Download or read book Bioinspired Catalysis Using Oligourea Helical Foldamers written by Diane Bécart and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Catalysis and folding are two closely interwoven notions in Nature particularly among enzymes, and by extension can be applied to synthetic catalysts designed by chemists. Artificial monomers have been created for two decades to synthesize new oligomeric molecular architectures with a high propensity to fold, which are called foldamers. In many systems, folded structure is stabilized by a strong hydrogen-bonding network, in a similar way to biopolymer structures. These folded backbones may provide significant advantages as catalyst as they could offer cooperativity in ligand binding, a greater stabilization of charged intermediates and then a minimization of entropic cost of the transition state binding. They constitute a class of potential organocatalysts which deserves more investigation. Organocatalysis is an area of strong interest nowadays because of the lower toxicity of the catalysts and meta free procedures, their modularity and easiness to handle them. But generally high loading (5-20 mol%) are needed to perform chemical transformations with good yields and good stereoselectivities. The synergistic effect brought by the well-defined structures of foldamers through the strong hydrogen-bonding network can be in favour of a decrease of the catalyst loading.Oligo(thio)urea foldamers are peptides analogues, with a helical secondary structure, 2.5 residues per turn and 12- and 14-membered H-bond ring and present a macrodipole which can be reinforced through activation with electro-withdrawing group at the positive pole. Binding of anions to oligourea has been studied and was shown to be site specific and not to have any impact on the helical structure thus illustrating the high potential of coordination of negatively charged species to oligourea foldamers. Urea and thiourea small molecules have been widely used as H-bond donors for organocatalysis with very satisfying results. These concepts are the basis of the development of an innovative organocatalyst with oligo(thio)urea foldamers, acting through H-bond activation. A structure-activity relationship study combining an extended substrate scope and NMR mechanistic studies was performed allowing delineation of the principles governing oligourea foldamer-based catalysis.

Download or read book Organocatalytic Enantioselective Conjugate Addition Reactions written by Dolores Badia and published by Royal Society of Chemistry. This book was released on 2010 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, unique in its field, is a comprehensive description of all the methodologies reported for carrying out conjugate addition reactions in a stereoselective way, using small chiral organic molecules as catalysts (organocatalysts). In the last 3-4 years, this has been a rapidly growing field in organic chemistry, and many papers have appeared reporting excellent protocols for carrying out these highly efficient transformations that compete well with other classical approachse using transition metal catalysts. A particularly attractive feature of this transformation relies upon the fact that the conjugate addition (Michael and Hetero-Michael reactions) is an extraoridinarily effective means to initiate cascade processes which result in the formation of complex molecules from very small and simple starting blocks. The book, written by noted experts, covers all recent advances in this not topic, and provides a good state-of-the-art review for organic chemists working in this field and all those who wish to start projects in this area. The Series is intended to provide an accessible reference for postgraduates and industrialists working in the field of catalysis and its applications. Books will be produced either as monographs or reference handbooks. The Series will cover research developments and applications of catalysis, in both academia and industry.

Download or read book Peptide Materials written by Carlos Aleman and published by Wiley. This book was released on 2013-05-13 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Peptides are the building blocks of the natural world; with varied sequences and structures, they enrich materials producing more complex shapes, scaffolds and chemical properties with tailorable functionality. Essentially based on self-assembly and self-organization and mimicking the strategies that occur in Nature, peptide materials have been developed to accomplish certain functions such as the creation of specific secondary structures (a- or 310-helices, b-turns, b-sheets, coiled coils) or biocompatible surfaces with predetermined properties. They also play a key role in the generation of hybrid materials e.g. as peptide-inorganic biomineralized systems and peptide/polymer conjugates, producing smart materials for imaging, bioelectronics, biosensing and molecular recognition applications. Organized into four sections, the book covers the fundamentals of peptide materials, peptide nanostructures, peptide conjugates and hybrid nanomaterials, and applications with chapters including: Properties of peptide scaffolds in solution and on solid substrates Nanostructures, peptide assembly, and peptide nanostructure design Soft spherical structures obtained from amphiphilic peptides and peptide-polymer hybrids Functionalization of carbon nanotubes with peptides Adsorption of peptides on metal and oxide surfaces Peptide applications including tissue engineering, molecular switches, peptide drugs and drug delivery Peptide Materials: From Nanostructures to Applications gives a truly interdisciplinary review, and should appeal to graduate students and researchers in the fields of materials science, nanotechnology, biomedicine and engineering as well as researchers in biomaterials and bio-inspired smart materials.

Download or read book Supramolecular Chemistry in Water written by Stefan Kubik and published by John Wiley & Sons. This book was released on 2019-09-03 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides deep insight into the concepts and recent developments in the area of supramolecular chemistry in water Written by experts in their respective field, this comprehensive reference covers various aspects of supramolecular chemistry in water?from fundamental aspects to applications. It provides readers with a basic introduction to the current understanding of the properties of water and how they influence molecular recognition, and examines the different receptor types available in water and the types of substrates that can be bound. It also looks at areas to where they can be applied, such as materials, optical sensing, medicinal imaging, and catalysis. Supramolecular Chemistry in Water offers five major sections that address important topics like water properties, molecular recognition, association and aggregation phenomena, optical detection and imaging, and supramolecular catalysis. It covers chemistry and physical chemistry of water; water-mediated molecular recognition; peptide and protein receptors; nucleotide receptors; carbohydrate receptors; and ion receptors. The book also teaches readers all about coordination compounds; self-assembled polymers and gels; foldamers; vesicles and micelles; and surface-modified nanoparticles. In addition, it provides in-depth information on indicators and optical probes, as well as probes for medical imaging. -Covers, in a timely manner, an emerging area in chemistry that is growing more important every day -Addresses topics such as molecular recognition, aggregation, catalysis, and more -Offers comprehensive coverage of everything from fundamental aspects of supramolecular chemistry in water to its applications -Edited by one of the leading international scientists in the field Supramolecular Chemistry in Water is a one-stop-resource for all polymer chemists, catalytic chemists, biochemists, water chemists, and physical chemists involved in this growing area of research.

Download or read book Foldamers written by Stefan Hecht and published by John Wiley & Sons. This book was released on 2007-09-24 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: This truly comprehensive treatise of foldamers, from synthesis to applications in bio-, material-, and nanoscience is at once an introduction to the topic, while providing in-depth accounts on various aspects clearly aimed at the specialist. The book is clearly structured, with the first part concentrating on structure and foldamer design concepts, while the second part covers functional aspects from properties to applications. The international team of expert authors provides overviews of synthetic approaches as well as analytical techniques.

Download or read book Hydrogen Bonding in Organic Synthesis written by Petri M. Pihko and published by John Wiley & Sons. This book was released on 2009-09-09 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first comprehensive overview of the rapidly growing field emphasizes the use of hydrogen bonding as a tool for organic synthesis, especially catalysis. As such, it covers such topics as enzyme chemistry, organocatalysis and total synthesis, all unified by the unique advantages of hydrogen bonding in the construction of complex molecules from simple precursors. Providing everything you need to know, this is a definite must for every synthetic chemist in academia and industry.

Download or read book New Trends in Macromolecular and Supramolecular Chemistry for Biological Applications written by Marc J.M. Abadie and published by Springer. This book was released on 2022-05-29 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This contributed volume applies the insights of supramolecular chemistry to biomedical applications such as ions/water transport through nano-scale channels, gene therapy, tissue engineering and drug delivery, to cite some of the major investigations.The challenge is to understand the mechanisms of transport through tissues particularly in the therapeutic treatment of a disease where the active drug must be delivered directly to diseased cells without affecting healthy cells. As a result, smaller quantities of active substances can be used to treat the disease. Another interest concerns new ways to administer gene therapy. If genes are often delivered to their target cells by adapted viruses, the supramolecular non-viral ‘vectors’ using dynamic nano-frameworks and nano-structures are presented. In addition, it is important to reconstruct damaged tissues by mimicking natural processes in cells and polymers, such as tissue engineering and self-healing. Different options are here discussed: e.g. hydrogels based on chitosan, a carbohydrate polymer, are proving especially promising for tissue engineering and drug delivery. For controlled delivery of drugs or other biologically active compounds, hydrogels sensitive to the most important stimuli in the human body, such as temperature, pH, ionic strength, glucose and biomolecules released by the organism in pathological conditions have been developed. Finally, to assist and validate the experimental studies, computer modelling and simulations of large-sized molecular structures and systems using different molecular dynamics and quantum mechanical techniques are developed based on the experimental and chemistry synthesis. This book is of great interest for graduate students, researchers and health professionals interested in acquiring a better understanding of the mechanisms of medical treatments. In addition, it provides numerous tools to develop better therapies for human diseases.

Download or read book Artificial Water Channels written by Royal Society of Chemistry and published by Faraday Discussions. This book was released on 2018 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume will focus on the chemistry, physics and material sciences contributions toward the rapidly evolving field of artificial water channels. The development of synthetic biomimetic artificial water-channels and pores is key for a better understanding of the natural function of protein channels. It is hoped to offer new strategies to generate highly selective, advanced materials for water purification systems. While synthetic chemists have produced sophisticated architectures able to confine water clusters, most water channel based work is being conducted with natural protein channels as selectivity components, embedded in the diverse arrays of bio-assisted artificial systems. Experimental results have demonstrated that natural biomolecules can be used as bio-assisted building blocks for the construction of highly selective water transport through artificial channels. Moving to simpler water-channel systems offers a chance to better understand mechanistic and structural behaviours and to uncover novel interactive water channels that might parallel those in biomolecular systems. In this volume the topics covered include: Structure and function of natural proteins for water transport Biomimetic water channels The modelling and enhancement of water hydrodynamics Applications to water transport systems tic and structural behaviours and to uncover novel interactive water channels that might parallel those in biomolecular systems. In this volume the topics covered include: Structure and function of natural proteins for water transport Biomimetic water channels The modelling and enhancement of water hydrodynamics Applications to water transport systems

Download or read book Organic Chemistry of Enzyme Catalyzed Reactions Revised Edition written by Richard B. Silverman and published by Elsevier. This book was released on 2002-03-07 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Organic Chemistry of Enzyme-Catalyzed Reactions is not a book on enzymes, but rather a book on the general mechanisms involved in chemical reactions involving enzymes. An enzyme is a protein molecule in a plant or animal that causes specific reactions without itself being permanently altered or destroyed. This is a revised edition of a very successful book, which appeals to both academic and industrial markets. - Illustrates the organic mechanism associated with each enzyme-catalyzed reaction - Makes the connection between organic reaction mechanisms and enzyme mechanisms - Compiles the latest information about molecular mechanisms of enzyme reactions - Accompanied by clearly drawn structures, schemes, and figures - Includes an extensive bibliography on enzyme mechanisms covering the last 30 years - Explains how enzymes can accelerate the rates of chemical reactions with high specificity - Provides approaches to the design of inhibitors of enzyme-catalyzed reactions - Categorizes the cofactors that are appropriate for catalyzing different classes of reactions - Shows how chemical enzyme models are used for mechanistic studies - Describes catalytic antibody design and mechanism - Includes problem sets and solutions for each chapter - Written in an informal and didactic style

Download or read book Nanostructures for Antimicrobial Therapy written by Anton Ficai and published by Elsevier. This book was released on 2017-05-29 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructures for Antimicrobial Therapy discusses the pros and cons of the use of nanostructured materials in the prevention and eradication of infections, highlighting the efficient microbicidal effect of nanoparticles against antibiotic-resistant pathogens and biofilms. Conventional antibiotics are becoming ineffective towards microorganisms due to their widespread and often inappropriate use. As a result, the development of antibiotic resistance in microorganisms is increasingly being reported. New approaches are needed to confront the rising issues related to infectious diseases. The merging of biomaterials, such as chitosan, carrageenan, gelatin, poly (lactic-co-glycolic acid) with nanotechnology provides a promising platform for antimicrobial therapy as it provides a controlled way to target cells and induce the desired response without the adverse effects common to many traditional treatments. Nanoparticles represent one of the most promising therapeutic treatments to the problem caused by infectious micro-organisms resistant to traditional therapies. This volume discusses this promise in detail, and also discusses what challenges the greater use of nanoparticles might pose to medical professionals. The unique physiochemical properties of nanoparticles, combined with their growth inhibitory capacity against microbes has led to the upsurge in the research on nanoparticles as antimicrobials. The importance of bactericidal nanobiomaterials study will likely increase as development of resistant strains of bacteria against most potent antibiotics continues. - Shows how nanoantibiotics can be used to more effectively treat disease - Discusses the advantages and issues of a variety of different nanoantibiotics, enabling medics to select which best meets their needs - Provides a cogent summary of recent developments in this field, allowing readers to quickly familiarize themselves with this topic area

Download or read book Design of Hybrid Molecules for Drug Development written by Michael Decker and published by Elsevier. This book was released on 2017-04-05 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design of Hybrid Molecules for Drug Development reviews the principles, advantages, and limitations involved with designing these groundbreaking compounds. Beginning with an introduction to hybrid molecule design and background as to their need, the book goes on to explore a range of important hybrids, with hybrids containing natural products, molecules containing NO- and H2S-donors, dual-acting compounds acting as receptor ligands and enzyme inhibitors, and the design of photoresponsive drugs all discussed. Drawing on practical case studies, the hybridization of molecules for development as treatments for a number of key diseases is then outlined, including the design of hybrids for Alzheimer's, cancer, and malaria. With its cutting-edge reviews of breaking developments in this exciting field, the book offers a novel approach for all those working in the design, development, and administration of drugs for a range of debilitating disorders. - Highlights an approach unimpaired by the limitations of the classical search for lead structures - one of the core problems in modern drug development processes, making the content of high relevance for both academic and non-academic drug development processes - Pulls together research and design techniques in a novel way to give researchers the best possible platform from which to review the approaches and techniques applied - Compares the advantages and disadvantages of these compounds - Includes the very latest developments, such as photoactivatable and photo-responsive drugs

Download or read book Advances in Metal Carbene Chemistry written by U. Schubert and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are only few topics in organometallic chemistry, which have stimulated research activities in as many areas, as transition-metal carbene (alkylidene) complexes. About 25 years after the first planned synthesis of a carbene complex in E.O. Fischer's laboratory in Munich the NATO Advanced Research Workshop on Transition-Metal Carbene Complexes was the first meeting which,brought together scientists from different disciplines to discuss inorganic, organic, theoretical structural catalysis-related aspects of metal carbene chemistry. The 70th birthday of Professor E.O. Fischer was a good occasion for this enterprise. The organizers of the meeting (K.D. Dotz, Marburg; F.R. KreiBl, Munchen; U. Schubert, Wurzburg) were encouraged by the fact that most of the leading scientists in this area were able to participate in the workshop. The very high standard of the contributions is reflected in this book, which contains papers from the majority of the participants. The Proceedings show the state of the art in metal carbene chemistry and will hopefully be a landmark in the development of this area of chemistry. Generous financial support for the workshop and for the preparation of this book was provided by the Scientific Affairs Division of NATO and some companies. The organizers also acknowledge the efforts of the staff of the Bildungs zentrum der Hans-Seidel-Stiftung in Wild bad Kreuth for creating a pleasant and stimulating atmosphere during the conference.

Download or read book Peptidomimetics in Organic and Medicinal Chemistry written by Antonio Guarna and published by John Wiley & Sons. This book was released on 2014-04-07 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: A peptidomimetic is a small protein-like chain designed to mimic a peptide with adjusted molecular properties such as enhanced stability or biological activity. It is a very powerful approach for the generation of small-molecule-based drugs as enzyme inhibitors or receptor ligands. Peptidomimetics in Organic and Medicinal Chemistry outlines the concepts and synthetic strategies underlying the building of bioactive compounds of a peptidomimetic nature. Topics covered include the chemistry of unnatural amino acids, peptide- and scaffold-based peptidomimetics, amino acid-side chain isosteres, backbone isosteres, dipeptide isosteres, beta-turn peptidomimetics, proline-mimetics as turn inducers, cyclic scaffolds, amino acid surrogates, and scaffolds for combinatorial chemistry of peptidomimetics. Case studies in the hit-to-lead process, such as the development of integrin ligands and thrombin inhibitors, illustrate the successful application of peptidomimetics in drug discovery.

Download or read book Fibrous Proteins Structures and Mechanisms written by David A.D. Parry and published by Springer. This book was released on 2017-01-18 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the readers with an up-to-date review of the design, structure and function of a representative selection of fibrous proteins in both health and disease. The importance of the α-helical coiled coil, a conformational motif based on the heptad repeat in the amino acid sequence of all α-fibrous proteins (and parts of some globular proteins) is underlined by three Chapters devoted to its design, structure, function and topology. Specific proteins covered in the text and which depend on the coiled coil for their structure and function, include the intermediate filament proteins, tropomyosin, myosin, paramyosin, fibrin and members of the spectrin superfamily. Also described are fibrous proteins based on the β-pleated sheet and collagen conformations. Recombinant structural proteins, especially of silk and collagen, are discussed in the context of developing new biomaterials with varied applications. Established researchers and postgraduate students in the fields of protein chemistry, biochemistry and structural biophysics will find Fibrous Proteins: Structures and Mechanisms to be an invaluable collection of topical reviews that describe the basic advances made in the field of fibrous proteins over the past decade. This book, written by recognized authorities in the field, provides a clear account of the current status of fibrous protein research and, in addition, establishes the basis for deciding the most appropriate directions for future activity, including the applications of protein engineering and the commercial exploitation of new biomaterials.

Download or read book Axially Chiral Compounds written by Bin Tan and published by John Wiley & Sons. This book was released on 2021-11-22 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Axially Chiral Compounds Explore this comprehensive and current volume summarizing the characteristics, synthesis, and applications of axial chirality Appearing widely in natural products, biologically active molecules, asymmetric chemistry, and material science, axially chiral motifs constitute the core backbones of the majority of chiral ligands and organocatalysts in asymmetric catalysis. In a new work of particular relevance to synthetic chemists, Axially Chiral Compounds: Asymmetric Synthesis and Applications delivers a clearly structured and authoritative volume covering the classification, characteristics, synthesis, and applications of axial chirality. A must read for every synthetic chemist practicing today, the book follows the development history, research status, and applications of axial chirality. An introductory chapter familiarizes the reader with foundational material before the distinguished authors describe the different classes and the synthesis of axial chiral compounds used in asymmetric synthesis. The book concludes with a focus on the applications of chiral ligands, chiral catalysts, and materials. Readers will also benefit from the inclusion of: A thorough introduction to asymmetric synthesis, including biaryls atropisomers, heterobiaryls atropisomers, and non-biaryls atropisomers Explorations of chiral allene, spiro skeletons, and natural products Practical discussions of asymmetric transformation, chiral ligands, and chiral catalysts An examination of miscellaneous applications of axially chiral compounds Perfect for organic chemists, chemists working with or on organometallics, catalytic chemists, and materials scientists, Axially Chiral Compounds: Asymmetric Synthesis and Applications will also earn a place in the libraries of natural products chemists who seek a one-stop reference for compounds exhibiting axial chirality.

Download or read book Macromolecular Self Assembly written by Laurent Billon and published by John Wiley & Sons. This book was released on 2016-08-25 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes techniques of synthesis and self-assembly of macromolecules for developing new materials and improving functionality of existing ones. Because self-assembly emulates how nature creates complex systems, they likely have the best chance at succeeding in real-world biomedical applications. • Employs synthetic chemistry, physical chemistry, and materials science principles and techniques • Emphasizes self-assembly in solutions (particularly, aqueous solutions) and at solid-liquid interfaces • Describes polymer assembly driven by multitude interactions, including solvophobic, electrostatic, and obligatory co-assembly • Illustrates assembly of bio-hybrid macromolecules and applications in biomedical engineering

Download or read book Fibrous Proteins Coiled Coils Collagen and Elastomers written by David A.D. Parry and published by Gulf Professional Publishing. This book was released on 2005-05-06 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibrous Protein: Coiled-Coils, Collagen and Elastomers is the first of a three-part series on Fibrous Proteins. The books are based on a very successful workshop in Alpbach, Austria on the general topic of Fibrous Proteins that gave rise to the award winning issue of Journal of Structural Biology. Part II will contain an extensive discussion of Molecular Motors and Muscle, Part III on Amyloids, Prions and Beta Proteins. Advances in Protein Chemistry is available online on ScienceDirect - full-text online of volumes 53 onwards. Reveals new structural and functional aspects of fibrous proteins Based on Fibrous Protein workshop in Alpbach, Austria that gave rise to 2003 Nobel Prize winners in Chemistry