Bibliographies thématiques / Encapsulation, self assembly, amphiphilic copolymers, perfume

Littérature scientifique sur le sujet « Encapsulation, self assembly, amphiphilic copolymers, perfume »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Encapsulation, self assembly, amphiphilic copolymers, perfume"

Anas, Mahammad, Somdeb Jana et Tarun K. Mandal. « Vesicular assemblies of thermoresponsive amphiphilic polypeptide copolymers for guest encapsulation and release ». Polymer Chemistry 11, n^o 16 (2020) : 2889–903. http://dx.doi.org/10.1039/d0py00135j.

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Liu, Lichao, Leilei Rui, Yun Gao et Weian Zhang. « Self-assembly and disassembly of a redox-responsive ferrocene-containing amphiphilic block copolymer for controlled release ». Polymer Chemistry 6, n^o 10 (2015) : 1817–29. http://dx.doi.org/10.1039/c4py01289e.

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The synthesis and self-assembly of ferrocene-containing block copolymers PEG-b-PMAEFc, and the encapsulation and redox-responsive release of a model molecule (rhodamine B) upon external redox stimuli (H₂O₂).

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McIntosh, J. Trevor, Ali Nazemi, Colin V. Bonduelle, Sebastien Lecommandoux et Elizabeth R. Gillies. « Synthesis, self-assembly, and degradation of amphiphilic triblock copolymers with fully photodegradable hydrophobic blocks ». Canadian Journal of Chemistry 93, n^o 1 (janvier 2015) : 126–33. http://dx.doi.org/10.1139/cjc-2014-0263.

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The development of stimuli-responsive materials is of significant interest for many applications including drug delivery, medical imaging, sensors, and microfluidic devices. Among the available stimuli, light is particularly attractive as it can be applied with high spatial and temporal resolution. We describe here the synthesis of amphiphilic triblock copolymers composed of poly(ethylene glycol) and a hydrophobic block containing o-nitrobenzyl esters throughout the backbone using copper-catalyzed azide–alkyne cycloaddition chemistry. These materials were designed to have a high weight fraction of the hydrophobic block to favour nonmicellar aggregates. The self-assembly in water was studied using nanoprecipitation and the resulting assemblies were characterized by dynamic light scattering and transmission electron microscopy. Under optimized conditions, it was possible to prepare polymer vesicles, commonly referred to as polymersomes, with diameters of approximately 100 nm. The degradation of these materials in response to UV light was studied by spectroscopy, light scattering, and electron microscopy, demonstrating that the vesicles were broken down. These results suggest the potential of these materials for applications such as encapsulation and release.

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Kafetzi, Martha, et Stergios Pispas. « Effects of Hydrophobic Modifications on the Solution Self-Assembly of P(DMAEMA-co-QDMAEMA)-b-POEGMA Random Diblock Copolymers ». Polymers 13, n^o 3 (21 janvier 2021) : 338. http://dx.doi.org/10.3390/polym13030338.

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In this work, the synthesis and the aqueous solution self-assembly behavior of novel partially hydrophobically modified poly(2-(dimethylamino) ethyl methacrylate)-b-poly(oligo(ethylelene glycol) methyl ether methacrylatetabel) pH and temperature responsive random diblock copolymers (P(DMAEMA-co-Q6/12DMAEMA)-b-POEGMA), are reported. The chemical modifications were accomplished via quaternization with 1-iodohexane (Q6) and 1-iodododecane (Q12) and confirmed by 1H-NMR spectroscopy. The successful synthesis of PDMAEMA-b-POEGMA precursor block copolymers was conducted by RAFT polymerization. The partial chemical modification of the diblocks resulted in the permanent attachment of long alkyl chains on the amine groups of the PDMAEMA block and the presence of tertiary and quaternary amines randomly distributed within the PDMAEMA block. Light scattering techniques confirmed that the increased hydrophobic character results in the formation of nanoaggregates of high mass and tunable pH and temperature response. The characteristics of the aggregates are also affected by the aqueous solution preparation protocol, the nature of the quaternizing agent and the quaternization degree. The incorporation of long alkyl chains allowed the encapsulation of indomethacin within the amphiphilic diblock copolymer aggregates. Nanostructures of increased size were detected due to the encapsulation of indomethacin into the interior of the hydrophobic domains. Drug release studies demonstrated that almost 50% of the encapsulated drug can be released on demand by aid of ultrasonication.

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Vlassi, Eleni, Aristeidis Papagiannopoulos et Stergios Pispas. « Amphiphilic A x B y mikto‐arm star copolymers with PLMA and POEGMA arms : Self‐assembly and drug encapsulation ». Journal of Polymer Science 59, n^o 9 (8 mars 2021) : 775–86. http://dx.doi.org/10.1002/pol.20210082.

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Chen, Yihuang, Zewei Wang, Yanjie He, Young Jun Yoon, Jaehan Jung, Guangzhao Zhang et Zhiqun Lin. « Light-enabled reversible self-assembly and tunable optical properties of stable hairy nanoparticles ». Proceedings of the National Academy of Sciences 115, n^o 7 (31 janvier 2018) : E1391—E1400. http://dx.doi.org/10.1073/pnas.1714748115.

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The ability to dynamically organize functional nanoparticles (NPs) via the use of environmental triggers (temperature, pH, light, or solvent polarity) opens up important perspectives for rapid and convenient construction of a rich variety of complex assemblies and materials with new structures and functionalities. Here, we report an unconventional strategy for crafting stable hairy NPs with light-enabled reversible and reliable self-assembly and tunable optical properties. Central to our strategy is to judiciously design amphiphilic star-like diblock copolymers comprising inner hydrophilic blocks and outer hydrophobic photoresponsive blocks as nanoreactors to direct the synthesis of monodisperse plasmonic NPs intimately and permanently capped with photoresponsive polymers. The size and shape of hairy NPs can be precisely tailored by modulating the length of inner hydrophilic block of star-like diblock copolymers. The perpetual anchoring of photoresponsive polymers on the NP surface renders the attractive feature of self-assembly and disassembly of NPs on demand using light of different wavelengths, as revealed by tunable surface plasmon resonance absorption of NPs and the reversible transformation of NPs between their dispersed and aggregated states. The dye encapsulation/release studies manifested that such photoresponsive NPs may be exploited as smart guest molecule nanocarriers. By extension, the star-like block copolymer strategy enables the crafting of a family of stable stimuli-responsive NPs (e.g., temperature- or pH-sensitive polymer-capped magnetic, ferroelectric, upconversion, or semiconducting NPs) and their assemblies for fundamental research in self-assembly and crystallization kinetics of NPs as well as potential applications in optics, optoelectronics, magnetic technologies, sensory materials and devices, catalysis, nanotechnology, and biotechnology.

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Liu, Jia, Juan Li et Tingting Liu. « Fabrication of Mixed Polymeric Micelles Based on Stimuli-Responsive Amphiphilic Copolymers for Drug Delivery and Controlled Release ». Nano 15, n^o 03 (mars 2020) : 2050040. http://dx.doi.org/10.1142/s179329202050040x.

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In this report, mixed polymeric micelles (MPMs) system self-assembled from two kinds of cholesterol-grafted amphiphilic block copolymers cholesterol modified poly ([Formula: see text]-amino esters)-grafted disulfide poly (ethylene glycol) methyl ether (PAE(-ss-mPEG)-[Formula: see text]-Chol) and poly([Formula: see text]-amino ester)-g-poly(ethylene glycol) methyl ether-cholesterol (PAE-[Formula: see text]-mPEG-Chol) were prepared for drug delivery and controlled release with pH and redox-responsibilities. The self-assembly of two block copolymers was evaluated by measurement of critical micelle concentration (CMC) values using fluorescence spectroscopy. The hydrodynamic diameter, polydispersity index (PDI) and zeta-potential of MPMs in aqueous were recorded by dynamic light scattering (DLS) at different conditions. Doxorubicin (DOX) was efficiently encapsulated in the micellar core by the hydrophobic interaction. The drug loading content (LC) and encapsulation efficacy (EE) of MPMs with different formulations were evaluated. The DOX was released due to the swelling and disassembly of MPMs induced by low pH and high glutathione (GSH) concentrations. The in vitro results demonstrated that drug release rate and cumulative release were obviously dependent on pH values and reducing agents. The results showed that the MPMs could be the potential anticancer drug delivery carriers with pH/redox-triggered drug release profile.

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Shao, Jingxin, Shoupeng Cao, Hanglong Wu, Loai K. E. A. Abdelmohsen et Jan C. M. van Hest. « Therapeutic Stomatocytes with Aggregation Induced Emission for Intracellular Delivery ». Pharmaceutics 13, n^o 11 (2 novembre 2021) : 1833. http://dx.doi.org/10.3390/pharmaceutics13111833.

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Bowl-shaped biodegradable polymersomes, or stomatocytes, have much potential as drug delivery systems, due to their intriguing properties, such as controllable size, programmable morphology, and versatile cargo encapsulation capability. In this contribution, we developed well-defined therapeutically active stomatocytes with aggregation-induced emission (AIE) features by self-assembly of biodegradable amphiphilic block copolymers, comprising poly(ethylene glycol) (PEG) and AIEgenic poly(trimethylene carbonate) (PTMC) moieties. The presence of the AIEgens endowed the as-prepared stomatocytes with intrinsic fluorescence, which was employed for imaging of cellular uptake of the particles. It simultaneously enabled the photo-mediated generation of reactive oxygen species (ROS) for photodynamic therapy. The potential of the therapeutic stomatocytes as cargo carriers was demonstrated by loading enzymes (catalase and glucose oxidase) in the nanocavity, followed by a cross-linking reaction to achieve stable encapsulation. This provided the particles with a robust motile function, which further strengthened their therapeutic effect. With these unique features, enzyme-loaded AIEgenic stomatocytes are an attractive platform to be exploited in the field of nanomedicine.

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Qi, Lingling, Chao Liu, Yingying Zhang, Zheao Zhang, Hongxia Duan, Heming Zhao, Xin Xin et al. « Development of Mitomycin C-Loaded Nanoparticles Prepared Using the Micellar Assembly Driven by the Combined Effect of Hydrogen Bonding and π–π Stacking and Its Therapeutic Application in Bladder Cancer ». Pharmaceutics 13, n^o 11 (25 octobre 2021) : 1776. http://dx.doi.org/10.3390/pharmaceutics13111776.

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Micelle is mainly used for drug delivery and is prepared from amphiphilic block copolymers. It can be formed into an obvious core-shell structure that can incorporate liposoluble drugs. However, micelles are not suitable for the encapsulation of water-soluble drugs, and it is also difficult to maintain stability in the systemic circulation. To solve these problems, a type of polymer material, Fmoc-Lys-PEG and Fmoc-Lys-PEG-RGD, was designed and synthesized. These copolymers could self-assemble into micelles driven by π–π stacking and the hydrophobic interaction of 9-fluorenylmethoxycarbony (Fmoc) and, at the same time, form a framework for a hydrogen-bonding environment in the core. Mitomycin C (MMC), as a water-soluble drug, can be encapsulated into micelles by hydrogen-bonding interactions. The interaction force between MMC and the polymers was analyzed by molecular docking simulation and Fourier transform infrared (FTIR). It was concluded that the optimal binding conformation can be obtained, and that the main force between the MMC and polymers is hydrogen bonding. Different types of MMC nanoparticles (NPs) were prepared and the physicochemical properties of them were systematically evaluated. The pharmacodynamics of the MMC NPs in vitro and in vivo were also studied. The results show that MMC NPs had a high uptake efficiency, could promote cell apoptosis, and had a strong inhibitory effect on cell proliferation. More importantly, the as-prepared NPs could effectively induce tumor cell apoptosis and inhibit tumor growth and metastasis in vivo.

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Thèses sur le sujet "Encapsulation, self assembly, amphiphilic copolymers, perfume"

Sofroniou, Constantina. « Self-assembly of copolymers and capsule formation in complex fluids ». Doctoral thesis, 2022. http://hdl.handle.net/2158/1263914.

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Currently in the market there is the need of more environmentally friendly encapsulation technologies, less time and energy consuming processes, and release of actives, such as perfume, via other triggers besides the classic mechanical fracturing. This PhD project aims at the development of a new perfume encapsulation technology based on soft polymeric systems. Here, amphiphilic graft-copolymers with improved environmental footprint are tested as possible candidates for perfume encapsulation with potential use in commercial liquid home- and personal-care products.

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Seymany, Kéo-Oudone. « Deposition of soft polymeric capsules on surfaces for prolonged active release ». Doctoral thesis, 2022. https://hdl.handle.net/2158/1290368.

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It is evident that current encapsulation methods involve a great amount of energy and materials to produce perfume carriers contained in home- and beauty-care products. Additionally, the deposition and retention of perfumes on target surfaces remains a challenge in cleaning processes as substrates are subjected to multiple rinses during the washing procedure. Therefore, the development of a new encapsulation technology presenting an improved sustainability profile and able to efficiently deliver perfumes on surfaces would contribute to a more effective use of materials, thus significantly lowering the environmental footprint of consumer goods. This Thesis deals with the investigation of soft polymeric microcapsules for the delivery of active ingredients to surfaces during washing processes. The soft microcapsules described here exploit the self-assembly properties of Soluplus®, an amphiphilic poly(ethylene glycol)-poly(vinyl acetate)-poly(vinyl caprolactam) (PEG-PVAc-PVCL) graft copolymer, to encapsulate fragrances and deliver them to various target surfaces. The results presented in this work participate in the expansion of the knowledge on the use of amphiphilic polymers for the targeted delivery of hydrophobic active compounds such as perfumes promoted by microcapsules and/or polymeric micelles.

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