keyword
MENU ▼
Read by QxMD icon Read
search

Supramolecular

keyword
https://www.readbyqxmd.com/read/28343134/exfoliated-graphene-nanosheets-ph-sensitive-drug-carrier-and-anti-cancer-activity
#1
Nisha Tyagi, Nour F Attia, Kurt E Geckeler
A straightforward and facile method for the exfoliation of graphene sheets using poly(vinylpyrrolidone) nanoparticles of an average size of 42nm was developed and their dual role as pH-sensitive drug carrier and anti-cancer agent was evaluated. The cytotoxic impact of the exfoliated nanosheets (GRP-PVP-NP) was examined on various cells (HCT-116, HeLa, SCC-9, NIH-3T3 and HEK-293cells) by a series of assays. Their cytotoxic nature was attributed to affecting the mitochondrial enzyme activity, proliferation capability, and the formation of tight junctions in cancer cells...
March 16, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28339123/desolution-of-cd-and-cb-macrocycles
#2
Jade A McCune, Susanna Kunz, Magdalena Olesińska, Oren A Scherman
Supramolecular chemistry utilizing the macrocyclic hosts cyclodextrins (CDs) and cucurbit[n]urils (CB[n]s) is traditionally carried out in aqueous media, however, their solubility is typically poor, especially the family of cucurbit[n]urils. Through derivitization of these macrocycles their solubility can be augmented to enable enhanced solubility in water and in some organic solvents. The increase in solubility of these derivitized macrocycles allows for their use in a wider range of chemical environments and giving rise to myriad potential applications...
March 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28338130/the-aqueous-supramolecular-chemistry-of-cucurbit-n-urils-pillar-n-arenes-and-deep-cavity-cavitands
#3
REVIEW
James Murray, Kimoon Kim, Tomoki Ogoshi, Wei Yao, Bruce C Gibb
This tutorial review summarizes the continuing exploration of three prominent water-soluble hosts: cucurbiturils, pillar[n]arenes and deep-cavity cavitands. As we describe, these hosts are revealing how orchestrating the hydrophobic effect can lead to a broad range of properties and applications, from: nano-reactors, supramolecular polymers, stimuli-responsive biointerfaces, switches, and novel purification devices. We also describe how their study is also revealing more details about the properties of water and aqueous solutions...
March 24, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28337859/self-healable-suparmolecular-hydrogel-formed-by-nor-seco-cucurbit-10-uril-as-a-supramolecular-crosslinker
#4
Kyeng Min Park, Joon Ho Roh, Gihyun Sung, James Murray, Kimoon Kim
A supramolecular hydrogel was formed by a simple mixing of solutions of nor-seco-cucurbit[10]uril (NS-CB[10]) and adamantylamine terminated-4 armed polyethyleneglyol (AdA-4-arm-PEG). In the formation of the hydrogel, NS-CB[10] acted as a noncovalent crosslinker to form a ternary complex with two AdA moieties. The dynamic and selective nature of the host-guest interaction between NS-CB[10] and AdA enabled the supramolecular hydrogel to rapidly recover its physical properties after it was damaged. In addition, the recovered hydrogel showed sustained physical properties with negligible differences from those of the pristine material, even after multiple self-healing cycles...
March 24, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28337670/supramolecular-systems-and-chemical-reactions-in-single-molecule-break-junctions
#5
REVIEW
Xiaohui Li, Duan Hu, Zhibing Tan, Jie Bai, Zongyuan Xiao, Yang Yang, Jia Shi, Wenjing Hong
The major challenges of molecular electronics are the understanding and manipulation of the electron transport through the single-molecule junction. With the single-molecule break junction techniques, including scanning tunneling microscope break junction technique and mechanically controllable break junction technique, the charge transport through various single-molecule and supramolecular junctions has been studied during the dynamic fabrication and continuous characterization of molecular junctions. This review starts from the charge transport characterization of supramolecular junctions through a variety of noncovalent interactions, such as hydrogen bond, π-π interaction, and electrostatic force...
April 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28335592/air-and-light-stable-p4-and-as4-within-an-anion-coordination-based-tetrahedral-cage
#6
Dong Yang, Jie Zhao, Le Yu, Xiangsong Lin, Wenyao Zhang, Hongwei Ma, Adolf Gogoll, Zhibin Zhang, Yao-Yu Wang, Xiao-Juan Yang, Biao Wu
In contrast to the stable dinitrogen molecule, white phosphorus (P4) and yellow arsenic (As4) are very reactive allotropic modifications of these two heavier pnicogen elements, which has greatly hampered the study of their properties and applications. Thus the safe storage and transport of them is imperative. Supramolecular caged structures are one of the most efficient approaches for the encapsulation and stabilization of reactive species; however, their use in the P4 and As4 chemistry is very rare. In the current work, we demonstrate a new design strategy for constructing finite cages and including guests based on anion coordination chemistry...
March 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28335253/soft-interaction-in-liposome-nanocarriers-for-therapeutic-drug-delivery
#7
REVIEW
Domenico Lombardo, Pietro Calandra, Davide Barreca, Salvatore Magazù, Mikhail A Kiselev
The development of smart nanocarriers for the delivery of therapeutic drugs has experienced considerable expansion in recent decades, with the development of new medicines devoted to cancer treatment. In this respect a wide range of strategies can be developed by employing liposome nanocarriers with desired physico-chemical properties that, by exploiting a combination of a number of suitable soft interactions, can facilitate the transit through the biological barriers from the point of administration up to the site of drug action...
June 25, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334479/signal-induced-release-of-guests-from-a-photolatent-metal-phenolic-supramolecular-cage-and-its-hybrid-assemblies
#8
Chiyoung Park, Beom Joo Yang, Ki Beom Jeong, Chae Bin Kim, Seunghyun Lee, Bon-Cheol Ku
The coordination chemistry of plant polyphenols and metal ions can be used for coating various substrates and for creating modular superstructures. We herein explored this chemistry for the controlled release of guests from mesoporous silica nanoparticles (MSNs). The selective adsorption of tannic acids (TAs) on MSN silica walls opens the MSN mesoporous channels without disturbing mass transport. The channel may be closed by the coordination of TA with Cu(II) ions. Upon exposure to light, photolysis of Trojan horse guests (photoacid generators, PAGs) leads to acid generation, which enables the release of payloads by decomposing the outer coordination shell consisting of TA and Cu(II) ...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28333452/mixed-lanthanide-porous-coordination-polymers-showing-range-tunable-ratiometric-luminescence-for-o2-sensing
#9
Jia-Wen Ye, Jiao-Min Lin, Zong-Wen Mo, Chun-Ting He, Hao-Long Zhou, Jie-Peng Zhang, Xiao-Ming Chen
Luminescent porous coordination polymers (PCPs) are emerging as attractive oxygen-sensing materials, but they are mostly based on single-wavelength luminometry. Here, we report a special mixed-lanthanide strategy for self-referenced ratiometric oxygen sensing. A series of isostructural, pure-lanthanide, or mixed-lanthanide PCPs, MCF-53(Tb/Eux), were synthesized by solvothermal reactions. Single-crystal X-ray diffraction revealed that MCF-53(Tb/Eux) is composed of complicated two-dimensional coordination networks, which interdigitate to form a three-dimensional supramolecular structure retaining one-dimensional ultra-micropores...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28332834/multicomponent-platinum-ii-cages-with-tunable-emission-and-amino-acid-sensing
#10
Mingming Zhang, Manik Lal Saha, Ming Wang, Zhixuan Zhou, Bo Song, Chenjie Lu, Xuzhou Yan, Xiaopeng Li, Feihe Huang, Shouchun Yin, Peter J Stang
The syntheses, characterization and the emission properties of three tetragonal prismatic cages 4a-4c constructed from eight 90o Pt(II) acceptors, four linear dipyridyl ligands and two tetraphenylethene (TPE) based sodium benzoate ligands are described. These cages are emissive in dilute solutions due to the metal-coordination induced partial restriction of intramolecular rotation of their TPE units, while the dipyridyl moieties which act as the pillars as well as the solvents strongly influence these emissions...
March 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28331187/cross-beta-nanostructures-based-on-dinaphthylalanine-gd-conjugates-loaded-with-doxorubicin
#11
Carlo Diaferia, Eliana Gianolio, Teresa Sibillano, Flavia Anna Mercurio, Marilisa Leone, Cinzia Giannini, Nicole Balasco, Luigi Vitagliano, Giancarlo Morelli, Antonella Accardo
Very recently we proposed novel di- and tetra-phenylalanine peptides derivatized with gadolinium complexes as potentials supramolecular diagnostic agents for applications in MRI (Magnetic Resonance Imaging). It was observed that in very short FF dipeptide building blocks, the propensity to aggregate decreases significantly after modification with bulky moiety such as Gd-complexes, thus limiting their potential as CAs. We hypothesized that the replacement of the Phe side chain with more extended aromatic groups could improve the self-assembling...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28329693/lanthanide-integrated-supramolecular-polymeric-nanoassembly-with-multiple-regulation-characteristics-for-multidrug-resistant-cancer-therapy
#12
Weihong Jin, Qiwen Wang, Min Wu, Yang Li, Guping Tang, Yuan Ping, Paul K Chu
Cancer treatment can in principle be enhanced by the synergistic effects of chemo- and nucleic acid-based combination therapies but the lack of efficient drug nanocarriers and occurrence of multidrug resistance (MDR) are major obstacles adversely affecting the effectiveness. Herein, a lanthanide-integrated supramolecular polymeric nanoassembly that delivers anticancer drugs and siRNA for more effective cancer therapy is described. This nanotherapeutic system is prepared by loading adamantane-modified doxorubicin (Dox) into polyethylenimine-crosslinked-γ-cyclodextrin (PC) through the supramolecular assembly to form the interior Dox-loaded PC (PCD) followed by electrostatically driven self-assembly of siRNA and PCD to produce the PCD/siRNA nanocomplexes...
March 16, 2017: Biomaterials
https://www.readbyqxmd.com/read/28329017/navigating-in-foldonia-using-accelerated-molecular-dynamics-to-explore-stability-unfolding-and-self-healing-of-the-%C3%AE-solenoid-structure-formed-by-a-silk-like-polypeptide
#13
Binwu Zhao, Martien A Cohen Stuart, Carol K Hall
The β roll molecules with sequence (GAGAGAGQ)10 stack via hydrogen bonding to form fibrils which have been themselves been used to make viral capsids of DNA strands, supramolecular nanotapes and pH-responsive gels. Accelerated molecular dynamics (aMD) simulations are used to investigate the unfolding of a stack of two β roll molecules, (GAGAGAGQ)10, to shed light on the folding mechanism by which silk-inspired polypeptides form fibrils and to identify the dominant forces that keep the silk-inspired polypeptide in a β roll configuration...
March 22, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28328228/reversible-morphological-control-of-cholecystokinin-tetrapeptide-amyloid-assemblies-as-a-function-of-ph
#14
Frédéric Gobeaux, Florence Porcher, Rajeev Dattani
Most amyloid assemblies are seen as irreversible and exhibit polymorphism because their assembly is kinetically controlled and different structures are trapped during the aggregation process. However, in the specific case of peptide hormones, formation of amyloid assemblies for storage purposes has been reported. This suggests a strict control of assembly and the ability to disassemble upon hormone secretion. In the present work, we have sought to test these assertions with a short peptide, the cholecystokinin (or gastrin) tetrapeptide (CCK-4), that has been found in both gastrointestinal tract and central nervous system, and whose sequence is shared by a large number of hormones...
March 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28328176/glucose-responsive-supramolecular-vesicles-based-on-water-soluble-pillar-5-arene-and-pyridylboronic-acid-derivative-for-controlled-insulin-delivery
#15
Lei Gao, Tingting Wang, Keke Jia, Xuan Wu, Chenhao Yao, Wei Shao, Dongmei Zhang, Xiao-Yu Hu, Leyong Wang
The stimuli-responsive behavior of supramolecular nanocarriers is crucial for their potential applications as smart drug delivery systems. We hereby constructed a glucose-responsive supramolecular drug delivery system constructed by the host-guest interaction between a water-soluble pillar[5]arene (WP5) and a pyridylboronic acid derivative (G) for insulin delivery and controlled release at physiological condition, which represents the ideal treatment of diabetes mellitus. The drug loading and in vitro drug release experiments demonstrated that large molecular weight insulin could be successfully encapsulated into the vesicles with high loading efficiency, which to the best of our knowledge, is the first example of small size supramolecular vesicles with excellent encapsulation capacity of large protein molecule...
March 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28326666/from-millimeter-to-subnanometer-vapor-solid-deposition-of-carbon-nitride-hierarchical-nanostructures-directed-by-supramolecular-assembly
#16
Jingsan Xu, Hong Wang, Chao Zhang, Xiaofei Yang, Shaowen Cao, Jiaguo Yu, Menny Shalom
Shape and nanostructure control has great potential to enable graphitic carbon nitride (C3 N4 ) structures with new properties and functionalities. In this work, a new type of hierarchically structured nanoporous C3 N4 is introduced. The C3 N4 exhibits unique, edelweiss-like morphology, with components ranging from millimeter-sized bunches to subnanometer-thick layers. A one-step vapor-solid deposition approach using supramolecular aggregates as the precursor is carried out to accomplish the growth. Supramolecular pre-association plays a crucial role in achieving this nanostructure by directing the vaporization and deposition processes...
March 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28325936/in-situ-gisaxs-study-of-supramolecular-nanofibers-having-ultrafast-humidity-sensitivity
#17
Arpan Bhattacharyya, Milan K Sanyal, Umesha Mogera, Subi J George, Mrinmay K Mukhopadhyay, Santanu Maiti, Giridhar U Kulkarni
Self assembled nanofibers derived from donor-acceptor (D-A) pair of dodecyl methyl viologen (DMV) and potassium salt of coronene tetracarboxylate (CS) is an excellent material for the development of organic electronic devices particularly for ultrafast response to relative humidity (RH). Here we have presented the results of in-situ grazing incidence small angle x-ray scattering (GISAXS) measurements to understand aridity dependent self reorganization of the nanofibers. The instantaneous changes in the organization of the nanofibers was monitored with different equilibrium RH conditions...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28325339/toward-novel-antiparasitic-formulations-complexes-of-albendazole-desmotropes-and-%C3%AE-cyclodextrin
#18
Ana K Chattah, Laura Y Pfund, Ariana Zoppi, Marcela R Longhi, Claudia Garnero
Novel complexes of two different solid forms of Albendazol and β-cyclodextrin were investigated in an attempt to obtain promising candidates for the preparation of alternative matrices used in pharmaceutical oral formulations. The interaction between each form of Albendazol and β-cyclodextrin was studied in solution and solid state, in order to investigate their effect on the solubility and dissolution rate of Albendazol solid forms. The solid supramolecular systems were characterized using a variety of techniques including natural-abundance (13)C cross-polarization magic-angle-spinning nuclear magnetic resonance, powder X-ray diffraction, Fourier transform-infrared spectroscopy and scanning electron microscopy...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28325312/structural-and-enzyme-kinetic-studies-of-retrograded-starch-inhibition-of-%C3%AE-amylase-and-consequences-for-intestinal-digestion-of-starch
#19
Hamung Patel, Paul G Royall, Simon Gaisford, Gareth R Williams, Cathrina H Edwards, Frederick J Warren, Bernadine M Flanagan, Peter R Ellis, Peter J Butterworth
Retrograded starch is known to be resistant to digestion. We used enzyme kinetic experiments to examine how retrogradation of starch affects amylolysis catalysed by porcine pancreatic amylase. Parallel studies employing differential scanning calorimetry, infra red spectroscopy, X-ray diffraction and NMR spectroscopy were performed to monitor changes in supramolecular structure of gelatinised starch as it becomes retrograded. The total digestible starch and the catalytic efficiency of amylase were both decreased with increasing evidence of retrogradation...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28324621/quantum-chemical-dissection-of-the-shortest-p-o%C3%A2-%C3%A2-%C3%A2-i-halogen-bond-the-decisive-role-of-crystal-packing-effects
#20
Milan Kivala, Tobias A Schaub, Rebecca Sure, Frank Hampel, Stefan Grimme
We report on a supramolecular arrangement comprising a bridged triarylphoshine oxide and an aryl iodide that features the shortest ever reported P=O···I halogen bond of 2.683(5) Å in the solid state. X-ray crystallographic analysis together with modern quantum chemical methods were enlisted to dissect the individual contributions that compelled this exceptionally short halogen bond pointing out the decisive role of crystal packing effects.
March 21, 2017: Chemistry: a European Journal
keyword
keyword
89465
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"