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https://www.readbyqxmd.com/read/28733007/ultrasound-assisted-synthesis-of-poly-mma-co-ba-zno-nanocomposites-with-enhanced-physical-properties
#1
Maneesh Kumar Poddar, Sachin Sharma, Srinivas Pattipaka, D Pamu, Vijayanand S Moholkar
The present study reports synthesis and characterization of poly(MMA-co-BA)/ZnO nanocomposites using ultrasound-assisted in-situ emulsion polymerization. Methyl methacrylate (MMA) was copolymerized with butyl acrylate (BA), for enhanced ductility of copolymer matrix, in presence of nanoscale ZnO particles. Ultrasound generated strong micro-turbulence in reaction mixture, which resulted in higher encapsulation and uniform dispersion of ZnO (in native form - without surface modification) in polymer matrix, as compared to mechanical stirring...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732981/sonochemical-effect-on-two-new-ruthenium-ii-complexes-with-ligand-e-n-6-bromopyridin-2-yl-methylene-4-methylthio-aniline-precursors-for-synthesis-of-ruo2-nanoparticles
#2
Chang Jin, Fahime Bigdeli, Kuan-Guan Liu, Hosein Ghasempour, Mao-Lin Hu, Ali Morsali
Two novel Ru(II) complexes [(η(6)-p-cymene)RuCl(L2)]PF6 (R2) and [(η(6)-C6H6)RuCl(L2)]PF6 (R4), with ligand (E)-N-((6-bromopyridin-2-yl)methylene)-4-(methylthio)aniline (L2), were synthesized and characterized by elemental analysis, (1)H NMR, (13)C NMR and IR spectroscopy. Based on X-ray crystallography studies, complexes R2 and R4 have coordination environments with formulated (η(6)-p-cymene)Ru(N2Cl) and (η(6)-C6H6)Ru(N2Cl), respectively. The thermal stabilities of compounds R2 and R4 were studied by thermal gravimetric (TG) and differential scanning calorimetry (DSC)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732964/ultrasonic-effect-on-ruo2-nanostructures-prepared-by-direct-calcination-of-two-new-ru-ii-organic-supramolecular-polymers
#3
Chang Jin, Fahime Bigdeli, Zhi-Min Jin, Yong-Rong Xie, Mao-Lin Hu, Ali Morsali
Two novel Ru(II) complexes [(η(6)-p-cymene)RuCl(L1)]PF6 (R1) and [(η(6)-C6H6)RuCl(L1)]PF6 (R3) with ligand (E)-4-(methylthio)-N-((quinolin-2-yl)methylene)benzenamine (L1), were synthesized and investigated using elemental analysis, IR, (1)H NMR, (13)C NMR spectroscopy and X-ray crystallography. Complexes R1 and R3 have coordination environments with formulated (η(6)-p-cymene)Ru(N2Cl) and (η(6)-C6H6)Ru(N2Cl) respectively. The thermal stabilities of compounds R1 and R3 were studied by thermal gravimetric (TG) and differential scanning calorimetry (DSC)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732937/dispersion-enhancing-effect-of-sonochemically-functionalized-graphene-oxide-for-catalysing-antioxidant-efficacy-of-curcumin
#4
Shrikant S Maktedar, Parth Malik, Gopal Avashthi, Man Singh
The non-hazardous sonochemical approach has been developed for the functionalization of graphene oxide (GrO) with 5-Aminoindazole (5-AIND). The formation of f-(5-AIND) GrO is confirmed with (13)C solid state NMR, HRXPS, XRD, Raman, TGA, DSC, FTIR etc. The >80% cell viabilities on MCF-7 and Vero cell lines have confirmed the high cytocompatibility of f-(5-AIND) GrO. Additionally, the morphological impact on Vero cell line has evidently confirmed the biocompatibility of f-(5-AIND) GrO. As compared to GrO, the f-(5-AIND) GrO has demonstrated an enhanced antioxidant efficacy of 69...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28731613/polyol-structure-influences-enzymatic-hydrolysis-of-bio-based-2-5-furandicarboxylic-acid-fdca-polyesters
#5
Karolina Haernvall, Sabine Zitzenbacher, Hassan Amer, Michael Thomas Zumstein, Michael Sander, Kristopher McNeill, Motonori Yamamoto, Michael Bernhard Schick, Doris Ribitsch, Georg M Guebitz
Polyesters of 2,5-furan dicarboxylic acid (FDCA) have gained attention since they can be regarded as the bio-based alternatives to the petroleum based polyesters of terephthalic acid. However, only little is known about the biodegradation and enzymatic hydrolysis of FDCA-based polyesters. This work aimed to investigate the influence of different polyols on enzymatic hydrolysis of FDCA-based polyesters. A series of polyesters containing various polyols were synthetized and analysed regarding susceptibility to enzymatic hydrolysis by cutinase 1 from Thermobifida cellulosilytica (Thc_Cut1)...
July 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28731362/greater-cognitive-deficits-with-sleep-disordered-breathing-among-individuals-with-genetic-susceptibility-to-alzheimer-s-disease-the-multi-ethnic-study-of-atherosclerosis
#6
Dayna A Johnson, Jacqueline Lane, Rui Wang, Michelle Reid, Ina Djonlagic, Annette L Fitzpatrick, Stephen R Rapp, Luenda E Charles, Ruth O'Hara, Richa Saxena, Susan Redline
RATIONALE: There are conflicting findings regarding the link between sleep apnea and cognitive dysfunction. OBJECTIVE: Investigate associations between indicators of sleep-disordered breathing (SDB) and cognitive function in the Multi-Ethnic Study of Atherosclerosis and assess effect modification by the apolipoprotein ε-4 (APOE-ε4) allele. METHODS: A diverse population (N=1,752) underwent Type 2 in-home polysomnography, which included measurement of % sleep time <90% oxyhemoglobin saturation (%Sat<90%) and apnea-hypopnea index (AHI)...
July 21, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28727460/2d-organic-superlattice-promoted-via-combined-action-of-%C3%AF-%C3%AF-stacking-and-dipole-dipole-interaction-in-discotic-liquid-crystals
#7
Wanying Zhang, Shuai-Feng Zhang, Zhenhu Zhang, Huanzhi Yang, Ao Zhang, Xingtian Hao, Jianchuang Wang, Chunxiu Zhang, Jialing Pu
A series of discotic liquid crystals based on hexapentyloxytriphenylene (HAT5) have been investigated where one out of the six ether side chains of a triphenylene core was replaced by an ester side chain and named for 5a-5h. During the process of studying these compounds, the characteristic straight line defect of ordered columnar structure was identified by polarizing optical microscopy (POM) and liquid crystal state over a wide temperature range was obtained by differential scanning calorimetry (DSC). Basic phase structure and molecular arrangement were assigned by one-dimensional wide-angle X-ray diffraction (1D WAXD), small angle X-ray scattering (SAXS), two-dimensional wide-angle X-ray diffraction (2D WAXD) and transmission electron microscope (TEM)...
July 20, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28725887/photoresponsive-ionic-liquid-crystals-assembled-via-halogen-bond-en-route-towards-light-controllable-ion-transporters
#8
Marco Saccone, Francisco Fernandez Palacio, Gabriella Cavallo, Valentina Dichiarante, Matti Virkki, Giancarlo Terraneo, Arri Priimagi, Pierangelo Metrangolo
We demonstrate that halogen bonding (XB) can offer a novel approach for the construction of photoresponsive ionic liquid crystals. In particular, we assembled two new supramolecular complexes based on 1-ethyl-3-methylimidazolium iodides and azobenzene derivatives containing an iodotetrafluoro-benzene ring as XB donor, where the iodide anion acted as an XB acceptor. DSC and X-ray diffraction analyses revealed that the preferred stoichiometry between the XB donors and acceptors is 2 : 1, and that the iodide anions act as bidentate XB-acceptors, binding two azobenzene derivatives...
July 20, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28725868/physico-mechanical-thermal-and-morphological-properties-of-furfuryl-alcohol-2-ethylhexyl-methacrylate-halloysite-nanoclay-wood-polymer-nanocomposites-wpncs
#9
Md Rezaur Rahman, Sinin Hamdan, Josephine Chang Hui Lai, Mohammad Jawaid, Fahmi Asyadi Bin Md Yusof
In this study, the physical, morphological, mechanical and thermal properties of furfuryl alcohol/2-ethylhexyl methacrylate/halloysite nanoclay wood polymer nanocomposites (FA-co-EHMA-HNC WPNCs) were investigated. FA-co-EHMA-HNC WPNCs were prepared via an impregnation method and the properties of the nanocomposites were characterized through the weight percent gain, Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), three-point flexural test, dynamic mechanical thermal analysis (DMTA), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) analysis and moisture absorption test...
July 2017: Heliyon
https://www.readbyqxmd.com/read/28725139/hybrid-polymeric-matrices-for-oral-modified-release-of-desvenlafaxine-succinate-tablets
#10
Wael Samy, Ayman Elnoby, Hanan M El-Gowelli, Nazik Elgindy
Purpose: Desvenlafaxine succinate (DSV) is a water soluble anti-depressant drug, which is rapidly absorbed after oral administration exaggerating its side effects. The current work aimed to prepare controllable release DSV matrix to reduce DSV side effects related to its initial burst. Methods: Fifteen DSV matrix formulations were prepared using different polymers, polymer/drug ratios and matrix excipients and characterized using Differential Scanning Calorimetry (DSC), infrared (IR) spectroscopy, water uptake and in vitro DSV release...
July 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28723222/extraction-of-2-phenylethanol-pea-from-aqueous-solution-using-ionic-liquids-synthesis-phase-equilibrium-investigation-selectivity-in-separation-and-thermodynamic-models
#11
Urszula Maria Domanska, Patrycja Okuniewska, Kamil Paduszyński, Marta Królikowska, Maciej Zawadzki, Mikolaj Wieckowski
This work presents some important issues and topics related to possible extraction of 2-phenylethanol (PEA) from aqueous phase "in situ" during the biosynthesis. It consist of a series of experimental phase equilibrium measurements in binary and ternary systems. Ionic liquids (ILs) are an important new media for imaging and sensing applications because of their solvation property, thermal stability and negligible vapor pressure. However, complex procedures and non-miscibility with water are often required in PEA extraction...
July 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28722205/temperature-stability-of-proteins-analysis-of-irreversible-denaturation-using-isothermal-calorimetry
#12
Arne Schön, Benjamin R Clarkson, Maria Jaime, Ernesto Freire
The structural stability of proteins has been traditionally studied under conditions in which the folding/unfolding reaction is reversible, since thermodynamic parameters can only be determined under these conditions. Achieving reversibility conditions in temperature stability experiments has often required performing the experiments at acidic pH or other non-physiological solvent conditions. With the rapid development of protein drugs, the fastest growing segment in the pharmaceutical industry, the need to evaluate protein stability under formulation conditions has acquired renewed urgency...
July 19, 2017: Proteins
https://www.readbyqxmd.com/read/28720376/the-increase-in-positively-charged-residues-in-cecropin-d-like-galleria-mellonella-favors-its-interaction-with-membrane-models-that-imitate-bacterial-membranes
#13
José Oñate-Garzón, Alessio Ausili, Marcela Manrique-Moreno, Alejandro Torrecillas, Francisco J Aranda, Edwin Patiño, Juan C Gomez-Fernández
A comparative study of three synthetic peptides, namely neutral Cecropin D-like G. mellonella (WT) and two cationic peptides derived from its sequence, ΔM1 (+5) and ΔM2 (+9) is reported in this work. The influence of charge on the interactions between peptides and membranes and its effect on phase were studied by calorimetric assays. Differential scanning calorimetry (DSC) showed that ΔM2 peptide showed the strongest effect when the membrane contained phosphatidylcholine (PC) and phosphatidylglycerol (PG), increasing membrane fluidization...
July 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28718993/role-of-fdg-pet-mri-fdg-pet-ct-and-dynamic-susceptibility-contrast-perfusion-mri-in-differentiating-radiation-necrosis-from-tumor-recurrence-in-glioblastomas
#14
Mojgan Hojjati, Chaitra Badve, Vasant Garg, Curtis Tatsuoka, Lisa Rogers, Andrew Sloan, Peter Faulhaber, Pablo R Ros, Leo J Wolansky
BACKGROUND AND PURPOSE: To compare the utility of quantitative PET/MRI, dynamic susceptibility contrast (DSC) perfusion MRI (pMRI), and PET/CT in differentiating radiation necrosis (RN) from tumor recurrence (TR) in patients with treated glioblastoma multiforme (GBM). METHODS: The study included 24 patients with GBM treated with surgery, radiotherapy, and temozolomide who presented with progression on imaging follow-up. All patients underwent PET/MRI and pMRI during a single examination...
July 18, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28717975/development-of-a-novel-polymeric-nanocomposite-complex-for-drugs-with-low-bioavailability
#15
Mduduzi N Sithole, Yahya E Choonara, Lisa C du Toit, Pradeep Kumar, Thashree Marimuthu, Pierre P D Kondiah, Viness Pillay
Semi-synthetic biopolymer complex (SSBC) nanoparticles were investigated as a potential oral drug delivery system to enhance the bioavailability of a poorly water-soluble model drug acyclovir (ACV). The SSBCs were prepared from cross-linking of hydroxyl groups on hyaluronic acid (HA) with poly(acrylic acid) (PAA) resulting in ether linkages. Thereafter, conjugation of 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) onto HA-PAA was accomplished using a 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC)/N-hydroxysuccinimide (NHS)-promoted coupling reaction...
July 17, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28713199/isothermal-crystallization-kinetics-and-time-temperature-transformation-of-the-conjugated-polymer-poly-3-2-ethyl-hexylthiophene
#16
Liyang Yu, Emily Davidson, Anirudh Sharma, Mats R Andersson, Rachel Segalman, Christian Müller
Thermal annealing strongly impacts the nano- and microstructure of conjugated polymers. Despite the fundamental importance for the resulting optoelectronic behavior of this class of materials, the underlying crystallization processes have not received the same attention that is encountered in other disciplines of materials science. The question arises whether classical treatment of nucleation and growth phenomena is truly applicable to conjugated polymers? Here, the isothermal crystallization behavior of the conjugated polymer poly(3-(2'-ethyl)hexylthiophene) (P3EHT) is monitored with differential scanning calorimetry (DSC)...
July 11, 2017: Chemistry of Materials: a Publication of the American Chemical Society
https://www.readbyqxmd.com/read/28711767/fully-automated-subchondral-bone-segmentation-from-knee-mr-images-data-from-the-osteoarthritis-initiative
#17
Akash Gandhamal, Sanjay Talbar, Suhas Gajre, Ruslan Razak, Ahmad Fadzil M Hani, Dileep Kumar
Knee osteoarthritis (OA) progression can be monitored by measuring changes in the subchondral bone structure such as area and shape from MR images as an imaging biomarker. However, measurements of these minute changes are highly dependent on the accurate segmentation of bone tissue from MR images and it is challenging task due to the complex tissue structure and inadequate image contrast/brightness. In this paper, a fully automated method for segmenting subchondral bone from knee MR images is proposed. Here, the contrast of knee MR images is enhanced using a gray-level S-curve transformation followed by automatic seed point detection using a three-dimensional multi-edge overlapping technique...
July 8, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28711592/producing-amorphous-solid-dispersions-via-co-precipitation-and-spray-drying-impact-to-physicochemical-and-biopharmaceutical-properties
#18
Amanda K P Mann, Luke Schenck, Athanas Koynov, Alfred C F Rumondor, Xiaoling Jin, Melanie Marota, Chad Dalton
Many small molecule active pharmaceutical ingredients (APIs) exhibit low aqueous solubility, and benefit from generation of amorphous dispersions of the API and polymer to improve their dissolution properties. Spray drying and hot melt extrusion are two common methods to produce these dispersions; however, for some systems these approaches may not be optimal, and it would be beneficial to have an alternative route. Herein, amorphous solid dispersions of Compound A, a low solubility weak acid, and copovidone were made by conventional spray drying and co-precipitation...
July 12, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28710993/synthesis-physicochemical-and-optical-properties-of-bis-thiosemicarbazone-functionalized-graphene-oxide
#19
Santosh Kumar, Mohmmad Y Wani, Claudia T Arranja, Ricardo A E Castro, José A Paixão, Abilio J F N Sobral
Fluorescent materials are important for low-cost opto-electronic and biomedical sensor devices. In this study we present the synthesis and characterization of graphene modified with bis-thiosemicarbazone (BTS). This new material was characterized using Fourier transform infrared spectroscopy (FT-IR), Ultraviolet-visible (UV-Vis) and Raman spectroscopy techniques. Further evaluation by X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and atomic-force microscopy (AFM) allowed us to fully characterize the morphology of the fabricated material...
July 1, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28708115/crystal-structure-analysis-of-the-first-discovered-stability-enhanced-solid-state-of-tenofovir-disoproxil-free-base-using-single-crystal-x-ray-diffraction
#20
Ji-Hun An, Alice Nguvoko Kiyonga, Woojin Yoon, Hyung Chul Ryu, Jae-Sun Kim, Chaeri Kang, Minho Park, Hoseop Yun, Kiwon Jung
Tenofovir disoproxil (TD), an anti-virus drug, is currently marketed under its most stable form, Form-I of Tenofovir disoproxil fumarate (TDF). However, studies regarding the properties of TD free base crystal as a promising drug as well as its crystal structure have not yet been reported. This assumption was made because TD free base is not directly produced in a solid form during the manufacturing process. TD free base is first obtained in an oil form, and is then synthesized into TDF crystal. In this regard, the present study was conducted to investigate both the potentiality of TD free base to be an active pharmaceutical ingredient (API) and its crystal structure...
July 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
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