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Raman spectroscopy

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https://www.readbyqxmd.com/read/29140368/in-vitro-bioactivity-test-of-real-dental-implants-according-to-iso-23317
#1
Martina Kolafová, Jan Šťovíček, Jakub Strnad, Josef Zemek, Jiři Dybal
PURPOSE: The goal of this study was to compare the in vitro bioactivity in simulated body fluid (SBF) of commercially available dental implants. MATERIALS AND METHODS: Bioactivity, according to ISO 23317, of commercially available dental implants with various surface modifications (BIO-surface, SLA, SLActive, TiUnite, and OsseoSpeed) was tested in SBF for 1 and 3 weeks. Surface characterizations, especially calcium and phosphorus surface content before and after the immersion in SBF, were performed...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29140342/fiber-format-dual-comb-coherent-raman-spectrometer
#2
Nicola Coluccelli, Christopher R Howle, Kenneth McEwan, Yuchen Wang, Toney Teddy Fernandez, Alessio Gambetta, Paolo Laporta, Gianluca Galzerano
We demonstrate a fiber-format system for dual-comb coherent anti-Stokes Raman scattering spectroscopy. The system is based on two ytterbium fiber (Yb) femtosecond lasers at repetition frequencies of 94 MHz, a Yb amplifier, and a photonic crystal fiber for spectral broadening and generation of pulses with a central wavelength of 1040 nm and durations in the sub-20-fs regime. We observed Raman spectra of acetonitrile and ethyl acetate with spectral coverage from 100 to 1300  cm(-1), resolution of 8  cm(-1), and a signal-to-noise ratio of around 100, when averaging over 10 acquisitions...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140287/interaction-between-diethyldithiocarbamate-and-cu-ii-on-gold-in-non-cyanide-wastewater
#3
Nguyễn Hoàng Ly, Thanh Danh Nguyen, Kyung-Duk Zoh, Sang-Woo Joo
A surface-enhanced Raman scattering (SERS) detection method for environmental copper ions (Cu(2+)) was developed according to the vibrational spectral change of diethyldithiocarbamate (DDTC) on gold nanoparticles (AuNPs). The ultraviolet-visible (UV-Vis) absorption spectra indicated that DDTC formed a complex with Cu(2+), showing a prominent peak at ~450 nm. We found Raman spectral changes in DDTC from ~1490 cm(-1) to ~1504 cm(-1) on AuNPs at a high concentration of Cu(2+) above 1 μM. The other ions of Zn(2+), Pb(2+), Ni(2+), NH₄⁺, Mn(2+), Mg(2+), K⁺, Hg(2+), Fe(2+), Fe(3+), Cr(3+), Co(2+), Cd(2+), and Ca(2+) did not produce such spectral changes, even after they reacted with DDTC...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29140085/electronic-structure-of-anilinopyridinate-supported-ru2-5-paddlewheel-compounds
#4
Amanda R Corcos, Michael D Roy, Michelle M Killian, Stephanie Dillon, Thomas C Brunold, John F Berry
The electronic structures of the diruthenium compounds Ru2(ap)4Cl (1, ap = 2-anilinopyridinate) and Ru2(ap)4OTf (2) were investigated with UV-vis, resonance Raman, and magnetic circular dichroism (MCD) spectroscopies; SQUID magnetometry; and density functional theory (DFT) calculations. Both compounds have quartet spin ground states with large axial zero-field splitting of ∼60 cm(-1) that is characteristic of Ru2(5+) compounds having a (π*, δ*)(3) electron configuration and a Ru-Ru bond order of ∼2.5...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29139483/surface-enhanced-raman-spectroscopy-bottlenecks-and-future-directions
#5
Rajapandiyan Panneerselvam, Guo-Kun Liu, Yao-Hui Wang, Jun-Yang Liu, Song-Yuan Ding, Jian-Feng Li, De-Yin Wu, Zhong-Qun Tian
In this feature article, we discuss in detail developmental bottleneck issues in Raman spectroscopy in its early stages and surface-enhanced Raman spectroscopy (SERS) in the past four decades. We divide SERS research into two different directions with different targets. Fundamental research is extending the limits of SERS to single-molecule, sub-nanometer resolution and femtosecond processes. In contrast, practical research is expanding the range of applications with the aim of providing versatile analytical tools for surface, materials, life, environmental, forensic and food sciences and also commercial instruments for use in daily life...
November 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29139244/raman-exfoliative-cytology-for-oral-precancer-diagnosis
#6
Aditi Sahu, Poonam Gera, Venkatesh Pai, Abhishek Dubey, Gunjan Tyagi, Mandavi Waghmare, Sandeep Pagare, Manoj Mahimkar, C Murali Krishna
Oral premalignant lesions (OPLs) such as leukoplakia, erythroplakia, and oral submucous fibrosis, often precede oral cancer. Screening and management of these premalignant conditions can improve prognosis. Raman spectroscopy has previously demonstrated potential in the diagnosis of oral premalignant conditions (in vivo), detected viral infection, and identified cancer in both oral and cervical exfoliated cells (ex vivo). The potential of Raman exfoliative cytology (REC) in identifying premalignant conditions was investigated...
November 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29138762/identifying-cu-ii-amyloid-peptide-binding-intermediates-in-the-early-stages-of-aggregation-by-resonance-raman-spectroscopy-a-simulation-study
#7
Hao Ren, Yu Zhang, Sibei Guo, Na Lin, Li Deng, Tongtao Yue, Fang Huang
The aggregation of amyloid beta (Aβ) peptides plays a crucial role in the pathology and etiology of Alzheimer's disease. Experimental evidence shows that copper ion is an aggregation-prone species with the ability to coordinately bind to Aβ and further induce the formation of neurotoxic Aβ oligomers. However, the detailed structures of Cu(ii)-Aβ complexes have not been illustrated, and the kinetics and dynamics of the Cu(ii) binding are not well understood. Two Cu(ii)-Aβ complexes have been proposed to exist under physiological conditions, and another two might exist at higher pH values...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29137773/ultrasonic-assisted-synthesis-of-batio3-nanoparticles-at-25%C3%A2-%C3%A2-c-and-atmospheric-pressure
#8
Songkot Utara, Sitchai Hunpratub
Barium titanate (BaTiO3) nanoparticles were successfully synthesized via a sonochemical method (25 kHz) at a constant temperature of 25 °C and atmospheric pressure without a calcination step. Barium hydroxide Ba(OH)2 and diisopropoxytitanium bis(acetylacetonate) (C12H28O6Ti) were used as the starting materials. The effects of the concentration of NaOH used and ultrasonic reaction time were investigated. The phase composition, functional groups and morphology of synthesized powders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Fourier transform Raman spectroscopy (FT-Raman) and transmission electron microscopy (TEM)...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137752/microwave-and-ultrasound-assisted-synthesis-of-poly-vinyl-chloride-riboflavin-modified-mwcnts-examination-of-thermal-mechanical-and-morphology-properties
#9
Amir Abdolmaleki, Shadpour Mallakpour, Faezeh Azimi
This study focused on the preparation and investigation of physicochemical features of new poly(vinyl chloride) (PVC) nanocomposites (NCs) including different amounts of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) functionalized with riboflavin (RIB). Firstly, to increase the hydrophilicity of MWCNTs, the surface of them was functionalized by incorporating and formation of ester groups with RIB as a low cost and environmentally friendly biomolecule through ultrasound and microwave irradiations...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137732/ultrasound-assisted-biosynthesis-of-cuo-nps-using-brown-alga-cystoseira-trinodis-characterization-photocatalytic-aop-dpph-scavenging-and-antibacterial-investigations
#10
Haidong Gu, Xiao Chen, Feng Chen, Xing Zhou, Zohreh Parsaee
This contribution reports the biosynthesis of CuO NPs via ultrasound method using the Cystoseira trinodis extracts as an eco friendly and time saving process. The characterization of cupric oxide NPs was performed using XRD, FE-SEM, EDX, TEM, AFM, photoluminescence, UV-Vis, Raman and FT-IR spectroscopy investigations. SEM images show the spherical structure with the average crystallite size 6nm to 7.8nm of CuO. XRD analysis approved the formation of pure monoclinic crystallite structures of CuO NPs. These observations were confirmed by TEM analysis...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137201/review-on-sers-of-bacteria
#11
REVIEW
Pamela A Mosier-Boss
Surface enhanced Raman spectroscopy (SERS) has been widely used for chemical detection. Moreover, the inherent richness of the spectral data has made SERS attractive for use in detecting biological materials, including bacteria. This review discusses methods that have been used to obtain SERS spectra of bacteria. The kinds of SERS substrates employed to obtain SERS spectra are discussed as well as how bacteria interact with silver and gold nanoparticles. The roll of capping agents on Ag/Au NPs in obtaining SERS spectra is examined as well as the interpretation of the spectral data...
November 13, 2017: Biosensors
https://www.readbyqxmd.com/read/29137133/reduced-graphene-oxide-on-nickel-foam-for-supercapacitor-electrodes
#12
Uma Ramabadran, Gillian Ryan, Xuan Zhou, Susan Farhat, Felicia Manciu, Yigang Tong, Ryan Ayler, Graham Garner
The focus of this paper is the investigation of reduced graphene oxide (GO)/nickel foam (RGON) samples for use as supercapacitor electrodes. Nickel foam samples were soaked in a GO suspension and dried before being subjected to two different methods to remove oxygen. Atmospheric pressure annealed (APA) samples were treated with a varying number (10-18) of nitrogen plasma jet scans, where sample temperatures did not exceed 280 °C. Furnace annealed (FA) samples were processed in an atmosphere of hydrogen and argon, at temperatures ranging from 600 °C to 900 °C...
November 11, 2017: Materials
https://www.readbyqxmd.com/read/29136913/direct-detection-of-fluoride-ions-in-aquatic-samples-by-surface-enhanced-raman-scattering
#13
Xueliang Li, Ming Zhang, Yue Wang, Xiaolei Wang, Hao Ma, Peng Li, Wei Song, Xiao Xia Han, Bing Zhao
Given the strong hydration propensity of fluoride ions, it is difficult to detect fluoride, especially inorganic fluoride, in aqueous samples. Resolving the issue of fluoride detection in aqueous samples is a scientific undertaking of great practical significance. Herein, we propose a new method for the sensitive and selective detection of fluoride in aqueous samples without the addition of organic solvents. The method involves surface-enhanced Raman spectroscopy using 1,4-diketo-3,6-diphenylpyrrolo[3,4-c]pyrrole (DPP) compounds and Ag nanoparticles...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136881/monitoring-of-tablet-coating-processes-with-colored-coatings
#14
Shirin Barimani, Peter Kleinebudde
Endpoints of coating processes for colored tablets were determined using in-line Raman spectroscopy. Coatings were performed with six commercially available formulations of pink, yellow, red, beige, green and blue color. The coatings were comprising pigments and/or dyes, some causing fluorescence and interfering the Raman signal. Using non-contact optics, a Raman probe was used as process analytical technology (PAT) tool, and acquired spectra were correlated to the sprayed mass of aqueous coating suspension...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136880/enhanced-electrochemical-response-of-carbon-quantum-dot-modified-electrodes
#15
M Algarra, A González-Calabuig, K Radotić, D Mutavdzic, C O Ania, J M Lázaro-Martínez, J Jiménez-Jiménez, E Rodríguez-Castellón, M Del Valle
A glassy carbon electrode (GCE) was surface-modified with carbon quantum dots (CQDs) and applied for the effective enhancement of the electrochemical signal for dopamine and uric acid determination. CQDs were prepared from graphite by a green modification of the Hummers method. They were characterized by FTIR-ATR, XPS, solid-state NMR, fluorescence and Raman spectroscopies. TPD-MS analysis was applied to characterize the functionalization of the surface. The CQDs were assembled on the glassy carbon electrode by adsorption because of the large number of carboxy groups on their surface warrants effective adsorption...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136847/nitrogen-doped-carbon-nanotubes-decorated-poly-l-cysteine-as-a-novel-ultrasensitive-electrochemical-sensor-for-simultaneous-determination-of-theophylline-and-caffeine
#16
Yingzi Wang, Yaping Ding, Li Li, Ping Hu
In present study, a novel and facile electrochemical sensor based on glassy carbon electrode (GCE) modified with nitrogen-doped carbon nanotubes (N-CNT) decorated with poly (L-Cysteine) (PLCY) were fabricated and applied for the simultaneous voltammetric determination of theophylline (THEO) and caffeine (CAF). The morphology and structure of multilayer film modified on the surface of glassy carbon electrode were investigated successfully by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) and Raman Spectroscopy...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136844/physicochemical-characterization-of-lavandula-spp-honey-with-ft-raman-spectroscopy
#17
Ofélia Anjos, António J A Santos, Vasco Paixão, Letícia M Estevinho
This study aimed to evaluate the potential of FT-Raman spectroscopy in the prediction of the chemical composition of Lavandula spp. monofloral honey. Partial Least Squares (PLS) regression models were performed for the quantitative estimation and the results were correlated with those obtained using reference methods. Good calibration models were obtained for electrical conductivity, ash, total acidity, pH, reducing sugars, hydroxymethylfurfural (HMF), proline, diastase index, apparent sucrose, total flavonoids content and total phenol content...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136829/au-pt-bimetallic-nanoparticles-decorated-on-sulfonated-nitrogen-sulfur-co-doped-graphene-for-simultaneous-determination-of-dopamine-and-uric-acid
#18
Kangning Zhang, Xiaoling Chen, Zhuang Li, Yan Wang, Sen Sun, Li'na Wang, Tong Guo, Dongxia Zhang, Zhonghua Xue, Xibin Zhou, Xiaoquan Lu
In this work, a novel nanohybrid (AuPtNPs/S-NS-GR) of well-defined Au-Pt bimetallic nanoparticles (Au-PtNPs) decorated on sulfonated nitrogen sulfur co-doped graphene (S-NS-GR) was developed. Firstly, nitrogen sulfur co-doped graphene (NS-GR) was synthesized by one-step thermal annealing method. Secondly, phenyl SO3H- group was introduced onto the surface of NS-GR via diazotization reaction, which could provide more binding sites for the formation of metal nanoparticles. Finally, Au-Pt bimetallic nanoparticles were anchored on the surface of S-NS-GR by using electrochemical deposition...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136825/determining-moisture-content-in-pasta-by-vibrational-spectroscopy
#19
Tomasz Czaja, Ewelina Kuzawińska, Aldona Sobota, Roman Szostak
Pasta aside from bread is the most consumed cereal-based product in the world. Its taste and cooking ease makes it the basis of many cuisines. The pasta dough formed by mixing flour and water is extruded through an extrusion die to mould the appropriate pasta form and is dried to obtain a stable product. The concentration of moisture in the pasta dough is a one of key parameters determining the final quality of the product. Monitoring the moisture content of pasta after extrusion is also critically important...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136792/comparative-performances-of-a-bare-graphite-polyurethane-composite-electrode-unmodified-and-modified-with-graphene-and-carbon-nanotubes-in-the-electrochemical-determination-of-escitalopram
#20
Marina Baccarin, Priscila Cervini, Eder Tadeu Gomes Cavalheiro
A bare composite graphite-polyurethane electrode (EGPU) and two other modified with graphene (EGPU-GR) and functionalized multi-walled carbon nanotubes (EGPU-CNTs) were prepared and compared regarding their voltammetric response to escitalopran (EST). The modifiers were characterized by Raman spectroscopy and the resulting electrode materials by contact angle measurements with a hydrophilicity character in the ascending order for the composites: GPU > GPU-GR > GPU-CNTs and scanning electron microscopy (SEM)...
February 1, 2018: Talanta
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