共查询到20条相似文献，搜索用时 15 毫秒
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Yanyan Cui Yaling Wang Lina Zhao 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(38):5118-5125
The native cysteine (Cys)‐Ag3 cluster hydrogel is approved for the first time by both experimental and theoretical studies. From the detailed molecular structure and energy information, three factors are found to ensure the self‐assembly of Cys and Ag3, and result in the hydrogel. First, the Ag–S bonds make Cys and Ag3 form Cys‐Ag3‐Cys monomer. Second, intermolecular hydrogen bonds between carboxyl groups of adjacent monomer push them self‐assembled. Third, more monomer precisely self‐assemble to produce the –[Cys‐Ag3‐Cys]n multimer, e.g., a single molecular chain with the left‐handed helix conformation, via a benign thermodynamic process. These multimers entangle together to form micro‐network to trap water and produce hydorgel in situ. The hydrogen bonds of hydrogel are sensitive to thermal and proton stimuli, and the hydrogel presents lysosome targeting properties via fluorescent imaging with biocompatibility. 相似文献
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Daeyeong Kim Sang A Han Jung Ho Kim Ju-Hyuck Lee Sang-Woo Kim Seung-Wuk Lee 《Advanced materials (Deerfield Beach, Fla.)》2020,32(14):1906989
Biomolecular piezoelectric materials are considered a strong candidate material for biomedical applications due to their robust piezoelectricity, biocompatibility, and low dielectric property. The electric field has been found to affect tissue development and regeneration, and the piezoelectric properties of biological materials in the human body are known to provide electric fields by pressure. Therefore, great attention has been paid to the understanding of piezoelectricity in biological tissues and its building blocks. The aim herein is to describe the principle of piezoelectricity in biological materials from the very basic building blocks (i.e., amino acids, peptides, proteins, etc.) to highly organized tissues (i.e., bones, skin, etc.). Research progress on the piezoelectricity within various biological materials is summarized, including amino acids, peptides, proteins, and tissues. The mechanisms and origin of piezoelectricity within various biological materials are also covered. 相似文献
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Pengyao Xing Hongzhong Chen Huijing Xiang Yanli Zhao 《Advanced materials (Deerfield Beach, Fla.)》2018,30(5)
Controlling the structural parameters in coassembly is crucial for the fabrication of multicomponent functional materials. Here a proof‐of‐concept study is presented to reveal the α‐substituent effect of aromatic amino acids on their selective coassembly with bipyridine binders. With the assistance of X‐ray scattering technique, it is found that individual packing in the solid state as well as bulky effect brought by α‐substitution determines the occurrence of coassembly. A well‐performed hydrogels based on the complexation between certain aromatic amino acids and bipyridine units are successfully constructed, providing unprecedented smart materials with light irradiation‐triggered luminescence. Such hydrogels without the phase separation and photobleaching during light irradiation are able to behave fluorescent imprint materials. This study provides a suitable protocol in rationally designing amino acid residues of short peptides for fabricating self‐assembled multicomponent materials. In addition, this protocol is useful in screening potential functional materials on account of diverse self‐assembly behavior. 相似文献
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《Advanced Materials Technologies》2018,3(7)
Elastic hydrogels have recently attracted remarkable attention because of their unique mechanical and stimulus‐responsive properties. In this work, a novel elastic supramolecular hydrogel for wearable pressure sensors is developed by photocrosslinking polyacrylamide (PAAm) through covalent bonds and hydrogen bonds as well as ionic bonds in the presence of poly(acrylic acid) and Ca2+. Gold nanowires ( Au NWs) are homogeneously mingled with the PAAm hydrogel to attain a conductive composite hydrogel. Using an in‐house optical maskless exposure technology, printable piezoresistive pressure sensors are quickly fabricated by directly patterning the composite hydrogel into microribs on flexible electrodes. The pressure sensors with microrib structures exhibit a bimodal contact mode between Au NWs, which provides a new pathway to engineer the sensor's sensitivity and operation range. In the experiments, the pressure sensor with optimized microrib structures shows not only ultrahigh sensitivity (i.e., 3.71 kPa−1 in the pressure range of 0–2.8 kPa) but also low detection limit (i.e., 0.2 Pa) and long‐term stability. A flexible hand‐shape electrode device and an arterial pulse monitoring sensor are demonstrated to reveal the potentials of such a pressure sensor on wearable device applications. 相似文献
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Self-assembly is a powerful tool for constructing supramolecular materials for many applications, ranging from energy harvesting to biomedicine. Among the methods to prepare supramolecular materials for biomedical applications, enzyme-instructed self-assembly (EISA) has several advantages. Herein, the unique properties and advantages of EISA in preparing biofunctional supramolecular nanomaterials and hydrogels from peptides are highlighted. EISA can trigger molecular self-assembly in situ. Therefore, using overexpression enzymes in disease sites, supramolecular materials can be formed in situ to improve the selectivity and efficacy of the treatment. The precursor may be involved during the EISA process, and it is actually a two-component self-assembly process. The precursor can help to stabilize the assembled nanostructures of hydrophobic peptides formed by EISA. More importantly, the precursor may determine the outcome of molecular self-assembly. Recently, it was also observed that EISA can kinetically control the peptide folding and morphology and cellular uptake behavior of supramolecular nanomaterials. With the combination of other methods to trigger molecular self-assembly, researchers can form supramolecular nanomaterials in a more precise mode and sometimes under spatiotemporal control. EISA is a powerful and unique methodology to prepare supramolecular biofunctional materials that cannot be generated from other common methods. 相似文献
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Xiao Li;Zhecun Guan;Jiayu Zhao;Jinhye Bae; 《Small (Weinheim an der Bergstrasse, Germany)》2024,20(28):2311164
Smart hydrogels are a promising candidate for the development of next-generation soft materials due to their stimuli-responsiveness, deformability, and biocompatibility. However, it remains challenging to enable hydrogels to actively adapt to various environmental conditions like living organisms. In this work, supramolecular additives are introduced to the hydrogel matrix to confer environmental adaptiveness. Specifically, their microstructures, swelling behaviors, mechanical properties, and transparency can adapt to external environmental conditions. Moreover, the presence of hydrogen bonding provides the hydrogel with applicable rheological properties for 3D extrusion printing, thus allowing for the facile preparation of thickness-dependent camouflage and multistimuli responsive complex. The environmentally adaptive hydrogel developed in this study offers new approaches for manipulating supramolecular interactions and broadens the capability of smart hydrogels in information security and multifunctional integrated actuation. 相似文献
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Expanding the polypeptide backbone: hydrogen-bonded conformations in hybrid polypeptides containing the higher homologues of alpha-amino acids. 
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下载免费PDF全文 Sunanda Chatterjee Rituparna Sinha Roy P Balaram 《Journal of the Royal Society Interface》2007,4(15):587-606
Half a century has passed since the hydrogen-bonded secondary structures of polypeptides and proteins were first recognized. An extraordinary wealth of conformational information is now available on peptides and proteins, which are formed of alpha-amino acid residues. More recently, the discovery of well-folded structures in oligopeptides containing beta-amino acids has focused a great deal of current interest on the conformational properties of peptides constructed from higher homologues (omega) of alpha-amino acids. This review examines the nature of intramolecularly hydrogen-bonded conformations of hybrid peptides formed by amino acid residues, with a varying number of backbone atoms. The beta-turn, a ubiquitous structural feature formed by two residue (alphaalpha) segments in proteins and peptides, is stabilized by a 10-atom (C10) intramolecular 4-->1 hydrogen bond. Hybrid turns may be classified by comparison with their alphaalpha counterparts. The available crystallographic information on hydrogen-bonded hybrid turns is surveyed in this review. Several recent examples demonstrate that individual omega-amino acid residues and hybrid dipeptide segments may be incorporated into the regular structures of alpha-peptides. Examples of both peptide helices and hairpins are presented. The present review explores the relationships between folded conformations in hybrid sequences and their counterparts in all alpha-residue sequences. The use of stereochemically constrained omega-residues promises to expand the range of peptide design strategies to include omega-amino acids. This approach is exemplified by well-folded structures like the C12 (alphagamma) and C14 (gammagamma) helices formed in short peptides containing multiply substituted gamma-residues. The achiral gamma-residue gabapentin is a readily accessible building block in the design of peptides containing gamma-amino acids. The construction of globular polypeptide structures using diverse hybrid sequences appears to be a realistic possibility. 相似文献
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Julie Baillet Valérie Desvergnes Aladin Hamoud Laurent Latxague Philippe Barthélémy 《Advanced materials (Deerfield Beach, Fla.)》2018,30(11)
Hybrid synthetic amphiphilic biomolecules are emerging as promising supramolecular materials for biomedical and technological applications. Herein, recent progress in the field of nucleic acid based lipids is highlighted with an emphasis on their molecular design, synthesis, supramolecular properties, physicochemical behaviors, and applications in the field of health science and technology. In the first section, the design and the study of nucleolipids are in focus and then the glyconucleolipid family is discussed. In the last section, recent contributions of responsive materials involving nucleolipids and their use as smart drug delivery systems are discussed. The supramolecular materials generated by nucleic acid based lipids open new challenges for biomedical applications, including the fields of medicinal chemistry, biosensors, biomaterials for tissue engineering, drug delivery, and the decontamination of nanoparticles. 相似文献
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Lili Wang Xiansheng Zhang Yanzhi Xia Xianwei Zhao Zhixin Xue Kunyan Sui Xia Dong Dujin Wang 《Advanced materials (Deerfield Beach, Fla.)》2019,31(41)
Simultaneously achieving strength and toughness in soft materials remains a challenge, especially for physically crosslinked hydrogels with many inactive interaction sites. In this work, inspired by the cooking of thick soup in China, a facile method that includes free water evaporation of the diluted pregel solution followed by crosslinking (WEC) is proposed to fabricate polysaccharide hydrogels. Herein, without the constraints of viscosity and crosslinking, polymer chains can homogenously approach as much as possible, thereby enabling the transformation of inactive supramolecular interaction (H‐bonding and ionic coordination) sites into active sites until reaching the maximum level. Through facilely tuning the concentrating degree, programmed supramolecular interactions, serving as energy‐dissipating sacrificial bonds, impart the hydrogels with strength and toughness over a very wide range, where a “ductile‐to‐tough” transition is discovered to occur first. Using WEC in alginate, the concentration can be as high as 25 wt% without sacrificing processing ability, a result that is significantly beyond common value (3–7 wt%), and the extremely stiff and tough hydrogels are obtained, superior to isotropic alginate hydrogels ever reported. This research offers a facile and versatile strategy to fabricate isotropic polysaccharide hydrogels, which become ideal matrix materials for further fabrication of hybrid or anisotropic hydrogels. 相似文献
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Hafiz Syed Usama Bin Farrukh Frano Milos Ana Díaz Álvarez Samuel Pearson Aránzazu del Campo 《Advanced Materials Interfaces》2024,11(13):2301024
Biofunctionalized polyacrylamide (PAAm) hydrogels are important 2D substrates for studying cell physics and mechanobiology. In this work, an arylmethylsulfone (MS) comonomer is developed that can be incorporated into PAAm gels under aqueous radical polymerization conditions. The resulting hydrogels show similar properties to unmodified PAAm gels, indicating that the comonomer is incorporated without affecting PAAm physical properties. The MS-containing PAAm hydrogels allow efficient conjugation of thiol derivatized biomolecules and require very low comonomer content (2 mM, 0.18 mol% relative to AAm) and thiol incubation amounts (≥ 0.15 µg per gel) to achieve functional densities that elicit cell responses. Compared to carboxyl-functionalized PAAm hydrogels, a 10-fold lower comonomer concentration and a 10-fold lower ligand feed concentration are sufficient to achieve comparable cell adhesion responses. The new comonomer opens up possibilities for efficient and straightforward biofunctionalization of PAAm hydrogels used in cell biophysical studies. 相似文献
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Tao Li Fabio Nudelman Joe W. Tavacoli Hugh Vass Dave J. Adams Alex Lips Paul S. Clegg 《Advanced Materials Interfaces》2016,3(3)
A hydrogel of hydrophobic dipeptides can be used to create a wet foam with long‐term stability. The dipeptide molecules self‐assemble into fiber‐like networks (due to the presence of metal ions) both at air–water interfaces and in the continuous phase. The former creates an interfacial film stabilizing the air bubbles while the latter forms a bulk gel, which prevents bubble movement and retards growth. If the storage modulus (G′) of the bulk hydrogel is sufficiently high it can stop the coarsening of the air bubbles and thus dramatically improve the stability of the foam. Cryogenic scanning electron microscopy and Raman spectra reveals the width of the fibers (200 nm) and that they are held together by hydrogen bonds. In the absence of bubbles, phase separation is observed between a hydrogel and a water‐rich phase; in the foam this can be suppressed provided that the concentration of dipeptides and metal ions are sufficiently high. It is speculated that the resistance of the bubble arrangement to compaction and hence further drainage arrests the process of phase separation. This foam system has the advantages of long stability, low cost, as well as easy preparation; therefore, it has potential applications in food manufacturing, drug delivery, and personal care industries. 相似文献
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3D Cell Culture: Fabrication of Hydrogel Particles of Defined Shapes Using Superhydrophobic‐Hydrophilic Micropatterns (Adv. Mater. 35/2016) 下载免费PDF全文
下载免费PDF全文 Ana I. Neto Konstantin Demir Anna A. Popova Mariana B. Oliveira João F. Mano Pavel A. Levkin 《Advanced materials (Deerfield Beach, Fla.)》2016,28(35):7552-7552
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Elad Arad;Topaz Levi;Gal Yosefi;Itamar Kass;Ifat Cohen-Erez;Ziv Azoulay;Ronit Bitton;Raz Jelinek;Hanna Rapaport; 《Small (Weinheim an der Bergstrasse, Germany)》2024,20(47):2404324
Coassembly of peptide biomaterials offers a compelling avenue to broaden the spectrum of hierarchically ordered supramolecular nanoscale structures that may be relevant for biomedical and biotechnological applications. In this work coassemblies of amphiphilic and oppositely charged, anionic and cationic, β-sheet peptides are studied, which may give rise to a diverse range of coassembled forms. Mixtures of the peptides show significantly lower critical coassembly concentration (CCC) values compared to those of the individual pure peptides. Intriguingly, the highest formation of coassembled fibrils is found to require excess of the cationic peptide whereas equimolar mixtures of the peptides exhibited the maximum folding into β-sheet structures. Mixtures of the peptides coassembled sequentially from solutions at concentrations surpassing each peptide's intrinsic critical assembly concentration (CAC), are also found to require a higher portion of the cationic peptide to stabilize hydrogels. This study illuminates a systematic investigation of oppositely charged β-sheet peptides over a range of concentrations, in solutions and in hydrogels. The results may be relevant to the fundamental understanding of such intricate charge-driven assembly systems and to the formulation of peptide-based nanostructures with diverse functionalities. 相似文献
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Amit Netzer;Avigail Baruch Leshem;Shirel Veretnik;Ilan Edelstein;Ayala Lampel; 《Small (Weinheim an der Bergstrasse, Germany)》2024,20(38):2401665
Membraneless organelles are cellular biomolecular condensates that are formed by liquid–liquid phase separation (LLPS) of proteins and nucleic acids. LLPS is driven by multiple weak attractive forces, including intermolecular interactions mediated by aromatic amino acids. Considering the contribution of π-electron bearing side chains to protein-RNA LLPS, systematically study sought to how the composition of aromatic amino acids affects the formation of heterotypic condensates and their physical properties. For this, a library of minimalistic peptide building blocks is designed containing varying number and compositions of aromatic amino acids. It is shown that the number of aromatics in the peptide sequence affect LLPS propensity, material properties and (bio)chemical stability of peptide/RNA heterotypic condensates. The findings shed light on the contribution of aromatics’ composition to the formation of heterotypic condensates. These insights can be applied for regulation of condensate material properties and improvement of their (bio)chemical stability, for various biomedical and biotechnological applications. 相似文献