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Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

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https://www.readbyqxmd.com/read/28329722/antibacterial-properties-of-amino-acid-functionalized-silver-nanoparticles-decorated-on-graphene-oxide-sheets
#1
Kumudini Chandraker, Rekha Nagwanshi, S K Jadhav, Kallol K Ghosh, Manmohan L Satnami
Graphene oxide (GO) sheets decorated with amino acid L-cysteine (L-cys) functionalized silver nanoparticles (GO-L-cys-Ag) was synthesized by AgNO3, trisodium citrate, and NaBH4. GO-L-cys-Ag nanocomposite was characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectra, ultraviolet-visible (UV-vis) absorption spectra, which demonstrated that a diameter of L-cys-AgNPs compactly deposited on GO. Antibacterial activity tests of GO-L-cys-Ag nanocomposite were carried out using Escherichia coli MTCC 1687 and Staphylococcus aureus MTCC 3160 as model strains of Gram-negative and Gram-positive bacteria, respectively...
March 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28319797/non-enolisable-knoevenagel-condensate-appended-schiff-bases-metal-ii-complexes-spectral-characteristics-dna-binding-and-nuclease-activities
#2
Ammavasi Gubendran, Mookkandi Palsamy Kesavan, Srinivasan Ayyanaar, Liviu Mitu, Periyakaruppan Athappan, Jegathalaprathaban Rajesh
New Schiff base complexes [Cu(L(1))Cl] (1), [Ni(L(1))Cl] (2), [Zn(L(1))Cl] (3), and [Fe(L(2))H2OCl] (4) {L(1)=(4E)-3-(2-hydroxybenzylidene)-4-(2-hydroxyphenylimino)pentan-2-one, L(2)=2,2'-(1E,1'E)-(3-(2-hydroxybenzylidene)-pentane-2,4-diylidene)bis(azan-1-yl-1 idene)diphenol} have been synthesized and characterized by elemental analysis, UV-Vis, IR, FAB-mass, EPR, spectral studies and electrochemical studies, the ligands L(1) &L(2) were characterized by (1)H and (13)C NMR spectra. Complex 1 show a visible spectral d-d band near 600nm and display cyclic voltammetric quasireversible response for the Cu(II)/Cu(I) couple vs Ag/AgCl in DMSO...
March 16, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28315823/corrigendum-to-validated-spectrofluorimetric-methods-for-the-determination-of-apixaban-and-tirofiban-hydrochloride-in-pharmaceutical-formulations-spectrochim-acta-a-mol-biomol-spectrosc-174-2017-326-330
#3
Ramzia I El-Bagary, Ehab F Elkady, Naira A Farid, Nadia F Youssef
No abstract text is available yet for this article.
March 15, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28314203/near-infrared-nir-disrelation-mapping-analysis-for-poly-lactic-acid-nanocomposite
#4
Hideyuki Shinzawa, Junji Mizukado
Near infrared (NIR) imaging data of poly(lactic) acid (PLA) nanocomposite were analysed by disrelation mapping to prove the possible interaction between PLA matrix and montmorillonite-based nanoclay. The basic concept of disrelation mapping can be viewed as a spatial filter based on two-dimensional (2D) correlation function to elucidate specific areas where disrelated variation between intensities occurs. Correlation intensity develops on disrelation map only if spectral intensities at v1 and v2 within the local spatial area vary in a dissimilar manner...
March 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28292702/corrigendum-to-optical-transitions-of-tm3-in-oxyfluoride-glasses-and-compositional-and-thermal-effect-on-upconversion-luminescence-of-tm3-yb3-codoped-oxyfluoride-glasses-spectrochim-acta-a-118-2014-192-198
#5
Li Feng, Yinsu Wu, Zhuo Liu, Tao Guo
No abstract text is available yet for this article.
March 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28315620/3-e-acridin-9-ylmethylidene-amino-1-substituted-thioureas-and-their-biological-activity
#6
Michal Bečka, Mária Vilková, Othman Salem, Jana Kašpárková, Viktor Brabec, Mária Kožurková
This paper describes the synthesis of a novel series of acridine thiosemicarbazones through a two-step reaction between various isothiocyanates and hydrazine followed by treatment with acridin-9-carbaldehyde. The properties of this series of seven new derivatives are studied using NMR and biochemical techniques, and the DNA-binding properties of the compounds are determined using spectrophotometric studies (UV-vis absorption, fluorescence, and circular/linear dichroism) and viscometry. The binding constants K are estimated as being in the range of 2...
March 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28315618/interaction-of-vasicine-with-calf-thymus-dna-molecular-docking-spectroscopic-and-differential-scanning-calorimetric-insights
#7
Sai Murali R S, Sai Siddhardha R S, Rajesh Babu D, Venketesh S, Basavaraju R, Nageswara Rao G
The present study brings out the interaction between vasicine, an alkaloid and Adhatoda vasica Nees with double stranded DNA. The physico-chemical interaction between small molecules and nucleic acids is a major area of focus in screening drugs against various cancers. Molecular probing in our study using Molecular Operating Environment (MOE) has revealed interaction of vasicine with DNA double helix. Here we report the interaction of vasicine with Calf thymus DNA. We present for the first time the results obtained from UV-visible, fluorescence spectroscopic and differential scanning calorimetric techniques that suggest a moderate to strong electrostatic, hydrophobic and van der Waals interactions mediating the DNA binding properties of vasicine, leading to disruption of DNA secondary structure...
March 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28319796/effects-of-stepwise-nitrogen-depletion-on-carotenoid-content-fluorescence-parameters-and-the-cellular-stoichiometry-of-chlorella-vulgaris
#8
Ping Zhang, Zhe Li, Lunhui Lu, Yan Xiao, Jing Liu, Jinsong Guo, Fang Fang
Stressful conditions can stimulate the accumulation of carotenoids in some microalgae. To obtain more knowledge of the stress response, we studied the effects of different N concentrations on unicellular content of carotenoids using Raman spectroscopic technique; cellular stoichiometric changes and the fluorescence parameters of Chlorella vulgaris were concomitantly studied. Initially, we optimized the Raman scattering conditions and demonstrated the feasibility of unicellular carotenoid analysis by Raman spectroscopic technique...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28319795/theoretical-study-of-thieno-thiophene-based-low-band-gap-copolymers-and-substituent-effect-on-the-optoelectronic-properties-of-them
#9
Mehri Javan Khoshkholgh, Mohammad Reza Abolhassani, Farah Marsusi
This paper studies donor-acceptor systems which incorporate benzodithiophene (BDT), benzodifuran (BDF) and benzodipyrrole (BDP) units as the electron-rich monomer with TT unit representing the electron-deficient monomer. This research is based on employing density functional theory (DFT) and time-dependent DFT (TD-DFT). The highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO), HOMO-LUMO gaps and dihedral-angles of these copolymers were calculated using oligomer extrapolation technique and periodic boundary condition (PBC) method...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28301823/-turn-on-fluorescent-probe-detection-of-ca-2-ions-and-applications-to-bioimaging
#10
Huifang Zhang, Caixia Yin, Tao Liu, Yongbin Zhang, Fangjun Huo
Ca(2+) is intracellular divalent cation with the largest concentration variations and involved in many biological phenomena and often acted as a second messenger in signaling pathway. Therefore, the development of probes for specific Ca(2+) detection is of great importance. Herein, a novel turn-on fluorescent probe for the detection of Ca(2+) in MeCN-aqueous medium was designed and synthesized. The probe displayed responses to Ca(2+) with a fluorescence enhancement at 525nm, accompanying with a distinct fluorescence change from nearly colorless to bright yellow-green...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28292703/seed-mediated-grown-silver-nanoparticles-as-a-colorimetric-sensor-for-detection-of-ascorbic-acid
#11
Simindokht Rostami, Ali Mehdinia, Ali Jabbari
A simple and sensitive approach was demonstrated for detection of ascorbic acid (AA) based on seed-mediated growth of silver nanoparticles (Ag NPs). According to the seeding strategy, silver ions existing in the growth solution were reduced to silver atoms on the surface of silver seeds via redox reaction between silver ions and AA. This process -led to appear an absorption band in near 420nm owing to the localized surface plasmon resonance peak of the generated Ag NPs. This change in absorption spectra of Ag NPs caused a change in color of the mixture from colorless to yellow...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28285244/a-simple-ratiometric-fluorescent-sensor-for-fructose-based-on-complexation-of-10-hydroxybenzo-h-quinoline-with-boronic-acid
#12
Huihui Li, Cailing Yang, Xinyue Zhu, Haixia Zhang
A simple ratiometric fluorescent sensor for fructose was presented. It consisted of 10-hydroxybenzo[h]quinoline (HBQ) which showed emission at 572nm and 3-pyridylboronic acid (PDBA) whose complex with HBQ gave emission at 500nm. The reaction of fructose with PDBA inhibited the complexation of HBQ with PDBA, resulting in the change of dual-emission intensity ratio. The sensor well quantified fructose in the range of 0.015-2.5mM with detection limit of 0.005mM. Besides, this sensor exhibited excellent selectivity and was successfully applied to fructose detection in food...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284163/designing-of-an-artificial-light-energy-converter-in-the-form-of-short-chain-dyad-when-combined-with-core-shell-gold-silver-nanocomposites
#13
Gopa Dutta Pal, Somnath Paul, Munmun Bardhan, Asish De, Tapan Ganguly
UV-vis absorption, steady state and time resolved fluorescence and absorption spectroscopic investigations demonstrate that the short chain dyad MNTMA when combined with gold-silver core-shell (Au@Ag) nanocomposite , forms elongated conformers in the excited state whereas for the dyad - Ag (spherical) system the majority of dyads remains in a folded conformation. In the dyad-core-shell nanocomposite system, energy wasting charge recombination rate slows down primarily due to elongated conformation and thus it may be anticipated that this hybrid nanocomposite system may serve as a better light energy conversion device...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284162/sers-substrates-fabricated-using-ceramic-filters-for-the-detection-of-bacteria-eliminating-the-citrate-interference
#14
P A Mosier-Boss, K C Sorensen, R D George, P C Sims, A O'braztsova
It was found that spectra obtained for bacteria on SERS substrates fabricated by filtering citrate-generated Ag nanoparticles (NPs) onto rigid, ceramic filters exhibited peaks due to citrate as well as the bacteria. In many cases the citrate spectrum overwhelmed that of the bacteria. Given the simplicity of the method to prepare these substrates, means of eliminating this citrate interference were explored. It was found that allowing a mixture of bacteria suspension and citrate-generated Ag NPs to incubate prior to filtering onto the ceramic filter eliminated this interference...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284161/identification-of-trace-additives-in-polymer-materials-by-attenuated-total-reflection-fourier-transform-infrared-mapping-coupled-with-multivariate-curve-resolution
#15
Qian Li, Yongjiao Tang, Zhiwei Yan, Pudun Zhang
Although multivariate curve resolution (MCR) has been applied to the analysis of Fourier transform infrared (FTIR) imaging, it is still problematic to determine the number of components. The reported methods at present tend to cause the components of low concentration missed. In this paper a new idea was proposed to resolve this problem. First, MCR calculation was repeated by increasing the number of components sequentially, then each retrieved pure spectrum of as-resulted MCR component was directly compared with a real-world pixel spectrum of the local high concentration in the corresponding MCR map...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284159/portable-raman-spectroscopy-for-an-in-situ-monitoring-the-ripening-of-tomato-solanum-lycopersicum-fruits
#16
Josu Trebolazabala, Maite Maguregui, Héctor Morillas, Alberto de Diego, Juan Manuel Madariaga
Ripening is one of the most important transformations that fruits and vegetables suffer, from an unripe to a ripe stage. In this study, it was followed up and analyzed the variations in the composition of tomato fruits at different ripening stages (green or unripe, orange or middle ripe, red or ripe and brown or overripe). The results obtained from the Raman measurements carried out showed a change in the composition of tomato fruits in the transit from green to brown. The analysis confirmed an increase of carotenoids from an unripe to a ripe stage of these fruits, being lycopene the characteristic carotenoid of the optimum ripe stage...
March 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28314204/stability-speciation-and-spectral-properties-of-npo2-complexes-with-pyridine-monocarboxylates-in-aqueous-solution
#17
Rama Mohana Rao Dumpala, Neetika Rawat, B S Tomar
Neptunyl ion as NpO2(+) is the least reacting and most mobile radioactive species among all the actinides. The picolinic acid used for decontamination is co-disposed along with the radioactive waste. Thus, in long term storage of HLW, there is high possibility of interaction of actinides and long lived fission products with the picolinate and can cause migration. The complexation of NpO2(+) with the three structural isomers of pyridine monocarboxylates provides an insight to explore the role of hetero atom (nitrogen) with respect to key binding moiety (carboxylate)...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28292701/optical-spectroscopy-1-06%C3%AE-m-emission-properties-of-nd-3-doped-phosphate-based-glasses
#18
Rasool Sk Nayab, Sasikala T, Mohan Babu A, Rama Moorthy L, Jayasankar C K
Neodymium doped phosphate based glasses with composition of (P2O5+K2O+Al2O3+CaF2) were prepared. The samples were analysed through differential thermal analysis (DTA), Fourier transform infrared (FTIR), absorption, emission and decay measurements. Judd-Ofelt parameters (Ωλ) have been determined from the spectral intensities of absorption bands in order to calculate the radiative parameters like radiative transition probabilities (AR), radiative lifetime (τR) and branching ratios (βR) for the (4)F3/2→(4)I11/2 laser transition of Nd(3+) ion...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284158/synthesis-spectroscopic-dft-and-in-vitro-biological-studies-of-vanadium-iii-complexes-of-aryldithiocarbonates
#19
Savit Andotra, Sandeep Kumar, Mandeep Kour, Vikas, Chayawan, Vishal Sharma, Sundeep Jaglan, Sushil K Pandey
Vanadium(III) tris(dithiocarbonates), [(ROCS2)3V] (R=o-, m-, p-CH3C6H4 and 4-Cl-3-CH3C6H3) and donor stabilized addition complexes [(ROCS2)2V(Cl)·L] [L=NC5H5 or P(C6H5)3] were synthesized and characterized by elemental analyses, IR, mass, TGA/DTA, SEM magnetic susceptibility and heteronuclear NMR ((1)H, (13)C and (31)P) spectroscopic studies. The cytotoxicity of the complexes was measured in vitro using the cultivated human cell lines. In addition, the antioxidant activities of the ligands and its vanadium complexes were also investigated through their scavenging effect on DPPH radicals...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28284156/composite-cufe1-xsnxo2-p-type-silicon-photodiodes
#20
Abdullah G Al-Sehemi, K Mensah-Darkwa, Ahmed A Al-Ghamdi, M Soylu, R K Gupta, F Yakuphanoglu
CuFe1-xSnxO2 composite thin film/p-type silicon diodes were prepared on substrate by sol-gel method (x=0.00, 0.01, 0.03, 0.05, 0.07). The structure of CuFe1-xSnxO2 composite thin films was studied using XRD analysis and films exhibited amorphous behavior. The elemental compositions and surface morphology of the films were characterized using SEM and EDX. EDX results confirmed the presence of the compositional elements. The optical band gap of CuFe1-xSnxO2 composite thin films was determined using the optic spectra...
March 6, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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