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Infra-Red Spectroscopy

Yue Cai, Zhengyu Huang, Michelle Hoi Ching Cheung, Vincent Motto-Ros, Po-Chun Chu, Yuanwei Wang, Haoyi Zhong, Ronald Yuen, Kelvin Sze-Yin Leung, Judy T S Lum, Sut Kam Phoebe Ho, Nai Ho H Cheung
Chemical analysis of Chinese black ink on xuan paper is useful for the authentication of Asian artwork. The analysis has to be non-destructive and has to accommodate artworks of all sizes. We apply three analytical techniques, ArF laser-induced plume fluorescence, Fourier transform infra-red (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...
October 18, 2016: Analytical Chemistry
Anne-Laure Chateigner-Boutin, José J Ordaz-Ortiz, Camille Alvarado, Brigitte Bouchet, Sylvie Durand, Yves Verhertbruggen, Yves Barrière, Luc Saulnier
Cell walls are comprised of networks of entangled polymers that differ considerably between species, tissues and developmental stages. The cell walls of grasses, a family that encompasses major crops, contain specific polysaccharide structures such as xylans substituted with feruloylated arabinose residues. Ferulic acid is involved in the grass cell wall assembly by mediating linkages between xylan chains and between xylans and lignins. Ferulic acid contributes to the physical properties of cell walls, it is a hindrance to cell wall degradability (thus biomass conversion and silage digestibility) and may contribute to pest resistance...
2016: Frontiers in Plant Science
Junjie Li, Alexander B Pacheco, Krishnan Raghavachari, Srinivasan S Iyengar
We probe the structure, stability and vibrational properties of the fundamental C2H3(+) carbocation that exists with preference in a bridged hydrogen conformation. Our computational study includes electronic structure treatment, incorporation of nuclear motion through classical and quantum paradigms, the effect of temperature, and the associated sampling of the potential surface, and the effect of single H/D isotopic substitution (i.e., C2H2D(+)). We find that while the non-classical, "Bridged" isomer is most stable, the "Classical" form does have a small presence under ambient conditions since the zero point level straddles the barrier between the Classical and Bridged isomers in a reduced dimensional analysis of the Bridged ↔ Classical transfer coordinate...
October 13, 2016: Physical Chemistry Chemical Physics: PCCP
Atef Thamri, Hamdi Baccar, Claudia Struzzi, Carla Bittencourt, Adnane Abdelghani, Eduard Llobet
The chemical modification of multiwalled carbon nanotubes (MWCNTs) with a long chain mercapto acid is reported as a way to improve sensitivity and response time of gas sensors for detecting alcohols, acetone and toxic gases such as DMMP. We have developed sensors employing MWCNTs decorated with gold nanoparticles and modified with a 16-mercaptohexadecanoic acid (MHDA) monolayer. Morphological and compositional analysis by Transmission Electron Microscopy (TEM), Fourier Transform Infra-red Spectroscopy (FTIR) and X-ray photoelectron spectroscopy were performed to characterize the gold nanoparticles and to check the bonding of the thiol monolayer...
October 10, 2016: Scientific Reports
Saravanan Krishnan, Shoba Narayan, Anju Chadha
The cell free extracts of Candida parapsilosis ATCC 7330 are more efficient than the whole resting cells of the yeast in the synthesis of directly usable gold nanoparticles as revealed by this systematic study. Cell free extracts yielded gold nanoparticles of hydrodynamic diameter (50-200 nm). In this study, the total protein concentration influences the nanofabrication and not only the reductase enzymes as originally thought. Powder X-ray diffraction studies confirm the crystalline nature of the gold nanoparticles...
December 2016: AMB Express
Mitulkumar A Patel, Mohamed H H AbouGhaly, Jacqueline V Schryer-Praga, Keith Chadwick
The ability to engineer biocompatible polymers with controllable properties is highly desirable. One such approach is to cross-link carbohydrate polymers using ionotropic gelation (IG). Previous studies have investigated the effect of curing time on alginate cross-linking. Herein, we discuss a novel study detailing the effect of IG residence time (IGRT) on the cross-linking of alginate with calcium ions (Ca(2+)) along with water migration (syneresis) and their subsequent impact on the pharmaceutical properties of alginate particles...
January 2, 2017: Carbohydrate Polymers
Lassina Sandotin Coulibaly, Sylvain Kouakou Akpo, Jacques Yvon, Lacina Coulibaly
Environmental pollution by phosphate in developing countries is growing with extensive and diffuse pollution. Solving these problem with intensive technologies is very expensive. Using natural sorbent such as laterite and sandstone could be a solution. The main objective of the study is to evaluate the P-removal efficiency of these materials under various solution properties. Laterite and sandstone used mainly contain very high levels of finely grained iron and aluminum oxy-hydroxides and diverse dioctahedral clays...
December 1, 2016: Journal of Environmental Management
Kranthi Kumar Gangu, Suresh Maddila, Surya Narayana Maddila, Sreekantha B Jonnalagadda
An investigation was conducted into the influence of the amino acids as organic modifiers in the facile synthesis of metal incorporated fluorapatites (FAp) and their properties. The nanostructured Sm doped fluorapatites (Sm-FAp) were prepared by a co-precipitation method using four different amino acids, namely glutamic acid, aspartic acid, glycine and histidine. The materials were characterized by various techniques including X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), high resolution transmission electron microscopy (HR-TEM), N₂-adsorption/desorption isotherm, temperature programmed desorption (TPD) and fluorescence spectrophotometry...
2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Suresh K Kalangi, A Dayakar, D Gangappa, R Sathyavathi, R S Maurya, D Narayana Rao
Despite the existence of chemotherapy, there is no effective cure for leishmaniasis. In the light of recommended therapeutic regimen is attributed for toxicity and development of clinical resistance, exploration of an efficient method of drug delivery could be one of the option in reducing the dosage and toxicity of drugs. This work is aimed in such fashion to study the enhanced antileishmanial activity of miltefosine with silver-nanoparticles (AgNPs) synthesized by using Anethum graveolens (dill) leaf extract as reducing agent...
September 10, 2016: Experimental Parasitology
Pallav A Bulsara, Peter Varlashkin, Jason Dickens, David J Moore, Anthony Vincent Rawlings, Martyn J Clarke
OBJECTIVE: The focus of this communication is the study of phospholipid structured-emulsions whose phase behavior is modified with monoalkyl fatty amphiphiles. Ideally these systems would mimic key physical and structural attributes observed in human stratum corneum (SC)(7) so that they better alleviate xerotic skin conditions. METHODS: Phosphatidylcholine structured emulsions were prepared and their phase behavior modified with monoalkyl fatty amphiphiles. The effect of molecular volume, acyl chain length and head-group interactions was studied using a combination of physical methods...
September 10, 2016: International Journal of Cosmetic Science
Joanna Depciuch, Magdalena Sowa-Kućma, Gabriel Nowak, Dominika Dudek, Marcin Siwek, Krzysztof Styczeń, Magdalena Parlińska-Wojtan
Raman and FTIR (Fourier Transform Infra Red) spectroscopies provide information on the chemical structure of compounds through identification and analysis of functional groups. In the present study, both spectroscopic techniques were used for investigating the phospholipid - protein balance in blood serum of depressed subjects (major depressive disorder and bipolar disorder type I or II) taking also into account their age and gender. The obtained results were compared with those of healthy subjects. The Raman and FTIR (using ATR (Attenuated Total Reflectance) technique), spectra show that a correlation between the level of phospholipids and proteins exists...
November 30, 2016: Journal of Pharmaceutical and Biomedical Analysis
Khadijeh Aghajani, Habib-Allah Tayebi
In this study, the Mesoporous material SBA-15 were synthesized and then, the surface was modified by the surfactant Cetyltrimethylammoniumbromide (CTAB). Finally, the obtained adsorbent was used in order to remove Reactive Red 198 (RR 198) from aqueous solution. Transmission electron microscope (TEM), Fourier transform infra-red spectroscopy (FTIR), Thermogravimetric analysis (TGA), X-ray diffraction (XRD), and BET were utilized for the purpose of examining the structural characteristics of obtained adsorbent...
January 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Annika Parviainen, Juan Manuel Suárez-Grau, Rafael Pérez-López, José Miguel Nieto, Carlos J Garrido, Gema Cobo-Cárdenas
This study explores the environmental impact of metal exposure on humans through detailed phase and structural characterization of gallstones from two environmentally contrasting populations in Huelva Province (SW Spain). A total of 42 gallstone samples, obtained after surgical intervention at the Riotinto Hospital, were studied by powder X-ray diffraction (XRD), Fourier Transformed Infra-Red spectroscopy (FTIR), FTIR-μ-ATR (Attenuated Total Reflection) coupled with an optical microscope, and by Environmental Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (ESEM-EDS), and subsequently classified according to their phase composition and structure...
August 26, 2016: Science of the Total Environment
Houcine Labiadh, Karima Lahbib, Slah Hidouri, Soufiane Touil, Tahar Ben Chaabane
OBJECTIVES: To evaluate the contributions of the some quantum dots in different biological uses in order to valorizes such nanomaterials for further applications. METHODS: Zinc sulfide ZnS nanoparticles were synthesized in aqueous medium at pH constant, the obtained nanoparticles has been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier Transform Infra-red (FTIR) spectroscopies. Zinc sulfide nanoparticles were screened for their antibacterial and antifungal profiling and tested for antioxidant activity using 1,1-diphenyl-2-picrylhydrazyl (DPPH), hydroxyl radical (OH) and hydrogen peroxide (H2O2) scavenging activity, ferric reducing power (FRP) assay and ferrous ion chelating (FIC) methods...
August 2016: Asian Pacific Journal of Tropical Medicine
Opeyemi A Oyewo, Maurice S Onyango, Christian Wolkersdorfer
Transformation of agricultural waste such as banana peels into a valuable sorbent material has been proven effective and efficient in wastewater treatment. Further, transformation into nanosorbent to enhance the removal capacity of actinides (uranium and thorium) from synthetic and real mine water is extensively investigated in this study. The nanosorbent samples before and after adsorption were characterised by X-ray diffraction (XRD), Fourier transform infra-red (FTIR), zetasizer nanoseries and scanning electron microscopy (SEM) while the amount of radioactive substances adsorbed was determined by inductively coupled plasma optical emission spectroscopy...
November 2016: Journal of Environmental Radioactivity
Zeynep A Güçlü, Nazmiye Dönmez, Andrew P Hurt, Nichola J Coleman
OBJECTIVES: The aim of this study was to characterise the new hydrophilic fissure sealant, UltraSeal XT® hydro™ (Ultradent Products, USA), and to investigate its in vitro resistance to microleakage after placement on conventionally acid etched and sequentially lased and acid etched molars. MATERIAL AND METHODS: The sealant was characterised by Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Vickers indentation test...
July 2016: Journal of Applied Oral Science: Revista FOB
Fabien Bibi, Maud Villain, Carole Guillaume, Brice Sorli, Nathalie Gontard
Polymers can be classified as synthetic polymers and natural polymers, and are often characterized by their most typical functions namely their high mechanical resistivity, electrical conductivity and dielectric properties. This bibliography report consists in: (i) Defining the origins of the dielectric properties of natural polymers by reviewing proteins. Despite their complex molecular chains, proteins present several points of interest, particularly, their charge content conferring their electrical and dielectric properties; (ii) Identifying factors influencing the dielectric properties of protein films...
2016: Sensors
Vaida Arcisauskaite, Domagoj Fijan, Mariano Spivak, Coen de Graaf, John E McGrady
Both density functional theory and multi-configurational ab initio (CASPT2) calculations are used to explore the potential energy surface of the hexagonal prismatic cluster [Mn@Si12](+). Unlike isoelectronic Cr@Si12, the ground state is a biradical, with triplet and open-shell singlet states lying very close in energy. The results are discussed in the context of recent experimental studies using infra-red multiple photon dissociation spectroscopy and X-ray MCD spectroscopy.
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Negar Abhari, Ashkan Madadlou, Ali Dini, Ozra Hosseini Naveh
An alkaline starch suspension was charged with citric acid and incubated for different durations (0, 8.5 or 17h). The suspension was then supplemented with caffeine and gelatinized to fabricate hydrogels which were subsequently stored for varying periods (0, 24 or 48h). Charging of the well-dissolved alkaline starch suspension with citric acid decreased at first both the flow index and consistency coefficient (K); however, starch cross-linking over time by the generated trisodium citrate increased the K value...
January 1, 2017: Food Chemistry
Kumari Shweta, Kanakaraju Manupati, Amitava Das, Harit Jha
In the present study we synthesized lignin-tetra ethoxysilane (TEOS) nanocomposite and characterized it using UV-spectroscopy, Fourier Transform Infra-red spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Field Emission-Scanning Electron Microscopy (FE-SEM) and Scanning Electron Microscopy (SEM). XRD spectra and SEM micrographs confirmed a relatively high degree of crystallinity (peaks located at lower angle, 2θ=12° and 2θ=22.0°) and porous nature of nanocomposite. The lignin-TEOS nanocomposites depicted antibacterial activity against the test microorganisms (Pseudomonas aerugenosa MTCC 741, Escherichia coli MTCC 739, Bacillus subtilis MTCC 441 and Staphylococcus aureus MTCC 96) whereas at the same concentration did not show any significant cytotoxicity against various tissue-specific cancer cell lines such as breast cancer: MCF-7, MDA-MB-231, MDA-MB-468, BT-549; lung cancer: A-549; prostate cancer: PC-3, Du-145; as well as primary control cells-Human hepatic stellate cells (HHSteCs)...
November 2016: International Journal of Biological Macromolecules
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