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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
#1
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/28213260/the-fabrication-of-carbon-nanotubes-array-based-electrochemical-chiral-sensor-by-electrosynthesis
#2
Hong Zhu, Fengxia Chang, Zhiwei Zhu
How to align the single-walled carbon nanotubes (SWCNTs) onto the electrode vertically and to control their density and orientation are still a major challenge. Theoretically, properly selected chiral SWCNTs can discriminate enantiomers through their different dielectric response to the adsorption of chiral species, few reports can confirm this theoretic model. Herein, we presented a new strategy to fabricate SWCNTs array-based electrochemical chiral sensor. Carboxylated chiral SWCNTs were vertically attached to the oxidized glass carbon electrode with ethylenediamine as a linker by electrosynthesis...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213234/dna-wrapped-multi-walled-carbon-nanotube-modified-electrochemical-biosensor-for-the-detection-of-escherichia-coli-from-real-samples
#3
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
#4
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/28213212/a-sensitive-bisphenol-a-voltammetric-sensor-relying-on-aupd-nanoparticles-graphene-composites-modified-glassy-carbon-electrode
#5
Bingyuan Su, Huilin Shao, Na Li, Xiaomei Chen, Zhixiong Cai, Xi Chen
In this work, a sensitive bisphenol A (BPA) electrochemical sensor was assembled using a surfactant-free AuPd nanoparticles-loaded graphene nanosheets (AuPdNPs/GNs) modified electrode. The AuPdNPs monodispersed on GNs were successfully prepared by the spontaneous redox reaction between bimetallic precursors and GNs. Because no surfactant or halide ions were involved in the proposed synthesis, the prepared composite was enabled to directly modify a glassy carbon electrode without any pre-treatments. Moreover, due to the synergetic effect of Au and Pd, AuPdNPs/GNs displayed high electrochemical activity with well-defined voltammetric peaks of BPA oxidation and lower overpotential compared with monometallic PdNPs and AuNPs supported GNs...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212326/electrochemical-oxidation-of-l-selenomethionine-and-se-methylseleno-l-cysteine-at-a-thiol-compound-modified-gold-electrode-its-application-in-a-flow-through-voltammetric-sensor
#6
Lai-Hao Wang, Yu-Han Zhang
A flow-electrolytic cell that consists of a bare gold wire or of different thiol-compound-modified gold electrodes (such as 2,4-thiazolidinedione, 2-mercapto-5-thiazoline, 2-mercaptothiazoline, l-cysteine, thioglycolic acid) was designed to be used in a voltammetric detector to identify l-selenomethionine and Se-methylseleno-l-cysteine using high-performance liquid chromatography. Both l-selenomethionine and Se-methylseleno-l-cysteine are more efficiently electrochemically oxidized on a thiol/gold than on a bare gold electrode...
February 16, 2017: Sensors
https://www.readbyqxmd.com/read/28211363/nanowire-networks-and-hollow-nanospheres-of-ag-au-bimetallic-alloys-at-room-temperature
#7
R Britto Hurtado, M Cortez-Valadez, H Arizpe-Chávez, N S Flores-Lopez, Ramón A B Álvarez, M Flores-Acosta
Due to their physicochemical properties, metallic nanoalloys have potential applications in biomedicine, electrocatalysis and electrochemical sensors, among many other fields. New alternative procedures have emerged in order to reduce production costs and the use of toxic substances. In this study we present a novel low-toxicity synthesis method for the fabrication of nanowire networks (NWNs) and Ag-Au hollow nanospheres. The synthesis process is performed at room temperature without any sophisticated equipment, such as special cameras or furnaces, etc...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28208250/simultaneous-voltammetric-determination-of-acetaminophen-and-isoniazid-hepatotoxicity-related-drugs-utilizing-bismuth-oxide-nanorod-modified-screen-printed-electrochemical-sensing-platforms
#8
Bahaa G Mahmoud, Mohamed Khairy, Farouk A Rashwan, Craig E Banks
To overcome the recent outbreaks of hepatotoxicity-related drugs, a new analytical tool for the continuously determination of these drugs in human fluids is required. Electrochemical-based analytical methods offer an effective, rapid, and simple tool for on-site determination of various organic and inorganic species. However, the design of a sensitive, selective, stable, and reproducible sensor is still a major challenge. In the present manuscript, a facile, one-pot hydrothermal synthesis of bismuth oxide (Bi2O2...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28206749/graphene-intermetallic-ptpb-nanoplates-composites-for-boosting-electrochemical-detection-of-h2o2-released-from-cells
#9
Yingjun Sun, Mingchuan Luo, Xiangxi Meng, Jing Xiang, Lei Wang, Qiushi Ren, Shaojun Guo
Rational design and construction of electrocatalytic nanomaterials is vital for improving the sensitivity and selectivity of non-enzymatic electrochemical sensors. Here, we report a novel graphene supported intermetallic PtPb nanoplates (PtPb/G) nanocomposite as enhanced electrochemical sensing platform for high-sensitivity detection of H2O2 in neutral solution and also released from the cells. The intermetallic PtPb nanoplates are first synthesized via a simple wet-chemistry process, and subsequently assembled on graphene via a solution-phase self-assembly approach...
February 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28205102/a-simple-portable-electrochemical-biosensor-to-screen-shellfish-for-vibrio-parahaemolyticus
#10
Noordiana Nordin, Nor Azah Yusof, Jaafar Abdullah, Son Radu, Roozbeh Hushiarian
An earlier electrochemical mechanism of DNA detection was adapted and specified for the detection of Vibrio parahaemolyticus in real samples. The reader, based on a screen printed carbon electrode, was modified with polylactide-stabilized gold nanoparticles and methylene blue was employed as the redox indicator. Detection was assessed using a microprocessor to measure current response under controlled potential. The fabricated sensor was able to specifically distinguish complementary, non-complementary and mismatched oligonucleotides...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28198433/a-cyclometalated-iridium-iii-complex-used-as-a-conductor-for-the-electrochemical-sensing-of-ifn-%C3%AE
#11
Xiangmin Miao, Chung-Nga Ko, Kasipandi Vellaisamy, Zongbing Li, Guanjun Yang, Chung-Hang Leung, Dik-Lung Ma
A novel iridium(III) complex was prepared and used as a conductor for sensitive and enzyme-free electrochemical detection of interferon gamma (IFN-γ). This assay is based on a dual signal amplification mechanism involving positively charged gold nanoparticles ((+)AuNPs) and hybridization chain reaction (HCR). To construct the sensor, nafion (Nf) and (+)AuNPs composite membrane was first immobilized onto the electrode surface. Subsequently, a loop-stem structured capture probe (CP) containing a special IFN-γ interact strand was modified onto the (+)AuNP surface via the formation of Au-S bonds...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28195202/application-of-pristine-and-doped-sno2-nanoparticles-as-a-matrix-for-agro-hazardous-material-organophosphate-detection
#12
Naushad Khan, Taimur Athar, H Fouad, Ahmad Umar, Z A Ansari, S G Ansari
With an increasing focus on applied research, series of single/composite materials are being investigated for device development to detect several hazardous, dangerous, and toxic molecules. Here, we report a preliminary attempt of an electrochemical sensor fabricated using pristine Ni and Cr-doped nano tin oxide material (SnO2) as a tool to detect agro-hazardous material, i.e. Organophosphate (OP, chlorpyrifos). The nanomaterial was synthesized using the solution method. Nickel and chromium were used as dopant during synthesis...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194968/pedot-pss-as-solid-contact-for-ion-selective-electrodes-the-influence-of-the-pedot-pss-film-thickness-on-the-equilibration-times
#13
Marcin Guzinski, Jennifer Marie Jarvis, Felio Perez, Bradford D Pendley, Erno Lindner, Roland de Marco, Gaston A Crespo, Robert G Acres, Raymart Walker, Josiah Luke Bishop
To understand the rate determining processes during the equilibration of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate-based (PEDOT(PSS)-based) solid contact (SC) ion-selective electrodes (ISEs), the surfaces of Pt, Au, and GC electrodes were coated with 0.1, 1.0, 2.0 and 4.0μm thick galvanostatically deposited PEDOT(PSS) films. Next, potential vs. time transients were recorded with these electrodes, with and without an additional potassium ion-selective membrane (ISM) coating, following their first contact with 0...
February 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28193355/a-paper-based-nanomodified-electrochemical-biosensor-for-ethanol-detection-in-beers
#14
Stefano Cinti, Mattia Basso, Danila Moscone, Fabiana Arduini
Herein, we report the first example of a paper-based screen-printed biosensor for the detection of ethanol in beer samples. Common office paper was adopted to fabricate the analytical device. The properties of this paper-based screen-printed electrode (SPE) were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, and they were compared with the well-established polyester-based SPEs as well. Paper demonstrated similar properties when compared with polyester, highlighting suitability towards its utilization in sensor development, with the advantages of low cost and simple disposal by incineration...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28193351/electrochemical-sensors-based-on-magnetic-molecularly-imprinted-polymers-a-review
#15
REVIEW
Paloma Yáñez-Sedeño, Susana Campuzano, José M Pingarrón
Participation of magnetic component in molecularly imprinted polymers (MIPs) has facilitated enormously the incorporation of these polymeric materials on electrode surfaces allowing the design of electrochemical sensors with very attractive analytical characteristics in terms of simplicity, reproducibility, low fabrication cost, high sensitivity and selectivity and rapid assay time. The magnetically susceptible resultant MIPs (MMIPs) allowed a simple and fast elution of the template molecules from MMIPs, are easily and faster collected without filtration, centrifugation or other complex operations and are also faster assembled and removed from the electrode surface by simply using an external magnetic field...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28193073/ultrasensitive-protease-sensors-using-selective-affinity-binding-selective-proteolytic-reaction-and-proximity-dependent-electrochemical-reaction
#16
Seonhwa Park, Gamwoo Kim, Jeongwook Seo, Haesik Yang
The development of a fast and ultrasensitive protease detection method is a challenging task. This paper reports ultrasensitive protease sensors exploiting (i) selective affinity binding, (ii) selective proteolytic reaction, and (iii) proximity-dependent electrochemical reaction. The selective affinity binding to capture IgG increases the concentration of the target protease (trypsin as a model protease) near the electrode, and the selective proteolytic reaction by trypsin increases the concentration of the redox-active species near the electrode...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28193044/engineered-iro2-nio-core-shell-nanowires-for-sensitive-non-enzymatic-detection-of-trace-glucose-in-saliva
#17
Junjun Wang, Lin Xu, Yang Lu, Kuang Sheng, Wei Liu, Cong Chen, Yang Li, Biao Dong, Hongwei Song
Hierarchical core-shell IrO2@NiO nanowires (NWs) have been designed through two simple steps, which combined electrospinning of IrO2 conductive core and chemical bath deposition growth of ultracontinuous NiO nanoflakes. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy-dispersive X-ray spectrometry mapping, and X-ray photoelectron spectroscopy were employed to characterize the morphologies and structures of the as-prepared samples, and the results were also carefully compared with that of pure NiO nanoflowers and IrO2 NWs...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192908/beyond-conventional-patterns-new-electrochemical-lithography-with-high-precision-for-patterned-film-materials-and-wearable-sensors
#18
Xiaowei Zhang, Shaojun Guo, Yanchao Han, Jing Li, Erkang Wang
We report a simple, low-cost, and brand-new electrochemical lithography technique for replicating the template pattern with high resolution at ∼2 μm. The developed method is that the electroactive material is first deposited on the patterned conductive template by the electrochemical technique and then peeled by an adhesive tape/material. The resulting film with the precise pattern shows excellent mechanical and electronic properties and promises high prospect in designing flexible electronics. This interesting approach can be performed at ambient conditions and easily generalized to pattern various electroactive materials covering metal, alloy, nonmetal, salt, oxide, and composite on different types of substrates in several seconds to a few minutes, making the mass production of flexible/rigid/stretchable patterned thin films quite possible...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192903/tin-oxide-crystals-exposed-by-low-energy-110-facets-for-enhanced-electrochemical-heavy-metal-ions-sensing-x-ray-absorption-fine-structure-experimental-combined-with-density-functional-theory-evidence
#19
Zhen Jin, Meng Yang, Shao-Hua Chen, Jin-Huai Liu, Qun-Xiang Li, Xing-Jiu Huang
Herein, we revealed that the electrochemical behaviors on the detection of heavy metal ions (HMIs) would largely rely on the exposed facets of SnO2 nanoparticles. Compared to the high-energy {221} facet, the low-energy {110} facet of SnO2 possessed better electrochemical performance. The adsorption/desorption tests, density-functional theory (DFT) calculations, and X-ray absorption fine structure (XAFS) studies showed that the lower barrier energy of surface diffusion on {110} facet was critical for the superior electrochemical property, which was favorable for the ions diffusion on the electrode, and further leading the enhanced electrochemical performance...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28189110/amplified-electrochemical-sensor-employing-cuo-swcnts-and-1-butyl-3-methylimidazolium-hexafluorophosphate-for-selective-analysis-of-sulfisoxazole-in-the-presence-of-folic-acid
#20
Hassan Karimi-Maleh, Fatemeh Amini, Ahmad Akbari, Moein Shojaei
In the present work, CuO nanoparticle decorated on single wall carbon nanotubes (CuO/SWCNTs) nanocomposite was successfully synthesized by chemical precipitation method and used for modification of carbon paste electrode (CPE) in the presence of 1-butyl-3-methylimidazolium hexafluorophosphate (1-B-3-MIHFP) liquid as binder. The novel voltammetric sensor was used as first electrochemical sensor for determination of sulfisoxazole (SFX). CuO/SWCNTs nanocomposite characterized by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD) methods...
February 3, 2017: Journal of Colloid and Interface Science
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