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Infra-Red Spectroscopy

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https://www.readbyqxmd.com/read/28081356/canna-edulis-leaf-extract-mediated-preparation-of-stabilized-silver-nanoparticles-characterization-antimicrobial-activity-and-toxicity-studies
#1
S V Otari, S H Pawar, Sanjay K S Patel, Raushan K Singh, Sang-Yong Kim, Jai Hyo Lee, Liaoyuan Zhang, Jung-Kul Lee
A novel approach to synthesize silver nanoparticles (AgNPs) using leaf extract of Canna edulis Ker-Gawl. (CELE) under ambient conditions is reported here. The as-prepared AgNPs were analyzed by UV-visible spectroscopy, transmission emission microscopy, X-ray diffraction, Fourier transform-infra red spectroscopy, energy-dispersive analysis of X-ray spectroscopy, zeta potential, and dynamic light scattering. The AgNPs showed excellent antimicrobial activity against various pathogens, including bacteria and various fungi...
January 12, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28065750/physicochemical-properties-and-biological-activities-of-novel-blend-films-using-oxidized-pectin-chitosan
#2
Asma Chetouani, Nadège Follain, Stéphane Marais, Christophe Rihouey, Meriem Elkolli, Mahmoud Bounekhel, Djafer Benachour, Didier Le Cerf
Pectin has been widely used in a variety of biomedical applications. In this study, it was modified with sodium periodate as an oxidant and characterized by physicochemical methods Periodate oxidation increased the contents of dialdehyde units and carboxyl groups in pectin, and a decrease in pectin viscosity was measured. The oxidization reaction led to a significant decrease in all values of molecular weight and size (Mn, Mw, [η] and Rh) as determined by size exclusion chromatography (SEC), which allowed the selection of the oxidized pectin to be added to chitosan...
January 5, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28063309/qualitative-and-quantitative-changes-in-phospholipids-and-proteins-investigated-by-spectroscopic-techniques-in-animal-depression-model
#3
J Depciuch, M Sowa-Kucma, G Nowak, M Papp, P Gruca, P Misztak, M Parlinska-Wojtan
Depression becomes nowadays a high mortality civilization disease with one of the major causes being chronic stress. Raman, Fourier Transform Infra Red (FTIR) and Ultraviolet-Visible (UV-vis) spectroscopies were used to determine the changes in the quantity and structure of phospholipids and proteins in the blood serum of rats subjected to chronic mild stress, which is a common animal depression model. Moreover, the efficiency of the imipramine treatment was evaluated. It was found that chronic mild stress not only damages the structure of the phospholipids and proteins, but also decreases their level in the blood serum...
December 28, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28063301/ru-dye-grafted-cds-and-reduced-graphene-oxide-ru-cds-rgo-composite-an-efficient-and-photo-tuneable-electrode-material-for-solid-state-dye-sensitized-polymer-solar-cells
#4
Erum Nosheen, Syed Mujtaba Shah, Zafar Iqbal
This article provides a facile one step synthesis of CdS (cadmium sulphide) and CdS/rGO (reduced graphene oxide CdS nanocomposites) using DMF (N, N-Dimethyl formamide) both as a solvent and a reducing agent for the reduction of grapheme oxide. XRD (X-ray diffraction), FESEM (Field emission scanning electron microscopy), EDX (Elemental dispersive X-ray analysis), TEM (Transmission electron microscopy), UV-Vis (UV-visible) and Raman spectroscopy have been employed for the characterization of prepared samples...
December 30, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28044331/cerebral-oximetry-and-its-role-in-adult-cardiac-non-cardiac-surgery-and-resuscitation-from-cardiac-arrest
#5
REVIEW
D W Green, G Kunst
Monitors using near-infra red spectroscopy to assess cerebral oxygenation levels non-invasively in discrete areas of the brain have been used clinically for over 20 years. Interest has intensified recently, especially during cardiac surgery, and there are now five commercially available devices. Despite the attraction of being able to measure oxygen supply/demand in such a critical area, there has been only limited uptake of this technology in overall clinical anaesthetic practice. This narrative review aims to explore not only the rationale for using this technology but also the factors which have restricted its more widespread use...
January 2017: Anaesthesia
https://www.readbyqxmd.com/read/28039786/dna-interaction-antimicrobial-antioxidant-and-anticancer-studies-on-cu-ii-complexes-of-luotonin-a
#6
M P Kesavan, G G Vinoth Kumar, J Dhaveethu Raja, K Anitha, S Karthikeyan, J Rajesh
Luotonin A (L), a novel natural cytotoxic and anti-inflammatory alkaloid, chelated with copper(II) to improve its cytotoxic effect against the cancer cells. The complexes [Cu(L)H2OCl]Cl (1) and [Cu(L)2]Cl2 (2) are prepared by using copper(II) chloride and L with ligand/metal molar ratio of 1:1 and 2:1 respectively. A solution of complexes 1 &2 are characterized by physical spectroscopic methods using Ultraviolet-visible (UV-Vis) spectrophotometer, Fourier Transform-Infra red (FT-IR) spectroscopy, Electron Para magnetic Resonance Spectroscopy (EPR) and by electrochemical methods...
December 22, 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28028928/new-phthalimide-appended-schiff-bases-studies-of-dna-binding-molecular-docking-and-antioxidant-activities
#7
Pattan Sirajuddin Nayab, Akrema, Istikhar A Ansari, Mohammad Shahid, Rahisuddin
Herein, we investigated new phthalimide-based Schiff base molecules as promising DNA-binding and free radical scavenging agents. Physicochemical properties of these molecules were demonstrated on the basis of elemental analysis, ultraviolet-visible (UV-Vis), infra-red (IR), (1) H and (13) C nuclear magnetic resonance (NMR) spectroscopy. All spectral data are agreed well with the proposed Schiff base framework. The DNA-binding potential of synthesized compounds were investigated by means of UV-visible, fluorescence, iodide quenching, circular dichroism, viscosity and thermal denaturation studies...
December 28, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28004343/naproxen-microparticulate-systems-prepared-using-in-situ-crystallisation-and-freeze-drying-techniques
#8
Amanda Solaiman, Adam Keenan Tatari, Amal Ali Elkordy
Poor drug solubility and dissolution rate remain to be one of the major problems facing pharmaceutical scientists, with approximately 40% of drugs in the industry categorised as practically insoluble or poorly water soluble. This in turn can lead to serious delivery challenges and poor bioavailability. The aim of this research was to investigate the effects of the surfactants, poloxamer 407 (P407) and caprol® PGE 860 (CAP), at various concentrations (0.1, 0.5, 1 and 3% w/v) on the enhancement of the dissolution properties of poorly water-soluble drug, naproxen, using in situ micronisation by solvent change method and freeze-drying...
December 21, 2016: AAPS PharmSciTech
https://www.readbyqxmd.com/read/27992215/infrared-spectroscopy-of-gas-phase-m-co2-n-m-co-rh-ir-ion-molecule-complexes
#9
Andreas Iskra, Alexander S Gentleman, Aras Kartouzian, Michael J Kent, Alastair P Sharp, Stuart R Mackenzie
The structures of gas-phase M(+)(CO2)n (M = Co, Rh, Ir; n = 2-15) ion-molecule complexes have been investigated using a combination of infrared resonance-enhanced photodissociation (IR-REPD) spectroscopy and density functional theory. The results provide insight into fundamental metal ion-CO2 interactions, highlighting the trends with increasing ligand number and with different group 9 ions. Spectra have been recorded in the region of the CO2 asymmetric stretch around 2350 cm(-1) using the inert messenger technique and their interpretation has been aided by comparison with simulated infrared spectra of calculated low-energy isomeric structures...
January 3, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/27987943/evaluation-of-folic-acid-tagged-aminated-starch-zno-coated-iron-oxide-nanoparticles-as-targeted-curcumin-delivery-system
#10
Chinmayee Saikia, Monoj K Das, Anand Ramteke, Tarun K Maji
The role of 'superparamagnetic iron oxide nanoparticles' has gained considerable interest in various biomedical applications. However extensive researches are still going on to modify the nanoparticle size, surface properties etc. in order to get full benefit of the material. In this study, iron oxide nanoparticles have been modified with folic acid tagged aminated starch/ZnO coating to formulate a targeted drug delivery system. The nanoparticles were characterized by Fourier Transform Infra-red Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy and Transmission Electron Microscopy...
February 10, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27903085/bio-medically-active-zinc-oxide-nanoparticles-synthesized-by-using-extremophilic-actinobacterium-streptomyces-sp-ma30-and-its-characterization
#11
Thangavel Shanmugasundaram, Ramasamy Balagurunathan
The present study describes the synthesis of zinc oxide nanoparticles (ZnO-NPs) using an extremophilic actinobacterial cell-free extract, supplied with aqueous zinc acetate solution. Crystalline nature, morphological features, and polydispersed nanoparticles size (15-30 nm) were identified by X-ray diffraction (XRD), atomic force and electron microscopic analysis with dynamic light scattering (DLS) study. The interaction between biomolecules and ZnO-NPs was analyzed using Fourier transform infra-red spectroscopy (FT-IR)...
November 30, 2016: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/27889528/tailoring-shape-and-size-of-biogenic-silver-nanoparticles-to-enhance-antimicrobial-efficacy-against-mdr-bacteria
#12
Madhuree Kumari, Shipra Pandey, Ved Prakash Giri, Arpita Bhattacharya, Richa Shukla, Aradhana Mishra, C S Nautiyal
Spherical, rectangular, penta, and hexagonal silver nanoparticles of different dimensions were biosynthesized in an eco-friendly manner by biocontrol agent, Trichoderma viride by manipulating physical parameters, pH, temperature, and reaction time. The particles were characterized by UV-vis spectroscopy; Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM) and Fourier Transform Infra-red Spectroscopy (FTIR). Shape and size dependent antimicrobial activity of nanoparticles against human pathogens was observed...
November 23, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27876382/amperometric-triglyceride-bionanosensor-based-on-nanoparticles-of-lipase-glycerol-kinase-glycerol-3-phosphate-oxidase
#13
C S Pundir, V Aggarwal
The nanoparticles (NPs) aggregates of lipase from porcine pancreas, glycerol kinase (GK) from Cellulomonas sp. and glycerol-3-phosphate oxidase (GPO) from Aerococcus viridanss were prepared by desolvation and glutaraldehyde crosslinking and functionalized by cysteamine. These enzyme nanoparticles (ENPs) were characterized by transmission electron microscopy (TEM) and Fourier transform infra red (FTIR) spectroscopy. The functionalzed ENPs aggregates were co-immobilized covalently onto polycrystalline Au electrode through thiolated bond...
January 15, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27874198/crataeva-nurvala-nanoparticles-inhibit-virulence-factors-and-biofilm-formation-in-clinical-isolates-of-pseudomonas-aeruginosa
#14
Syed Ghazanfar Ali, Mohammad Azam Ansari, Haris M Khan, Mohammad Jalal, Abbas Ali Mahdi, Swaranjit Singh Cameotra
Green synthesized nanoparticles have gained great attention due to their non-toxic and non-hazardous nature. In the present study, bark extract of the medicinal plant in Ayurveda Crataeva nurvala (Buch-Ham) (CN) was chosen for the biosynthesis of silver nanoparticles (AgNPs). These NPs were characterized by Ultra violet visible spectroscopy, Fourier Transform Infra Red, Atomic Force Microscopy, and Transmission Electron Microscopy (TEM). The average particle size of green synthesized CN-AgNPs was 15.2 ± 1...
November 22, 2016: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/27873287/non-invasive-and-non-destructive-examination-of-artistic-pigments-paints-and-paintings-by-means-of-x-ray-methods
#15
REVIEW
Koen Janssens, Geert Van der Snickt, Frederik Vanmeert, Stijn Legrand, Gert Nuyts, Matthias Alfeld, Letizia Monico, Willemien Anaf, Wout De Nolf, Marc Vermeulen, Jo Verbeeck, Karolien De Wael
Recent studies are concisely reviewed, in which X-ray beams of (sub)micrometre to millimetre dimensions have been used for non-destructive analysis and characterization of pigments, minute paint samples, and/or entire paintings from the seventeenth to the early twentieth century painters. The overview presented encompasses the use of laboratory and synchrotron radiation-based instrumentation and deals with the use of several variants of X-ray fluorescence (XRF) as a method of elemental analysis and imaging, as well as with the combined use of X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS)...
December 2016: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/27810458/effect-of-hyperoxia-on-cerebral-blood-flow-velocity-and-regional-oxygen-saturation-in-patients-operated-upon-for-severe-traumatic-brain-injury-the-influence-of-cerebral-blood-flow-autoregulation
#16
Sarasa Sahoo, Veena Sheshadri, Kamath Sriganesh, K R Madhsudana Reddy, M Radhakrishnan, G S Umamaheswara Rao
BACKGROUND: The effect of normobaric hyperoxia on brain oxygenation in the presence or absence of intact autoregulation has not been studied till now in acute traumatic brain injury (TBI). METHODS: In this prospective clinical investigation in fifty patients operated for severe TBI, cerebral blood flow (CBF) velocity in the middle cerebral artery (MCA) was measured using transcranial doppler (TCD). Regional cerebral oxygen saturation (rSO2) using near infra-red spectroscopy (NIRS) at three different inspired oxygen fractions (FiO2 of 0...
October 31, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27773306/synthesis-of-chitosan-capped-copper-oxide-nanoleaves-using-high-intensity-30khz-ultrasound-sonication-and-their-application-in-antifouling-coatings
#17
Tamilselvan Abiraman, Ethirajan Ramanathan, Ganapathy Kavitha, Ramasamy Rengasamy, Sengottuvelan Balasubramanian
The synthesis of chitosan capped copper oxide nanoleaves (CCCO NLs) was carried out under three different reaction conditions viz. 1) room temperature, 2) 70°C and 3) high intensity ultrasound (30kHz) sonication method and it has been found that the high intensity ultrasound (30kHz) sonication is the best method when compared to other two methods. The advantages of the present synthetic method are: i) easy one step process, ii) lesser reaction time, iii) good yield, iv) reproducible and v) calcination is not required...
January 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/27771370/novel-non-%C3%AE-lactam-inhibitor-of-%C3%AE-lactamase-tem-171-based-on-acylated-phenoxyaniline
#18
V G Grigorenko, I P Andreeva, M Yu Rubtsova, I M Deygen, R L Antipin, A G Majouga, A M Egorov, D A Beshnova, J Kallio, C Hackenberg, V S Lamzin
The microbial resistance to antibiotics is a genuine global threat. Consequently, a search of new inhibitors remains of acute importance due to the increasing spread of multidrug resistance. Here we present a new type of non-β-lactam β-lactamase inhibitor PA-34 based on natural phenoxyaniline, identified using computer-assisted screening of scaffolds related to those of known low-affinity inhibitors. The compound displays reversible competitive inhibition of bacterial β-lactamase TEM-171, with a Ki of 88 μM...
January 2017: Biochimie
https://www.readbyqxmd.com/read/27770906/preparation-of-collagen-peptide-functionalized-chitosan-nanoparticles-by-ionic-gelation-method-an-effective-carrier-system-for-encapsulation-and-release-of-doxorubicin-for-cancer-drug-delivery
#19
S Anandhakumar, G Krishnamoorthy, K M Ramkumar, A M Raichur
In recent years, nanoparticles (NPs) based on biopolymers or peptides are gaining popularity for the encapsulation and release of drug molecules, especially for cancer therapy, due to their ability for targeted and controlled release. The use of collagen peptide (CP) for the preparation of chitosan (CN) NPs is especially interesting as it results in NPs that are stable under physiological conditions. In this work, mono-dispersed pH responsive CPCN NPs of about 100nm were prepared via ionic gelation method by simple and mild co-precipitation of CN and CP...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27750431/elemental-analysis-of-chinese-black-inks-on-xuan-paper-by-arf-laser-excited-plume-fluorescence
#20
Yue Cai, Zhengyu Huang, Michelle H C Cheung, Vincent Motto-Ros, Po-Chun Chu, Yuanwei Wang, Haoyi Zhong, Ronald Yuen, Kelvin S Y Leung, Judy T S Lum, Sut-Kam Ho, Nai-Ho Cheung
Chemical analysis of Chinese black ink on xuan paper is useful for the authentication of Asian artwork. The analysis has to be nondestructive and has to accommodate artworks of all sizes. We apply three analytical techniques, ArF laser-induced plume fluorescence, Fourier transform infrared (FTIR) spectroscopy, and portable X-ray fluorescence (pXRF) to analyze five commercial Chinese black inks on two kinds of xuan paper. The FTIR signal is found to be interfered by the substrate which is inevitable because the pigments diffuse extensively into the xuan fiber network...
November 15, 2016: Analytical Chemistry
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