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Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

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https://www.readbyqxmd.com/read/29149695/rheo-optical-near-infrared-nir-spectroscopy-study-of-partially-miscible-polymer-blend-of-polymethyl-methacrylate-pmma-and-polyethylene-glycol-peg
#1
Hideyuki Shinzawa, Junji Mizukado
Tensile deformations of a partially miscible blend of polymethyl methacrylate (PMMA) and polyethylene glycol (PEG) is studied by a rheo-optical characterization near-infrared (NIR) technique to probe deformation behavior during tensile deformation. Sets of NIR spectra of the polymer samples were collected by using an acousto-optic tunable filter (AOTF) NIR spectrometer coupled with a tensile testing machine as an excitation device. While deformations of the samples were readily captured as strain-dependent NIR spectra, the entire feature of the spectra was overwhelmed with the baseline fluctuation induced by the decrease in the sample thickness and subsequent change in the light scattering...
November 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149694/a-high-brightness-probe-of-polymer-nanoparticles-for-biological-imaging
#2
Sirong Zhou, Jiarong Zhu, Yaping Li, Liheng Feng
Conjugated polymer nanoparticles (CPNs) with high brightness in long wavelength region were prepared by the nano-precipitation method. Based on fluorescence resonance energy transfer (FRET) mechanism, the high brightness property of the CPNs was realized by four different emission polymers. Dynamic light scattering (DLS) and scanning electron microscopy (SEM) displayed that the CPNs possessed a spherical structure and an average diameter of ~75nm. Analysis assays showed that the CPNs had excellent biocompatibility, good photostability and low cytotoxicity...
November 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29149693/near-infrared-spectroscopy-based-monitoring-of-extraction-processes-of-raw-material-with-the-help-of-dynamic-predictive%C3%A2-modeling
#3
Haixia Wang, Tongchuan Suo, Xiaolin Wu, Yue Zhang, Chunhua Wang, Heshui Yu, Zheng Li
The control of batch-to-batch quality variations remains a challenging task for pharmaceutical industries, e.g., traditional Chinese medicine (TCM) manufacturing. One difficult problem is to produce pharmaceutical products with consistent quality from raw material of large quality variations. In this paper, an integrated methodology combining the near infrared spectroscopy (NIRS) and dynamic predictive modeling is developed for the monitoring and control of the batch extraction process of licorice. With the spectra data in hand, the initial state of the process is firstly estimated with a state-space model to construct a process monitoring strategy for the early detection of variations induced by the initial process inputs such as raw materials...
November 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29136584/unprecedented-chemosensing-behavior-of-novel-tetra-substituted-benzimidazole-zinc-ii-phthalocynine-for-selective-detection-of-bi-3-ion-synthesis-characterization-and-ros-generation
#4
Azeem Ullah, Faheem Shah, Imran Khan, Muhammad Anwar, Kiramat Shah, Munira Taj Muhammad, Farid Ahmad
In this work, synthesis of novel symmetrical 4-(2-bromo-4-(5-bromo-1H-benzo[d] imidazol-2-yl) phenoxy) tetra substituted zinc phthalocyanine has been reported. The novel benzimidazole zinc phthlocynine compound (3) has been characterized by MALDI-TOF MS, FT-IR, UV-vis, and (1)H NMR spectroscopy. This new compound 3 displayed excellent selectivity towards Bi(3+) ion in the presence of other competitive ions including Ca(2+), Cd(2+), Co(2+) Cu(2+), Fe(3+), Hg(2+), Sn(2+), Mg(2+), Na(+), Ni(2+) and Pb(2+) respectively...
November 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29136585/white-emission-in-single-phase-ba2gd2si4o13-ce-3-eu-2-sm-3-phosphor-for-white-leds
#5
Xiumin Jiang, Yuqian Zhang, Jia Zhang
To develop new white-light-emitting phosphor, a series of Ce(3+)-Eu(2+)-Sm(3+) doped Ba2Gd2Si4O13 (BGS) phosphors were prepared by the solid-state reaction method, and their photoluminescence properties were studied. The Ce(3+) and Eu(2+) single-doped BGS show broad emission bands around in the region of 350-550 and 420-650nm, respectively. By co-doping Ce(3+)-Eu(2+) into BGS, the energy transfer (ET) from Ce(3+) to Eu(2+) is inefficient, which could be due to the competitive absorption between the two activator ions...
November 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29128746/human-serum-albumin-binding-of-certain-antimalarials
#6
Olivera S Marković, Ilija N Cvijetić, Mario V Zlatović, Igor M Opsenica, Jelena M Konstantinović, Nataša V Terzić Jovanović, Bogdan A Šolaja, Tatjana Ž Verbić
Interactions between eight in-house synthesized aminoquinolines, along with well-known chloroquine, and human serum albumin (HSA) have been studied by fluorescence spectroscopy. The synthesized aminoquinolines, despite being structurally diverse, were found to be very potent antimalarials. Fluorescence measurements indicate that three compounds having additional thiophene or benzothiophene substructure bind more strongly to HSA than other studied compounds. Competitive binding experiments indicate that these three compounds bind significantly stronger to warfarin compared to diazepam binding site...
November 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29128745/a-new-method-for-determination-of-cocamidopropyl-betaine-synthesized-from-coconut-oil-through-spectral-shift-of-eriochrome-black-t
#7
Ali Gholami, Mahshid Golestaneh, Zeinab Andalib
Cocamidopropyl betaine (CAPB) is a zwitterionic surfactant that is synthesized using coconut oil and usually supplied in form of an aqueous solution with 25-37% w/w. In this study, a novel method based on UV-visible spectroscopy is developed for an accurate determination of CAPB synthesized from coconut oil. Eriochrome Black T (EBT) as a specific color indicator was added to CAPB and a red shift and color change were observed. This shift leads in increasing wavelength selectivity of the method. The change in the color intensity depends on the concentration of CAPB...
November 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29145059/binding-of-naringin-and-naringenin-with-hen-egg-white-lysozyme-a-spectroscopic-investigation-and-molecular-docking-study
#8
Sourav Das, Pooja Ghosh, Sudipta Koley, Atanu Singha Roy
The interactions of naringenin (NG) and naringin (NR) with Hen Egg White Lysozyme (HEWL) in aqueous medium have been investigated using UV-vis spectroscopy, steady-state fluorescence, circular dichroism (CD), Fourier Transform infrared spectroscopy (FT-IR) and molecular docking analyses. Both NG and NR can quench the intrinsic fluorescence of HEWL via static quenching mechanism. At 300K, the value of binding constant (Kb) of HEWL-NG complex (5.596±0.063×10(4)M(-1)) was found to be greater than that of HEWL-NR complex (3...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29136586/generalised-two-dimensional-correlation-analysis-of-the-co-ce-and-pd-mixed-oxide-catalytic-systems-for-methane-combustion-using-in-situ-infrared-spectroscopy
#9
Damian K Chlebda, Przemysław J Jodłowski, Roman J Jędrzejczyk, Joanna Łojewska
The process of methane combustion over the surface of a catalyst is still not fully understood. The identification of the reaction path and the intermediates created during catalysis is crucial for understanding the transformation of methane molecules. Two-dimensional (2D) correlation spectroscopy was engaged as a tool for the quantitative analysis of a series of temperature-dependent infrared spectra registered in situ during methane combustion. The prepared samples of catalysts were based on a Co, Pd and Ce mixed oxide adsorbed on an aluminium oxide layer deposited on kanthal steel...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29136582/colorimetric-detection-of-melamine-in-milk-based-on-triton-x-100-modified-gold-nanoparticles-and-its-paper-based-application
#10
Nan Gao, Pengcheng Huang, Fangying Wu
In this study, we have developed a method for rapid, highly efficient and selective detection of melamine. The negatively charged citrate ions form an electrostatic layer on gold nanoparticles (AuNPs) and keep the NPs dispersed and stable. When citrate-capped AuNPs were further modified with Triton X-100, it stabilized the AuNPs against the conditions of high ionic strength and a broad pH range. However, the addition of melamine caused the destabilization and aggregation of NPs. This may be attributed to the interaction between melamine and the AuNPs through the ligand exchange with citrate ions on the surface of AuNPs leading Triton X-100 to be removed...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29132053/tddft-study-on-excited-state-intramolecular-proton-transfer-mechanism-in-2-amino-3-2-benzazolyl-quinolines
#11
Xueli Jia, Chaozheng Li, Donglin Li, Yufang Liu
The intramolecular proton transfer reaction of the 2-amino-3-(2'-benzoxazolyl)-quinoline (ABO) and 2-amino-3-(2'-benzothiazolyl)-quinoline (ABT) molecules in both S0 and S1 states at B3LYP/6-311++G(d,p) level in ethanol solvent have been studied to reveal the deactivation mechanism of the tautomers of the two molecules from the S1 state to the S0 state. The results show that the tautomers of ABO and ABT molecules may return to the S0 state by emitting fluorescence. In addition, the bond lengths, angles and infrared spectra are analyzed to confirm the hydrogen bonds strengthened upon photoexcitation, which can facilitate the proton transfer process...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29127827/spectrophotometric-and-spectrofluorimetric-methods-for-determination-of-certain-biologically-active-phenolic-drugs-in-their-bulk-powders-and-different-pharmaceutical-formulations
#12
Mahmoud A Omar, Kalid M Badr El-Din, Hesham Salem, Osama H Abdelmageed
Two simple and sensitive spectrophotometric and spectrofluorimetric methods for the determination of terbutaline sulfate, fenoterol hydrobromide, etilefrine hydrochloride, isoxsuprine hydrochloride, ethamsylate, doxycycline hyclate have been developed. Both methods were based on the oxidation of the cited drugs with cerium (IV) in acid medium. The spectrophotometric method was based on measurement of the absorbance difference (ΔA), which represents the excess cerium (IV), at 317nm for each drug. On the other hand, the spectrofluorimetric method was based on measurement of the fluorescent of the produced cerium (III) at emission wavelength 354nm (λexcitation=255nm) for the concentrations studied for each drug...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29136583/heterocyclic-schiff-bases-as-non-toxic-antioxidants-solvent-effect-structure-activity-relationship-and-mechanism-of-action
#13
Angamaly Antony Shanty, Puzhavoorparambil Velayudhan Mohanan
Phenolic heterocyclic imine based Schiff bases from Thiophene-2-carboxaldehyde and Pyrrole-2-carboxaldehyde were synthesized and characterized as novel antioxidants. The solvent effects of these Schiff bases were determined and compared with standard antioxidants, BHA employing DPPH assay and ABTS assay. Fixed reaction time and Steady state measurement were used for study. IC50 and EC50 were calculated. Structure-activity relationship revealed that the electron donating group in the phenolic ring increases the activity where as the electron withdrawing moiety decreases the activity...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29133132/application-of-dyes-extracted-from-alternanthera-dentata-leaves-and-musa-acuminata-bracts-as-natural-sensitizers-for-dye-sensitized-solar-cells
#14
Mahmoud A M Al-Alwani, Norasikin A Ludin, Abu Bakar Mohamad, Abd Amir H Kadhum, Abduljabbar Mukhlus
The natural dyes anthocyanin and chlorophyll were extracted from Musa acuminata bracts and Alternanthera dentata leaves, respectively. The dyes were then applied as sensitizers in TiO2-based dye-sensitized solar cells (DSSCs). The ethanol extracts of the dyes had maximum absorbance. High dye yields were obtained under extraction temperatures of 70 to 80°C, and the optimal extraction temperature was approximately 80°C. Moreover, dye concentration sharply decreased under extraction temperatures that exceeded 80°C...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29133130/far-ultraviolet-spectral-changes-of-titanium-dioxide-with-gold-nanoparticles-by-ultraviolet-and-visible-light
#15
Ichiro Tanabe, Yuji Kurawaki
Attenuated total reflectance spectra including the far-ultraviolet (FUV, ≤200nm) region of titanium dioxide (TiO2) with and without gold (Au) nanoparticles were measured. A newly developed external light-irradiation system enabled to observe spectral changes of TiO2 with Au nanoparticles upon light irradiations. Absorption in the FUV region decreased and increased by the irradiation with ultraviolet and visible light, respectively. These spectral changes may reflect photo-induced electron transfer from TiO2 to Au nanoparticles under ultraviolet light and from Au nanoparticles to TiO2 under visible light, respectively...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29128748/supramolecular-interactions-of-oxidative-stress-biomarker-glutathione-with-fluorone-black
#16
Maria Hepel, Magdalena Stobiecka
Oxidative stress biomarkers, including glutathione (GSH) and related compounds, are involved in a variety of interactions enabling redox potential maintenance in living cells and protection against radicals. Since the oxidative stress is promoting and, in many cases, inducing serious illnesses, monitoring of GSH levels can aid in diagnostics and disease prevention. Herein, we report on the discovery of the formation of a supramolecular ensemble of GSH with fluorone black (9-phenyl fluorone, FB) which is optically active and enables sensitive determination of GSH by resonance elastic light scattering (RELS)...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29126012/a-highly-selective-chemiluminescent-probe-for-the-detection-of-chromium-vi
#17
Yan Jin, Yonghua Sun, Chongying Li, Chao Yang
In present work, rhodamine B hydrazide and rhodamine 6G hydrazide were synthesized and the chemiluminescence performance has been investigated. Based on the chemiluminescence of rhodamine 6G hydrazide‑chromium(VI), a selective and sensitive method for the direct detection of chromium(VI) was developed. The chemiluminescence intensity was linearly related to the concentration of chromium(VI) in the range of 2.60×10(-8)-8.00×10(-6)mol/L with a correlation coefficient of r=0.998 and a detection limit of 1...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29126009/characteristics-and-origin-of-agates-from-p%C3%A5-%C3%A3-czki-g%C3%A3-rne-lower-silesia-poland-a-combined-microscopic-micro-raman-and-cathodoluminescence-study
#18
Magdalena Dumańska-Słowik, Tomasz Powolny, Magdalena Sikorska-Jaworowska, Adam Gaweł, Lucyna Kogut, Krzysztof Poloński
Agates from Płóczki Górne hosted by Permian basaltic rocks are predominantly made of length-fast chalcedony, and subordinately megaquartz and quartzine. Moganite occurs in traces mainly in transparent, outer, darker regions of white-grey coloured agates. Silica matrix of agates comprises a wide variety of solid inclusions represented by celadonite, plagioclases, hematite, goethite, barite, calcite, heulandite-clinoptyloite, nontronite-saponite, and Mn-dioxides (ramsdellite). Mineral phases are locally accompanied by black aggregations of carbonaceous matter, which gives a Raman signature of disordered carbon...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29126004/photovoltaic-characteristics-of-natural-light-harvesting-dye-sensitized-solar-cells
#19
H S Hafez, S S Shenouda, M Fadel
In this work of research, anthocyanin as a natural dye obtained from raspberry fruits, was used and tested as a photon harvesting/electron donating dye in titanium dioxide nanoparticle-based DSSCs. A working photoelectrode made from TiO2 nanoparticles with an average particle size (10-40nm) that is coated on Florine doped tin-oxide substrate, was prepared via a simple and low cost hydrothermal method. A detailed structural and morphological analysis of the TiO2 photoactive electrode was investigated by X-ray diffraction (XRD), diffuse reflectance spectrometer, transmission electron microscope (TEM) and scanning electron microscope (SEM)...
November 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29128747/spectroscopy-and-energy-transfer-in-lead-borate-glasses-doubly-doped-with-tm-3-and-dy-3-ions
#20
Agata Górny, Marta Sołtys, Joanna Pisarska, Wojciech A Pisarski
Lead borate glasses singly and doubly doped with Tm(3+) and Dy(3+) were prepared by traditional melt-quenching technique. The emission spectra of rare earths in studied glass systems were registered under different excitation wavelengths. The observed emission bands are located in the visible spectral region. They correspond to (1)D2→(3)F4 (blue) and (1)G4→(3)H6 (blue) transitions of Tm(3+) as well as (4)F9/2→(6)H15/2 (blue), (4)F9/2→(6)H13/2 (yellow) and (4)F9/2→(6)H11/2 (red) transitions of Dy(3+)...
November 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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