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Infra-Red Spectroscopy

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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
#1
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
https://www.readbyqxmd.com/read/28392383/fibrillar-assembly-of-bacterial-cellulose-in-the-presence-of-wood-based-hemicelluloses
#2
Paavo A Penttilä, Tomoya Imai, Junji Sugiyama
Composite materials mimicking the plant cell wall structure were made by culturing cellulose-producing bacteria together with secondary-wall hemicelluloses from wood. The effects of spruce galactoglucomannan (GGM) and beech xylan on the nanoscale morphology of bacterial cellulose were studied in the original, hydrated state with small-angle X-ray scattering (SAXS). The SAXS intensities were fitted with a model covering multiple levels of the hierarchical structure. Additional information on the structure of dried samples was obtained using scanning and transmission electron microscopy and infra-red spectroscopy...
April 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28381862/synthesis-and-characterization-of-porous-mnco2o4-for-electrochemical-determination-of-cadmium-ions-in-water-samples
#3
Murugan Velmurugan, Shen-Ming Chen
To utilize the maximum activity of nanomaterials, it was specifically synthesized by appropriate physicochemical properties. In that aspect, we have described the synthesis of porous MnCo2O4 by simple chemical route and applied for the selective detection of cadmium (Cd (II)). The as-prepared porous MnCo2O4 was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) adsorption isotherm, X-ray diffraction pattern analysis (XRD), Fourier transform infra-red spectroscopy (FT-IR), energy dispersive X-ray (EDX) and electrochemical techniques...
April 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28375669/significant-solubility-of-carbon-dioxide-in-soluplus%C3%A2-facilitates-impregnation-of-ibuprofen-using-supercritical-fluid-technology
#4
Rana Obaidat, Mohammed Alnaief, Philip Jaeger
Treatment of Soluplus® with supercritical carbon dioxide allows promising applications in preparing dispersions of amorphous solids. Several characterization techniques ware employed to reveal this effect, including CO2 gas sorption under high pressure and physicochemical characterizations techniques. A gravimetric method was used to determine the solubility of carbon dioxide in the polymer at elevated pressure. The following physicochemical characterizations were used: thermal analysis, X-ray diffraction, Fourier transform, infra-red spectroscopy and scanning electron microscopy...
April 4, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28373663/single-pd-atoms-on-%C3%AE-al2o3-010-surface-do-not-catalyze-no-oxidation
#5
Chaitanya K Narula, Lawrence F Allard, Melanie Moses-DeBusk, G Malcom Stocks, Zili Wu
New convenient wet-chemistry synthetic routes have made it possible to explore catalytic activities of a variety of single supported atoms, however, the single supported atoms on inert substrates (e.g. alumina) are limited to adatoms and cations of Pt, Pd, and Ru. Previously, we have found that single supported Pt atoms are remarkable NO oxidation catalysts. In contrast, we report that Pd single atoms are completely inactive for NO oxidation. The diffuse reflectance infra-red spectroscopy (DRIFTS) results show the absence of nitrate formation on catalyst...
April 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28372752/ultrasensitive-and-selective-4-aminophenol-chemical-sensor-development-based-on-nickel-oxide-nanoparticles-decorated-carbon-nanotube-nanocomposites-for-green-environment
#6
Mohammad Musarraf Hussain, Mohammed M Rahman, Abdullah M Asiri
Nickel oxide nanoparticles decorated carbon nanotube nanocomposites (NiO·CNT NCs) were prepared in a basic medium by using facile wet-chemical routes. The optical, morphological, and structural properties of NiO·CNT NCs were characterized using Fourier transformed infra-red (FT-IR), Ultra-violet visible (UV/Vis) spectroscopy, field-emission scanning electron microscopy (FESEM), X-ray energy dispersed spectroscopy (XEDS), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (XRD) methods. Selective 4-aminophenol (4-AP) chemical sensor was developed by a flat glassy carbon electrode (GCE, surface area: 0...
March 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28364033/case-report-acute-facial-swelling-in-a-recreational-technical-diver
#7
Peter Buzzacott, William K Dolen, James Chimiak
A recreational scuba diver wore a second scuba regulator against his face during a scuba dive, attached by an elastic rubber cord necklace. After surfacing, the diver's left face became swollen. Through a process of elimination all other items of scuba equipment were excluded as potential causes. A dive with the same equipment minus the necklace confirmed the involvement of the necklace in the pathogenesis of the hypersensitive reaction. In vitro ImmunoCap IgE assay was positive to latex (1.30 kUa/L), subsequent patch testing for contact dermatitis provoked a reaction for benzophenone-4, (a UV stabalizer) and Fourier Transform Infra Red spectroscopy identified the elastic as ethylene propylene rubber, containing additional unidentified compounds...
April 2017: Physiological Reports
https://www.readbyqxmd.com/read/28363648/studies-on-electrochemical-glucose-sensing-antimicrobial-activity-and-cytotoxicity-of-fabricated-copper-nanoparticle-immobilized-chitin-nanostructure
#8
Dhanasekaran Solairaj, Palanivel Rameshthangam, Palanisamy Muthukumaran, Jeyaraj Wilson
In this study, copper nanoparticle immobilized chitin nanocomposite (CNP/CuNP) was synthesized and used for the development of non-enzymatic electrochemical sensor. The CNP/CuNP was characterized by X-ray diffraction (XRD), fourier transform infra red (FTIR) spectroscopy and high resolution transmission electron microscopy (HRTEM) analysis. The glucose sensing property of CNP/CuNP was investigated by cyclic voltammetry (CV) and chronoamperometry (CA). As a result of the synergistic effect of CNP and CuNP, the modified electrode displayed effective electro-oxidation of glucose in 0...
March 28, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28363563/tethering-antimicrobial-peptides-onto-chitosan-optimization-of-azide-alkyne-click-reaction-conditions
#9
Mariana Barbosa, Nuno Vale, Fabíola M T A Costa, M Cristina L Martins, Paula Gomes
Antimicrobial peptides (AMP) are promising alternatives to classical antibiotics, due to their high specificity and potency at low concentrations, and low propensity to elicit pathogen resistance. Immobilization of AMP onto biomaterials is an emergent field of research, towards creation of novel antimicrobial materials able to avoid formation of biofilms on the surfaces of medical devices. Herein, we report the chemical route towards one such material, where chitosan was used as biocompatible carrier for the covalent grafting of Dhvar-5, a well-known potent AMP, via the chemoselective ("click") Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC)...
June 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28359857/effect-of-e-beam-sterilization-on-the-in-vivo-performance-of-conventional-uhmwpe-tibial-plates-for-total-knee-arthroplasty
#10
Shine Tone, Masahiro Hasegawa, Giuseppe Pezzotti, Leonardo Puppulin, Akihiro Sudo
Although the introduction of highly cross-linked polyethylene is effective in reducing the amount of wear, there are still major concerns regarding the use of this material in total knee arthroplasty (TKA), essentially due to the reduction of fatigue resistance and toughness. Monitoring the in-vivo performance of different types of UHMWPE is a much needed task to tackle the lack of information on which should be the most reliable choice for TKA. The present study was aimed at investigating the mid-term degradation of electron beam sterilized conventional UHMWPE tibial plates...
March 27, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28359634/synthesis-of-sub-micronic-and-nanometric-pmma-particles-via-emulsion-polymerization-assisted-by-ultrasound-process-flow-sheet-and-characterization
#11
L Baissac, C C Buron, L Hallez, P Berçot, J-Y Hihn, L Chantegrel, G Gosse
PMMA particle synthesis was performed from MMA (methyl methacrylate) and water mixtures, exposed to different ultrasonic systems and frequencies. The sonication sequence was 20kHz→580kHz→858kHz→1138kHz, and the solution was sampled after each irradiation step for polymerization. Effects of sonication parameters (time, power), polymerization method (thermo-initiated or photo-initiated), use of small amounts of surfactant (Triton X-100™ or Tween® 20) and initial MMA quantity were investigated on particle size and synthesis yields...
March 14, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28330736/hyperspectral-imaging-using-near-infrared-spectroscopy-to-monitor-coat-thickness-uniformity-in-the-manufacture-of-a-transdermal-drug-delivery-system
#12
Naresh Pavurala, Xiaoming Xu, Yellela S R Krishnaiah
Hyperspectral imaging using near infrared spectroscopy (NIRS) integrates spectroscopy and conventional imaging to obtain both spectral and spatial information of materials. The non-invasive and rapid nature of hyperspectral imaging using NIRS makes it a valuable process analytical technology (PAT) tool for in-process monitoring and control of the manufacturing process for transdermal drug delivery systems (TDS). The focus of this investigation was to develop and validate the use of Near Infra-red (NIR) hyperspectral imaging to monitor coat thickness uniformity, a critical quality attribute (CQA) for TDS...
March 19, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28330204/endophytic-fungal-isolate-mediated-biosynthesis-of-silver-nanoparticles-and-their-free-radical-scavenging-activity-and-anti-microbial-studies
#13
Vasudeva Reddy Netala, Venkata Subbaiah Kotakadi, Pushpalatha Bobbu, Susmila Aparna Gaddam, Vijaya Tartte
The present study reports that the biosynthesis of AgNPs using an endophytic fungus isolated from the ethnomedicinal plant Centella asiatica. The endophytic fungus was identified as Aspergillus versicolor ENT7 based on 18S rRNA gene sequencing (NCBI Accession number KF493864). The AgNPs synthesized were characterized by UV-visible spectroscopy, Fourier transform infra-red spectroscopy (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), particle size analyzer, and zeta potential measurements...
December 2016: 3 Biotech
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
#14
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/28324991/features-of-cerebral-oxygenation-detects-brain-injury-in-premature-infants
#15
John M O'Toole, Mmoloki Kenosi, Daragh Finn, Geraldine B Boylan, Eugene M Dempsey
Babies born prematurely can develop brain injury within days after birth. Early identification of high-risk infants enables appropriate clinical care to mitigate potential lifelong disabilities. Near infra-red spectroscopy is an established technology that can provide continuous measurements of cerebral oxygen saturation (rcSO2) over this critical period. We develop a feature set of the rcSO2 signal for the purpose of detecting brain injury. Our feature set contains amplitude, spectral, and fractal dimension features within 5 frequency bands...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28322162/arginine-complexes-with-simvastatin-apparent-solubility-in-vitro-dissolution-and-solid-state-characterization
#16
Mmr Meor Mohd Affandi, Minaketan Tripathy, Aba Majeed
Categorized as a Biopharmaceutics Classification System (BCS) Class II drugs, statin exhibit low aqueous solubility and bioavailability thus presenting an obstacle and great challenge to formulation researchers. This paper describes a de novo approach to enhance the aqueous solubility of one of the most commonly prescribed statins i.e. simvastatin (SMV) by forming a complex (SMV-ARG) with cosolute arginine (ARG). The complex has been characterized for its apparent solubility and in vitro dissolution. The solid state characterization has been carried out using Fourier Transform Infra-Red (FTIR) Spectroscopy, Elemental Analysis, X-Ray Powder Diffraction (XRD), Differential Scanning Calorimetry (DSC) analysis, Thermal Gravimetric Analysis (TGA) and Scanning Electron Microscopy (SEM)...
March 20, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/28320456/thiolation-of-arabinoxylan-and-its-application-in-the-fabrication-of-controlled-release-mucoadhesive-oral-films
#17
Muhammad Hanif, Muhammad Zaman
BACKGROUND: Mucoadhesion is an important property that helps oral drug delivery system to remain attached with buccal mucosa and hence to improve the delivery of the drug. The current study was designed to achieve the thiol modification of Arabinoxylan (ARX) and to develop a mucoadhesive oral film for the improved delivery of tizanidine hydrochloride (TZN HCl). METHOD: Synthesis of thiolated arabinoxylan (TARX) was accomplished by esterification of ARX with thioglycolic acid (TGA)...
March 20, 2017: Daru: Journal of Faculty of Pharmacy, Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28296422/quantum-dynamics-and-spectroscopy-of-ab-initio-liquid-water-the%C3%A2-interplay-of-nuclear-and-electronic-quantum-effects
#18
Ondrej Marsalek, Thomas E Markland
Understanding the reactivity and spectroscopy of aqueous solutions at the atomistic level is crucial for the elucidation and design of chemical processes. However, the simulation of these systems requires addressing the formidable challenges of treating the quantum nature of both the electrons and nuclei. Exploiting our recently developed methods that provide acceleration by up to 2 orders of magnitude, we combine path integral simulations with on-the-fly evaluation of the electronic structure at the hybrid density functional theory level to capture the interplay between nuclear quantum effects and the electronic surface...
March 22, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28291304/mitochondrial-dysfunction-in-calf-muscles-of-patients-with-combined-peripheral-arterial-disease-and-diabetes-type-2
#19
Brian Lindegaard Pedersen, Niels Bækgaard, Bjørn Quistorff
BACKGROUND: This study elucidate the effects on muscle mitochondrial function in patients suffering from combined peripheral arterial disease (PAD) and type 2 diabetes (T2D) and the relation to patient symptoms and treatment. METHODS: Near Infra Red Spectroscopy (NIRS) calf muscle exercise tests were conducted on Forty subjects, 15 (PAD), 15 (PAD+T2D) and 10 healthy age matched controls (CTRL) recruited from the vascular outpatient clinic at Gentofte County Hospital, Denmark...
March 14, 2017: International Angiology: a Journal of the International Union of Angiology
https://www.readbyqxmd.com/read/28278776/novel-application-of-high-density-polyethylene-mesh-as-self-forming-dynamic-membrane-integrated-into-a-bioreactor-for-wastewater-treatment
#20
P Sreeda, A B Sathya, V Sivasubramanian
In the present study, self-forming dynamic membrane (SFDM) on rigid high-density polyethylene (HDPE) mesh with a large pore size of 2 mm is reported for the first time. The system was investigated for utilisation in simulated wastewater treatment by integrating the mesh with an aerobic bioreactor. The SFDM was analysed using Fourier transform infra-red (FT-IR) spectroscopy and visualised by scanning electron microscopy (SEM). The effect of the operating parameter on the change in composition of SFDM was also investigated...
February 28, 2017: Environmental Technology
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