Development of Novel Thermosensitive Polymers for Bioresponsive Drug Delivery
Development of Novel Thermosensitive Polymers for Bioresponsive Drug Delivery

Author: Vivek Kumar Garripelli

Publisher:

Published: 2012

Total Pages: 270

ISBN-13:

DOWNLOAD EBOOK

Stimuli-responsive polymers have already showed tremendous promise in controlled and self-regulated drug delivery. Successful construction of responsive polymers requires amalgamation of chemical, physical and biological principles. For careful therapy, a great deal of advantages offered by stimuli-responsive polymers is essential. A small or modest change in the environmental condition (e.g. temperature, pH, light) brings a sharp change in the properties of the responsive polymers. `Smart' drug delivery systems utilize these principles to mimic the biological response behavior to a certain extent. Synthetic polymers incorporated with stimuli-responsive behavior would be amenable to overcome some of the systemic and intracellular delivery barriers. Development in material science has led to the engineering of variety of smart polymers which respond to diverse biological stimuli. The current research illustrates the development of two dual-stimuli-responsive polymers applied for local drug delivery. The polymers form thermogels at body temperature and degrade in either acidic or matrix metalloproteinase rich environments. The polymers were synthesized from Pluronic® tri-block copolymers in two simple reaction schemes and thoroughly characterized for structures, physicochemical properties and cytotoxicity. The underlying principles involved in physicochemical behavior of polymers and polymer solutions were clearly discussed. The release characteristics of different therapeutic agents such as small molecule drugs, genes and proteins from the thermogels were investigated. Finally, to improve the release properties of small size proteins, a nanocomposite thermogel system was developed. The nanocomposite thermogel was based on a nanoclay, laponite, and pH-sensitive thermogelling polymer. Finally, the nanocomposite thermogel incorporated with laponite sustained the release properties of small proteins comparing to regular thermogels. Taken all together, the novel thermosensitive polymers and nanocomposite thermogel system have great potential for bioresponsive local drug delivery where the amount of bioactive release entirely depends on physiological needs.

Bioresponsive Polymers
Bioresponsive Polymers

Author: Deepa H. Patel

Publisher: CRC Press

Published: 2020-10-08

Total Pages: 228

ISBN-13: 1000517594

DOWNLOAD EBOOK

This volume, Bioresponsive Polymers: Design and Application in Drug Delivery, focuses on recent advancements in bioresponsive polymers and their design, characterization, and applications in varied fields, such as drug delivery and gene delivery. It looks at several carriers for drug delivery and biological molecules using different bioresponsive polymers. To address the many difficulties in existing dosage forms, this book provides information on recent developments to overcome drawbacks of conventional forms of the drug delivery. The chapters cover most areas of bioresponsive polymers, starting with a basic introduction to bioresponsive polymers, followed by chapters on design, characterization, and mechanism of bioresponsive polymers; and applications of drug and gene delivery using bioresponsive polymers via oral, topical, nasal, ocular, and parenteral methods. The book also reviews recent advancements in bioresponsive polymers and advanced applications, such as engineering particulate moieties, biomedical applications, hydrogels as emerging therapy, and electrochemical responses, bioresponsive nanoparticles, and bioresponsive hydrogels.

Development of Novel Stimuli-Responsive Drug Delivery Systems
Development of Novel Stimuli-Responsive Drug Delivery Systems

Author: Safaei Nikouei Nazila

Publisher: LAP Lambert Academic Publishing

Published: 2015-01-05

Total Pages: 192

ISBN-13: 9783659637735

DOWNLOAD EBOOK

Some copolymers exhibit an inverse sol-gel transition with spontaneous physical gelation upon heating. If the transition in water takes place below the body temperature and the chemicals are biodegradable, such gelling behaviour makes the associated physical gels injectable biomaterials with unique application in drug delivery1, such as injectable implant for sustained-release delivery of water-soluble or water insoluble drugs and proteins. In this work, novel pH and temperature responsive polymers were synthesized. The temperature and pH responsive self-assembly as well as sol-gel transition of prepared triblock copolymers was characterized by different methods. The developed novel di and tri block copolymers are versatile materials with several potential applications in drug delivery.

Applications of Polymers in Drug Delivery
Applications of Polymers in Drug Delivery

Author: Ambikanandan Misra

Publisher: Elsevier

Published: 2020-10-02

Total Pages: 594

ISBN-13: 0128226684

DOWNLOAD EBOOK

Applications of Polymers in Drug Delivery, Second Edition, provides a comprehensive resource for anyone looking to understand how polymeric materials can be applied to current, new, and emerging drug delivery applications. Polymers play a crucial role in modulating drug delivery and have been fundamental in the successful development of many novel drug delivery systems. This book describes the development of polymeric systems, ranging from conventional dosage forms to the most recent smart systems. Regulatory and intellectual property aspects as well as the clinical applicability of polymeric drug delivery systems are also discussed. The chapters are organized by specific delivery route, offering methodical and detailed coverage throughout. This second edition has been thoroughly revised to include the latest developments in the field. This is an essential book for researchers, scientists, and advanced students, in polymer science, drug delivery, pharmacology/pharmaceuticals, materials science, tissue engineering, nanomedicine, chemistry, and biology. In industry, this book supports scientists, R&D, and other professionals, working on polymers for drug delivery applications. Explains how polymers can be prepared and utilized for all major drug delivery routes Presents the latest advances, including drug targeting, polymeric micelles and polymersomes, and the delivery of biologicals and nucleic acid therapeutics Includes appendices with in-depth information on pharmaceutical properties of polymers and regulatory aspects

Bioadhesive Drug Delivery Systems
Bioadhesive Drug Delivery Systems

Author: Edith Mathiowitz

Publisher: CRC Press

Published: 1999-07-13

Total Pages: 704

ISBN-13: 9781420001341

DOWNLOAD EBOOK

This invaluable reference presents a comprehensive review of the basic methods for characterizing bioadhesive materials and improving vehicle targeting and uptake-offering possibilities for reformulating existing compounds to create new pharmaceuticals at lower development costs. Evaluates the unique carrier characteristics of bioadhesive polymers and their power to enhance localization of delivered agents, local bioavailability, and drug absorption and transport! Written by over 50 international experts and reflecting broad knowledge of both traditional bioadhesive strategies and novel clinical applications, Bioadhesive Drug Delivery Systems discusses mechanical and chemical bonding, polymer-mucus interactions, the effect of surface energy in bioadhesion, polymer hydration, and mucus rheology analyzes biochemical properties of mucus and glycoproteins, cell adhesion molecules, and cellular interaction with two- and three-dimensional surfaces covers microbalances and magnetic force transducers, atomic force microscopy, direct measurements of molecular level adhesions, and methods to measure cell-cell interactions examines bioadhesive carriers, diffusion or penetration enhancers, and lectin-targeted vehicles describes vaginal, nasal, buccal, ocular, and transdermal drug delivery reviews bioadhesive interactions with the mucosal tissues of the eye and mouth, and those in the respiratory, urinary, and gastrointestinal tracts explores issues of product development, clinical testing, and production and more! Amply referenced with over 1400 bibliographic citations, and illustrated with more than 300 drawings, photographs, tables, and display equations, Bioadhesive Drug Delivery Systems serves as a sound basis for innovation in bioadhesive systems and an excellent introduction to the subject. This unique reference is ideal for pharmaceutical scientists and technologists; chemical, polymer, and plastics engineers; biochemists; physical, surface, and colloid chemists; biologists; and upper-level undergraduate and graduate students in these disciplines.

Development of Novel Polymeric Materials for Gene Therapy and PH-sensitive Drug Delivery
Development of Novel Polymeric Materials for Gene Therapy and PH-sensitive Drug Delivery

Author: Brian Curtis Anderson

Publisher:

Published: 2002

Total Pages: 360

ISBN-13:

DOWNLOAD EBOOK

The aim of this work was to obtain a fundamental understanding of drug release mechanisms from polymers that undergo thermoreversible gelation and to synthesize new polymers based on these that exhibit both pH and temperature sensitivity. Novel block and random copolymers with cationic character have been developed for drug delivery and gene therapy applications. The development of these materials began with a study of the mechanism of drug release from poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) block copolymers. This study revealed the release rates of drugs from water-soluble hydrogels composed of the PEO-PPO-PEO block copolymer Pluronic F127 was dictated almost solely by the rate of interfacial dissolution at the water/gel interface. A setup was designed to measure drug release from such soluble systems in order to avoid confounding hydrodynamic effects as a result of shear on the delicate polymer/gel interface. This study was followed by a complementary analysis of the effect ionic salts play in the phase transitions and drug release profiles in aqueous F127 solutions. In an attempt to incorporate pH sensitivity into such drug release systems, several block copolymers of poly (N, N-diethylaminoethyl methacrylate) (PDEAEM), PEO, and PPO were synthesized via anionic polymerization. Diblock materials (PEO-b-PDEAEM), either with or without a carboxylic acid endcap, were synthesized and characterized. Tablet dissolution experiments demonstrated pH-sensitivity in their drug release profiles relative to PEO tablets. Pentablock materials (PDEAEM-b-PEO-b-PPO-b-PEO-b-PDEAEM) were synthesized that maintain the thermoreversible gelation and micellization properties of F127 while introducing pH-dependent release from aqueous gels of the copolymer. This is the first example of non-crosslinked materials that exhibit both pH- and temperature-sensitive behavior. Using a similar synthesis route, random copolymers of PDEAEM and poly(poly(ethylene glycol) methyl ether methacrylate)) (PEGME) were synthesized which are water soluble and non-crytotoxic, whereas homopolymers of PDEAEM are neither. These materials have potential as gene therapy vectors.

Molecularly Imprinted Polymers as Advanced Drug Delivery Systems
Molecularly Imprinted Polymers as Advanced Drug Delivery Systems

Author: Zhaosheng Liu

Publisher: Springer Nature

Published: 2021-04-23

Total Pages: 218

ISBN-13: 9811602271

DOWNLOAD EBOOK

This book summarizes the recent advancements for drug delivery systems (DDS) in terms of fundamental principles, rapidly emerging techniques and developing frontiers of molecular imprinting. Especially with the combination of enantioselective molecularly imprinted polymers and water compatible molecularly imprinted polymers, stimuli responsive imprinted DDS have been innovated and applied to dermal delivery, ophthalmic drugs and cancer treatment. This philosophy comprehensively revolutionizes the treatment strategy of human healthcare and provides the possibility to re-trigger in vivo an exhaust system after the complete release of the starting drug cargo, thus enabling precision medicine. To this end, the following unique features will be discussed and concluded: 1) State-of-the-art definition of MIP as drug delivery systems. 2) Advanced techniques and clinical applications of MIP as drug delivery systems in the past decade. 3) Novel frontiers and brand-new technologies, for example, drug delivery devices for zero-order sustained release and stimuli responsive imprinted DDS. 4) Revolutionary impact on dermal delivery, ophthalmic drugs and cancer treatment. 5) Future challenges and perspectives

Polymers in Drug Delivery
Polymers in Drug Delivery

Author: Ijeoma F. Uchegbu

Publisher: CRC Press

Published: 2006-05-19

Total Pages: 426

ISBN-13: 1000611248

DOWNLOAD EBOOK

Together, the nano explosion and the genomic revolution are ushering in a new frontier in drug delivery. In recent years we've seen how polymers can play a crucial role in controlling the rate of drug release, enhancing solubility and uptake, and limiting degradation and toxicity. In the very near future, they may well be used to deliver gene thera