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Effect Of Rotovapor In Pseudopolyrotaxanes Formed With Cyclodextrins

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Pseudopolyrotaxane Formation in the Synthesis of …

Pseudopolyrotaxane Formation in the Synthesis of …

Numerous groups have reported the use of cyclodextrin (CD)-based polymers for drug delivery applications due to their capacity to form inclusions with small molecule drugs, delaying the rate of drug release beyond that of diffusion alone (termed "affinity-based" drug delivery). Herein we demonstrate …

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Solvent-Free Formation of Cyclodextrin-Based …

Solvent-Free Formation of Cyclodextrin-Based …

2.1. Mechanism of the PPR Formation. In the literature, the formation of the PPR in the solid phase has usually been treated as a single-step process, described in terms of the changes occurring in the crystalline structure of the CD, which passes from the cage-structure to a channel-like structure [].In the scheme here proposed, the global reaction is split into two …

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Solvent-Free Formation of Cyclodextrin-Based …

Solvent-Free Formation of Cyclodextrin-Based …

Pseudopolyrotaxanes (PPRs) are supramolecular structures consisting of macrocycles able to thread on a linear polymer chain in a reversible, non-covalent way, often referred to in the literature as "molecular necklaces". While the synthesis and reaction mechanisms of these structures in solution hav …

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Cyclodextrin-Based Pseudopolyrotaxanes as …

Cyclodextrin-Based Pseudopolyrotaxanes as …

[24][25] [26] The supramolecular assembly (pseudopolyrotaxanes) from cyclodextrins and polymers was also found to regulate the pore structure of silica material via pH value, that is, from ...

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Solvent-Free Formation of Cyclodextrin-Based …

Solvent-Free Formation of Cyclodextrin-Based …

Dec 08, 2021 · Pseudopolyrotaxanes (PPRs) are supramolecular structures consisting of macrocycles able to thread on a linear polymer chain in a reversible, non-covalent way, often referred to in the literature as “molecular necklaces”. While the synthesis and reaction mechanisms of these structures in solution have been widely described, their solvent …

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Solvent-Free Formation of Cyclodextrin-Based Pseudopolyrotaxanes …

Solvent-Free Formation of Cyclodextrin-Based Pseudopolyrotaxanes …

Dec 08, 2021 · Pseudopolyrotaxanes (PPRs) are supramolecular structures consisting of macrocycles able to thread on a linear polymer chain in a reversible, non-covalent way, often referred to in the literature as “molecular necklaces”. While the synthesis and reaction mechanisms of these structures in solution have been widely described, their solvent …

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Reversible 2D Pseudopolyrotaxanes Based On Cyclodextrins and …

Reversible 2D Pseudopolyrotaxanes Based On Cyclodextrins and …

Dec 06, 2006 · In this paper, a pseudorotaxane (2) was synthesized by reaction of cucurbit [6]uril with 6-[(6-aminohexyl)amino]-6-deoxy-β-cyclodextrin chloride. Subsequently, pseudorotaxanes 2 were further assembled to form a 2D pseudopolyrotaxane (3) through an α,ω-PPG2000 diamino polymer threading the cavities of cyclodextrins in 2, and the resulting pseudopolyrotaxane …

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Solvent-Free Formation of Cyclodextrin-Based …

Solvent-Free Formation of Cyclodextrin-Based …

Abstract: Pseudopolyrotaxanes (PPRs) are supramolecular structures consisting of macrocycles able to thread on a linear polymer chain in a reversible, non-covalent way, often referred to in the literature as “molecular necklaces”. While the synthesis and reaction mechanisms of …

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Chain architecture and flexibility of α-cyclodextrin/PEG …

Chain architecture and flexibility of α-cyclodextrin/PEG …

Apr 22, 2015 · Several α-CDs are spontaneously threaded onto a PEG chain to form pseudopolyrotaxanes in aqueous solutions. 3 When both ends of the PEG in pseudopolyrotaxanes are capped by a bulky molecule, α ...

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Solvent‐free synthesis of pseudopolyrotaxane ... - Wiley …

Solvent‐free synthesis of pseudopolyrotaxane ... - Wiley …

Mar 08, 2007 · Pseudopolyrotaxane was obtained through the grinding of a mixture of O‐trimethyl‐α‐cyclodextrin and polytetrahydrofuran in a mortar by solvent‐free synthesis, and it was fixed to stable polyrotaxane by a successive end‐capping reaction with a bulky isocyanate by solid‐state grinding in a mortar.Higher molecular weight polytetrahydrofurans (M n > 1000) …

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Formation of a Supramolecular Gel between α-Cyclodextrin …

Formation of a Supramolecular Gel between α-Cyclodextrin …

Sep 09, 2004 · More on Polypseudorotaxanes Formed between Poly(ethylene glycol) and α-Cyclodextrin. Langmuir 2013, 29 ... and Aggregation of Pseudopolyrotaxanes. The Journal of Physical Chemistry B 2008, 112 (4 ... Modulating Pluronics micellar rupture with cyclodextrins and drugs: effect of pH and temperature. Journal of Physics: Conference Series ...

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Inclusion Complexes of Chain Molecules with Cycloamyloses.

Inclusion Complexes of Chain Molecules with Cycloamyloses.

Jun 16, 1997 · This article is cited by 59 publications. Joan Puig-Rigall, Rafael Serra-Gómez, Nerea Guembe-Michel, Isabelle Grillo, Cécile A. Dreiss, Gustavo González-Gaitano. Threading Different Rings on X-Shaped Block Copolymers: Hybrid Pseudopolyrotaxanes of …

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Polymers | Free Full-Text | Influence of Cyclodextrins on ...

Polymers | Free Full-Text | Influence of Cyclodextrins on ...

Sep 26, 2019 · A series of pyrenyl-containing PDMAA copolymers were prepared by free radical copolymerization of dimethylacrylamide (DMAA) with pyrenebutanoyloxy ethyl methacrylate (PyBEMA). The structure of as-prepared copolymers was characterized by UV, FT-IR and 1H NMR spectroscopy. The effect of cyclodextrins (α-CD, β-CD and γ-CD) on the …

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Which Rotovap Is Better - tageskind24.de

Which Rotovap Is Better - tageskind24.de

2. Prepare the rotovap. Using the handle, raise up the core part of the rotovap assembly. If the solvent trap is more than half-full, detach it and empty it into the organic waste. Check that the rotovap’s bump trap and adapter are clean. If the sample will become a free-flowing powder after the solvent is removed (for instance, if you are

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Freeze Dryer Eyela - diakonie-annaberg.de

Freeze Dryer Eyela - diakonie-annaberg.de

effect of rotovapor in pseudopolyrotaxanes formed with cyclodextrins and organic solvent ; freeze dryer from costco ; freeze dryer in spain ; how crystallization reactor lift work ; norko 17 litre chill fridge mini cooler in silver

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Molecular Distillation Gizmo - diakonie-annaberg.de

Molecular Distillation Gizmo - diakonie-annaberg.de

effect of rotovapor in pseudopolyrotaxanes formed with cyclodextrins and organic solvent ; electric muffle furnace price ; freeze dryer bench ; glass 3 compartment serving dish ; how closed loop extractor lowes ; how stem and leaf separator zoning ; how supercritical co2 extraction equipment upgrade ; industrial chiller maintenance maintenance ...

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Controllable DNA condensation through cucurbit[6]uril …

Controllable DNA condensation through cucurbit[6]uril …

2D pseudopolyrotaxanes containing b-cyclodextrins and cucur-bit[6]urils can induce DNA condensation, and the number of cucurbit[6]urils threaded onto the side chains of b-cyclodextrins plays important roles in this process. Gene therapy can be defined as the treatment of human disease by

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Supramolecular Hydrogels Based on MPEG-Grafted …

Supramolecular Hydrogels Based on MPEG-Grafted …

Simvastatin (SIM) accelerates new bone formation both in vitro and In Vivo by enhancing the expression of recombinant human bone morphogenetic protein-2 (rhBMP-2). In this study, we evaluated the effect of water-solubility of SIM on new bone formation by preparing two types of supramolecular hydroge …

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Polyol-responsive pseudopolyrotaxanes based on phenylboronic …

Polyol-responsive pseudopolyrotaxanes based on phenylboronic …

Feb 17, 2017 · Phenylboronic acid (PBA), which reacts with polyols to form cyclic esters, was attached to the amino terminal of polyethylene glycol (PEG) via amide bonds. PBA-PEG was used to prepare pseudopolyrotaxanes (pPRXs) by combining it with cyclodextrins (CyDs). In the case of α-CyD, a single stranded pPRX formed that disintegrated in the presence of catechol …

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Reversible 2D Pseudopolyrotaxanes Based On Cyclodextrins and …

Reversible 2D Pseudopolyrotaxanes Based On Cyclodextrins and …

Dec 06, 2006 · In this paper, a pseudorotaxane (2) was synthesized by reaction of cucurbit [6]uril with 6-[(6-aminohexyl)amino]-6-deoxy-β-cyclodextrin chloride. Subsequently, pseudorotaxanes 2 were further assembled to form a 2D pseudopolyrotaxane (3) through an α,ω-PPG2000 diamino polymer threading the cavities of cyclodextrins in 2, and the resulting pseudopolyrotaxane …

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Solvent-Free Formation of Cyclodextrin-Based Pseudopolyrotaxanes …

Solvent-Free Formation of Cyclodextrin-Based Pseudopolyrotaxanes …

Dec 08, 2021 · Pseudopolyrotaxanes (PPRs) are supramolecular structures consisting of macrocycles able to thread on a linear polymer chain in a reversible, non-covalent way, often referred to in the literature as “molecular necklaces”. While the synthesis and reaction mechanisms of these structures in solution have been widely described, their solvent-free …

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Formation and characterization of pseudo-polyrotaxanes …

Formation and characterization of pseudo-polyrotaxanes …

May 20, 2016 · Novel pseudo-polyrotaxanes (PPRs) consisting of poly(p-dioxanone) (PPDO) and cyclodextrins (CDs) were obtained via heat-cool (H-C) cycles.The optimum preparation condition for achieving the highest yield was investigated, which was selected as follow: 3 times H-C cycles in 72 h of PPDO and CDs dissolved in DMF at 60 °C.The PPRs were further …

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On the formation of inclusion complexes at the solid/liquid …

On the formation of inclusion complexes at the solid/liquid …

Mar 22, 2017 · Polyrotaxanes (or inclusion complexes) are supramolecular assemblies formed by threading a polymer chain through several ring-shaped molecules like cyclodextrin (CD) . Pseudopolyrotaxane is a type of inclusion complex that lacks stoppers at the end of the polymer chains. Cyclodextrins are cyclic oligosaccharides formed by glucopyranose units ...

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Crystallinity of block copolymer controlled by cyclodextrin

Crystallinity of block copolymer controlled by cyclodextrin

Jan 19, 2018 · We report a differential scanning calorimetry study to investigate the effect of cyclodextrins (CD) on the crystallinity of a copolymer. Tetronics was selected as copolymer with star-like shape formed by four polyethylene oxide flanked by four polypropylene oxide blocks linked to ethylenediamine central group. The use of CD with different cavity size was exploited …

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Chapter 1 Introduction (RSC Publishing) …

Chapter 1 Introduction (RSC Publishing) …

The low yield of polyrotaxane synthesis was improved dramatically by the introduction of host–guest chemistry after the 1970s. A wide variety of cyclic molecules, such as cyclodextrins (cyclic oligosaccharides of d-glucose), 5 crown ethers 6 and cucurbiturils, 7 were found to form the inclusion complex formation with guest molecules. They ...

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IJMS | Special Issue : Recent Insights in Chemistry and ... - MDPI

IJMS | Special Issue : Recent Insights in Chemistry and ... - MDPI

Dear Colleagues, At present, Cyclodextrin Chemistry and Technology has involved numerous scientists in various academic and industrial teams. In this field, pure research and industrial applications mostly converge in the unique aim of improving health and quality of life, increasing the feasibility of green technologies to prepare novel molecules, complexes and innovative …

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Structure and Thermodynamics of α-, β-, and γ-Cyclodextrin …

Structure and Thermodynamics of α-, β-, and γ-Cyclodextrin …

Nov 05, 2002 · The α-, β-, and γ-cyclodextrin (CyDs) dimers were studied by molecular dynamics (MD) simulations in water as an explicit solvent. The relative stability of dimers and the involved molecular interactions were determined. Three possible starting orientations were considered for the dimers: head-to-head, head-to-tail, and tail-to-tail. MD simulations were performed over a …

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Size-complementary effects of PEG diamine 1,1

Size-complementary effects of PEG diamine 1,1

Oct 09, 2021 · Abstract Poly(ethylene glycol) diamine 1,1’-disubstituted ferrocene was utilized as a size-com-plementary site to synthesize lower coverage pseudopolyrotaxanes (pPRs) from self-assemblies with β- and γ-cyclodextrins (CDs). After end-capping β-CD pPRs using N-(triphenylmethyl)glycine (Trt-Gly-OH), an exact β-CD [3]polyrotaxane (PR) was created. …

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Threaded macromolecules as a versatile framework …

Threaded macromolecules as a versatile framework …

that can form a PRX have been discovered. Among these combination, PRXs composed of cyclodextrins (CDs) and a linear polymer have attracted much attention and have been investigated ... complexes or pseudopolyrotaxanes. The pseudopolyrotaxanes are assembled onto each other via an ... decrease is presumably due to the chain entanglement effect ...

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VOLUME 32. No 5. - Cyclolab

VOLUME 32. No 5. - Cyclolab

middle (Tetronics) form pseudopolyrotaxanes with native CDs and CD derivatives (Puig-Regall et al., P64) (Fig. 3). The resulting gels can be useful for controlled-release drug (protein) ... entitled „Effects of CDs in living cells”, highlighting the following sub-topics: ... Most of these works were related to folate-modified cyclodextrins ...

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Pseudopolyrotaxanes based polyhedral oligomeric

Pseudopolyrotaxanes based polyhedral oligomeric

Sep 30, 2013 · Pseudopolyrotaxanes (POSS/CB(7)) were synthesized using octaimidazolium-based polyhedral oligomeric silsesquioxanes (POSS) and cucurbit(7)uril (CB(7)) in aqueous solution. The binding interactions were monitored by 1 H NMR. Their regular octahedral morphologies were confirmed by TEM. The POSS/CB(7) was also characterized by FT-IR, …

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Cécile Dreiss - Academia.edu

Cécile Dreiss - Academia.edu

Selective tuning of the self-assembly and gelation of a hydrophilic poloxamine by cyclodextrinsmore. by Cécile Dreiss. Inclusion complexes between cyclodextrins (CDs) and polymers - so-called pseudopolyrotaxanes (PPR) - are at the origin of fascinating supramolecular structures, which are finding increasing uses in biomedical and technological ...

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Effect of cyclodextrins on pH-induced conformational

Effect of cyclodextrins on pH-induced conformational

Dec 01, 2011 · Cyclodextrins (CDs), of which CD is the largest readily available member, are cyclic oligosaccharides, well-known for their ability to form inclusion complexes with various compounds (Connors, 1997) including polymers (Harada et al., 2009). Interactions of CDs with polymers can take several forms.

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Imprinted polymers with cyclodextrin pseudo

Imprinted polymers with cyclodextrin pseudo

Feb 15, 2013 · Highlights Cyclodextrin pseudo-polyrotaxanes (CD-PPRs) are used for protein recognition. CD-PPRs are formed by γ-cyclodextrins with polymer chains which length controlled. The specificity relies on the spatial configuration between CD-PPR and metal ions. The specific adsorption proteins were collected with a 0.500 mol L −1 KCl solution.

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Selective tuning of the self-assembly and gelation of a …

Selective tuning of the self-assembly and gelation of a …

May 26, 2015 · Complexes formed between cyclodextrins (CDs) and polymers - pseudopolyrotaxanes (PPRs) - are the starting point of a multitude of supramolecular structures, which are proposed for a wide range of biomedical and technological applications. ... and the effect correlates with the ability of the CDs to disrupt the micelles, with the exception of a ...

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Side-chain pseudopolyrotaxanes by threading cucurbituril[6…

Side-chain pseudopolyrotaxanes by threading cucurbituril[6…

Jul 12, 2006 · A novel side-chain pseudopolyrotaxanes 4 is synthesized from cucurbituril (CB[6]) and quaternized poly-4-vinylpyridine derivative 3 in water by simple stirring at room temperature. CB[6] beads are localized on hexamethylene units in side chains of 3 as found by NMR studies, and the hydrophobic and charge-dipole interactions are the driving force. The degree of …

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Cyclodextrin-functionalized Polymers as Drug Carriers …

Cyclodextrin-functionalized Polymers as Drug Carriers …

Cyclodextrins (CDs) represent the most extensively investigated cyclic molecules due ... 2.1.1 Polyrotaxanes formed by non-covalent link CD-based polyrotaxanes or pseudopolyrotaxanes (CDPRs), also termed as “molecular necklaces”, are a family of supramolecular polymers with CDs threading onto the ...

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Supramolecular Polymers Based on Cyclodextrins for Drug …

Supramolecular Polymers Based on Cyclodextrins for Drug …

Sep 14, 2010 · 2.3 Supramolecular Physical Hydrogels Formed by Cyclodextrins with Other Copolymers. Based on the similar mechanism that α-CD could thread on part of PEO segments in a block or homo polymer to form a supramolecular physical crosslinked structure, an increasing number of polypseudorotaxane-based physical hydrogels are appearing in the literature.

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Formation and self-association of host-guest complexes …

Formation and self-association of host-guest complexes …

Sep 15, 2021 · The authors investigated the effect of anions from the Hoffmeister series on the formation of pseudopolyrotaxanes between βCD and poly (propylene glycol)-bis-2-aminopropyl ether, founding that the formation and aggregation of the host–guest compounds depend on the anion nature, being more favorable in the order I O 3-> S C N-≈ I-≈ N O 3 ...

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Effect of cyclodextrins on pH-induced conformational

Effect of cyclodextrins on pH-induced conformational

Dec 01, 2011 · Cyclodextrins (CDs), of which CD is the largest readily available member, are cyclic oligosaccharides, well-known for their ability to form inclusion complexes with various compounds (Connors, 1997) including polymers (Harada et al., 2009). Interactions of CDs with polymers can take several forms.

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Polymers | Free Full-Text | Supramolecular Nanostructures …

Polymers | Free Full-Text | Supramolecular Nanostructures …

Mar 01, 2016 · Cyclodextrins (CDs) have been extensively studied as drug delivery carriers through host–guest interactions. ... the drug would form complexes with β-CD at the expense of the formation of pseudopolyrotaxanes between β-CD and the PPO segment. This research described the changes in the micellar structures occurring upon encapsulation of a ...

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Inclusion complexes synthesized from an ABA triblock …

Inclusion complexes synthesized from an ABA triblock …

Abstract. A triblock PEG-based polymer (CP1113) with a clear ABA structure was synthesized from 1,13-tridecanedioic acid (DA13) and mono-methoxy-poly(ethylene glycol) (MePEG) via condensation reaction. An inclusion complex (IC1113) with β-cyclodextrin (CD) was prepared by co-precipitation and the IC formation was confirmed by transmittance determination with a UV …

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CD-based Drug and Gene Delivery Systems on the …

CD-based Drug and Gene Delivery Systems on the …

Electrospinning of triclosan-loaded polyelectrolyte complex formed between chitosan and HPBCD crosslinked with citric acid resulted in membranes of improved antimicrobial effect for a prolonged period (Ouerghemmi et al., OP-21). Some further examples: Chitosan/CD polymer sponges (hydrogels) were impregnated with ciprofloxacin to

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Chaperone-like α-cyclodextrins assisted self

Chaperone-like α-cyclodextrins assisted self

Jan 28, 2009 · Chaperones are defined as a family of protein that mediates the correct assembly of other polypeptides but that are not components of the functional a…

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