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https://www.readbyqxmd.com/read/28214748/electrochemical-monitoring-of-biointeraction-by-graphene-based-material-modified-pencil-graphite-electrode
#1
Ece Eksin, Erhan Zor, Arzum Erdem, Haluk Bingol
Recently, the low-cost effective biosensing systems based on advanced nanomaterials have received a key attention for development of novel assays for rapid and sequence-specific nucleic acid detection. The electrochemical biosensor based on reduced graphene oxide (rGO) modified disposable pencil graphite electrodes (PGEs) were developed herein for electrochemical monitoring of DNA, and also for monitoring of biointeraction occurred between anticancer drug, Daunorubicin (DNR), and DNA. First, rGO was synthesized chemically and characterized by using UV-Vis, TGA, FT-IR, Raman Spectroscopy and SEM techniques...
February 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28214733/flexible-camphor-diamond-like-carbon-coating-on-polyurethane-to-prevent-candida-albicans-biofilm-growth
#2
Thaisa B Santos, Angela A Vieira, Luciana O Paula, Everton D Santos, Polyana A Radi, Sônia Khouri, Homero S Maciel, Rodrigo S Pessoa, Lucia Vieira
Camphor was incorporated in diamond-like carbon (DLC) films to prevent the Candida albicans yeasts fouling on polyurethane substrates, which is a material commonly used for catheter manufacturing. The camphor:DLC and DLC film for this investigation was produced by plasma enhanced chemical vapor deposition (PECVD), using an apparatus based on the flash evaporation of organic liquid (hexane) containing diluted camphor for camphor:DLC and hexane/methane, mixture for DLC films. The film was deposited at a low temperature of less than 25°C...
February 16, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28214626/green-synthesis-of-a-novel-flower-like-cerium-vanadate-microstructure-for-electrochemical-detection-of-tryptophan-in-food-and-biological-samples
#3
J Vinoth Kumar, R Karthik, Shen-Ming Chen, S Marikkani, A Elangovan, V Muthuraj
In this present investigation, we introduced a novel electrochemical sensor for the detection of tryptophan (TRP) based on green pompoms flower-like cerium vanadate (CeVO4). The flower-like CeVO4 microstructure was prepared by the simple hydrothermal treatment with the assistance of urea for the first time. The as-prepared flower-like CeVO4 microstructure was characterized by various analytical and spectroscopic techniques such as X-ray diffraction, Raman spectroscopy fourier transform infrared spectroscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy studies...
February 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213313/structural-investigation-of-the-cocrystal-formed-between-5-fluorocytosine-and-fumaric-acid-based-on-vibrational-spectroscopic-technique
#4
Yong Du, Qiang Cai, Jiadan Xue, Qi Zhang, Dan Qin
The vibrational spectra of 5-fluorocytosine, fumaric acid and their cocrystal were measured using terahertz time-domain spectroscopy (THz-TDS) and Raman spectroscopy at room temperature. Experimental THz results show that the cocrystal has distinct fingerprint spectra in terahertz region. The absorption peaks observed in the terahertz spectra of the cocrystal were at 0.61 and 0.91THz. These are quite different from corresponding raw starting materials. Raman spectra also show similar results about differences between the cocrystal and corresponding raw starting materials...
February 7, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28213234/dna-wrapped-multi-walled-carbon-nanotube-modified-electrochemical-biosensor-for-the-detection-of-escherichia-coli-from-real-samples
#5
Dilsat Ozkan-Ariksoysal, Yasin Ugur Kayran, Fethiye Ferda Yilmaz, Anton Alexandru Ciucu, Iulia Gabriela David, Vasile David, Mine Hosgor-Limoncu, Mehmet Ozsoz
This paper introduces DNA-wrapped multi-walled carbon nanotube (MWCNT)-modified genosensor for the detection of Escherichia coli (E. coli) from polymerase chain reaction (PCR)-amplified real samples while Staphylococcus aureus (S. aureus) was used to investigate the selectivity of the biosensor. The capture probe specifically recognizing E. coli DNA and it was firstly interacted with MWCNTs for wrapping of single-stranded DNA (ssDNA) onto the nanomaterial. DNA-wrapped MWCNTs were then immobilised on the surface of disposable pencil graphite electrode (PGE) for the detection of DNA hybridization...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213224/ordered-titanium-templates-functionalized-by-gold-films-for-biosensing-applications-towards-non-enzymatic-glucose-detection
#6
Katarzyna Grochowska, Mariusz Szkoda, Jakub Karczewski, Gerard Śliwiński, Katarzyna Siuzdak
Recently, metal nanostructures evoke much interest due to application potential in highly sensitive detectors in biochemistry and medical diagnostics. In this work we report on preparation and characteristics of thin (1-100nm) Au films deposited onto highly ordered structured titanium templates for SERS (Surface Enhanced Raman Spectroscopy) and electrochemical sensing. The Ti templates are formed by selective removal of TiO2 nanotubes out of as-anodized titanium substrate. The surface of the obtained material reproduce precisely the bottom layer of the nanotubes and consists of a uniformly distributed dimples with diameter of ~100nm...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213150/preparation-of-the-go-pd-nanocomposite-and-its-application-for-the-degradation-of-organic-dyes-in-water
#7
Afshan Omidvar, Babak Jaleh, Mahmoud Nasrollahzadeh
A GO/Pd nanocomposite has been successfully synthesized applying a simple method via immobilizing Pd on the surface of the graphene oxide (GO). The GO/Pd nanocomposite was characterized by X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) spectroscopy, Raman, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) techniques. The surface morphology of Pd NPs was viewed by TEM, the particles are spherical with an average particle size of 11nm...
February 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213139/antimycobacterial-antimicrobial-activity-experimental-ft-ir-ft-raman-nmr-uv-vis-dsc-and-dft-transition-state-chemical-reactivity-nbo-nlo
#8
Poonam Rawat, R N Singh, Alok Ranjan, Sartaj Ahmad, Rajat Saxena
As part of a study of pyrrole hydrazone, we have investigated quantum chemical calculations, molecular geometry, relative energy, vibrational properties and antimycobacterial/antimicrobial activity of pyrrole-2-carboxaldehyde isonicotinyl hydrazone (PCINH), by applying the density functional theory (DFT) and Hartree Fock (HF). Good reproduction of experimental values is obtained and with small percentage error in majority of the cases in comparison to theoretical result (DFT). The experimental FT-IR and Raman wavenumbers were compared with the respective theoretical values obtained from DFT calculations and found to agree well...
February 11, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28212025/advances-in-tip-enhanced-near-field-raman-microscopy-using-nanoantennas
#9
Xian Shi, Nicolás Coca-López, Julia Janik, Achim Hartschuh
Tip-enhanced near-field Raman microscopy spectroscopy is a scanning probe technique that is capable of providing vibrational spectroscopic information on single nanoobjects and surfaces at (sub-) nanometer spatial resolution and high detection sensitivity. In this review, we first illustrate the physical principle of optical nanoantennas used in tip-enhanced near-field Raman microscopy and tip-enhanced Raman scattering (TERS) to efficiently couple light to Raman excitations on nanometer length scales. Although the antennas' electric near-field distributions are commonly understood to determine the spatial resolution, recent experiments showing subnanometer-resolved optical images put this understanding into question...
February 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28211901/graphene-oxide-demonstrates-experimental-confirmation-of-abraham-pressure-on-solid-surface
#10
Anirban Kundu, Renu Rani, Kiran S Hazra
The century-old controversy over two contradicting theories on radiation pressure of light proposed by Abraham and Minkowski can come to an end if there is a direct method to measure the surface deformation of the target material due to momentum transfer of photons. Here we have investigated the effect of radiation pressure on the surface morphology of Graphene Oxide (GO) film, experienced due to low power focused laser irradiation. In-depth investigation has been carried out to probe the bending of the GO surface due to radiation pressure by Atomic Force Microscopy (AFM) and subsequently the uniaxial strain induced on the GO film has been probed by Raman Spectroscopy...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211526/stable-optical-trapping-and-sensitive-characterization-of-nanostructures-using-standing-wave-raman-tweezers
#11
Mu-Ying Wu, Dong-Xiong Ling, Lin Ling, William Li, Yong-Qing Li
Optical manipulation and label-free characterization of nanoscale structures open up new possibilities for assembly and control of nanodevices and biomolecules. Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped particle, but is generally less effective for individual nanoparticles. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap with confocal Raman spectroscopy...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211468/long-lasting-solid-lubrication-by-cnt-coated-patterned-surfaces
#12
L Reinert, F Lasserre, C Gachot, P Grützmacher, T MacLucas, N Souza, F Mücklich, S Suarez
The use of lubricants (solid or liquid) is a well-known and suitable approach to reduce friction and wear of moving machine components. Another possibility to influence the tribological behaviour is the formation of well-defined surface topographies such as dimples, bumps or lattice-like pattern geometries by laser surface texturing. However, both methods are limited in their effect: surface textures may be gradually destroyed by plastic deformation and lubricants may be removed from the contact area, therefore no longer properly protecting the contacting surfaces...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28210442/a-portable-fiber-optic-raman-spectrometer-concept-for-evaluation-of-mineral-content-within-enamel-tissue
#13
Anna Akkus, Shan Yang, Renato Roperto, Hathem Mustafa, Sorin Teich, Ozan Akkus
BACKGROUND: Measurement of tooth enamel mineralization using a clinically viable method is essential since variation of mineralization may be used to monitor caries risk or in assessing the effectiveness of remineralization therapy. Fiber optic Raman systems are becoming more affordable and popular in context of biomedical applications. However, the applicability of fiber optic Raman systems for measurement of mineral content within enamel tissue has not been elucidated significantly in the prior literature...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28208767/alternative-cdep-design-to-facilitate-cell-isolation-for-identification-by-raman-spectroscopy
#14
Cynthia Hanson, Elizabeth Vargis
Dielectrophoresis (DEP) uses non-uniform electric fields to cause motion in particles due to the particles' intrinsic properties. As such, DEP is a well-suited label-free means for cell sorting. Of the various methods of implementing DEP, contactless dielectrophoresis (cDEP) is advantageous as it avoids common problems associated with DEP, such as electrode fouling and electrolysis. Unfortunately, cDEP devices can be difficult to fabricate, replicate, and reuse. In addition, the operating parameters are limited by the dielectric breakdown of polydimethylsiloxane (PDMS)...
February 9, 2017: Sensors
https://www.readbyqxmd.com/read/28208285/determining-gender-by-raman-spectroscopy-of-a-bloodstain
#15
Aliaksandra Sikirzhytskaya, Vitali Sikirzhytski, Igor K Lednev
The development of novel methods for forensic science is a constantly growing area of modern analytical chemistry. Raman spectroscopy is one of a few analytical techniques capable of nondestructive and nearly instantaneous analysis of a wide variety of forensic evidence, including body fluid stains, at the scene of a crime. In this proof-of-concept study, Raman microspectroscopy was utilized for gender identification based on dry bloodstains. Raman spectra were acquired in mapping mode from multiple spots on a bloodstain to account for intrinsic sample heterogeneity...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208284/detection-of-papaverine-for-the-possible-identification-of-illicit-opium-cultivation
#16
Rustin Y Mirsafavi, Kristine Lai, Neal D Kline, Augustus W Fountain, Carl D Meinhart, Martin Moskovits
Papaverine is a non-narcotic alkaloid found endemically and uniquely in the latex of the opium poppy. It is normally refined out of the opioids that the latex is typically collected for, hence its presence in a sample is strong prima facie evidence that the carrier from whom the sample was collected is implicated in the mass cultivation of poppies or the collection and handling of their latex. We describe an analysis technique combining surface-enhanced Raman spectroscopy (SERS) with microfluidics for detecting papaverine at low concentrations and show that its SERS spectrum has unique spectroscopic features that allows its detection at low concentrations among typical opioids...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208248/development-of-a-sers-based-rapid-vertical-flow-assay-for-point-of-care-diagnostics
#17
O J R Clarke, B L Goodall, H P Hui, N Vats, C L Brosseau
Point-of-care (POC) diagnostic testing platforms are a growing sector of the healthcare industry as they offer the advantages of rapid provision of results, ease of use, reduced cost, and the ability to link patients to care. While many POC tests are based on chromatographic flow assay technology, this technology suffers from a lack of sensitivity along with limited capacity for multiplexing and quantitative analysis. Several recent reports have begun to investigate the feasibility of coupling chromatographic flow platforms to more advanced read-out technologies which in turn enable on-site acquisition, storage, and transmission of important healthcare metrics...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208191/-urinary-stone-analysis-what-does-the-future-hold-in-store
#18
A Miernik, S Hein, K Wilhelm, M Schoenthaler
Analysis of the composition of a urinary stone is one of the most important steps in the clinical management of patients with urolithiasis. Fourier transform infrared spectroscopy, X-ray diffractometry and petrographic microscopy are the techniques currently used. Novel technical developments in recent years - such as Raman spectroscopy and hyperspectral imaging - have resulted in new approaches to improve urinary stone analysis. In future, table-top portable systems may be used that allow stones to be rapidly examined directly after the operation...
February 16, 2017: Aktuelle Urologie
https://www.readbyqxmd.com/read/28207835/identification-of-plant-cells-in-black-pigments-of-prehistoric-spanish-levantine-rock-art-by-means-of-a-multi-analytical-approach-a-new-method-for-social-identity-materialization-using-cha%C3%A3-ne-op%C3%A3-ratoire
#19
Esther López-Montalvo, Clodoaldo Roldán, Ernestina Badal, Sonia Murcia-Mascarós, Valentín Villaverde
We present a new multi-analytical approach to the characterization of black pigments in Spanish Levantine rock art. This new protocol seeks to identify the raw materials that were used, as well as reconstruct the different technical gestures and decision-making processes involved in the obtaining of these black pigments. For the first of these goals, the pictorial matter of the black figurative motifs documented at the Les Dogues rock art shelter (Ares del Maestre, Castellón, Spain) was characterized through the combination of physicochemical and archeobotanical analyses...
2017: PloS One
https://www.readbyqxmd.com/read/28206980/fast-low-temperature-plasma-reduction-of-monolayer-graphene-oxide-at-atmospheric-pressure
#20
Michal Bodik, Anna Zahoranova, Matej Micusik, Nikola Bugarova, Zdeno Spitalsky, Maria Omastova, Eva Majkova, Matej Jergel, Peter Siffalovic
We report on an ultrafast plasma-based graphene oxide reduction method superior to the conventional vacuum thermal annealing and/or chemical reduction. The method is based on the effect of non-equilibrium atmospheric-pressure plasma generated by the diffuse coplanar surface barrier discharge in proximity of the graphene oxide layer. As the reduction time is of the order of seconds, the presented method is applicable to large-scale production of the reduced graphene oxide layers. The short reduction times are achieved by a high volume power density of plasma which is of the order of 100 W/cm<sup>3</sup>...
February 16, 2017: Nanotechnology
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