Tesis sobre el tema "Microemulsioni"
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Pandey, Sujata. "Design, Optimization and Characterization of Ibuprofen Microemulsions and Microemulsion-Based Gels". University of Toledo Health Science Campus / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=mco158894431613094.
Texto completoBellich, Barbara. "Preparazione e caratterizzazione di forme farmaceutiche solide orali a partire da materiale composito". Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2568.
Texto completoLa somministrazione per via orale è la preferita per il trattamento farmacologico cronico. Circa il 40% dei nuovi principi attivi, tra i quali numerosi potenti farmaci lipofilici, è caratterizzato da bassa solubilità in acqua e la somministrazione per via orale di tali farmaci è frequentemente associata a bassa biodisponibilità. Infatti l’assorbimento di un principio attivo rilasciato da una forma farmaceutica orale dipende essenzialmente da due fattori: la dissoluzione del p.a. nel tratto gastrointestinale e la sua permeabilità attraverso la mucosa. Sulla base di questi due parametri i principi attivi sono stati distinti in quattro classi (Biopharmaceutical Classification System). In particolare per la seconda classe di composti, la dissoluzione nel lume gastro-intestinale è lo step limitante il processo di assorbimento. Per questa classe, numerosi approcci tecnologici sono riportati in letteratura allo scopo di aumentare la biodisponibilità orale di farmaci lipofilici come per esempio l’incorporazione in veicoli lipidici inerti come olii, la formulazione di sistemi auto-emulsificanti, di emulsioni e microemulsioni, liposomi, complessi di inclusione e sistemi dispersi farmaco-carrier. Rispetto a tali metodi convenzionali, il lavoro svolto ha riguardato la preparazione di sistemi attivati a base di ubidecarenone e ciclosporina ricorrendo alla tecnologia NEC (Nanoemulsified Composites) in collaborazione con la ditta Remedia s.r.l. titolare della tecnologia brevettata. La tecnologia NEC si basa sull’incorporazione di una doppia microemulsione (o/a/o) in un carrier microporoso. Successivamente l’attenzione è stata focalizzata sull’innovativa applicabilità delle microonde alla preparazione di sistemi binari farmaco:carrier. Il riscaldamento per mezzo delle microonde sfrutta le proprietà che le sostanze chimiche hanno di assorbire l’energia direttamente dalle onde elettromagnetiche le quali sono in grado di aumentare l’agitazione termica, e quindi la temperatura. L’energia fornita dalle radiazioni viene ceduta direttamente alla sostanza ed in tempi molto brevi. Tutte le sostanze caratterizzate da un dipolo, anche minimo, possono assorbire microonde. In tale contesto, oggetto della ricerca è stata l’attivazione dell’ibuprofene e piroxicam. Per tutti i farmaci considerati è stato inizialmente effettuato uno studio di messa a punto delle sostanze e delle condizioni operative ottimali, atte a fornire un prodotto finale lavorabile (prodotto composito). Alla preparazione dei sistemi ha fatto seguito la caratterizzazione chimico-fisica, necessaria per appurare lo stato solido del principio attivo. In particolare le tecniche adottate sono state: calorimetria a scansione differenziale (DSC), raggi X su polvere (PXRD), microscopia elettronica (SEM), hotstage microscopi (HSM), laser-light scattering. Successivamente le formulazioni approntate sono state caratterizzate anche dal punto di vista tecnologico e dissolutivo in termini di studi di cinetica di solubilizzazione e di rilascio. Inoltre in alcuni casi il prodotto è stato testato in vivo su ratti. Ed è stata anche valutata, in alcuni casi, la possibilità di realizzare forme farmaceutiche solide ad uso orale quali capsule e compresse. I risultati ottenuti sono qui di seguito riassunti. UBIDECARENONE La tecnologia preparativa adottata unitamente alla selezione dei componenti, hanno dimostrato il raggiungimento dell’obiettivo del presente lavoro e cioè l’aumento della biodisponibilità in vivo dell’Ubidecarenone. Le caratteristiche tecnologiche del materiale composito hanno permesso un’agevole realizzazione di capsule rigide ma, con un’ulteriore selezione di eccipienti per compressione diretta, si potrà realizzare anche la forma di dosaggio in compresse. CICLOSPORINA Il prodotto composito preparato è dunque risultato essere in grado di aumentare la biodisponibilità in vivo della ciclosporina rispetto alla materia prima commerciale. IBUPROFENE Dai risultati ottenuti si può concludere che la tecnica utilizzata e i polimeri scelti hanno portato ad un grado di amorfizzazione del farmaco tale da essere responsabile dell’incremento del profilo di dissoluzione in vitro delle dispersioni solide (IBU:PVP/VA e IBU: HP-β-CD) rispetto ai campioni di confronto. PIROXICAM Anche in questo studio è stato possibile verificare l’applicabilità delle MW alla creazione di sistemi dispersi solvent-free. Gli indiscussi vantaggi al ricorso ad un reattore a MW focalizzate (CEM) in termini di tempi e potenze applicate sono stati verificati. Il raggiungimento dell’obiettivo del lavoro e cioè l’aumento della biodisponibilità in vitro del piroxicam è stato ottenuto associando alla tecnologia adottata il polimero PVP/VA 64.
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Taylor, Diana Jacqueline Falcon. "Temperature insensitive microemulsions". Thesis, University of Hull, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310404.
Texto completoMertzman, Melissa Danielle Foley Joe Preston. "Chiral microemulsion electrokinetic chromatography /". Philadelphia, Pa. : Drexel University, 2004. http://dspace.library.drexel.edu/handle/1860/340.
Texto completoKahle, Kimberly Ann Foley Joe Preston. "Effect of identity and number of chiral microemulsion components in chiral microemulsion electrokinetic chromatography /". Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/1293.
Texto completoMemon, Muhammad Hanif. "Microemulsions as analytical reaction media". Thesis, University of Hull, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235839.
Texto completoMead, J. "Structure and reactivity in microemulsions". Thesis, University of Kent, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355149.
Texto completoSteudle, Anne Katharina. "Enzyme activity in bicontinuous microemulsions". Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11178/.
Texto completoBiggs, Simon Richard. "Block copolymers in microemulsion systems". Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303769.
Texto completoRadiman, Shahidan. "Structural characterisation of microemulsion systems". Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333282.
Texto completoMarcus, Julien [Verfasser] y Werner [Akademischer Betreuer] Kunz. "Study of surfactant-free microemulsions and microemulsions with fatty acid salts / Julien Marcus. Betreuer: Werner Kunz". Regensburg : Universitätsbibliothek Regensburg, 2016. http://d-nb.info/1081543353/34.
Texto completoAkhtar, Mahmood. "Microemulsions formation, stability and their characterisations". Thesis, Brunel University, 1996. http://bura.brunel.ac.uk/handle/2438/5004.
Texto completoBillman, John Frederick. "Structure and phase behavior in microemulsions /". Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/9825.
Texto completoHusein, Maen. "Nucleophilic sulfonation in microemulsions and emulsions". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36814.
Texto completoA single-pseudophase and a three-pseudophase model described the sulfonation of decyl halides and benzyl halides, respectively. The three new assumptions employed in the model are: (1) the volume of the interfacial region varies only with the amount of surfactant added, (2) the oil-soluble reactant may be unavailable for reaction if there is insufficient surfactant to bind all of the decyl halide to the interface, or insufficient mixing to eliminate the benzyl halide phase, and (3) a single ion exchange constant accounts for the exchange of three different anions at the interface.
Dowding, Peter John. "Characterisation of microemulsions containing silicone oils". Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309956.
Texto completoSvensson, B. Martin. "Lipase catalysis in lecithin-stabilised microemulsions". Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406836.
Texto completoWarisnoicharoen, Warangkana. "Pharmaceutical nonionic oil-in-water microemulsions". Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286790.
Texto completoPeter, Ulrike. "Extremely diluted microemulsions : structure and dynamics". Bordeaux 1, 2000. http://www.theses.fr/2000BOR1A001.
Texto completoPleines, Maximilian. "Viscosity-control and prediction of microemulsions". Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS139.
Texto completoViscosity is a fundamental property of complex fluids that is still nowadays extremely difficult to predict quantitatively. This macroscopic property originates from molecular and mesoscopic properties. The understanding and prediction of the evolution of the viscosity with changing parameters is crucial for several applications, amongst others for liquid-liquid extraction processes and for formulation of aqueous surfactant systems.In this work, a “minimal” model taking into account the relevant free energies was developed that helps to understand, control and predict the evolution of the viscosity of microemulsions in presence of solutes. The term “minimal” means in that context that this model is based on a minimal set of parameters that are all measurable and have a physical meaning, thus avoiding input of any adjustable parameter. This model that considers the chemical terms at molecular scale, the physical terms at meso-scale as well as the flow characteristics at macroscale was applied on water-poor extracting microemulsions as well as on aqueous anionic surfactant systems
Atkinson, Peter J. "Characterisation of microemulsion-based organo-gels". Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292227.
Texto completoRees, Gareth David. "Lipase catalysis in microemulsion-based systems". Thesis, University of East Anglia, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236927.
Texto completoThorpe, Matthew Robert. "Microemulsion formation in 1,1,1,2-tetrafluoroethane (R134a)". Thesis, University of East Anglia, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410249.
Texto completoGalal, M. F. "Studies of micellar and microemulsion media". Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374302.
Texto completoNicholson, Catherine Emma. "Crystallisation in emulsion and microemulsion systems". Thesis, Durham University, 2006. http://etheses.dur.ac.uk/1298/.
Texto completoShoop, Brian H. "Applications of sugar-based microemulsion glasses". Cincinnati, Ohio : University of Cincinnati, 2009. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1258661949.
Texto completoAdvisor: Chia-Chi Ho. Title from electronic thesis title page (viewed Feb. 19, 2010). Includes abstract. Keywords: Microemulsion; Sucrose Ester; Sodium Citrate; Glass; Template; Polymerization. Includes bibliographical references.
Girard, Nathalie Renee Claude. "Oil-in-water microemulsions and their polymerization". Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369502.
Texto completoLankford, William Timothy. "The toxicity and pharmacokinetics of pyrethroid microemulsions". Thesis, Nottingham Trent University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384861.
Texto completoAboofazeli, Reza. "The formation and characterization of phospholipid microemulsions". Thesis, King's College London (University of London), 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307045.
Texto completoHalliday, Nicola Ann. "Magnetic resonance investigations of pH in microemulsions". Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1407/.
Texto completoYan, Ci. "Surfactant films in water-in-CO₂ microemulsions". Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.682365.
Texto completoNiemann, Björn. "Population dynamics of nanoparticle precipitation in microemulsions". Magdeburg Docupoint-Verl, 2009. http://d-nb.info/998665185/04.
Texto completoYildiz, Ünveren Hesna Hülya. "Hydroformylation of long chain olefins in microemulsion". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=972892109.
Texto completoMutch, Kevin James. "Microemulsion-polymer mixtures in the protein limit". Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500413.
Texto completoMcDonald, J. A. "Phase behaviour and structure in microemulsion dispersions". Thesis, University of Kent, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375055.
Texto completoShukla, Anuj. "Characterization of microemulsions using small angle scattering techniques". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969395817.
Texto completoHussain, Arshad. "Phase behaviour of microemulsions for enhanced oil recovery". Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/8492.
Texto completoKrauel, Karen y n/a. "Formulation and characterisation of nanoparticles from biocompatible microemulsions". University of Otago. School of Pharmacy, 2005. http://adt.otago.ac.nz./public/adt-NZDU20070424.130711.
Texto completoHetherington, Karen J. "Properties of microemulsions formed with di-chained surfactants". Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245512.
Texto completoBinks, Daniel Anthony. "Magnetic resonance studies of chemical reactions in microemulsions". Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/573/.
Texto completoCook, Oliver James. "Control of crystallisation through the use of microemulsions". Thesis, Durham University, 2012. http://etheses.dur.ac.uk/7301/.
Texto completoBeckford, Elaine Susan. "Low frequency dielectric spectroscopic analysis of reverse microemulsions". Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/low-frequency-dielectric-spectroscopic-analysis-of-reverse-microemulsions(28476252-5e4e-4c14-9d33-ce070394a5e5).html.
Texto completoZheng, Guanyu. "Bioremediation of organochlorine pesticides contaminated soil with microemulsions". HKBU Institutional Repository, 2011. http://repository.hkbu.edu.hk/etd_ra/1245.
Texto completoNonaka, Gen. "Behavior and Utilization of Sodium Dioleyl Phosphate Microemulsions". Kyoto University, 1999. http://hdl.handle.net/2433/181683.
Texto completoO'Donnell, Jennifer M. "Reversible addition-fragmentation chain transfer in microemulsion polymerizations". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 218 p, 2007. http://proquest.umi.com/pqdweb?did=1354135141&sid=45&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texto completoCarlile, Katherine. "Lipase-catalysed reactions in W/O microemulsion systems". Thesis, University of East Anglia, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267466.
Texto completoPrice, Ann Louise. "Characterisation of Ni(AOT)â†2 microemulsion systems". Thesis, University of East Anglia, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389224.
Texto completoKatsikides, Andrew. "Phase behaviour structure and dynamics of microemulsion systems". Thesis, University of Kent, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329298.
Texto completoKhan-Lodi, A. N. "Microparticle synthesis and colloidal catalysis in microemulsion media". Thesis, University of Kent, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234057.
Texto completoLee, Daniel Dongyuel. "Interfacial properties of surfactant monolayers in microemulsion systems". Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/33538.
Texto completoLopian, Tobias. "Characterization of a metal-extracting water-poor microemulsion". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT206/document.
Texto completoRecycling of rare earths from electronic waste has still not found a significant industrial realization. One reason is the lack of optimized separation procedures due to poor fundamental knowledge on these systems. Due to the chemical and physical similarities of these metals, designing an efficient, adaptive and predictive formulation is still out of scope of possibilities. The supramolecular interpretation of complex-formation in the organic phase has gained an increasing importance in the last years. It is the most promising approach allowing the explanation of diverse phenomena, such as third phase formation and strong signals in small scattering experiments and to revert to methods well known from surfactant science. Our contribution towards a more complete understanding in this matter is the analysis of the electrodynamic behaviour of such phases and the correlation of these findings with the results of self-assembly properties and mass transport in these media.For this study, we specifically designed a reference model, breaking an extraction process down to its four fundamental components: The extractant before extraction (Di-(2-ethylhexyl)phosphoric acid, HDEHP), the extractant after extraction (its sodium salt, NaDEHP), toluene as apolar diluent and water. A Gibbs phase prism has been prepared (illustrated in Figure 1), where the z-axis gives the ratio of HDEHP to NaDEHP, representing the development of an extraction. Covering the low frequency-domain, impedance spectroscopy has been the method of choice in order to determine the frequency-dependent conductivity. Using dielectric relaxation spectroscopy, we reveal fast dynamic processes at high frequencies. Combined SAXS and SANS measurements have been performed to compare the electrodynamic trends with aggregation properties and intercluster interactions.Two phenomena have been identified to be responsible for the conductivity profile in reverse micellar systems: the formation of charged aggregates through dismutation and percolation. Throughout the reference system, these two processes have been probed as function of three variables: total extractant concentration, the water-to-surfactant ratio and the Na:H-ratio. As a major result, water plays a significant role in both processes. In case of percolation, reverse aggregates are not able to merge in the absence of water. Therefore, electrical conductivity is prohibited. In dilute systems, water facilitates the dismutation–process leading to an increase in conductivity