New Types of Functional Nanocarriers by Nano Precipitation PDF Download

Author: Ricardo Almeida Neves Sampayo Ramos
Publisher:
ISBN:
Category :
Languages : en
Pages : 198

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Book Description
La technique de nanoprécipitation est une méthode simple et reproductible pour la synthèse de nanocapsules à coeur huileux recouvertes d'une enveloppe de polymères hydrophiles réticulés (polysaccharides, glycopolymères vinyliques...) en une seule étape. Grâce à leur biocompatibilité, leur biodégradabilité et leur activité biologique adaptables, les protéines constituent une autre grande famille de biopolymères d'intérêt pour des applications dans le domaine de l'encapsulation. Cependant, la production de nanocapsules protéiques par nanoprécipitation n'a jamais été décrite. Dans ce contexte, l'objectif principal de ce travail de thèse a été l'évaluation du potentiel d'une famille de protéines, les Suckerines, pour le procédé de nanoprécipitation. Les Suckerines sont une famille de protéines issues des dents décorant les ventouses du calamar géant Humboldt avec de prometteuses applications dans le domaine biomédical. Ces protéines possèdent une structure modulaire de type copolymère à bloc capable de former des feuillets bêta conférant de bonnes propriétés mécaniques. Les suckerines étant solubles dans une solution tampon composée d'acide acétique (pH 3) mais fortement agrégées dans les conditions de pH (valeurs comprises entre 5 et 10) classiquement utilisées pour la préparation de nanocapsules à coeur huileux par basculement de solvant, nous avons finalement choisi d'explorer la nanoprécipitation des protéines par salt shifting et donc la préparation de nanoparticules protéiques. L'utilisation du persulfate d'ammonium comme agent de coacervation et précurseur de radicaux et du tris(2,2′ bipyridyl)dichlororuthenium(II) hexahydrate a permis de produire des nanoparticules de suckerine de tailles modulables (100-185 nm de diamètre). Ces nanoparticules présentent des structures secondaires type feuillets bêta qui sont à l'origine du module de Young très élevé observé pour ces nano-objets (de l'ordre de grandeur du GPa). Une protéine de fusion, soluble en milieu aqueux à pH 7 a spécialement été conçue par voie de recombinaison dans le but de générer des nanocapsules protéiques par nanoprécipitation. Cette protéine (suckerine-soie) est formée d'un bloc central de peptide dérivé de suckerine de calamar promouvant une stabilité structurelle et deux blocs terminaux issus de fibroïnes de soie qui permettent à la protéine de fusion d'être soluble à un pH physiologique. Ce design moléculaire a permis la fabrication de nanocapsules remplies respectivement de hexadécane ou de miglyol avec une enveloppe de suckerine-soie et de tailles de l'ordre de grandeur de 190 à 250 nm. Finalement, aspirant à encapsuler un principe actif anti-cancéreux dans les nanocapsules à base de glycogène, nous avons développé un protocole où la méthode de nanoprécipitation est utilisée pour produire des nanoparticules de prodrogue entourés de glycogène.

Author: Ye Liu
Publisher: CRC Press
ISBN: 0429767870
Category : Science
Languages : en
Pages : 359

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Book Description
Polymers are one of the most versatile and important materials used for capsule preparation despite various others available. Suitably formulated capsules can securely protect ingredients, deliver them to targeted sites, and release them expeditiously, improving functions and minimizing adverse effects. New polymers are constantly being explored to develop more efficient capsules as they are routinely used in pharmaceuticals, consumer healthcare products, nutrients, and food. This book focuses on the current state of the art of polymer-based capsules and delivery systems. It describes the formulation processes of capsules developed from redox-responsive polymers and polymer-functionalized carbon nanotubes, in addition to shedding light on coacervation of polymers for encapsulation. It reviews different active ingredients that can be used with polymer capsules in various products, encapsulation of essential oils using such capsules, and development of polymer capsules of cells and bacteriophages.

Author: Neelesh Kumar Mehra
Publisher: Elsevier
ISBN: 0323852947
Category : Technology & Engineering
Languages : en
Pages : 604

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Book Description
Multifunctional Nanocarriers provides information on the concept, theory and application of multifunctional nanocarriers. The book covers current research, beginning with product strategy, targeted drug delivery, and advanced drug delivery approaches, along with numerous multifunctional nanocarriers and their regulatory considerations for product development. The book covers targeting, receptor mediated targeting, and recent advancements using multifunctional nanocarriers and their regulatory aspects. This is an important reference source for materials scientists and engineers who want to learn more about how multifunctional nanocarriers are applied in a range of biomedical applications. - Explains the fundamentals, concepts, theory and application of multifunctional nanocarriers, with advanced content and applications for a range of biomedical applications - Covers production and manufacturing processes for multifunctional nanocarriers for biomedical applications - Assesses major challenges in applying multifunctional nanocarriers on an industrial scale

Author: Alexandru Mihai Grumezescu
Publisher: William Andrew
ISBN: 0128136286
Category : Science
Languages : en
Pages : 769

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Book Description
Design and Development of New Nanocarriers focuses on the design and development of new nanocarriers used in pharmaceutical applications that have emerged in recent years. In particular, the pharmaceutical uses of microfluidic techniques, supramolecular design of nanocapsules, smart hydrogels, polymeric micelles, exosomes and metal nanoparticles are discussed in detail. Written by a diverse group of international researchers, this book is a valuable reference resource for those working in both biomaterials science and the pharmaceutical industry. - Shows how nanomanufacturing techniques can help to create more effective, cheaper pharmaceutical products - Explores how nanofabrication techniques developed in the lab have been translated to commercial applications in recent years - Explains safety and regulatory aspects of the use of nanomanufacturing processes in the pharmaceutical industry

Author: Chintal Desai
Publisher:
ISBN:
Category :
Languages : en
Pages : 82

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Book Description
Nanotechnology is a rapidly growing industry that is exploiting the novel characteristics of materials manufactured at the nanoscale. Carbon based nanomaterials such as Carbon Nanotubes (CNTs) and Detonation Nanodiamond (DND) possess unique properties and find a wide range of industrial applications. With the advent of mass production of such materials, there is a possibility of contamination of water resources. Depending on the surface properties and structures, they might aggregate and settle down, or be dispersed and transported by the water. Therefore, there is a need to develop an understanding of the fate of such materials in aqueous media. The understanding and effect of solution chemistry is a key to predicting their deposition, transport, reactivity, and bioavailability in aquatic environments. The colloidal behavior of organic dispersed CNTs and water dispersed DNDs is investigated. The aggregation behavior of these two colloidal systems is quite different from that of hydrophilic, water soluble functional ized CNTs (F-CNTs). The values of the Fuchs stability ratio or the critical coagulant concentration are determined experimentally using time-resolved dynamic light scattering and are used to predict the stability of such systems. It is found that the aggregation behavior of the organic dispersed, antisolvent precipitated system does not follow the conventional Derjaguin--Landau--Verwey--Overbeek (D LVO) theory. But they stabilize in the long term, which is attributed to the supersaturation generated by different solubility of a solute in the solvent/antisolvent. Based on particle size distribution, zeta potential as well as the aggregation kinetics, the water dispersed DNDs are found to be relatively stable in aqueous solutions, but aggregate rapidly in presence of mono and divalent salts. Also, the formation of carboxylic groups on the DND surface does not alter colloidal behavior as dramatically as it does for other nanocarbons especially carbon nanotubes. Formation of colloidal dispersions via precipitation processes has been widely used in the chemical and pharmaceutical industries. The synthesis of micro- particles for hydrophobic drugs is effectively carried out via anti-solvent precipitation method. The formation of small particles in the precipitation method is strongly influenced by colloidal interactions, and therefore, dependent on the properties of the particles and the liquid. The effect of solvent on the colloidal stability of the micro-drug particles is studied in detail. It is found that the organic solvent plays an important role on particle formation, polymorphism and stability of micron scale drug particles in aqueous media. Also, the supersaturation can be varied by using different solvents and the physicochemical characteristics of the suspension can be altered, which affects stability. Understanding of the colloidal stability and the aggregation kinetics has great importance not only for fundamental researches, but also for their applications.

Author: Alexandru Mihai Grumezescu
Publisher: William Andrew
ISBN: 0128166290
Category : Science
Languages : en
Pages : 581

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Book Description
Nanomaterials for Drug Delivery and Therapy presents recent advances in the field of nanobiomaterials and their important applications in drug delivery, therapy and engineering. The book offers pharmaceutical perspectives, exploring the development of nanobiomaterials and their interaction with the human body. Chapters show how nanomaterials are used in treatments, including neurology, dentistry and cancer therapy. Authored by a range of contributors from global institutions, this book offers a broad, international perspective on how nanotechnology-based advances are leading to novel drug delivery and treatment solutions. It is a valuable research resource that will help both practicing medics and researchers in pharmaceutical science and nanomedicine learn more on how nanotechnology is improving treatments. - Assesses the opportunities and challenges of nanotechnology-based drug delivery systems - Explores how nanotechnology is being used to create more efficient drug delivery systems - Discusses which nanomaterials make the best drug carriers

Author: Cristina Sabliov
Publisher: John Wiley & Sons
ISBN: 1118462173
Category : Technology & Engineering
Languages : en
Pages : 402

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Book Description
The continued advancement in the sciences of functional foods and nutraceuticals has clearly established a strong correlation between consumption of bioactives and improved human health and performance. However, the efficacy and bioavailability of these bioactive ingredients (e.g., omega-3 oils, carotenoid antioxidants, vitamins, and probiotic bacteria) in foods often remains a challenge, due to their instability in food products and gastrointestinal tract, as well as their limited bioavailability. In some cases, these bioactive ingredients may impart an undesirable organoleptic characteristic to the final product, which hinders acceptance by consumers. In addressing these challenges, development of effective delivery systems is critical to meet the consumer needs for effective bioactives. The scientific knowledge behind developing effective delivery of bioactive components into modern and wide-ranging food products will be essential to reap their health-promoting benefits and to support the sustained growth of the functional foods market. Nanotechnology and Functional Foods: Effective Delivery of Bioactive Ingredients explores the current data on all aspects of nanoscale packing, carrying and delivery mechanisms of bioactives ingredients to functional foods. The book presents various delivery systems (including nano-emulsions, solid lipid nanoparticles, and polymeric nano-particles), their properties and interactions with other food components, and fate in the human body. Later chapters emphasize the importance of consumers attitude towards nano-delivery for the success of the technology and investigate the challenges faced by regulatory agencies to control risks and harmonize approaches worldwide. The wide applicability of bioactive delivery systems with the purpose of improving food quality, food safety and human health will make this book a worthy reference for a diverse range of readers in industry, research and academia.

Author: David Julian McClements
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110788454
Category : Technology & Engineering
Languages : en
Pages : 194

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Book Description
Nanotechnology is increasingly being utilized within the food industry to create innovative products with new or improved properties. This book introduces the history of nanotechnology applications in the food industry. It then discusses the key physicochemical and structural characteristics of the different kinds of nanoparticles found in foods, as well as showing how these characteristics lead to their unique functional attributes. Applications of nanotechnology in the food and agricultural industries are then covered, including the creation of nanopesticides, nanofertilizers, nutrient delivery systems, functional ingredients, smart packaging materials, nanofilters, and sensors, as well as for the conversion of waste materials into value-added products. Finally, the potential toxicity of both organic and inorganic nanoparticles found in foods is critically assessed. The author is a Distinguished Professor of food science who uses physics, chemistry, and biology to improve the quality, safety, and healthiness of foods. He has published over 1200 scientific articles and 13 books in this area and is currently the most highly cited food scientist in the world. He has won numerous awards for his scientific achievements. The aim of this book is to provide scientists and technologists with an understanding of the basic principles of nanotechnology and how they can be used in the food and agricultural industry to improve the quality, sustainability, safety, and healthiness of our foods.

Author: Alok Dhawan
Publisher: Royal Society of Chemistry
ISBN: 1788012593
Category : Medical
Languages : en
Pages : 380

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Book Description
The rapid expansion of the nanotechnology field raises concerns, like any new technology, about the toxicity and environmental impact of nanomaterials. This book addresses the gaps relating to health and safety issues of this field and aims to bring together fragmented knowledge on nanosafety. Not only do chapters address conventional toxicity issues, but also more recent developments such as food borne nanoparticles, life cycle analysis of nanoparticles and nano ethics. In addition, the authors discuss the environmental impact of nanotechnologies as well as safety guidelines and ethical issues surrounding the use of nanoparticles. In particular this book presents a unique compilation of experimental and computational perspectives and illustrates the use of computational models as a support for experimental work. Nanotoxicology: Experimental and Computational Perspectives is aimed towards postgraduates, academics, and practicing industry professionals. This highly comprehensive review also serves as an excellent foundation for undergraduate students and researchers new to nanotechnology and nanotoxicology. It is of particular value to toxicologists working in nanotechnology, chemical risk assessment, food science, environmental, safety, chemical engineering, the biological sciences and pharmaceutical research.

Author: Daniel L. Fedlheim
Publisher: CRC Press
ISBN: 9780585404394
Category : Science
Languages : en
Pages : 348

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Book Description
A state-of-the-art reference, Metal Nanoparticles offers the latest research on the synthesis, characterization, and applications of nanoparticles. Following an introduction of structural, optical, electronic, and electrochemical properties of nanoparticles, the book elaborates on nanoclusters, hyper-Raleigh scattering, nanoarrays, and several applications including single electron devices, chemical sensors, biomolecule sensors, and DNA detection. The text emphasizes how size, shape, and surface chemistry affect particle performance throughout. Topics include synthesis and formation of nanoclusters, nanosphere lithography, modeling of nanoparticle optical properties, and biomolecule sensors.