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https://www.readbyqxmd.com/read/28213250/novel-electroanalytical-method-based-on-the-electrostriction-phenomenon-and-its-application-to-determination-of-cr-vi-by-the-flow-injection-technique
#1
Marcin Wieczorek, Jolanta Kochana, Paweł Knihnicki, Karolina Wapiennik, Paweł Kościelniak
The electrostriction phenomenon is observed in membranes of thickness in the nanometer range, e.g. bilayer lipid membranes or self-assembled monolayers. Strong electrical field of 105-106V/cm in intensity appears when applying the potential lower than 1V to these membranes. Electrostatic forces change the dimensions of a dielectric, hence the membrane compression and decrease in thickness are observed. As a result, increase in the membrane capacitance is recorded. The presented work covers development and application of a new analytical method based on the innovative capacitance-to-frequency conversion method and flow technique...
May 1, 2017: Talanta
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
#2
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
#3
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/28192902/concentration-normalized-electroanalytical-assaying-of-exosomal-markers
#4
Qian Li, George K Tofaris, Jason J Davis
Exosomes are both active in mediating intracellular communication and potentially present a potent cargo of disease biomarkers to an assay. The robust evaluation of exosomal markers could lead to a paradigm shift in clinical analysis and associated care. To date, much of this has been hindered by issues of sample preparation and assay signal-to-noise. We introduce here the use of ultrasensitive electrochemical impedance spectroscopy to quantify both external (tetraspanin) and internal (syntenin) exosome-specific markers...
February 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28165236/identification-of-an-electrode-adsorbed-intermediate-in-the-catalytic-hydrogen-evolution-mechanism-of-a-cobalt-dithiolene-complex
#5
Katherine J Lee, Brian D McCarthy, Eric S Rountree, Jillian L Dempsey
Analysis of a cobalt bis(dithiolate) complex reported to mediate hydrogen evolution under electrocatalytic conditions in acetonitrile revealed that the cobalt complex transforms into an electrode-adsorbed film upon addition of acid prior to application of a potential. Subsequent application of a reducing potential to the film results in desorption of the film and regeneration of the molecular cobalt complex in solution, suggesting that the adsorbed species is an intermediate in catalytic H2 evolution. The electroanalytical techniques used to examine the pathway by which H2 is generated, as well as the methods used to probe the electrode-adsorbed species, are discussed...
February 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28157656/integration-of-gold-sputtered-electrofluidic-paper-on-wire-included-analytical-platforms-for-glucose-biosensing
#6
Estefanía Núnez-Bajo, M Carmen Blanco-López, Agustín Costa-García, M Teresa Fernández-Abedul
This work describes the fabrication and evaluation of an electroanalytical paper-based platform based on the combination of both, reusable and disposable materials in order to generate simple, versatile and low-cost microfluidic devices. With this aim, a holder containing metal wires that act as reusable reference and counter electrodes has been developed. The gold-sputtered paper electrode is disposable and easily interchangeable, meanwhile the platform that includes reference and counter electrodes can be reused...
January 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28107918/bismuth-nanoparticles-carbon-nanotubes-modified-sensor-for-sulfasalazine-analysis
#7
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
#8
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
#9
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...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28054050/use-of-a-redox-probe-for-an-electrochemical-rna-ligand-binding-assay-in-microliter-droplets
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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