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Infra-Red Spectroscopy

Juhi Saxena, Pankaj Sharma, Abhijeet Singh
Biomimetic synthesis of metal nanoparticles (NPs) is safe and eco-friendly; therefore, find diverse applications. Considering this, the soil fungi Penicillium chrysogenum strain Fungal germplasm collection centre/ BLS1 was isolated, characterized and explored to synthesize extracellular silver NPs (AgNPs) under optimised conditions. The synthesis of AgNPs was investigated using ultraviolet (UV)-visible spectroscopy, Fourier-transform infra-red spectroscopy (FTIR), transmission electron microscope (TEM) and dynamic light scattering (DLS) analysis...
August 2017: IET Nanobiotechnology
Raksha Pandit, Swapnil Gaikwad, Mahendra Rai
In the present study, the authors synthesised copper nanoparticles (CuNPs) by using extract of Zingiber officinale (ginger) and later the NPs were bioconjugated with nisin, which shows antimicrobial activity against food spoilage microorganisms. CuNPs and its bioconjugate were characterised by ultraviolet-vis spectroscopy, NP tracking analysis, Zetasizer, transmission electron microscopy analysis, X-ray diffraction and Fourier transform infra-red (FTIR) spectroscopy. Zeta potential of CuNPs and its bioconjugate were found to be very stable...
August 2017: IET Nanobiotechnology
Chaitanya K Narula, Lawrence F Allard, Zili Wu
The ab initio density functional theoretical studies show that energetics favor CO oxidation on single Pd atoms supported on θ-alumina. The diffuse reflectance infra-red spectroscopy (DRIFTS) results show that carbonates are formed as intermediates when single supported Pd atoms are exposed to a gaseous mixture of CO + O2. The rapid agglomeration of Pd atoms under CO oxidation conditions even at 6 °C leads to the presence of Pd particles along with single atoms during CO oxidation experiments. Thus, the observed CO oxidation has contributions from both single Pd atoms and Pd particles...
July 24, 2017: Scientific Reports
Swathi Sudhakar, Poornima Budime Santhosh, Ethayaraja Mani
Extracellular plaques of amyloid beta (Aβ) fibrils and neurofibrillary tangles are known to be associated with neurological diseases such as Alzheimer's. Studies have shown that spherical nanoparticles inhibit the formation of Aβ fibrils by intercepting the nucleation and growth pathways of fibrillation. In this report, gold nanorods (AuNR) are used to inhibit the formation of Aβ fibrils and the shape-dependent plasmonic properties of AuNR are exploited to faciliate faster dissolution of mature Aβ fibrils...
July 24, 2017: ACS Chemical Neuroscience
Hennie Valkenier, Volodymyr Malytskyi, Pascale Blond, Maurice Retout, Alice Mattiuzzi, Jonathan Goole, Vincent Raussens, Ivan Jabin, Gilles Bruylants
Labile ligands such as thiols and carboxylates are commonly used to functionalise AuNPs, though little control over the composition is possible when mixtures of ligands are used. It was shown recently that robustly functionalised AuNPs can be obtained through the reductive grafting of calix[4]arenes bearing diazonium groups on the large rim. Here, we report a calix[4]arene-tetra-diazonium decorated by four oligo(ethylene glycol) chains on the small rim, which upon grafting gave AuNPs with excellent stability thanks to the C-Au bonds...
July 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Pichan Saheeda, Kaviladath Sabira, Mohandas Dhaneesha, Sankaran Jayaleksmi
Highly luminescent, polymer nanocomposite films based on poly(vinyl alcohol) (PVA), and monodispersed carbon dots (C-dots) derived from multiwalled carbon nanotubes (MWCNTs), as coatings on substrates as well as free standing ones are obtained via solution-based techniques. The synthesized films exhibit pH-independent photoluminescence (PL) emission, which is an advantageous property compared with the pH-dependent photoluminescence intensity variations, generally observed for the C-dots dispersed in aqueous solution...
July 17, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Mahmoud A Sliem, Rania A Karas, M A Harith
A new ascorbic acid (AA) nanocomposite with low toxicity and high photo and thermal stability is constructed for certain dermatological applications in humans. The presented nanocomposite consists of AA, nano-hydroxyapatite (nHAp) and carboxymethyl cellulose (CMC). The physicochemical properties of such CMC-nHAp-AA nanocomposite were characterized using X-Ray diffractometery (XRD), Fourier Transform Infra-Red (FTIR), Energy Dispersive X-ray (EDX) and UV-VIS spectroscopies. The size and morphology of the synthesized nanocomposites were characterized by TEM/SEM techniques...
July 8, 2017: Journal of Photochemistry and Photobiology. B, Biology
Rema Thankappan, S V Srinivasan, R Suthanthararajan, Mika Sillanpää
The removal of phenol sulfonic acid-syntan (PSAS) in terms of chemical oxygen demand (COD) was studied at different pH, ozone and initial PSAS concentrations and the optimum condition was found to be pH 7, ozone concentration of 5.2 × 10(-3 )mmol/L and initial PSAS concentration of 500 mg/L. The increase in BOD5/COD ratio confirmed the bio-treatability of ozonated PSAS effluent. The excitation-emission matrix intensity and Fourier transmission infra-red spectroscopy confirmed the generation of intermediate by-product during degradation of PSAS...
July 27, 2017: Environmental Technology
Krzysztof Banas, Agnieszka M Banas, Sascha P Heussler, Mark B H Breese
In the contemporary spectroscopy there is a trend to record spectra with the highest possible spectral resolution. This is clearly justified if the spectral features in the spectrum are very narrow (for example infra-red spectra of gas samples). However there is a plethora of samples (in the liquid and especially in the solid form) where there is a natural spectral peak broadening due to collisions and proximity predominately. Additionally there is a number of portable devices (spectrometers) with inherently restricted spectral resolution, spectral range or both, which are extremely useful in some field applications (archaeology, agriculture, food industry, cultural heritage, forensic science)...
July 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Haizhou Lu, Yu Peng, Huanqing Ye, Xianjin Cui, Jianxu Hu, Hang Gu, Andrei N Khlobystov, Mark A Green, Philip J Blower, Peter B Wyatt, William P Gillin, Ignacio Hernández
Infra-red emission (980 nm) of sub 10 nm Yb(3+)-doped NaYF4 nanoparticles has been sensitized through the excitation of 2-hydroxyperfluoroanthraquinone chromophore (1,2,3,4,5,6,7-heptafluro-8-hydroxyanthracene-9,10-dione) functionalizing the nanoparticle surface. The sensitization is achieved with a broad range of visible light excitation (400-600 nm). The overall near infra-red (NIR) emission intensity of Yb(3+) ions is increased by a factor 300 as a result of the broad and strong absorption of the chromophore compared with ytterbium's intrinsic absorption...
July 11, 2017: Scientific Reports
Amir Hossein Mohammad Zadeh, Abdolhosein Rouholamini Najafabadi, Alireza Vatanara, Homa Faghihi, Kambiz Gilani
The influence of PEG (poly ethylene glycol) at different molecular weights and ratios was studied on the stability of freeze- dried IgG (immune globulin G). PEGs (600 to 4000 Dalton) at concentrations of 0.5 and 5% W/V were applied in the presence of 40 and 60% W/W of trehalose to prepare freeze- dried IgG formulations. Size- exclusion chromatography, Infra- red spectroscopy, Differential scanning calorimetery and Gel electrophoresis were performed to characterize lyophilized samples. Pure IgG demonstrated the highest aggregation of 5...
July 10, 2017: Drug Development and Industrial Pharmacy
Rachel W Mulheren, Christy L Ludlow
Sensory input can alter swallowing control in both the cortex and brainstem. Electrical stimulation of superior laryngeal nerve afferents increases reflexive swallowing in animals, with different frequencies optimally effective across species. Here we determined: 1) if neck vibration overlying the larynx affected the fundamental frequency of the voice demonstrating penetration of vibration into the laryngeal tissues, and 2) if vibration, in comparison with sham, increased spontaneous swallowing and enhanced cortical hemodynamic responses to swallows in the swallowing network...
July 5, 2017: Journal of Neurophysiology
Venkatesan S Thimmakondu, Amir Karton
We use high-level ab initio CCSD(T) and CCSDT(Q) methods to investigate the energetic and spectroscopic properties of nine low-lying isomers of C7H2, which lie within 1 eV. Among these, heptatriynylidene (1), 1-(buta-1,3-diynyl)cyclopropenylidene (2) and heptahexaenylidene (9) have been detected experimentally. The other six isomers, 1,2-(diethynyl)cyclopropenylidene (3), bicyclo[4.1.0]hepta-1,2,4,5-tetraene-7-ylidene (4), cyclohepta-1,2,3,4-tetraen-6-yne (5), bicyclo[4.1.0]hepta-4,6-diene-2-yne-7-ylidene (6), bicyclo[4...
July 21, 2017: Physical Chemistry Chemical Physics: PCCP
Amit Kumar, Mu Naushad, Anamika Rana, Inamuddin, Preeti, Gaurav Sharma, Ayman A Ghfar, Florian J Stadler, Mohammad R Khan
In this research work we report Gum-ghatti supported ZnSe-WO3 nano-hetero-assembly for solar powered degradation of endocrine disruptor Bisphenol S (BPA). The photocatalyst was characterized by Scanning electron microscopy (SEM), High resolution transmission electron microscopy (HRTEM), Small area electron diffraction (SAED), X-Ray diffraction (XRD), Fourier transform infra red spectroscopy (FTIR), Photoluminescence (PL), Energy dispersive X-ray (EDX), UV-vis spectrophotometry and Brauner Emmet Teller surface area analyzer (BET)...
July 1, 2017: International Journal of Biological Macromolecules
Ramaswamy Shanmugam, Dwarampudi L Priyanka, Kadiyala Madhuri, Kuppuswamy Gowthamarajan, Veera Venkata Satyanarayana Reddy Karri, Chivarama K Ashok Kumar, Paranjothy Murali
Curcumin and Rutin are natural polyphenolic molecules exhibits several pharmacological actives like antibacterial, anticancer, antioxidant, chemo-preventive and anti-inflammatory properties. However till date, no studies have been reported on their combination efficacy, especially in treating multi-drug resistance of cancers because of their poor solubility and bioavailability. Hence in the present study, an attempt has been made to load both these drugs into a single nanoparticlulate system to enhance their bioavailability and efficacy...
June 28, 2017: International Journal of Biological Macromolecules
Souad A Elfeky, Shymaa Ebrahim Mahmoud, Ahmed Fahmy Youssef
This study investigated the elimination of Cr(VI) from aqueous solution utilizing a composite from magnetic nanoparticles (Fe3O4) capped with cetyltrimethylammonium bromide (CTAB). The structure of the prepared composite system was examined by Fourier Transform Infra Red Spectroscopy (FTIR), X-ray Diffractometry (XRD), and Transmission Electron Microscopy (TEM). Separation of the Fe3O4/CTAB composite from the wastewater can be achieved by application of an external magnetic field. Factors affecting the Cr(VI) expulsion from wastewater such as pH, competing ions, the dosage level of the nanoparticles, and contact time were studied...
July 2017: Journal of Advanced Research
Refael Minnes, Mati Nissinmann, Yael Maizels, Gabi Gerlitz, Abraham Katzir, Yosef Raichlin
The vast majority of cancer related deaths are caused by metastatic tumors. Therefore, identifying the metastatic potential of cancer cells is of great importance both for prognosis and for determining the correct treatment. Infrared (IR) spectroscopy of biological cells is an evolving research area, whose main aim is to find the spectral differences between diseased and healthy cells. In the present study, we demonstrate that Attenuated Total Reflection Fourier Transform IR (ATR-FTIR) spectroscopy may be used to determine the metastatic potential of cancer cells...
June 29, 2017: Scientific Reports
Pavlina Holcapkova, Martina Hrabalikova, Petra Stoplova, Vladimir Sedlarik
This work is focused on preparation of novel porous type of core-shell-structured microparticles based on polylactide (shell) and poly(vinyl alcohol) cross-linked with glutaric acid (GA) (core) prepared by water-in-oil-in-water solvent evaporation technique. The microparticle systems were used as delivery systems for immobilisation of model antibacterial agent - nisin. The effect of cross-linking and the initial amount of nisin on their morphology was investigated using scanning electron microscopy, BET analysis, zeta potential measurement and Fourier transform infra-red spectroscopy...
June 21, 2017: Journal of Microencapsulation
Sumathi Poomalai, Anju Kannan Padinjareveetil, Sivaraj Ramasamy, Tamil Selvan Govindaraj, Mosae Selvakumar Paulraj, Israel Vijayaraj Muthu Vijayan Enoch
Ion-induced change in fluorescence is a straight-forward method for detection of toxic metal ions showing immediate response. Cadmium ions are toxic to the environment. We report in this paper a piperidine-4-one-based fluorescent chemosensor of Cd(2+) ions, designed and synthesized by a simple method. The compound is characterized using infra-red (IR) and (1) H-NMR spectral techniques. The chemosensor showed Cd(2+) ion selectivity and sensitivity in aqueous solution. The stoichiometry and the binding constants were determined using fluorescence spectroscopy...
June 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
Mustafa Khan, Tasneem Gul Kazi, Hassan Imran Afridi, Sirajuddin, Muhammad Bilal, Asma Akhtar, Sabir Khan, Salma Kadar
BACKGROUND: Epidemiological data among the human population has shown a significantly increased incidence of gallstone (GS) disease worldwide. It was studied that some essential (calcium) and transition elements (iron and copper) in bile play an important role in the development of GS. METHOD: The estimation of calcium, copper and iron were carried out in the serum, gall bladder bile and different types of GS (cholesterol, mixed and pigmented) of 172 patients, age ranged 20-55years...
June 15, 2017: Clinica Chimica Acta; International Journal of Clinical Chemistry
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