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Dissertations / Theses on the topic 'Chitozan structure'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Bolbukh, I. M., G. S. Gunko, G. Yu Yurkov, G. P. Prokhodko, and V. A. Tertykh. "Nanocomposites Based on Chitozan and Carbon Nanotubers with Iron Oxides Formed by in situ Precipitation." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35367.

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Composites which contain iron oxide nanoparticles and unmodified or aminated silica were synthesised by in situ precipitation of ferrous salts in chitozan or glucose solution. Nanocomposites based on oxidized or aminated carbon nanotubers were obtained by immobilizing oxide nanoparticles in surface layer during salt precipitation in water dispersion. The metal-containing phase was obtained by the Elmore reaction using different ratios of ferrous ammonium sulfate hexahydrate (FeSO4∙(NH4)2SO4∙6H2O) and ferric chloride hexahydrate (FeCl3∙6H2O). The composites obtained were characterized usin

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Le, Grill Sylvain. "Composite chitosane-phosphate de calcium : synthèse par atomisation séchage et caractérisation structurale." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30023/document.

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Ce mémoire porte sur l'élaboration et la caractérisation d'un matériau composite chitosane/phosphate de calcium destiné à une utilisation dans le domaine de la substitution osseuse. Le procédé d'atomisation-séchage a été choisi pour élaborer ce composite sous forme d'une poudre susceptible d'être transformée en revêtement ou objet 3D. Une étude préliminaire a permis d'appréhender les mécanismes de synthèse du phosphate de calcium, la phase minérale, par atomisation-séchage. Une suspension de particules d'hydroxyapatite stœchiométrique ou d'apatite biomimétique dispersées dans une solution acid

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3

Wang, Wei. "Structural studies on chitosan." Thesis, Nottingham Trent University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389687.

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4

Costalat, Marie. "Structure et mécanisme d’élaboration de biomatériaux par complexation contrôlée de polysaccharides." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10265/document.

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Nos travaux ont porté sur le développement d'une méthode contrôlée de complexation de polyélectrolytes. La complexation est un processus spontané, sous contrôle cinétique et irréversible dans le cas de polysaccharides tels que le chitosane et les polysulfates, essentiellement le sulfate de dextrane ou l'héparine. Une conséquence de ce contrôle cinétique est que l'obtention d'objets de taille colloïdale requiert de travailler à fortes dilutions. De plus, les nanovecteurs obtenus ne sont pas toujours compatibles avec des conditions d'utilisation dans des milieux physiologiques. Le contrôle de l'

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Lizardi-Mendoza, Jaime. "Structured porous materials of chitin and chitosan." Thesis, Queen's University Belfast, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486244.

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Chitin is an abundant polysaccharide that is mainly found in the exoskeleton of arthropods (insect, crustaceans, etc.). It is chemically and structurally similar to cellulose but chitin has an acetamido group in the second position: Chitosan, the main derivative ofchitin, is deacetylated leaving the amide groups uncovered and liable to be protonated in acid environments. These together with other features provide chitin and chitosan with a range of distinctive functional properties that including structural qualities, adsorption capacity, reactivity, biocompatibility, bioactivity and biodegrad

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Vold, Inger Mari Nygård. "Periodate oxidised chitosans : structure and solution properties." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-897.

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<p>Chitosans are considered promising for a wide range of applications, and especially in the biomedical and pharmaceutical field numerous possible applications are being investigated. However, some of the properties of chitosans are not ideal for biomedical applications. Most high molecular weight chitosans are insoluble near and above physiological pH, limiting its uses. Moreover, the relatively high stiffness of chitosan chains restricts their electrostatic interactions with polyanions. To overcome this problem, chemical modification is an important approach.</p><p>The main objective of thi

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Dauth, Rosmarie. "Structure-property relationships in chitosan and selected film-forming derivatives." Thesis, Nottingham Trent University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393740.

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Lian, Qing. "Structural investigation of a mesogen-chitosan graft copolymer system." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/8598.

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9

Cochrane, Colette. "Composite chitosan 3D scaffold structure for tissue engineering :materials, fabrication method and characterisation." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492321.

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Current methods reporting preparation of chitosan and chitosan blend scaffolds are ambiguous, contradictory of one another and not conclusive of scaffold mechanical and chemical characteristics. One possibility is the lack of understanding of chitosan properties and the variety of chitosan grades available commercially, used to produce scaffolds. There is an evident gap in literature with regards scaffold preparation or a concise look at the methodical sequence from material selection and characterisation to the preparation and analysis of a scaffold for specific tissue engineering application

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Hsu, Hung-Liang. "The preparation and characterisation of porous degradable chitosan structures for tissue engineering." Thesis, Queen Mary, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528416.

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11

Köping-Höggård, Magnus. "Chitosan Polyplexes as Non-Viral Gene Delivery Systems : Structure-Property Relationships and In Vivo Efficiency." Doctoral thesis, Uppsala University, Department of Pharmacy, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3771.

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<p>The subject of this thesis was to develop and optimize delivery systems for plasmid DNA (pDNA) based on biocompatible polymers, in particular chitosan, suitable for non-viral gene therapy. At the onset of this thesis, studies had reported conflicting results on the efficiency of chitosan-based gene delivery systems. Therefore, structure-property relationships of chitosans as non-viral gene delivery systems <i>in vitro</i> and after lung administration <i>in vivo</i> were established for the first time.</p><p>Polymer-pDNA complexes (polyplexes) based on conventional high molecular weight chi

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Hassani, Thanina. "Formation d'une structure polymérique pour la stabilisation de la laccase et d'agrégats de laccase réticules." Mémoire, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/5514.

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L'utilisation d'enzymes dans différentes applications biotechnologiques et industrielles s'est avérée prometteuse durant les dernières décennies. La laccase est une enzyme qui suscite l'attention, notamment, grâce à sa capacité à dégrader une vaste gamme de polluants présents dans l'environnement, à son apparente stabilité, et au fait qu'elle peut d' [sic] être utilisée dans une variété d'applications comme : les cosmétiques, l'industrie du papier, ou encore le traitement des eaux et la bioremédiation de sols. Il apparaît donc pertinent d'améliorer le potentiel d'utilisation de cette enzyme en

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Jacquot, Charlotte. "Vieillissement des bio-polymères : étude structurale et fonctionnelle." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0293/document.

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Les inquiétudes concernant la gestion des déchets sont croissantes dans un contexte environnemental préoccupant. De ce fait, il est apparu urgent de trouver des substituts aux plastiques conventionnels et les biopolymères semblent être une réponse prometteuse. Leurs propriétés leur permettent des usages très divers, de l'emballage alimentaire à la bio-ingénierie tissulaire en passant par la formulation cosmétique ou la pharmaceutique. S'ils jouissent d'une image positive et de l'intérêt croissant des scientifiques comme des industriels, on ne connait encore que peu leur comportement lors du vi

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Bouaziz, Philippe. "Biomimicry & biomaterial engineering : investigation of natural templates chitosan scaffolds for cardiomyoplasty." Paris 7, 2013. http://www.theses.fr/2013PA077150.

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La cardiomyopathie représente un problème de santé publique. Malgré les progrès accomplis dans son traitement, le pronostic demeure sévère, justifiant la recherche permanente d'options thérapeutiques nouvelles. La thérapie cellulaire vise en premier lieu la régénération de zones myocardiques nécrosées. En effet, de nombreuses études effectuées sur des modèles animaux ont démontré qufune greffe cardiaque de cellules souches adultes peut améliorer la fonction ventriculaire mais malheureusement ne permet pas de générer de nouveaux éléments contractiles capables de se connecter au réseau de cellul

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Karaki, Nadine. "Impact de la fonctionnalisation enzymatique de la pectine par des composés phénoliques sur la structure et les propriétés physicochimiques du polymère." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0205/document.

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Cette thèse porte sur la fonctionnalisation de la pectine de citron par des composés phénoliques. Une première stratégie a consisté à greffer les produits issus de l’oxydation de l’acide férulique (AF), en milieu aqueux (pH 7,5, 30 ° C), en présence de la laccase de Myceliophthora thermophila (obtention de pectine F). L’enjeu était de démontrer le greffage covalent de composés phénoliques exogènes sur le polysaccharide, de recueillir des informations sur la structure et les propriétés du polymère fonctionnalisé et de les comparer aux caractéristiques du polymère natif. Une deuxième stratégie d

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Colenci, Ana Vivian Parrelli. "Efeito de uma formulação contendo o biopolímero quitosana sobre a fibra capilar caucasiana." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/82/82131/tde-14022008-090538/.

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Há um número crescente de indústrias no ramo de cosméticos atualmente, devido ao fato das pessoas se preocuparem mais com suas aparências e ansiarem por produtos de qualidade. Em decorrência desse fato as indústrias vêem investindo cada vez mais nas áreas de pesquisas e desenvolvendo tecnologia neste segmento. Este trabalho visa o estudo das fibras capilares e a interação das mesmas com uma formulação comercial contendo como ativo principal o biopolímero quitosana. Utilizou-se para tanto técnicas como microscopia eletrônica de varredura, microscopia ótica, microscopia de força atômica, análise

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Kuznetsov, V. N., A. S. Stanislavov, S. N. Danilchenko, et al. "Structural Properties of the Nanocrystallized Magnetite of Different Syntheses." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35450.

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Transmission electron microscopy (TEM) with electronic diffraction and X-ray diffraction (XRD) was used to study structural features of nanosized magnetite Fe3O4, which was synthesized using polymeric matrices (polysaccharide chitosan, at alias). From the received data it was revealed that growth inhibition and size stabilization of Fe3O4 nanoparticles were strongly affected by polysaccharide matrix. It was also observed that directional size decrease of Fe3O4 nanoparticles was accompanied by the increasing defectiveness of crystal lattice and decreasing unit cell size. The effectiveness

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Wang, Wei-Wei. "Préparation, structure et stabilité des nanocomposites biodégradables à base de polyactide." Nantes, 2013. https://archive.bu.univ-nantes.fr/pollux/show/show?id=8918e7f6-f797-41b5-aa3c-9bae554f5462.

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Payet, Linda. "Viscoélasticité et structure de gels à base de chitosane - Relations avec les propriétés diffusionnelles de macromolécules dans ces biogels." Phd thesis, Université Paris-Diderot - Paris VII, 2005. http://tel.archives-ouvertes.fr/tel-00011265.

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Dans ce travail, nous présentons une étude de biogels à base de chaînes de chitosane (polyélectrolyte naturel de la famille des polysaccharides) réticulées chimiquement en solution aqueuse. Notre objectif est double : caractériser la structure de ces gels et comprendre comment s'y déroule la diffusion de masse. À partir de mesures de spectroscopie mécanique, nous avons montré que l'on pouvait moduler la cinétique de formation et la structure de ces hydrogels en fonction de la masse molaire et la concentration de chitosane, du pH et de la teneur en POE (polyoxyéthylène). Ces résultats ont été c

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Kurek, Mia. "Comprehensive study of the effects of formulation and processing parameters on structural and functional properties of active bio-based packaging films." Thesis, Dijon, 2012. http://www.theses.fr/2012DIJOS095/document.

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Cette étude porte sur l’analyse du mécanisme de transfert du carvacrol (molécule antimicrobienne volatile) au travers de films à base de chitosan. La composition, la structure, les paramètres de procédés et de séchage de la couche de chitosan ont été corrélés aux propriétés physico-chimiques et fonctionnelles des films. La compréhension de ces facteurs et de leurs influences est cruciale à l’optimisation de la production de films actifs à base de polyéthylène enduits de chitosan. En effet, composition, microstructure et condition environnementale (température, humidité) conditionnent la rétent

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Brodel, Bruno. "Étude de la chitinase d'une nouvelle espèce de Thermoactinomyces : application à l'obtention de polymères de chitosane de structure et de masse moléculaire contrôlée." Compiègne, 1992. http://www.theses.fr/1992COMPD518.

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Le chitosane, obtenu par N-désacétylation chimique de la chitine, constitue le seul polysaccharide cationique naturel et peut être utilisé dans divers domaines d'application tels que les secteurs cosmétique, pharmaceutique ou médical. L'hydrolyse enzymatique du chitosane peut être réalisée grâce aux chitinases (EC 3. 2. 1. 14) ou aux chitosanases (EC 3. 2. 1. 132) mais les productivités en enzymes des souches de la littérature étaient trop faibles pour envisager une dépolymérisation enzymatique du chitosane à l'échelle industrielle. Nous avons isolé une nouvelle espèce bactérienne thermophile,

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Tea, Lingsam. "Stabilisation et caractérisation des émulsions eau dans eau stabilisées par des polysaccharides linéaires." Thesis, Le Mans, 2020. http://www.theses.fr/2020LEMA1018.

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Une émulsion est un mélange de deux liquides non miscibles. Les émulsions les plus connues sont les émulsions eau dans huile (mayonnaise, vinaigrette) ou huile dans eau (crème cosmétique), mais il est aussi possible de réaliser des émulsions eau dans eau ou encore huile dans huile. Lorsque deux solutions aqueuses de polymères hydrosolubles incompatibles sont mélangées, on forme une émulsion eau dans eau. Comme toute émulsion, les émulsions eau dans eau sont thermodynamiquement instables et tendent vers une séparation de phase. Il faut donc stabiliser ces émulsions. Contrairement aux émulsions

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Zhuk, Mikalai. "Nanostructured granules for controlled delivery of dexamethasone." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14181.

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Mestrado em Ciência e Engenharia de Materiais<br>A Drug Delivery System (DDS) may provide the precise transportation of the medical drug inside the patient’s body, directly to the pathological area or alternatively it may be also locally administrated. Once at the site of interest, the ideal DDS is expected to release the drug in a sustained manner according to the specific needs of the patient. As compared to other routes of drug administration, an appropriately designed DDS which active components are conveniently targeted should also ensure the desired in situ treatment without harmful effe

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BRUGNEROTTO, JOEL. "Contribution a l'etude des chitines et des chitosanes." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10134.

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Le chitosane est obtenu par desacetylation de la chitine, qui est le deuxieme polysaccharide naturel le plus abondant sur terre apres la cellulose. Tout d'abord, nous avons determine le degre d'acetylation (da) de nombreux echantillons de chitines et chitosanes par rmn 1h, rmn 1 3c et 1 5n cp-mas, et spectroscopie infrarouge (ir) dans toute la gamme de da. Nous avons propose une correlation entre les resultats obtenus par ir a partir du rapport d'absorbance a1320cm 1/a1420cm 1 et les da obtenus par rmn. Une premiere etude de la repartition des differentes unites constitutives le long de la cha

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DANTAS, Maria Jucélia Lima. "Estruturas tridimensionais fabricadas a partir de esferas quitosana/hidroxiapatita para regeneração óssea." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1002.

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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-06-15T19:48:16Z No. of bitstreams: 1 MARIA JUCÉLIA LIMA DANTAS – DISSERTAÇÃO (PPG-CEMat) 2016.pdf: 3511044 bytes, checksum: c308b22312ce9f189d694fc843ba74af (MD5)<br>Made available in DSpace on 2018-06-15T19:48:16Z (GMT). No. of bitstreams: 1 MARIA JUCÉLIA LIMA DANTAS – DISSERTAÇÃO (PPG-CEMat) 2016.pdf: 3511044 bytes, checksum: c308b22312ce9f189d694fc843ba74af (MD5) Previous issue date: 2016-02-29<br>Capes<br>Estruturas tridimensionais são ferramentas bastante atrativas para a engenharia de tecidos, mimetizado

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Lima, Maria de Morais. "Avaliação de filmes à base de quitosana combinado com goma xantana e hidrolisado proteico de corvina (Micropogonias furnieri)." Universidade Federal de Pelotas, 2017. http://repositorio.ufpel.edu.br:8080/handle/prefix/3365.

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Submitted by Gabriela Lopes (gmachadolopesufpel@gmail.com) on 2017-05-03T13:41:09Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) MARIA_25_04.pdf: 2995946 bytes, checksum: d7b7fa4d4fc79b39b52b4ecc6ca1f975 (MD5)<br>Approved for entry into archive by Aline Batista (alinehb.ufpel@gmail.com) on 2017-05-04T11:35:48Z (GMT) No. of bitstreams: 2 MARIA_25_04.pdf: 2995946 bytes, checksum: d7b7fa4d4fc79b39b52b4ecc6ca1f975 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Made available in DSpace on 2017-05-04T11:35:49Z (GMT). No.

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Lundin, Maria. "Adsorption of biopolymers and their layer-by-layer assemblies on hydrophilic surfaces." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11058.

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It is widely known that surfaces play an important role in numerous biological processes and technological applications. Thus, being able to modify surface properties provides an opportunity to control many phenomena occurring at interfaces. One way of controlling surface properties is to adsorb a polymer film onto the surface, for example through layer-by-layer (LbL) deposition of polyelectrolytes. This simple but versatile technique enables various polymers, proteins, colloidal particles etc. to be incorporated into the film, resulting in a multifunctional coating. Due to recent legislations

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Rando, Daniela Gonçales. "Quimioterápicos potencialmente ativos em endemias tropicais e tuberculose: estudos de QSAR na série de 5-nitroderivados benzidrazídicos e o planejamento de pró-fármacos de ação prolongada." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/9/9138/tde-31082017-152110/.

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Malária, doença de Chagas e leishmaniose, consideradas doenças negligenciadas, e tuberculose, infecção bacteriana reemergente, que grassa em diversas regiões do mundo, constituem-se grandes desafios médico-sociais para os países acometidos. Nitroderivados são substâncias utilizadas na terapêutica como antimicrobianos de amplo espectro. O mecanismo de ação proposto para estes compostos engloba a redução do grupo nitro por nitrorredutases inespecíficas, levando à produção de radicais livres. Estes, altamente reativos, reagiriam, por sua vez, com macromoléculas, organelas, membranas e mesmo ácido

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Frost, Samuel J. "Chitosan-based nano-structured biomaterials for sutureless tissue repair." Thesis, 2018. http://hdl.handle.net/1959.7/uws:51722.

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Sutures and staples have long been considered the gold standard for tissue wound repair and re-constructive surgeries. Their usage can often result in foreign-body inflammation, infection, excessive scarring, as well as air and fluid leakage in procedures involving the lungs, blood vessels, dura mater, and urethra. With the advent of bioadhesives, there are now several alternative techniques available that limit these adverse effects. Although the majority of these techniques are minimally invasive and provide sufficient wound closure, they can lack flexibility, and present a risk of cytotoxic

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Shiah, Wei-Min, and 夏偉珉. "Study of chitosan-based nanofiber structure for cell attachment and proliferation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/48425696575844979578.

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碩士<br>中原大學<br>化學工程研究所<br>97<br>In this study, the effect of spinning solution compositions and spinning parameters on the morphology of electrospun chitosan(CS) nanofiber and the application for compatibility of cell attachment and proliferation were investigated. In this article, the effects of the degree of deacetylation(D.D.) of chitosan, molecular weight of PEO, concentration of spinning solution, degradation time, feed flow rate, operating voltage and working distance on the fiber morphology and diameter were studied. From viscosity measurement, viscosity of spinning solution between 500

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Huang, Chun-Chien, and 黃俊傑. "Application on Pervaporation of Network Structure based on Chitosan/Poly(vinyl alcohol)." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29037463565396851590.

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碩士<br>國立雲林科技大學<br>工業化學與災害防治研究所<br>92<br>In this study, we use the network structure membrane to separation ethanol and water mixture. The network structure membrane were synthetic by polyblends composed of chitosan and poly vinyl alcohol (PVA) with various ratios than reacted with glutaraldehyde form net structure to improve chitosan/PVA membrane’s swelling in water and increase chitosan membrane’s free volume. We hope the prepared crosslinking membranes can increase permeation rate when it was used to separate the alcohol and water mixtures. The crosslinking reaction were confirmed by FT-IR.

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Wu, Pei-Yi, and 吳珮宜. "A study on structure and properties of in-situ polymerization of Chitosan-MDI." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/w73qc2.

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碩士<br>國立臺灣科技大學<br>高分子系<br>94<br>Chitosan is a biological polymer. It has good biological compatibility, avirulence, degradable and antibiotic. Besides, the storage on the earth is after cellulose. The advantage is that it can be obtained from the waste shell of shrimp and crab. Therefore, it is widely used on medical material. MDI is one of the most important material for PU. The characteristics involve that the machinery is excellent, reaction is fast and processing is easy. It is mainly used to produce PU elastomer, artificial leather,synthesized skin, fabric coating dress down agent and hum

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Yu, Hsing-ning, and 余興寧. "Electrospinning of Chitosan/Alginate Composite Nanofibrous Structures for Cell Adhesion and Proliferation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/39069674935200172157.

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碩士<br>國立中央大學<br>化學工程與材料工程研究所<br>100<br>To custom-tailor biomaterial surfaces for tissue engineering application, we developed chitosan/alginate composite surfaces using electrospinning technique. Firstly, chitosan and alginte were solely electrospun, respectively. Poly (ethylene oxide) (PEO) was added to both chitosan and alginte solutions, and the effect of polymer composition on fibrous morphology was studied through scanning electrical microscopy (SEM). In addition, viscosities of polymer solution were also analyzed, demonstrating that higher concentrations of polyme

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Shrestha, Annie. "Photodynamically Activated Multifunctional Chitosan Nanoparticles to Disinfect and Improve Structural Stability of Dentin." Thesis, 2013. http://hdl.handle.net/1807/43726.

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Bacteria have been confirmed as the main etiological factor for root canal infection as well as for root canal treatment failure. Thus the success of endodontic treatment depends on the complete elimination of bacteria and prevention of bacterial recolonization in the root canal system. The major challenge for conventional root canal disinfection strategies is the ability of bacteria to persist as biofilms within the anatomical complexities of the root canal system. In addition, the alterations in the ultrastructure of dentin tissue results in compromised structural integrity of root dentin le

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Albuquerque, Tomé Mendes. "Computational Structural Simulation of Chitosan Tubes Used for the Regenerating Peripheral Nerve Tissues." Master's thesis, 2019. https://hdl.handle.net/10216/122372.

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Yeh, Shao-Yu, and 葉紹宇. "Effect of Foam Structure and Performance on Composition of Water Soluble Chitosan/P-MDI through in-situ Polymerization." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/47556469258532735451.

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碩士<br>國立臺灣科技大學<br>高分子系<br>96<br>Chitosan is a versatile biological polymer. As chitosan polymer blends easily with others, in this present study, we use this characteristic and mix chitosan with isocyanate to develop a similar structure of the porous PU foam materials. This paper is to explore different solid contents of the water-soluble chitosan and P-MDI to conduct in-situ polymerization. As water-soluble chitosan has the chemical structure –OH functional groups that can carry out in-situ polymerization reaction with P-MDI of -NCO structure. And the foaming can be an agent with water to acq

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Kuo, Ting-Yu, and 郭亭佑. "A New Type of Gadodiamide-Conjugated Chitosan Amphiphiles For MR Imaging: Synthesis, Structural Evolution, and Cytocompatibility." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/81174781409871675990.

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Cheng, Wei-Da, and 鄭暐達. "LSPR Nanosensor with Bared AuNR-Amphiphilic Chitosan Core-Shell Structure : pH Induced Selectivity, Sensitivity enhancement, Adorption Kinetics Analysis of Protein." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/55199950958225443177.

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碩士<br>國立交通大學<br>材料科學與工程學系奈米科技碩博士班<br>102<br>Early detection for various diseases is upmost important strategy for medical treatment. The specific DNA or proteins that come from diseased cells can be the marker to be detected for identifying the occurrence of specific diseases. In this study, we develop a collodial-type sensor utilized gold nanorods (AuNRs) for protein detection due to its unique localized surface plasmon resonance (LSPR) property. AuNRs were synthesized by the seed-mediate method with high yield. A novel core-shell nanoprobe sensor AuNR-CHC was synthesized by the self-assemble

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Batuca, Ana Raquel dos Reis. "Development of 3D porous structures for buccal drug delivery." Master's thesis, 2016. http://hdl.handle.net/10362/63364.

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Advances in polymer science and engineering has led to the development of new poly-meric systems for controlled drug delivery in the oral cavity. In this work, pH responsive scaf-folds were prepared by two distinct methods: freeze-drying and gelation process followed by scCO2-assisted drying. The objective was to obtain two distinct porous structures, a gum and a candy to treat oral diseases. The scaffolds of chitosan (CHT), xanthan gum (XG) and polymer m (PM) were prepared with and without crosslinkers (N,N’-methylene-bis-acrylamide (MBA), tet-ramethylenediamine (TEMED) and ammonium persulfat

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Ko, Yi-Ping, and 戈一平. "A New Type of Gadodiamide-Conjugated Chitosan Amphiphiles For MR Imaging: Molecular Structural Analysis and Animal Imaging." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/wd35vb.

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碩士<br>國立交通大學<br>材料科學與工程學系所<br>105<br>Cancer has been the leading cause of death over decades worldwide, one of the main reasons is its difficulty of tumor detection in early stage, and has long been a prime research objective in the field from materials science to nanomedicine. In clinical practices, magnetic resonance imaging (MRI), which uses non-ionizing radiation, is a non-invasive and powerful diagnostic tool for cancer detection. MRI often uses contrast agent to make the images of human body clear. The current commonly used contrast agent is gadolinium(64Gd)-based contrast agent (GBCA),

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Chen, Sheng-Han, and 陳聖翰. "Study on the structure of electrospun chitosan/ poly(DL-lactide) composite fibrous scaffold for human fibrosarcoma cells (HT1080) attachment and proliferation." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/29700187425549394987.

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碩士<br>中原大學<br>化學工程研究所<br>98<br>In this study, the effect of morphology design of chitosan/ poly(DL-lactide) electrospun composite fibrous scaffold on the attachment and proliferation of human fibrosarcoma cells (HT1080)were investigated. The bead-free and the most uniformity of PDLLA fibers could be fabricate through adjusting spinning parameters, e.g. under the condition of polymer concentration: 15wt%, working distance: 30 cm and needle diameter: 0.16 mm. Otherwise, the degradation test of chitosan spunning solution were also investigated. The result showed that the viscosity of chitosan sol

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Hsu, Shun-Chieh, and 許舜傑. "Effect of pH and degree of deacetylation on molecular structures and properties of glycol chitosan hydrogel: a molecular dynamics study." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/4at9vv.

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碩士<br>國立臺灣大學<br>高分子科學與工程學研究所<br>107<br>Chitosan is a natural polycationic linear polysaccharide deacetylated from chitin. Glycol chitosan is a derivative of chitosan and has been extensively investigated in the biocompatibility and hydrogel field for many bioengineering applications because of their unique material and biological properties. Smart hydrogels are a promising biomaterial for wound healing and tissue regeneration among them. However, the molecular structure and network of glycol chitosan hydrogels remain unclear. Here, glycol chitosan hydrogel models at different protonation perce

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Hsieh, Te-Hsien, and 謝得賢. "Preparation of Enviromentally Sensitive Poly(N- isopropylacrylamide)/Chitosan Fibers via Electrospinning with Core-Sheath Structure and Their Applications on Metal Ion Adsorption." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/28665843159834207355.

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碩士<br>國立臺灣大學<br>化學工程學研究所<br>103<br>In this research, thermo-responsive and pH-responsive fibers with Core-Sheath structure were fabricated by co-axial electrospinning. The thermo-responsive and thermo-crosslinkable copolymer poly(NIPAAm-co-NMA) (PNN) was fabricated as the core material. Chitosan and PNN/Chitosan blend were chosen as sheath material. We used trifluoroacetic acid (TFA) / dichloromethane (DCM) = 0.73/0.27 (w/w) as solvent for core and sheath. After fabricating core-sheath fibers, we used scanning electron microscope (SEM) and transmitting electron microscope (TEM

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Rodrigues, Catarina de Oliveira. "Optimization of 3D porous structures for controlled drug delivery using quality by design method." Master's thesis, 2017. http://hdl.handle.net/10362/25106.

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The objective of this work was to apply Quality by Design approach to obtain the best conditions to produce 3D polymeric structures for two distinct applications: oral and vaginal route of administration. The first should release 50 mg drug/g scaffold, in 5 hours and the second one 800 mg drug/g scaffold, during 8 h. Initially, the data from previous studies was collected and inserted in MODDE software, and then the Design Space was built and according to those plots, the conditions to start the experimental validation were chosen. The model chosen to perform these studies was Partial Least S

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Huang, Shu-Ling, and 黃淑玲. "Structural characteristics and properties of transparent or bioactive silica/poly(2-hydroxyethyl methacrylate) hybrid materials and pH-sensitive silica/chitosan hybrid." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/45605106001202903810.

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博士<br>國立清華大學<br>化學工程學系<br>93<br>The merits to hybridize the inorganic material with the organic polymer including to reduce the brittleness of inorganic material, to enhance the rigidity and thermal resistance of organic material and to provide unique properties such as in optical, in electronic, in magnetic or others by the proper design and selection of organic and inorganic precursors to hybridize, hence, was the intention to study in this thesis. Three types of silica/polymers hybrid materials, silica/poly(2-hydroxyethyl methacrylate (PHEMA) hybrids, bioactive (3-trimethoxysilyl)propyl me

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Beil, Stephan. "Beiträge zum molekularen Verständnis der Aggregation und der Komplexierung von GnRH-Antagonisten und GHRH-Analoga." Doctoral thesis, 2018. https://tud.qucosa.de/id/qucosa%3A32469.

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Die vorliegende Arbeit beschäftigt sich mit der molekularen Struktur der amyloiden Aggregate von Antagonisten des Gonadotropin-Releasing Hormones (GnRH) und Analoga des Growth Hormone-Releasing Hormones (GHRH) sowie deren schrittweiser Bildung und der Inhibierung dieses Prozesses durch verschiedene Polyphenole. Die dabei erhaltenen Erkenntnisse werden genutzt, um pharmazeutisch relevante Depotformulierungen der genannten Peptide zu generieren und deren Freisetzungsverhalten zu untersuchen. Die 3D Strukturen der Peptidmonomere werden basierend auf zweidimensionalen NMR-Experimenten aufgeklärt.

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Manna, Uttam. "Stimuli Responsive Multilayer Thin Films And Microcapsules Of Polymers Via Layer-By-Layer Self-Assembly." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2020.

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The present thesis focuses on the selection of polymers and methods to fabricate stable and stimuli responsive multilayer self-assembly via layer-by-layer (LbL) approach. The polymers utilized in this study are biodegradable and biocompatible such as hyaluronic acid, chitosan and poly(vinyl alcohol) (PVA). The thesis is comprised of six chapters and a brief discussion on the contents of the individual chapters is given below. Chapter I reviews the LbL self-assembly approach in the context of drug delivery. The various interactions such as electrostatic, hydrogen bonding and covalent bondin

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Manna, Uttam. "Stimuli Responsive Multilayer Thin Films And Microcapsules Of Polymers Via Layer-By-Layer Self-Assembly." Thesis, 2011. http://hdl.handle.net/2005/2020.

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The present thesis focuses on the selection of polymers and methods to fabricate stable and stimuli responsive multilayer self-assembly via layer-by-layer (LbL) approach. The polymers utilized in this study are biodegradable and biocompatible such as hyaluronic acid, chitosan and poly(vinyl alcohol) (PVA). The thesis is comprised of six chapters and a brief discussion on the contents of the individual chapters is given below. Chapter I reviews the LbL self-assembly approach in the context of drug delivery. The various interactions such as electrostatic, hydrogen bonding and covalent bonding i

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ESQUENET, Catherine. "Propriétés structurales et dynamiques des solutions de polyélectrolytes rigides et semi-rigides et de polysaccharides associatifs." Phd thesis, 2003. http://tel.archives-ouvertes.fr/tel-00005468.

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Des expériences de diffusion de la lumière et des neutrons réalisées sur des solutions de polyélectrolytes semi-rigides et rigides modèles en présence d'un excès de sel ont montré qu'en régime dilué ces solutions ont le comportement typique de bon solvant. En régime semi-dilué, la fonction d'autocorrélation est bimodale. Le mode rapide est relié à la longueur de corrélation du réseau et le mode lent est lié à la présence d'associations (phénomène unique des polysaccharides). L'étude de solutions de chitosane alkylé réalisée à partir d'expériences de diffusion du rayonnement et de rhéologie a p

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