable MIP. This MIP was first structured by photolithography onto silicon substrates and validated by fluorescence microscopy measurements. The MIP was also structured as a thin layer onto Quartz Crystal Microbalance (QCM) chips in order to validate its binding capacities using this label-free method. Finally, the use of a MIP-coated optical fiber as an infrared sensor was explored, with the aim of detecting S1P in blood using Attenuated Total Reflectance (ATR) spectroscopy
Fuchs, Yannick. "Capteurs chimiques holographiques à base de polymères à empreintes moléculaires comme éléments de reconnaissance." Compiègne, 2012. http://www.theses.fr/2012COMP2037.
Full textMolecularly imprinted polymers (MIPs) are tailor-made synthetic receptors capable of specifically recognizing a target molecule. They are synthesized by polymerization of a complex between functional monomers and a template molecule in the presence of cross-linkers. After polymerization and removal of the template molecule, the cross-linked polymer network contains cavities that are complementary to the template in terms of size, shape, and position of functional groups, allowing the polymer to bind target analytes with high affinity and specificity. The work reported in this thesis is focused on the development of MIP-based holographic sensors, a novel group of optical sensors in which MIPs is used as recognition element, and the holographic element is built into it and used as an optical transducer. Label-free binding assays performed with holographic sensors showed the optical signal being specifically modified upon incubation in testosterone solutions. This is due to structural modifications that occur in the MIP matrix upon analyte binding, which consequently give rise to structural changes. Testosterone concentrations as low as 1 µM could thus be detected. The combination of holographic transducers with MIPs as synthetic recognition elements has the potential to give rise to inexpensive general sensing devices that can be adapted to, and used in, a broad range of sensing tasks, without the need of labeling the analyte. These range from the highly sensitive spectrometric sensor to the instrument-less test strip, and should be of interest for industry, biomedical, environmental and food, end even for household use
Henry, Nathaly. "Conception de polymères à empreintes moléculaires pour l'extraction de principes actifs de produits naturels." Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2028/document.
Full textThe cosmetic industry uses plants as sources of natural active ingredients. The extraction of theseactive ingredients requires selective extraction method such as molecularly imprinted polymers (MIP)technique. This thesis describes the development of MIP for the selective extraction of glucosamine,fructosazine and 2,5-déoxyfructosazine.In the first part, three approaches were developed to extract glucosamine by MIP technique: thecovalent approach, semi-covalent and noncovalent. For each approach, the various parametersinvolved in the synthesis of the MIP were optimized. The best results were obtained with a MIPsynthesized with a non-covalent ionic approach based on the complexation of glucosamine by asulfonic acid. The MIP exhibits higher performance than commercial media and extractions fromplants were performed. The potential for industrialization of the MIP was validated during initial testson a larger scale.In the second part, the simultaneous extraction of fructosazine and 2,5-déoxyfructosazine wasperformed following the development of a MIP synthesized using a covalent approach based on theformation of boronic esters. An original synthesis method is exposed since the templates were formedin situ during the polymerization. The MIP obtained showed good selectivity for each compound andallowed to separate and purify fructosazine and 2,5-déoxyfructosazine from plant and food matrices.All these works were performed according to an eco-friendly approach based on the use of aqueoussolvents as solvents for polymerization and extraction
Moussa, Manel. "Développement de polymères à empreintes ioniques pour l'extraction sélective des lanthanides dans des échantillons environnementaux." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066585/document.
Full textThe analysis of the lanthanide ions present at trace level in complex environmental matrices requires often a purification and preconcentration step. The solid phase extraction (SPE) is the most used sample preparation technique. To improve the selectivity of this step, Ion Imprinted Polymers (IIPs) can be used as SPE solid supports. The aim of this work was the development of IIPs for the selective extraction of lanthanide ions from environmental samples. In a first part, IIPs were prepared according to the trapping approach using 5,7-dichloroquinoline-8-ol as non-vinylated ligand. For the first time, the loss of the trapped ligand during template ion removal and sedimentation steps was demonstrated by HPLC-UV. Moreover, this loss was not repeatable, which led to a lack of repeatability of the SPE profiles. It was then demonstrated that the trapping approach is not appropriate for the IIPs synthesis.In a second part, IIPs were synthesized by chemical immobilization of methacrylic acid as vinylated monomer. The repeatability of the synthesis and the SPE protocol were confirmed. A good selectivity of the IIPs for all the lanthanide ions was obtained. IIPs were successfully used to selectively extract lanthanide ions from tap and river water. Finally, IIPs were synthesized by chemical immobilization of methacrylic acid and 4-vinylpyridine as functional monomers and either a light (Nd3+) or a heavy (Er3+) lanthanide ion as template. Both kinds of IIPs led to a similar selectivity for all lanthanide ions. Nevertheless, this selectivity can be modified by changing the nature and the pH of the washing solution used in the SPE protocol
Hadj, Ali Wassim. "Polymères à empreintes moléculaires pour l'extraction de l'ochratoxine A des matrices alimentaires : caractérisation et miniaturisation." Paris 6, 2011. http://www.theses.fr/2011PA066803.
Full textSala, Alexandre. "Synthèse et caractérisation de polymères à empreintes ionique du cuivre pour la conception d'électrodes modifiées." Electronic Thesis or Diss., Toulon, 2022. http://www.theses.fr/2022TOUL0010.
Full textThe use of copper as a biocide in anti-fouling coatings on ships has led to its accumulation in harbour waters. The aim of this work is to develop electrochemical sensors for its detection in marine samples. For this purpose, copper(II)-imprinted polymers were prepared and used for the modification of electrodes.Firstly, imprinted polymer particles were synthesised using a cross-linking agent (ethylene glycol dimethacrylate or N,N'-methylene-bis-acrylamide) and a functional monomer, methacrylamido-L-histidine (MAH), which can form a complex with copper(II). The physico-chemical characterization of the polymer particles confirmed the integration of MAH and allowed to evaluate the morphological properties of the polymers.The copper(II) binding properties were then evaluated and the particles with the best performance were used to make carbon paste electrodes. These electrodes, with a detection limit of 5.9 x 10-2 μM (or 3.75 μg/L), allowed the determination of copper(II) in marine samples.Finally, new approaches for surface modification were explored for in situ polymer film formation. Thus, iniferters were grafted onto gold electrodes by the formation of self-assembled monolayers but also by electropolymerisation of a polymer with pendant iniferter functions. The latter route allowed the photopolymerisation of a copper(II)-imprinted polymer film on a carbon electrode
Vandevelde, Fanny. "Matériaux nanostructurés à empreintes moléculaires : Récepteurs biomimétiques pour des biocapteurs." Compiègne, 2007. http://www.theses.fr/2007COMP1703.
Full textMolecularly imprinted polymers (MIPs) represent a novel type of bioinspired materials that mimic the behaviour of natural antibodies, enzymes or receptors, while exhibiting far greater stability than their natural counterparts. Their usefulness has no more to be demonstrated for applications in bioanalytical chemistry such as immunoassays or biosensors. Coupling silicon-based microfabricated structures with MIPs used as sensitive layer appears particularly interesting since that combines the binding selectivity of the MIPs with a high-sensitivity and high-resolution transduction mechanism eliminating the need of labelling. We describe, in this study, a MIP-based label-free sensing system for the herbicide 2,4-dicWorophenoxyacetic acid (2,4-0) is validated using piezoelectric micro-membranes working in dynamic mode. The MIP precursor solution containing the template molecule 2,4-0 and a corresponding non-imprinted polymer (NIP) precursor solution without 2,4-0 as a control were deposited on the membranes using a specific cantilever array-based microspotting technique. We describe the preparation of nanostructured molecularly-imprinted surfaces using nanomolding on porous alumina. This approach produces snrface-bound nanofilaments, which greatly increases the surface area of the material and should result in a faster mass transfer compared to porous films. Two different approaches were chosen : imprinting of the bulk filaments, and imprinting of the filament surface. For the bulk and surface imprinting, we used the blocking drug propranolol and the dye fluorescein, respectively, as the target molecules (the imprinting templates). Rebinding studies performed with the imprinted surfaces and with non-imprinted control surfaces revealed a specific recognition of the templates and thus the existence of selective molecularly imprinted binding sites
Books on the topic "Polymères à empreintes"
1967-, Yan Mingdi, and Ramström Olof, eds. Molecularly imprinted materials: Science and technology. New York: Marcel Dekker, 2005.
Find full textKallay, Nikola, Mingdi Yan, and Olaf Ranstrom. Molecularly Imprinted Materials: Science and Technology. Taylor & Francis Group, 2010.
Find full textHandbook of Molecularly Imprinted Polymers. Smithers Rapra Technology, 2013.
Find full textYe, Lei. Molecular Imprinting: Principles and Applications of Micro- and Nanostructure Polymers. Jenny Stanford Publishing, 2016.
Find full textYe, Lei. Molecular Imprinting: Principles and Applications of Micro- and Nanostructure Polymers. Jenny Stanford Publishing, 2016.
Find full textBook chapters on the topic "Polymères à empreintes"
Betatache, Amina, Nicole Jaffrezic-Renault, and Florence Lagarde. "Capteur biomimétique à base de polymère à empreinte moléculaire pour la détection impédimétrique de la testostérone." In Instrumentation et Interdisciplinarité, 387–92. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6-049.
Full textBetatache, Amina, Nicole Jaffrezic-Renault, and Florence Lagarde. "Capteur biomimétique à base de polymère à empreinte moléculaire pour la détection impédimétrique de la testostérone." In Instrumentation et Interdisciplinarité, 387–92. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-1206-6.c049.
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