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https://www.readbyqxmd.com/read/28821147/uv-crosslinkable-and-thermo-responsive-chitosan-hybrid-hydrogel-for-nir-triggered-localized-on-demand-drug-delivery
#1
Lei Wang, Baoqiang Li, Feng Xu, Zheheng Xu, Daqing Wei, Yujie Feng, Yaming Wang, Dechang Jia, Yu Zhou
Innovative drug delivery technologies based on smart hydrogels for localized on-demand drug delivery had aroused great interest. To acquire smart UV-crosslinkable chitosan hydrogel for NIR-triggered localized on-demanded drug release, a novel UV-crosslinkable and thermo-responsive chitosan was first designed and synthesized by grafting with poly N-isopropylacrylamide, acetylation of methacryloyl groups and embedding with photothermal carbon. The UV-crosslinkable unit (methacryloyl groups) endowed chitosan with gelation via UV irradiation...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821116/active-release-coating-of-multilayer-assembled-branched-and-ionic-%C3%AE-cyclodextrins-onto-poly-ethylene-terephthalate
#2
Leyre Pérez-Álvarez, Leire Ruiz-Rubio, Erlantz Lizundia, Estíbaliz Hernáez, Luis M León, Jose Luis Vilas-Vilela
Branched ionic cyclodextrins multilayers were assembled onto the surface of previously aminolyzed poly(ethylene terephthalate) in order to construct local drug delivery tailored platforms with potential applicability as materials for indwelling medical devices. The construction of the multilayers took place by the alternate deposition of ionic cyclodextrin derivatives and was characterized by surface zeta-potential measurements, X-ray photoelectron spectroscopy and, after fluorescent labeling of anionic branched cyclodextrins, by UV-vis spectroscopy and confocal fluorescence spectroscopy...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821114/preparation-and-characterization-of-a-composite-biomaterial-including-starch-micro-nano-particles-loaded-chitosan-gel
#3
Dorsa Dehghan Baniani, Reza Bagheri, Atefeh Solouk
Thermosensitive Chitosan hydrogels which can be injected into defects with minimally invasive approach were prepared. Also starch micro/nano particles were synthesized via water-in-oil (W/O) miniemulsion technique. The starch particles were incorporated into the chitosan hydrogel to prepare injectable thermosensitive hydrogel composites. Tube inverting method, compression tests, swelling studies, XRD, SEM, OM, DLS, UV-vis spectroscopy were used for investigations. Results revealed that increasing crosslinker and surfactant contents and stirring rate leads to particle size reduction...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821110/unraveling-the-reaction-mechanism-of-silver-ions-reduction-by-chitosan-from-so-far-neglected-spectroscopic-features
#4
Ana Patrícia Carapeto, Ana Maria Ferraria, Ana Maria Botelho do Rego
Metallic silver nanoparticles were synthesized in aqueous solution using chitosan, as both reducing and stabilizing agent, and AgNO3 as silver precursor aiming the production of solid ultra-thin films. A systematic characterization of the resulting system as a function of the initial concentrations was performed. The combination of UV-vis absorption - and its quantitative analysis - with X-ray photoelectron spectra, light scattering measurements and atomic force microscopy allowed obtaining a rational picture of silver reduction mechanism through the identification of the nature of the formed reduced/oxidized species...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821064/gum-tragacanth-stabilized-green-gold-nanoparticles-as-cargos-for-naringin-loading-a-morphological-investigation-through-afm
#5
Komal Rao, Muhammad Imran, Tooba Jabri, Imdad Ali, Samina Perveen, Shafiullah, Shakil Ahmed, Muhammad Raza Shah
Gold nanoparticles (AuNPs) have attracted greater scientific interests for the construction of drugs loading cargos due to their biocompatibility, safety and facile surface modifications. This study deals with the fabrication of gum tragacanth (GT) green AuNPs as carrier for Naringin, a less water soluble therapeutic molecule. The optimized AuNPs were characterized through UV-vis spectroscopy, FT-IR and atomic force microscope (AFM). Naringin loaded nanoparticles were investigated for their bactericidal potentials using Tetrazolium Microplate assay...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821030/preparation-and-characterization-of-a-photocatalytic-antibacterial-material-graphene-oxide-tio2-bacterial-cellulose-nanocomposite
#6
Ling-Pu Liu, Xiao-Ning Yang, Li Ye, Dong-Dong Xue, Miao Liu, Shi-Ru Jia, Ying Hou, Li-Qiang Chu, Cheng Zhong
In this study, bacterial cellulose (BC) was used as a matrix to synthesize graphene oxide/Titanium dioxide (GOTiO2)-based hybrid materials. It was indicated by X-ray diffraction and selected area electron diffraction that the crystal structure of GOTiO2 was a mixed phase containing anatase and rutile. TiO2 nanoparticles were of 10-30nm diameters and densely anchored on graphene oxide sheets. Superior photocatalytic performance of the GOTiO2 was achieved under near UV excitation. The photocatalytic efficiency was optimized through controlling an appropriate calcined temperature...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820991/robust-evaluation-of-performance-monitoring-options-for-ozone-disinfection-in-water-recycling-using-bayesian-analysis
#7
Guido Carvajal, Amos Branch, Philipp Michel, Scott A Sisson, David J Roser, Jörg E Drewes, Stuart J Khan
Ozonation of wastewater has gained popularity because of its effectiveness in removing colour, UV absorbance, trace organic chemicals, and pathogens. Due to the rapid reaction of ozone with organic compounds, dissolved ozone is often not measurable and therefore, the common disinfection controlling parameter, concentration integrated over contact time (CT) cannot be obtained. In such cases, alternative parameters have been shown to be useful as surrogate measures for microbial removal including change in UV254 absorbance (ΔUVA), change in total fluorescence (ΔTF), or O3:TOC (or O3:DOC)...
August 1, 2017: Water Research
https://www.readbyqxmd.com/read/28820990/relative-importance-of-humic-and-fulvic-acid-on-ros-generation-dissolution-and-toxicity-of-sulfide-nanoparticles
#8
Enxiang Shang, Yang Li, Junfeng Niu, Yijing Zhou, Tianyu Wang, John Charles Crittenden
In this study, the effect of natural organic matter (NOM) composition (humic acid (HA) or fulvic acid (FA)) on dissolution, reactive oxygen species (ROS) generation, and toxicity of sulfide nanoparticles (NPs) was investigated under UV irradiation. NOM acted as a UV filter or antioxidant, decreasing ROS (O2(-), OH, and (1)O2) generation by WS2 and MoS2 NPs. The higher light-absorbing fractions of HA in NP/HA mixtures and the faster reaction rate of HA with ROS resulted in higher inhibition effect of HA than FA on O2(-) and OH generation by WS2 and MoS2 NPs...
August 3, 2017: Water Research
https://www.readbyqxmd.com/read/28820940/polyoxometalate-cationic-cluster-and-%C3%AF-%C3%AE-cyclodextrin-from-primary-interactions-to-supramolecular-hybrid-materials
#9
Mhamad Aly Moussawi, Nathalie Leclerc-Laronze, Sébastien Floquet, Pavel A Abramov, Maxim Nailyevich Sokolov, Stephane Cordier, Anne Ponchel, Eric Monflier, Herve Bricout, David Landy, Mohamed Haouas, Jerome Marrot, Emmanuel Cadot
Herein, we report on a three-component supramolecular hybrid system built from specific recognition processes involving a Dawson type polyoxometalate [P2W18O62](6-,) a cationic electron-rich cluster {[Ta6Br12(H6O)6]@2CD}(2+) and γ-cyclodextrin. Investigations of such a class of materials have been conducted using bottom-up approach by studying the specific interactions between -CD and both types of inorganic units. Their ability to interact has been investigated in the solid state by single-crystal X-ray diffraction and in solution using multinuclear NMR methods (including DOSY, EXSY and COSY), ESI-mass and UV-vis spectroscopies, electrochemistry and ITC experiments...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820741/electromagnetic-and-optical-characteristics-of-nb5-doped-double-crossover-and-salmon-dna-thin-films
#10
Mitta Sekhar Babu, Sreekantha Reddy Dugasani, Soon-Gil Jung, Srivithya Vellampatti, Tuson Park, Sung Ha Park
We report the fabrication and physical characteristics of niobium ion (Nb5+)-doped double-crossover DNA (DX-DNA) and salmon DNA (SDNA) thin films. Different concentrations of Nb5+ ([Nb5+]) are coordinated into the DNA molecules, and the thin films are fabricated via substrate-assisted growth (DX-DNA) and drop-casting (SDNA) on oxygen plasma treated substrates. We conducted atomic force microscopy to estimate the optimum concentration of Nb5+ ([Nb5+]O = 0.08 mM) in Nb5+-doped DX-DNA thin films, up to which the DX-DNA lattices maintain their structures without deformation...
August 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28820739/metal-to-insulator-transition-induced-by-uv-illumination-in-a-single-sno-sub-2-sub-nanobelt
#11
Emilson Ribeiro Viana, Geraldo Mathias Ribeiro, Alfredo G de Oliveira, Juan Carlos Gonzalez Perez
An individual tin oxide (SnO<sub>2</sub>) nanobelt was connected in a back-gate field-effect transistor (FET) configuration and the conductivity of the nanobelt were measured at different temperatures from 400K to 4K, in darkness and under UV illumination. In darkness, the SnO<sub>2</sub> nanobelts show semiconductor behaviour for the whole temperature range measured. But when subject to UV illumination the photoinduced carriers was high enough that leads to a Metal-to-Insulator transition, near room temperature, at T<sub>MIT</sub> = 240 K...
August 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28820584/conjugated-backbone-effect-of-organic-small-molecules-for-n-type-thermoelectric-materials-with-zt-over-0-2
#12
Dazhen Huang, Huiying Yao, Yutao Cui, Ye Zou, Fengjiao Zhang, Chao Wang, Hongguang Shen, Wenlong Jin, Jia Zhu, Ying Diao, Wei Xu, Chong-An Di, Daoben Zhu
Conjugated backbones play a fundamental role in determining the electronic properties of organic semiconductors. Based on two solution-processable dropyrrolo[3,4-c]pyrrole-1,4-diylidene)bis(thieno[3,2-b]thiophene derivatives with aromatic and quinoid structures, we have carried out a systematic study of the relationship between the conjugated-backbone structure and the thermoelectric properties. In particular, a combination of UV-vis-NIR spectra, photoemission spectroscopy and doping optimization are utilized to probe the interplay between energy levels, chemical doping, and thermoelectric performance...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820224/label-free-fluorescent-immunoassay-for-cu-2-ion-detection-based-on-uv-degradation-of-immunocomplex-and-metal-ion-chelates
#13
Qi Shu, Mengli Liu, Hui Ouyang, Zhifeng Fu
A mouse anti Cu(2+)-EDTA monoclonal antibody was used to capture EDTA chelated Cu(2+) ions. Then UV radiation was utilized to degrade immunocomplex and Cu(2+)-EDTA chelates to release free Cu(2+) ions. Based on their quenching effect to the fluorescent emission of CdSe/ZnS quantum dots, the released Cu(2+) ions could be detected with ideal specificity and high sensitivity.
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820214/mediated-water-electrolysis-in-biphasic-systems
#14
Micheál D Scanlon, Pekka Peljo, Lucie Rivier, Heron Vrubel, Hubert H Girault
The concept of efficient electrolysis by linking photoelectrochemical biphasic H2 evolution and water oxidation processes in the cathodic and anodic compartments of an H-cell, respectively, is introduced. Overpotentials at the cathode and anode are minimised by incorporating light-driven elements into both biphasic reactions. The concepts viability is demonstrated by electrochemical H2 production from water splitting utilising a polarised water-organic interface in the cathodic compartment of a prototype H-cell...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28820199/tuning-the-copper-ii-coordination-properties-of-cyclam-by-subtle-chemical-modifications
#15
Nathalie Camus, Nathalie Le Bris, Selbi Nuryyeva, Matthieu Chessé, David Esteban-Gómez, Carlos Platas-Iglesias, Raphaël Tripier, Mourad Elhabiri
The acid-base and copper(ii) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical calculations were combined to investigate the protonation and binding properties of Bn-cyclam-EtOH (L1), oxo-cyclam-EtOH (L2) and oxo-Bn-cyclam-EtOH (L3). These three cyclams are C-functionalized by a hydroxyethyl pendant arm and display either one N-benzyl group and/or an amide replacing one macrocyclic secondary amine...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28820023/use-of-oxalic-acid-as-inducer-in-photocatalytic-oxidation-of-cresol-red-in-aqueous-solution-under-natural-and-artificial-light
#16
N Seraghni, I Ghoul, I Lemmize, A Reguig, N Debbache, T Sehili
This work was carried out in the field of water treatment using advanced oxidation processes (AOPs), especially photolysis of carboxylic acid leads to the formation in situ of hydroxyl radical ((.)OH). Cresol red (CR) degradation induced by organic acids/UV system was investigated in aqueous solution. The preliminary study of CR-organic acid mixture in the dark and at room temperature allowed confirming the absence of interaction under our experimental conditions. However, up on irradiation at 365 nm the percentage of elimination of CR was 89% after 5 hours of irradiation...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28819981/highly-efficient-guiding-of-motile-microtubules-on-non-topographical-motor-patterns
#17
Cordula Reuther, Matthäus Mittasch, Sundar Naganathan, Stephan Grill, Stefan Diez
Molecular motors, highly-efficient biological nano-machines, hold the potential to be employed for a wide range of nanotechnological applications. Towards this end, kinesin, dynein or myosin motor proteins are commonly surface-immobilized within engineered environments in order to transport cargo attached to cytoskeletal filaments. Being able to flexibly control the direction of filament motion - in particular on planar, non-topographical surfaces - has, however, remained challenging. Here, we demonstrate the applicability of a UV-laser-based ablation technique to programmably generate highly-localized patterns of functional kinesin-1 motors with different shapes and sizes on PLL-g-PEG-coated polystyrene surfaces...
August 18, 2017: Nano Letters
https://www.readbyqxmd.com/read/28819546/oxidative-stress-harms-and-benefits-for-human-health
#18
REVIEW
Gabriele Pizzino, Natasha Irrera, Mariapaola Cucinotta, Giovanni Pallio, Federica Mannino, Vincenzo Arcoraci, Francesco Squadrito, Domenica Altavilla, Alessandra Bitto
Oxidative stress is a phenomenon caused by an imbalance between production and accumulation of oxygen reactive species (ROS) in cells and tissues and the ability of a biological system to detoxify these reactive products. ROS can play, and in fact they do it, several physiological roles (i.e., cell signaling), and they are normally generated as by-products of oxygen metabolism; despite this, environmental stressors (i.e., UV, ionizing radiations, pollutants, and heavy metals) and xenobiotics (i.e., antiblastic drugs) contribute to greatly increase ROS production, therefore causing the imbalance that leads to cell and tissue damage (oxidative stress)...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28819295/tailoring-heterovalent-interface-formation-with-light
#19
Kwangwook Park, Kirstin Alberi
Integrating different semiconductor materials into an epitaxial device structure offers additional degrees of freedom to select for optimal material properties in each layer. However, interfaces between materials with different valences (i.e. III-V, II-VI and IV semiconductors) can be difficult to form with high quality. Using ZnSe/GaAs as a model system, we explore the use of ultraviolet (UV) illumination during heterovalent interface growth by molecular beam epitaxy as a way to modify the interface properties...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28819103/mass-production-of-polymer-nano-wires-filled-with-metal-nano-particles
#20
Nino Lomadze, Alexey Kopyshev, Matias Bargheer, Markus Wollgarten, Svetlana Santer
Despite the ongoing progress in nanotechnology and its applications, the development of strategies for connecting nano-scale systems to micro- or macroscale elements is hampered by the lack of structural components that have both, nano- and macroscale dimensions. The production of nano-scale wires with macroscale length is one of the most interesting challenges here. There are a lot of strategies to fabricate long nanoscopic stripes made of metals, polymers or ceramics but none is suitable for mass production of ordered and dense arrangements of wires at large numbers...
August 17, 2017: Scientific Reports
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