I. Rico-Lattes

Paul Sabatier University - Toulouse III, Tolosa de Llenguadoc, Midi-Pyrénées, France

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Publications (46)72.19 Total impact

  • B. SEGUES, E. PEREZ, I. RICO-LATTES, M. RIVIERE, A. LATTES
    ChemInform 03/2010; 28(13).
  • J. AZEMA, C. CHEBLI, M. BON, I. RICO-LATTES, A. LATTES
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2010; 26(51).
  • I. Rico-Lattes, B. Guidetti, A. Lattes
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2010; 32(22).
  • A. LATTES, I. RICO-LATTES
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    ChemInform 01/2010; 28(38).
  • A. Lattes, I. Rico-Lattes
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    ABSTRACT: Perfluorocarbons combine high gas dissolving capacities with extreme chemical and biological inertness : they are good oxygen carriers in artificial blood and in liquid breathing. However fluorocarbons are highly hydrophobic molecules. To solve the problem of their transport, it is necessary to use the perfluorocarbons as an oil-in water emulsion (O/W). To avoid harsh treatment to form such emulsions and in order to have injectable “blood substitutes”, microemulsions seem particularly attractive since they are fluid, transparent, thermodynamically stable microheterogeneous systems. Microemulsions, contrarily to classical emulsions, are formed spontaneously by adding suitable surfactants (or a surfactant + a cosurfactant) in appropriate proportions to a non miscible mixture of water and oil. Biocompatible O/W microemulsions are difficult to obtain because 1) the existing segregation between perfluorinated and hydrogenated chains, resulting, in some cases in heterogeneities or gelation phases 2) the toxicity of some components 3) the possible harmfulness of the dispersed system, etc… We'll discuss all the parameters involved of the microemulsification process, the nature of products, the phase diagrams, and the phase behaviors. This study will outline certain guidelines necessary for the formation of microemulsions of perfluorinated (or almost completely fluorinated) oils with perfluorinated (or partially fluorinated) surfactants.
    Artificial Cells, Nanomedicine, and Biotechnology. 07/2009; 22(4).
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    ABSTRACT: The palladium (II) chloride catalyzed coupling reaction of N-alkylpyridiniumboronic acids with benzoic anhydride was carried out smoothly in water to give high yields of ketones without the use of a phosphine ligand. The reaction was conducted under mild conditions at room temperature. In this article, by focusing on the Suzuki reaction, it is shown how this method can impact modern synthetic chemistry, making reactions faster, easier and cleaner. Copyright © 2009 John Wiley & Sons, Ltd.
    Applied Organometallic Chemistry 01/2009; 23(5):191-195. · 2.01 Impact Factor
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    Sensors and Actuators B-chemical - SENSOR ACTUATOR B-CHEM. 01/2007; 126(2):710-710.
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    ABSTRACT: SAXS/WAXS studies were performed in combination with freeze fracture electron microscopy using mixtures of a new Gemini catanionic surfactant (Gem16-12, formed by two sugar groups bound by a hydrocarbon spacer with 12 carbons and two 16-carbon chains) and the zwitterionic phospholipid 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) to establish the phase diagram. Gem16-12 in water forms bilayers with the same amount of hydration water as DPPC. A frozen interdigitated phase with a low hydration number is observed below room temperature. The kinetics of the formation of this crystalline phase is very slow. Above the chain melting temperature, multilayered vesicles are formed. Mixing with DPPC produces mixed bilayers above the corresponding chain melting temperature. At room temperature, partially lamellar aggregates with local nematic order are observed. Splitting of infinite lamellae into discs is linked to immiscibility in frozen state. The ordering process is always accompanied by dehydration of the system. As a consequence, an unusual order-disorder phase transition upon cooling is observed.
    Biochimica et Biophysica Acta 12/2006; 1758(11):1797-808. · 4.66 Impact Factor
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    ABSTRACT: A new family of polycationic polynorbornene with ω-gluconamidoalkanoates and ω-lactobionamidoalkanoates as amphiphilic counterions has been prepared. These polymers spontaneously form stable latexes in water with an amphiphilic sugar corona around the particles. With these counterions, the sugar moieties are separated from the surface of latex particles by the aminoalkanoic acid residue and consequently are remote from the surface of such latexes. Such location of sugar may promote their stronger interaction with cell receptors. These original amphiphilic compartmentalized surface polycationic latexes are able to bind and efficiently complex DNA in very small complexes. Furthermore, because of the effect of the sugar corona on the formation of the complexes, there is only a slight influence of the hydrophobicity of the counterions on DNA packing.
    Colloid and Polymer Science 02/2006; 284(6):668-676. · 2.16 Impact Factor
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    ABSTRACT: 155. a Coordonnées RESUME: Synthesized hyperbranched polymers, that are chemically analogous to PAMAM dendrimers and their gluconolactone derivatives were used to prepare water 'soluble' cupper, gold, platinum and palladium nanoparticles. Complexation and reduction studies demonstrated the role of pH, polymer concentration and reduction conditions on formation and stabilisation of nanoparticles. Furthermore, when compared to PAMAM dendrimers, experiments clearly showed the effect of the macromolecular architecture on the formation of the inorganic nanoparticles. The open structure of the hyperbranched polymer compared to the dendrimer architecture facilitated the interactions of metal ions with the internal chemical functions, therefore increasing the maximum load of ions per polymer. Quite monodisperse nanoparticles of ca 4nm were indeed obtained and stabilized in solution by the hyperbranched polymer. The influence of the functionalisation of the amino end group by various functional groups was also studied.
    MATERIAUX. 01/2006;
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    ABSTRACT: A new urea biosensor for clinical applications was obtained by immobilization of urease within different latex polymers functionalized by hydroxy, acetate and lactobionate groups. Responses of these biosensors based on pH-ion-selective field effect insulator-semiconductor (IS) systems to urea additions were evaluated by capacitance measurements. UV-visible spectroscopy was used to check the urease activity in various matrixes. A good retention of the catalytic urease activity in the case of the cationic polymers was observed. In addition, rotating disk electrode experiments were carried out to determine the matrix permeability characteristics. Under optimal conditions, i.e. buffer capacity corresponding to 5 mM phosphate buffer, the urea enzyme insulator semiconductor (ENIS) sensors showed a linear response for urea concentrations in the range 10(-1.5) to 10(-4)M. Furthermore, kinetic parameters for the immobilized urease were obtained from Lineweaver-Burk plot. Clearly, a fast response and a good adhesion for the urease-acetate polymer composite films, prepared without using glutaraldehyde as cross-linking agent was observed.
    Biosensors & Bioelectronics 06/2005; 20(11):2318-23. · 6.45 Impact Factor
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    ABSTRACT: A novel approach to the synthesis of molecularly imprinted polymers via covalent or non-covalent linkages was studied. It relies on the use of thermotropic side-chain liquid-crystal polymer networks. The polysiloxane networks obtained after extraction of the template preserved the mesomorphic organisation set up in the presence of the guest molecule. Batch rebinding analysis were performed: this study revealed that the imprinted polymer has a much greater affinity for the template molecule than the unimprinted one, and a significant selectivity.
    Molecular Crystals and Liquid Crystals 01/2004; 411(1):561-568. · 0.53 Impact Factor
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    ABSTRACT: For Abstract see ChemInform Abstract in Full Text.
    ChemInform 01/2004; 35(15).
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    ABSTRACT: Monolayers at the air/water interface are used as 2D models of biological membrane to study the interaction of a new Gemini catanionic surfactant, Gem16,12, with the phospholipid DPPC. Gem16,12 is a synthetic analog of galactosylceramide (a cell receptor for HIV-1) and shows both good anti-HIV activity and low toxicity. Adsorption kinetics measurements are performed at Gemini concentrations below the critical aggregation concentration (CAC) and show a decrease of surface tension with increasing concentration. If the surface is covered with a DPPC monolayer at molecular areas with still zero surface pressure the adsorption of Gem16,12 is faster and leads to a higher surface pressure compared with the pure air/water interface. Film balance, fluorescence microscopy and grazing incidence X-ray diffraction (GIXD) experiments were performed after reaching the equilibrium surface tension. The experiments show an incorporation of Gem16,12 molecules into the fluid phase as well as into the condensed domains of a DPPC monolayer. GIXD experiments confirmed these results showing a smaller tilt angle in a DPPC monolayer on a Gemini subphase compared to DPPC on pure water. Compressing such a mixed monolayer leads first to the squeezing out of Gem16,12 molecules from the fluid part of the monolayer and above 30mN/m to the squeezing out from the condensed part.
    Colloids and Surfaces A Physicochemical and Engineering Aspects 11/2003; · 2.11 Impact Factor
  • Langmuir. 04/2002; 11(2).
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    ABSTRACT: A novel approach to the synthesis of molecularly imprinted polymers via non-covalent linkages has been studied. It relies on the use of thermotropic side group liquid crystal polymer networks. The polysiloxane networks obtained after extraction of the template preserved the mesomorphic organization set up in the presence of the guest molecule. A first batch rebinding analysis was performed: this study revealed that the imprinted polymer has a much greater affinity for the template molecule than has the non-imprinted polymer, and a significant selectivity.
    Liquid Crystals 03/2002; 29(4):529-536. · 1.96 Impact Factor
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    ABSTRACT: Receptor-mediated gene transfer is an attractive method for the targeting of DNA in specific tissues. Membrane lectins have been found at the surface of many cells and are good candidates for gene transfer by DNA-glycoconjugate complexes as specific carriers. However, to be useful for gene therapy, it is critical that the DNA be complexed and aggregated in very small particles. We describe here the properties of a new polycationic polynorbornene, with lactobionate counterions, that spontaneously forms small and stable latexes in water. Furthermore, because of lactobionate effect, the complexation with DNA lead to highly compacted aggregates with a diameter of around 10−20 nm. By the use of transmission electron microscopy, gel electrophoresis, and zeta potential measurements, we have studied both polymer organization and DNA-polymer complex formation.
    01/2002;
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    ABSTRACT: Two different biodegradable latex polymers functionalised by hydroxy (1) or gluconamide (2) groups proved to be good immobilisation matrixes for glucose oxidase. The responses of these biosensors to glucose additions were measured by potentiostating the modified electrodes at 0.6 V/SCE in order to oxidise the hydrogen peroxide generated by the enzymatic oxidation of glucose in the presence of oxygen. The response of such electrodes was evaluated as a function of film thickness, pH and temperature. Rotating disk electrode experiments showed the influence of the enzyme on the structure of both latex films, namely a marked improvement in matrix permeability. The high permeability of the latex 1 based enzyme sensor (bilayer, P(m)=8.10x10(-4) cm s(-1)) resulted in a high dynamic range. Furthermore, the activation energy for a latex 1 sensor was determined to be 44.55 and 18.03 kJ mol(-1), respectively depending on the conformation of the enzyme.
    Talanta 01/2002; 55(5):889-97. · 3.50 Impact Factor
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    ABSTRACT: The behavior of a reverse lamellar phase has been studied by small-angle X-ray scattering upon the insertion of triblock molecules. A decrease of the lamellar spacing and membrane thickness was observed, whereas the Caille exponent remained constant whatever the concentration of triblock molecules. A similar behavior was observed when surfactant molecules were added to the lamellar phase instead of triblock molecules. We demonstrate that our experimental results are consistent with the assumption that triblock molecules only participate to increase the membrane surface area. Moreover, we emphasize the fact that the surfactant molecular area varies with the membrane thickness. Indeed, this property appears to be the main effect causing the observed dramatic decrease of the lamellar spacing.
    Langmuir. 01/2002; 18(1):68-73.
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    ABSTRACT: Comb-shaped polymers greatly differ from branched poly-mers due to their larger number of side chains. The greater length of these side chains with respect to the polymer cross section grants interesting combinations of properties (for example, the autonomous behavior of the side chains and the ability of the polymer to form layered structures). Liquid-crystalline (LC) polymers [1±3] have a great potential for var-ious functional and high-performance materials [4] and can be conventionally obtained by the covalent incorporation of rigid-rodlike moieties in the side chains. A non-conventional approach to a new class of side-chain LC polymers lies in the use of non-covalent interactions to append the side chains responsible for overall mesomorphicity. Comblike complexes have been obtained by means of various intermolecular inter-actions such as dipole±dipole and ionic interactions, hydrogen bonding, or charge-transfer interactions. Comb-shaped poly-mers, such as poly(4-vinylpyridines) and poly(ethyleneim-ines), have been extensively involved in the formation of comblike complexes through hydrogen-bonding driven self-assembly with long-chain alkyl phenols or carboxylic acids. These complexes have been characterized with various analyt-ical techniques, including microscopy. [5±7] Comb-shaped polymers having perfluorocarbon (PFC) segments in the side chains have recently received interest because of their characteristic structure and properties. Due to their surface behavior [8±10] (including very low surface ener-gies), they have been widely exploited for biomedical applica-tions and for coating engineering. Moreover, their water-and oil-repellent characteristics are especially useful and have been largely exploited in the field of fiber processing. Ran-dom copolymers containing fluorinated segments are much more common than graft copolymers, because of the greater difficulties encountered in the synthesis of a two-phase graft copolymer. [11±13] Beginning from the work by the group of DeSimone, [14] novel perfluorocarbon±hydrocarbon diblock copolymers have been synthesized. Such heterophasic poly-meric systems have resulted in a variety of materials with technological promise. It has already been demonstrated that the halogen bonding is a powerful tool in crystal engineering. [15,16] Amine and pyri-dyl nitrogens atoms, [17] as well as other neutral and anionic heteroatoms, [18±20] work as effective electron donors towards the electron-poor halogen atoms of halo-PFCs. Thanks to its high strength, specificity, and directionality, halogen bonding is well tailored to overcome the very low affinity existing be-tween PFCs and hydrocarbons (HCs) and to assemble them into crystalline materials, stable in air at room temperature. In this Communication, we demonstrate how halogen bond-ing can also drive the self-assembly of long-chain halo-PFCs with HC polymers carrying appropriate electron-donor sites. Halogen bonding can thus be considered as a new intermolec-ular interaction on the disposal to the chemist for the design of new comblike complexes. The intermolecular recognition involving PFC residues with appropriate polymers through halogen bonding can be effectively pursued as an innovative approach in the coating of surfaces with fluorinated materials. To model the poly(4-vinylpyridine)/haloperfluoroalkane system, we treated 1,3-di(4-pyridyl)propane (1a; Scheme 1) with 1,8-diiodoperfluorooctane (DIPO, 3a) and 1,6-diiodoper-fluorohexane (DIPH, 3b).
    Advanced Materials 01/2002; 14(17). · 14.83 Impact Factor