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Infra-Red Spectroscopy

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https://www.readbyqxmd.com/read/28535423/chromatographic-separation-and-detection-methods-of-aloe-arborescens-miller-constituents-a-systematic-review
#1
REVIEW
Jilan A Nazeam, Haidy A Gad, Hala M El-Hefnawy, Abdel-Naser B Singab
Aloe arborescens Miller (Family Asphodelaceae) is a member of genus Aloe, which is used in traditional medicine to cure various diseases. The extracts of the plant have been reported to possess anticancer, immunomodulator, antidiabetic, anti-inflammatory and antioxidant activities. The phytochemical investigations have revealed diverse chemical constituents, including phenolics [anthraquinones, anthrones, pyrones, chromones and coumarins], polysaccharides [arborans [(1-4) linked glucomannans, polysaccharide (A, B and C): (A: a linear (1-6)-O-α-glucan, B: a branching (1-2)-O-l-arabinose with (1-2)-O-d-galactose linkages and C: (1-4)-O-β-mannan with 18% acetyl group)]], glycoproteins and carboxypeptidase enzyme...
April 29, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28530810/seleniranium-ions-undergo-%C3%AF-ligand-exchange-via-an-associative-mechanism-in-the-gas-phase
#2
Shea Fern Lim, Benjamin Leigh Harris, George N Khairallah, Evan John Bieske, Philippe Maître, Gabriel da Silva, Brian D Adamson, Michael S Scholz, Neville J A Coughlan, Richard A J O'Hair, Michael Rathjen, Daniel Stares, Jonathan M White
Collision-induced dissociation mass spectrometry of the ammonium ions 4a and 4b results in the formation of the seleniranium ion 5, the structure and purity of which was verified using gas phase infra-red spectroscopy coupled to mass spectrometry, and gas phase ion-mobility measurements. Ion-molecule reactions between the ion 5 (m/z = 261) and cyclopentene, cyclohexene, cycloheptene and cyclooctene, resulted in the formation of the seleniranium ions 7 (m/z = 225), 6 (m/z = 239), 8 (m/z = 253), and 9 (m/z = 267) respectively...
May 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28530200/antioxidant-antibacterial-and-anticancer-properties-of-phyto-synthesised-artemisia-quttensis-podlech-extract-mediated-agnps
#3
Farinaz Ghanbar, Amir Mirzaie, Fatemeh Ashrafi, Hassan Noorbazargan, Mojgan Dalirsaber Jalali, Soheil Salehi, Seyed Ataollah Sadat Shandiz
The focus of this study is on a rapid and cost-effective approach for the synthesis of silver nanoparticles (AgNPs) using Artemisia quttensis Podlech aerial parts extract and assessment of their antioxidant, antibacterial and anticancer activities. The prepared AgNPs were determined by ultraviolet-visible spectroscopy, X-ray diffraction, Fourier transform infra-red spectroscopy, transmission electron microscopy, scanning electron microscopy, energy-dispersive spectroscopy, and dynamic light scattering and zeta-potential analysis...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28513086/photoluminescent-properties-of-novel-design-heteroleptic-zn-ii-complexes
#4
Atul C Vamja, Kiran R Surati
Three novel heteroleptic Zn(II) complexes containing 8-hydroxy quinoline and various pyrazolone-based derivatives were synthesized and their structures confirmed by (1) H-nuclear magnetic resonance, mass spectrometry, Fourier transform infra-red spectroscopy, UV-vis analysis and element analysis. All three complexes showed good photoluminescence properties in the solid state and in solution in the maximum emission range from 475 to 490 nm with a quantum yield of 0.45 to 0.51. Absorption spectra revealed that the complexes possessed a maximum absorption range of 272-281 nm with a band gap of 2...
May 16, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28468599/application-of-victorian-brown-coal-for-removal-of-ammonium-and-organics-from-wastewater
#5
Mohammad Amin Nazari, Farzad Mohaddes, Biplob Kumar Pramanik, Maazuza Othman, Tim Muster, Muhammed A Bhuiyan
Brown coal is a relatively abundant and low-cost material, which has been used as an effective ion-exchanger to remove ammonium from wastewater. In this study, the influences of pH, ammonium concentration and brown coal dose were investigated for removal of ammonium content from synthetic wastewater. Raw brown coal (RBC) treated with base solution has superior ammonium removal efficiency compared to RBC, which was due to chemical alterations and thus greater attachment of ammonium molecules to base-washed brown coal (BWBC), confirmed by fourier transform infra-red spectroscopy...
May 4, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28468278/silver-nanoparticles-mediated-by-costus-afer-leaf-extract-synthesis-antibacterial-antioxidant-and-electrochemical-properties
#6
Elias E Elemike, Omolola E Fayemi, Anthony C Ekennia, Damian C Onwudiwe, Eno E Ebenso
Synthesis of metallic and semiconductor nanoparticles through physical and chemical routes has been extensively reported. However, green synthesized metal nanoparticles are currently in the limelight due to the simplicity, cost-effectiveness and eco-friendliness of their synthesis. This study explored the use of aqueous leaf extract of Costus afer in the synthesis of silver nanoparticles (CA-AgNPs). The optical and structural properties of the resulting silver nanoparticles were studied using UV-visible spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infra-red spectrophotometer (FTIR)...
April 29, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28467699/ab-initio-excited-state-transient-raman-analysis
#7
Alessio Petrone, David B Williams-Young, David B Lingerfelt, Xiaosong Li
Time-resolved Raman spectroscopy has proven useful for studying the formation of polarons in conjugated polymers, verifying the presence of reactive intermediates in photochemical reactions, investigating nonradiative transitions in the short lifetime of the photoexcited species, and resolving electron-phonon coupling strengths and exciton dissociation in crystalline materials. In this paper, we present an excited state transient Raman analysis protocol combining ab initio direct molecular dynamics, transient excited state Hessian, and excited state nonresonant Raman activities evaluations...
May 12, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28463778/detection-of-molecular-changes-induced-by-antibiotics-in-escherichia-coli-using-vibrational-spectroscopy
#8
N T Xuan Nguyen, Samira Sarter, N Hai Nguyen, Philippe Daniel
This study aimed to test Raman (400-1800cm(-1)) and Infra-red (1900-500cm(-1)) spectroscopies followed by statistical analysis (principal component analysis) to detect molecular changes induced by antibiotics (ampicillin, cefotaxime - cell wall synthesis inhibitors, tetracycline - protein synthesis inhibitor, ciprofloxacin - DNA synthesis inhibitor) against Escherichia coli TOP10. In case of ampicillin and cefotaxime, a decrease in protein bands in both Raman (1240, 1660cm(-1)), and IR spectra (1230, 1530, 1630cm(-1)), and an increase in carbohydrate bands (1150, 1020cm(-1)) in IR spectra were observed...
April 27, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28458108/mineralization-of-pyrrole-a-recalcitrant-heterocyclic-compound-by-electrochemical-method-multi-response-optimization-and-degradation-mechanism
#9
Ajay Devidas Hiwarkar, Seema Singh, Vimal Chandra Srivastava, Indra Deo Mall
In this study, the electrochemical (EC) oxidation of a recalcitrant heterocyclic compound namely pyrrole has been reported using platinum coated titanium (Pt/Ti) electrodes. Response surface methodology (RSM) comprising of full factorial central composite design (CCD) with four factors and five levels has been used to examine the effects of different operating parameters such as current density (j), aqueous solution pH, conductivity (k) and treatment time (t) in an EC batch reactor. Pyrrole mineralization in aqueous solution was examined with multiple responses such as chemical oxygen demand (COD) (response, Y1) and specific energy consumption (SEC) in kWh/kg of COD removed (response, Y2)...
April 27, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28447666/in-situ-polymerisation-of-isoeugenol-as-a-green-consolidation-method-for-waterlogged-archaeological-wood
#10
Emily McHale, Calin C Steindal, Hartmut Kutzke, Tore Benneche, Stephen E Harding
Waterlogged archaeological wood is often in need of consolidation prior to drying to prevent shrinkage and cracking of the object. There is a need for new greener materials (than for example polyethylene glycol) and methods for consolidation to be developed. The use of wood-based components could provide good interaction between the consolidant and the remaining wood structure and would also support a shift away from fossil fuel-based materials to those with more sustainable sources. Based on this, lignin-like structures have been investigated for their ability to consolidate waterlogged archaeological wood...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28433922/effects-of-aging-on-prefrontal-brain-activation-during-challenging-walking-conditions
#11
Anat Mirelman, Inbal Maidan, Hagar Bernad-Elazari, Shiran Shustack, Nir Giladi, Jeffrey M Hausdorff
BACKGROUND: Deficits in cognitive domains, in particular, those related to the prefrontal cortex, contribute to diminished walking performance in complex conditions in older age. Studies using functional near infra-red spectroscopy (fNIRS) reported inconsistent findings of brain activation age-related changes in response to increased task demands. We aimed to study the effects of aging on gait and prefrontal activation in complex walking tasks with internal and external task demands. METHODS: Twenty-three healthy young adults (30...
April 20, 2017: Brain and Cognition
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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