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https://www.readbyqxmd.com/read/28433942/synthesis-and-characterization-of-poly-propylene-imine-dendrimer-grafted-gold-nanoparticles-as-nanocarriers-of-doxorubicin
#1
Marzieh Golshan, Mehdi Salami-Kalajahi, Mina Mirshekarpour, Hossein Roghani-Mamaqani, Maryam Mohammadi
The aim of current work is synthesis 4th-generation-poly(propylene imine) (PPI)-dendrimer modified gold nanoparticles (Au-G4A) as nanocarriers for doxorubicin (DOX) and studying in vitro drug release kinetics from nanocarriers into different media. Accordingly, AuNPs were synthesized by reduction of chloroauric acid (HAuCl4) aqueous solution with trisodium citrate and modified with cysteamine to obtain amine-functionalized (Au-NH2) nanoparticles. Au-NH2 nanoparticles were used as multifunctional cores and participated in Michael addition of acrylonitrile and reduction process by lithium aluminum hydride (LAH) to synthesize Au-G4A nanoparticles...
April 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28433178/preparation-and-characterization-of-biodegradable-nanocomposites-derived-from-carboxymethyl-cellulose-and-hydroxyapatite
#2
K Azzaoui, E Mejdoubi, A Lamhamdi, S Jodeh, O Hamed, M Berrabah, S Jerdioui, R Salghi, N Akartasse, A Errich, Á Ríos, M Zougagh
Development of a cost-effective technology for extraction and quantification of carcinogenic and toxic organic materials which are widely used in the industry are critical to humans. Membrane technology received much attention and has already been widely used in this area. In this work, we offer a newly developed bio-based nanocomposite membrane for removal of bisphenol-A (BPA) from water. Three natural components hydroxyapatite (HAp), carboxymethyl cellulose and lysine as a diluent were used for making the bio-based membrane...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28433164/characterization-and-application-of-cellulose-acetate-synthesized-from-sugarcane-bagasse
#3
R G Candido, G G Godoy, Adilson R Gonçalves
The synthesis and application of cellulose acetate (CA) from sugarcane bagasse were investigated. Firstly, cellulose was extracted by a sequential treatment with H2SO4 (10% v/v), NaOH (5% w/v), EDTA (0.5% w/V), and H2O2 (5% v/v), and characterized by X-ray diffraction (DRX). After the acetylation of the extracted cellulose, CA was characterized using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetry analysis (TGA), and was applied in the membrane production...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28433160/thiolated-chitosan-micelles-highly-mucoadhesive-drug-carriers
#4
Arshad Mahmood, Melanie Lanthaler, Flavia Laffleur, Christian W Huck, Andreas Bernkop-Schnürch
Current study was aimed to generate thiolated chitosan micelles based on amphiphilic chitosan-stearic acid conjugate (CSA) and to evaluate adhesive properties on mucosal membranes. Chitosan-stearic acid-thioglycolic acid (CSA-TGA) conjugate was synthesized via stearic acid linkage to chitosan and later, thioglycolic acid was covalently attached to CSA. CSA-TGA and CSA were characterized by degree of amine substitution, thiol group determination, ATR-FTIR and cytotoxicity analysis. Micelle size was 13.40±9...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28433152/biodegradable-blends-of-urea-plasticized-thermoplastic-starch-utps-and-poly-%C3%AE%C2%B5-caprolactone-pcl-morphological-rheological-thermal-and-mechanical-properties
#5
Ana Carolina Correa, Vitor Brait Carmona, José Alexandre Simão, Luiz Henrique Capparelli Mattoso, José Manoel Marconcini
Biodegradable blends of urea plasticized thermoplastic starch (UTPS) and poly(ε-caprolactone) (PCL) were prepared in a co-rotating twin screw extruder. The UTPS and PCL content varied in a range of 25wt%. The materials were characterized by capillary rheometry, scanning electron microscopy (SEM), termogravimetry (TGA), differential scanning calorimetry (DSC) and tensile tests. Capillary rheometry showed better interaction between UTPS and PCL at 110°C than at 130°C. SEM showed immiscibility of all blends and good dispersion of UTPS in PCL matrix up to 50wt%...
July 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28429740/micelle-template-synthesis-of-hollow-silica-spheres-for-improving-water-vapor-permeability-of-waterborne-polyurethane-membrane
#6
Yan Bao, Tong Wang, Qiaoling Kang, Chunhua Shi, Jianzhong Ma
Hollow silica spheres (HSS) with special interior spaces, high specific surface area and excellent adsorption and permeability performance were synthesized via micelle-template method using cetyl trimethyl ammonium bromide (CTAB) micelles as soft template and tetraethoxysilane (TEOS) as silica precursor. SEM, TEM, FT-IR, XRD, DLS and BET-BJH were carried out to characterize the morphology and structure of as-obtained samples. The results demonstrated that the samples were amorphous with a hollow structure and huge specific surface area...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28427632/ultrasonic-treatment-of-cofe2o4-b2o3-sio2-as-a-new-hybrid-magnetic-composite-nanostructure-and-catalytic-application-in-the-synthesis-of-dihydroquinazolinones
#7
Ali Maleki, Morteza Aghaei, Hamid Reza Hafizi-Atabak, Mohammad Ferdowsi
New hybrid magnetic composite nanostructure are prepared via ultrasonic treatment by glass-ceramic method, characterized by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM), energy-dispersive X-ray (EDX), element distribution image (EDX mapping), thermal gravimetric analysis (TGA)/differential thermal analysis (DTA) and N2 adsorption-desorption by Brunauer-Emmett-Teller (BET) analyses. Then, the catalytic activity of the prepared CoFe2O4@B2O3-SiO2 nanoparticles was tested in the synthesis of 2-substituted-3-(phenylamino)-dihydroquinazolin-4(1H)-ones in deep eutectic solvent (DES) based on choline chloride as an eco-friendly and recyclable media...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28424357/thin-for-gestational-age-infants-are-at-increased-risk-of-neurodevelopmental-delay-at-2%C3%A2-years
#8
Sinéad M O'Neill, Geraldine Hannon, Ali S Khashan, J O'B Hourihane, Louise C Kenny, Mairead Kiely, Deirdre M Murray
BACKGROUND: Infants born small-for-gestational age (SGA) are at increased risk of developmental difficulties. Identifying those most at risk is challenging. We examined the effect of neonatal body composition and customised birthweight centiles on neurocognitive and behavioural outcomes at age 2. STUDY DESIGN: Prospective cohort study of term infants from the Cork BASELINE Birth Cohort Study classified into the following exposure groups: a birth weight <10th customised centile (SGA, n=51); body fat percentage at birth <10th centile (thin-for-gestational age (TGA, n=51)) or both SGA and TGA infants (small- and thin-for-gestational age (STGA), n=13)...
May 2017: Archives of Disease in Childhood. Fetal and Neonatal Edition
https://www.readbyqxmd.com/read/28423951/preparation-characterization-and-dynamical-mechanical-properties-of-dextran-coated-iron-oxide-nanoparticles-dionps
#9
Hatice Kaplan Can, Serap Kavlak, Shahed ParviziKhosroshahi, Ali Güner
Dextran-coated iron oxide nanoparticles (DIONPs) with appropriate surface chemistry exhibit many interesting properties that can be exploited in a variety of biomedical applications such as magnetic resonance imaging (MRI) contrast enhancement, tissue repair, hyperthermia, drug delivery and in cell separation. This paper reports the experimental detail for preparation, characterization and investigation of thermal and dynamical mechanical characteristics of the dextran-coated Fe3O4 magnetic nanoparticles. In our work, DIONPs were prepared in a 1:2 ratio of Fe(II) and Fe(III) salt in the HCl solution with NaOH at given temperature...
April 20, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28421404/characterization-of-zno-nanoparticles-using-superconducting-tunnel-junction-cryodetection-mass-spectrometry
#10
Logan D Plath, Zongyu Wang, Jiajun Yan, Krzysztof Matyjaszewski, Mark E Bier
Zinc oxide (ZnO) nanoparticles coated with either n-octylamine (OA) or α-amino poly(styrene-co-acrylonitrile) (PSAN) ligands (L) have been analyzed using laser desorption/ionization and matrix assisted laser desorption/ionization (MALDI) time-of-flight (TOF) superconducting tunnel junction (STJ) cryodetection mass spectrometry. STJ cryodetection has the advantage of high m/z detection and allows for the determination of average molecular weights and dispersities for 500-600 kDa ZnO-L nanoparticles. The ability to detect the relative energies deposited into the STJs has allowed for investigation of ZnO-L metastable fragmentation...
April 18, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28420870/time-resolved-visual-chiral-discrimination-of-cysteine-using-unmodified-cdte-quantum-dots
#11
Forough Ghasemi, M Reza Hormozi-Nezhad, Morteza Mahmoudi
Herein, we demonstrate a simple yet novel luminescence assay for visual chiral discrimination of cysteine. Thioglycolic acid (TGA)-capped cadmium-telluride (CdTe) quantum dots (QDs) exposing green emission were directly synthesized in aqueous solution. The interaction between cysteine molecules and CdTe QDs induced the aggregation of QDs via hydrogen bonding. As a result of electronic coupling within these aggregates, a redshift both in the absorption and emission spectra of QDs occured. The difference in the kinetics of the interactions between L- and D-cysteine with CdTe QDs led to chiral recognition of these enantiomers...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28419943/interconnectivity-of-macroporous-molecularly-imprinted-polymers-fabricated-by-hydroxyapatite-stabilized-pickering-high-internal-phase-emulsions-hydrogels-for-the-selective-recognition-of-protein
#12
Yanhua Sun, Yuqing Li, Jiangfeng Xu, Ling Huang, Tianyun Qiu, Shian Zhong
Hydroxyapatite hybridized molecularly imprinted polydopamine polymers with selective recognition of bovine hemoglobin (BHb) were successfully prepared via Pickering oil-in-water high internal phase emulsions-hydrogels and molecularly imprinting technique. The emulsions were stabilized by hydroxyapatite of which the wettability was modified by 3-methacryloxypropyltrimethoxysilane. The materials were characterized by SEM, IR and TGA. The results showed that the BHb imprinted polymers based on Pickering hydrogels (Hydro-MIPs) possess macropores ranging from 20μm to 50μm, and their large numbers of amino groups and hydroxyl groups result in a favorable adsorption capacity for BHb...
April 6, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28419713/nt-probnp-predicts-mortality-in-adults-with-transposition-of-the-great-arteries-late-after-mustard-or-senning-correction
#13
Jana Rubáčková Popelová, Markéta Tomková, Jakub Tomek
OBJECTIVE: The patients after Mustard and Senning corrections of transposition of the great arteries (TGA) are at an increased risk of unexpected death. The aim of this study was to identify markers allowing risk stratification of patients after atrial switch correction of TGA to provide them with optimum care. METHODS AND RESULTS: In this study, 87 patients were retrospectively evaluated after atrial switch correction of TGA followed-up between 2005 and 2015. The mortality during the follow-up was 9% (8 cardiac deaths)...
April 17, 2017: Congenital Heart Disease
https://www.readbyqxmd.com/read/28416399/fabrication-of-semisynthetic-collagenic-materials-for-mere-synergistic-adsorption-a-model-approach-of-determining-dye-allocation-by-systematic-characterization-and-optimization
#14
Mrinmoy Karmakar, Manas Mahapatra, Arnab Dutta, Pijush Kanti Chattopadhyay, Nayan Ranjan Singha
Bovine collagen was functionalized by extensive process modifications for fabricating tanned bovine collagen fibers (TBCFs), as a new semisynthetic macro-, meso- and micro- porous adsorbent, of unprecedented physicochemical properties and excellent industrial waste removal efficiency. Mere or interactive effects were rationally understood, via analyzing monomer-dimer equilibrium, H-/J-aggregate formation, H-bonding, metachromasia, dye-dye complex formation etc., through extensive UV-vis analyses, during removal of acidic, like Acid Brown 369 (AB369), Acid Red 131 (AR131) and Acid Blue 113 (AB113) and basic, like Methylene Blue (MB) dyes...
April 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28416398/synthesis-characterization-and-evaluation-of-poly-aminoethyl-modified-chitosan-and-its-hydrogel-used-as-antibacterial-wound-dressing
#15
Yubei Zhang, Qifeng Dang, Chengsheng Liu, Jingquan Yan, Dongsu Cha, Shengnan Liang, Xiaoli Li, Bing Fan
This study aims to develop new antibacterial hydrogel wound dressings composed of poly(aminoethyl) modified chitosan (PAEMCS). FTIR, (1)H NMR, and elemental analysis demonstrated that PAEMCS was successfully synthesized via grafting poly(aminoethyl) groups onto hydroxyl groups on chitin first, and removing acetyl groups from the grafted polymer afterward. XRD and TGA implied its well-defined crystallinity and thermostability. Furthermore, a series of hydrogels were fabricated under the participation of dipotassium hydrogen phosphate (DHP)...
April 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28415541/synthesis-characterization-of-caf2-doped-silicate-glass-ceramics
#16
Madeeha Riaz, Rehana Zia, Ambreen Mirza, Tousif Hussain, Farooq Bashir, Safia Anjum
This paper reports the fabrication and characterization of silicate glass-ceramics doped with (0-12mol%) CaF2. TGA-DSC analysis was carried out to determine the crystallization temperature and stability of glass measured by two glass parameters; Hruby parameter KH=(Tx-Tg)/(TL-Tx) and Weinberg parameter KW=(Tc-Tg)/TL. It was found that with CaF2 doping improved sinterability at low temperature and provided stability to the glass. The XRD pattern exhibits a single phase of combeite and doping of CaF2 cause increase in crystallite size...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415526/effect-of-variable-aminoalkyl-chains-on-chemical-grafting-of-cellulose-nanofiber-and-their-antimicrobial-activity
#17
Seema Saini, Mohamed Naceur Belgacem, Julien Bras
Recent focus on the preparation of antimicrobial surfaces using cellulose nanofibers (CNF) has gained considerable attention. In this work, functionalization of CNF films in 100% aqueous solution with three different aminosilanes, including 3-aminopropyl trimethoxysilane (APMS), 2-aminoethyl 3-aminopropyl trimethoxysilane (DAMS)and 3-2-(2-aminoethylamino) ethylamino propyl-trimethoxysilane (TAMS) is reported for the fabrication of contact active antimicrobial materials. Grafted CNF films were comprehensively characterized by FTIR, TGA, contact angle, elemental analysis, solid-state (29)Si NMR, FEG-SEM and SEM-EDX...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415525/mechanical-thermal-and-morphological-characterisation-of-3d-porous-pennisetum-purpureum-pla-biocomposites-scaffold
#18
R Revati, M S Abdul Majid, M J M Ridzuan, M Normahira, N F Mohd Nasir, M N Rahman Y, A G Gibson
The mechanical, thermal, and morphological properties of a 3D porous Pennisetum purpureum (PP)/polylactic acid (PLA) based scaffold were investigated. In this study, a scaffold containing P. purpureum and PLA was produced using the solvent casting and particulate leaching method. P. purpureum fibre, also locally known as Napier grass, is composed of 46% cellulose, 34% hemicellulose, and 20% lignin. PLA composites with various P. purpureum contents (10%, 20%, and 30%) were prepared and subsequently characterised...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415513/evaluation-of-radiolabeled-curcumin-loaded-solid-lipid-nanoparticles-usage-as-an-imaging-agent-in-liver-spleen-scintigraphy
#19
Arif Kursad Ayan, Ayse Yenilmez, Hayrettin Eroglu
Curcumin-loaded solid lipid nanoparticles (C-SLNs) were prepared using micro emulsion and ultrasonication methods in the first stage of this study to determine the role of C-SLN on liver-spleen scintigraphy. It was concluded that the curcumin that was encapsulated in solid lipid nanoparticles had a β' polymorph structure according to the X-ray diffraction (XRD) analysis. İt was concluded that these particles were at nano scale according to the laser diffraction (LD) analysis. Fourier transform infrared spectroscopy (FT-IR) analysis suggested an interaction between the curcumin and the solid lipid matrix, and the curcumin was loaded on the solid lipid nanoparticles...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415473/preparation-of-a-novel-bioavailable-curcuminoid-formulation-cureit%C3%A2-using-polar-nonpolar-sandwich-pns-technology-and-its-characterization-and-applications
#20
Augustine Amalraj, Shintu Jude, Karthik Varma, Joby Jacob, Sreeraj Gopi, Oluwatobi S Oluwafemi, Sabu Thomas
Health benefits of curcuminoid are highly limited due to their poor aqueous solubility, very low systemic bioavailability, fast metabolic alterations and rapid elimination. In this study, a novel bioavailable curcuminoid formulation Cureit™ was prepared by using Polar-Nonpolar-Sandwich (PNS) technology with complete natural turmeric matrix (CNTM). The synthesized bioavailable curcuminoid formulation Cureit™ was characterizations by Nuclear magnetic resonance spectroscopy (NMR), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infra-red (IR), current-voltage (I-V) study, Quadrupole Time-of-Flight Mass Spectrometry (Q-TOF), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA)...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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