keyword
MENU ▼
Read by QxMD icon Read
search

electroanalytical

keyword
https://www.readbyqxmd.com/read/28107918/bismuth-nanoparticles-carbon-nanotubes-modified-sensor-for-sulfasalazine-analysis
#1
Biljana Nigović, Sandra Jurić, Iva Mitrović
Nanocomposite of bismuth nanoparticles and carbon nanotubes in Nafion matrix was used as modifier for glassy carbon electrode in analysis of anti-inflamatory drug sulfasalazine. The nanocomposite surface exhibited exceptional synergy and remarkable enhancement effect to the voltammetric response of drug. The surface morphology and structure characterization of the modified electrodes was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy and cyclic voltammetry. The sensor exhibited excellent electroanalytical performance for drug determination in comparison with bismuth film electrode...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28106173/hykl-40-cancer-biomarker-electroanalysis-in-serum-samples-and-model-cell-lysates-capacitive-immunosensing-compared-with-enzyme-label-immunosorbent-assays-elisa
#2
W Chaocharoen, A Schulte, W Suginta
Human chitinase 3-like protein 1 (CHI3L1 or hYKL-40), a potential molecular marker for several cancers, was measured in clinical human serum samples and model cell lysates by indirect and competitive enzyme-linked immunosorbent assay (ELISA) and by capacitive immunosensing, so as to evaluate a recently introduced electrochemical method for routine use in cancer-monitoring studies. The clinical samples tested included serum from four healthy individuals, five breast cancer and four glioblastoma patients; cultures of the human monocytic cell line THP-1, known to secrete hYKL-40, and of the human embryonic kidney 293t cell line, which does not express hYKL-40, provided cell lysates and cell culture media for positive and negative bio- and electrochemical control trials...
January 20, 2017: Analyst
https://www.readbyqxmd.com/read/28059498/rapid-screening-method-for-new-psychoactive-substances-of-forensic-interest-electrochemistry-and-analytical-determination-of-phenethylamines-derivatives-nbome-via-cyclic-and-differential-pulse-voltammetry
#3
Ana Flávia B Andrade, Samuel Kasahun Mamo, Jose Gonzalez-Rodriguez
The NBOMe derivatives are phenethylamines derived from the 2C class of hallucinogens. Only a few human pharmacologic studies have been conducted on these drugs, and several cases of intoxication and deaths have been reported. Presently, NBOMe are not a part of the routine drugs-of-abuse screening procedure for many police forces, and there are no rapid immunoassay screening tests that can detect the presence of those compounds. In this Article, the voltammetric behavior of 25B NBOMe and 25I NBOMe were investigated and their electroanalytical characteristics determined for the first time...
January 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28054050/use-of-a-redox-probe-for-an-electrochemical-rna-ligand-binding-assay-in-microliter-droplets
#4
Hélène Guyon, François Mavré, Marjorie Catala, Serge Turcaud, Franck Brachet, Benoît Limoges, Carine Tisné, Laurent Micouin
In this work, we report an affordable, sensitive, fast and user-friendly electroanalytical method for monitoring the binding between unlabeled RNA and small compounds in microliter-size droplets using a redox-probe and disposable miniaturized screen-printed electrochemical cells.
January 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28042840/nanobiosensing-with-arrays-and-ensembles-of-nanoelectrodes
#5
REVIEW
Najmeh Karimian, Ligia M Moretto, Paolo Ugo
Since the first reports dating back to the mid-1990s, ensembles and arrays of nanoelectrodes (NEEs and NEAs, respectively) have gained an important role as advanced electroanalytical tools thank to their unique characteristics which include, among others, dramatically improved signal/noise ratios, enhanced mass transport and suitability for extreme miniaturization. From the year 2000 onward, these properties have been exploited to develop electrochemical biosensors in which the surfaces of NEEs/NEAs have been functionalized with biorecognition layers using immobilization modes able to take the maximum advantage from the special morphology and composite nature of their surface...
December 30, 2016: Sensors
https://www.readbyqxmd.com/read/28018117/single-drop-electroanalysis-and-interfacial-interactions-sensitivity-versus-limit-of-detection-%C3%A2
#6
Charuksha Walgama, Matthew Gallman, Sadagopan Krishnan
We report single drop electroanalytical measurements of pharmaceutically and biologically relevant compounds using screen printed electrodes (SPEs) modified with carboxylated multiwalled carbon nanotubes (MWCNT-COOH) as the sensor surface. Acetaminophen, nicotine, ascorbic acid, and nicotinamide adenine dinucleotide reduced form (NADH) were detected in a single drop of solution. We show that combined polar and nonpolar interactions of analytes with -COOH functional groups and large surface area of MWCNT, respectively, allow highly sensitive analyte detection with wide dynamic range...
November 2016: Electroanalysis
https://www.readbyqxmd.com/read/28008432/polycrystalline-boron-doped-diamond-electrodes-for-electrocatalytic-and-electrosynthetic-applications
#7
Tribidasari A Ivandini, Yasuaki Einaga
Boron-doped diamond (BDD) electrodes are recognized as being superior to other electrode materials due to their outstanding chemical and dimensional stability, their exceptionally low background current, the extremely wide potential window for water electrolysis that they have, and their excellent biocompatibility. However, whereas these properties have been utilized in the rapid development of electroanalytical applications, very few studies have been done in relation to their applications in electrocatalysis or electrosynthesis...
December 23, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27998478/characterization-and-optimization-of-low-cost-microfluidic-thread-based-electroanalytical-device-for-micro-flow-injection-analysis
#8
Deonir Agustini, Márcio F Bergamini, Luiz Humberto Marcolino-Junior
The micro flow injection analysis (μFIA) is a powerful technique that uses the principles of traditional flow analysis in a microfluidic device and brings a number of improvements related to the consumption of reagents and samples, speed of analysis and portability. However, the complexity and cost of manufacturing processes, difficulty in integrating micropumps and the limited performance of systems employing passive pumps are challenges that must be overcome. Here, we present the characterization and optimization of a low cost device based on cotton threads as microfluidic channel to perform μFIA based on passive pumps with good analytical performance in a simple, easy and inexpensive way...
January 25, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/27989112/gold-nanoparticle-modified-transparent-carbon-ultramicroelectrode-arrays-for-the-selective-and-sensitive-electroanalytical-detection-of-nitric-oxide
#9
Janine Elliott, Jonathon Duay, Olja Simoska, Jason B Shear, Keith J Stevenson
Transparent carbon ultramicroelectrode arrays (T-CUAs) were made using a previously reported facile fabrication method (Duay et al. Anal. Chem. 2015, 87, 10109). Two modifications introduced to the T-CUAs were examined for their analytical response to nitric oxide (NO(•)). The first modification was the application of a cellulose acetate (CA) gas permeable membrane. Its selectivity to NO(•) was extensively characterized via chronoamperometry, electrochemical impedance spectroscopy (EIS), and atomic force microscopy (AFM)...
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/27934108/multianalytical-study-of-the-binding-between-a-small-chiral-molecule-and-a-dna-aptamer-evidence-for-asymmetric-steric-effect-upon-3-versus-5-end-sequence-modification
#10
Lylian Challier, Rebeca Miranda-Castro, Bertrand Barbe, Claire Fave, Benoît Limoges, Eric Peyrin, Corinne Ravelet, Emmanuelle Fiore, Pierre Labbé, Liliane Coche-Guérente, Eric Ennifar, Guillaume Bec, Philippe Dumas, François Mavré, Vincent Noël
Nucleic acid aptamers are involved in a broad field of applications ranging from therapeutics to analytics. Deciphering the binding mechanisms between aptamers and small ligands is therefore crucial to improve and optimize existing applications and to develop new ones. Particularly interesting is the enantiospecific binding mechanism involving small molecules with nonprestructured aptamers. One archetypal example is the chiral binding between l-tyrosinamide and its 49-mer aptamer for which neither structural nor mechanistic information is available...
December 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27857882/enhanced-electrochemical-sensing-with-carbon-nanotubes-modified-with-bismuth-and-magnetic-nanoparticles-in-a-lab-on-a-chip
#11
Preetha Jothimuthu, Joe L Hsu, Robert Chen, Mohammed Inayathullah, Venkata Raveendra Pothineni, Antony Jan, Geoffrey C Gurtner, Jayakumar Rajadas, Mark R Nicolls
Iron plays an especially important role in human physiological functions and pathological impairments. The superior properties of carbon nanotubes (CNTs) and their modification with bismuth and magnetic nanoparticles as developed in this work have led to an extraordinary and novel material to facilitate ultrasensitive detection in the nanomolar range. Here, we present the development of an electrochemical sensor for detection of ferrous (Fe(2+)) and ferric (Fe(3+)) iron by means of CNTs modified with bismuth and magnetic nanoparticles for higher sensitivity of detection...
September 2016: ChemNanoMat: Chemistry of Nanomaterials for Energy, Biology and More
https://www.readbyqxmd.com/read/27834863/novel-n-doped-carbon-dots-%C3%AE-cyclodextrin-nanocomposites-for-enantioselective-recognition-of-tryptophan-enantiomers
#12
Qi Xiao, Shuangyan Lu, Chusheng Huang, Wei Su, Shan Huang
Based on N-doped carbon dots/β-cyclodextrin nanocomposites modified glassy carbon electrodes (N-CDs/β-CD/GCE), an effective electrochemical sensor for enantioselective recognition of tryptophan (Trp) enantiomers was developed by differential pulse voltammograms (DPVs). Fluorescent N-CDs were synthesized through a hydrothermal method and characterized by spectroscopic approaches. The N-CDs/β-CD nanocomposites were efficiently electrodeposited on the surface of GCE through C-N bond formation between N-CDs and electrode...
November 9, 2016: Sensors
https://www.readbyqxmd.com/read/27816460/cuprac-colorimetric-and-electroanalytical-methods-determining-antioxidant-activity-based-on-prevention-of-oxidative-dna-damage
#13
Seda Uzunboy, Sema Demirci Çekiç, Ece Eksin, Arzum Erdem, Reşat Apak
An unbalanced excess of oxygen/nitrogen species (ROS/RNS) can give oxidative hazard to DNA and other biomacromolecules under oxidative stress conditions. While the 'comet' assay for measuring DNA damage is neither specific nor practical, monitoring oxidative changes on individual DNA bases and other oxidation products needs highly specialized equipment and operators. Thus, we developed a modified CUPRAC (cupric ion reducing antioxidant capacity) colorimetric method to determine the average total damage on DNA produced by Fenton oxidation, taking advantage of the fact that the degradation products of DNA but not the original macromolecule is CUPRAC-responsive...
February 1, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/27770927/mesoporous-carbon-foam-synthesized-via-modified-pechini-method-in-a-new-dispersant-of-salep-as-a-novel-substrate-for-electroanalytical-determination-of-epinephrine-in-the-presence-of-uric-acid
#14
Mojtaba Jahanbakhshi
Mesoporous carbon foam (MCF) with particular properties was prepared via a simplistic and template-free procedure. The synthesized MCF was characterized by transmission electron microscopy, field emission scanning electron microscopy, X-ray diffraction and BET surface area techniques. Porous MCF with pores diameters of 5 to 10nm provided a perfect substrate including extensive specific surface area to modify the electrodes surface. The obtained MCF was dispersed in Salep solution to prepare a stable suspension (S-MCF)...
January 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27769498/a-novel-electroanalytical-approach-based-on-the-use-of-a-room-temperature-ionic-liquid-for-the-determination-of-olive-oil-acidity
#15
M Antonietta Baldo, Paolo Oliveri, Remo Simonetti, Salvatore Daniele
In this paper, a novel voltammetric/amperometric approach for the direct determination of free acidity (FFA, expressed as mass percentage of free oleic acid) in olive oil samples is presented. The method is based on the reduction processes occurring at a platinum microdisk electrode involving the free fatty acids present in the matrices. To overcome problems related to the low conductivity of the samples investigated, olive oils were mixed with suitable amounts of the room temperature ionic liquid (RTIL), tri-hexyl(tetradecyl)phosphonium bis (trifluoromethylsulfonyl) imide ([P14,6,6,6](+)[NTf2](-)), which acted as a supporting electrolyte...
December 1, 2016: Talanta
https://www.readbyqxmd.com/read/27769491/highly-sensitive-determination-of-esculetin-on-tio2-nps-coated-poly-diallyldimethylammonium-chloride-functionalized-graphene-modified-electrode
#16
Huichao Li, Lu Wang, Kai Sheng, Lina Zou, Baoxian Ye
The nanocomposites of titanium dioxide nanoparticles decorated poly(diallyldimethylammonium chloride)-functionalized graphene (TiO2-PDDA-Gr) were successfully synthesized via a facile and green strategy. The prepared nanocomposites were characterized by X-ray diffraction (XRD), UV-visible spectrophotometry (UV-vis), Fourier Transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). By combining the merits of the PDDA-Gr and TiO2 NPs, a highly sensitive electrochemical sensor was erected to detect esculetin based on the TiO2-PDDA-Gr nanocomposites...
December 1, 2016: Talanta
https://www.readbyqxmd.com/read/27748597/renewable-solid-electrodes-in-microfluidics-recovering-the-electrochemical-activity-without-treating-the-surface
#17
Carlos A Teixeira, Gabriela F Giordano, Maisa B Beltrame, Luis C S Vieira, Angelo L Gobbi, Renato S Lima
The contamination, passivation, or fouling of the detection electrodes is a serious problem undermining the analytical performance of electroanalytical devices. The methods to regenerate the electrochemical activity of the solid electrodes involve mechanical, physical, or chemical surface treatments that usually add operational time, complexity, chemicals, and further instrumental requirements to the analysis. In this paper, we describe for the first time a reproducible method for renewing solid electrodes whenever their morphology or composition are nonspecifically changed without any surface treatment...
November 15, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27736057/scanning-electrochemical-microscopy-a-comprehensive-review-of-experimental-parameters-from-1989-to-2015
#18
David Polcari, Philippe Dauphin-Ducharme, Janine Mauzeroll
Scanning electrochemical microscopy (SECM) is an electroanalytical scanning probe technique capable of imaging substrate topography and local reactivity with high resolution. Since its inception in 1989, it has expanded into a wide variety of research areas including biology, corrosion, energy, kinetics, instrumental development, and surface modification. In the past 25 years, over 1800 peer-reviewed publications have focused on SECM, including several topical reviews. However, these reviews often omit key details, forcing readers to search the literature...
November 23, 2016: Chemical Reviews
https://www.readbyqxmd.com/read/27730817/single-nanoparticle-electrochemistry-through-immobilization-and-collision
#19
Todd J Anderson, Bo Zhang
Metal nanoparticles are key electrode materials in a variety of electrochemical applications including basic electron-transfer study, electrochemical sensing, and electrochemical surface enhanced Raman spectroscopy (SERS). Metal nanoparticles have also been extensively applied to electrocatalytic processes in recent years due to their high catalytic activity and large surface areas. Because the catalytic activity of metal nanoparticle is often highly dependent on their size, shape, surface ligands, and so forth, methods for examining and better understanding the correlation between particle structure and function are of great utility in the development of more efficient catalytic systems...
November 15, 2016: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27730812/sensitive-electrochemical-detection-of-human-methyltransferase-based-on-a-dual-signal-amplification-strategy-coupling-gold-nanoparticle-dna-complexes-with-ru-iii-redox-recycling
#20
Hui Zhang, Huilei Dong, Guoqing Yang, Hongfei Chen, Chenxin Cai
Effective detection of DNA methyltransferase (DNMT) activity is significant for cancer research. Herein, we developed a sensitive electroanalytical method to detect human DNA (cytosine-5)-methyltransferase 1 (DNMT1) from crude lysates of cancer cells. In this assay, capture DNA having a preferred DNMT1 methylation site was immobilized on a gold electrode and then hybridized with gold nanoparticle (Au NP)-DNA complexes. The modified electrodes were equilibrated with the lysate and then incubated with methylation-sensitive restriction enzyme...
November 15, 2016: Analytical Chemistry
keyword
keyword
101204
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"