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Zehang Zhou, Weerapha Panatdasirisuk, Tyler S Mathis, Babak Anasori, Canhui Lu, Xinxing Zhang, Zhiwei Liao, Yury Gogotsi, Shu Yang
Free-standing, highly flexible and foldable supercapacitor electrodes were fabricated through the spray-coating assisted layer-by-layer assembly of Ti3 C2 Tx (MXene) nanoflakes together with multi-walled carbon nanotubes (MWCNTs) on electrospun polycaprolactone (PCL) fiber networks. The open structure of the PCL network and the use of MWCNTs as spacers not only limit the restacking of Ti3 C2 Tx flakes but also increase the accessible surface of the active materials, facilitating fast diffusion of electrolyte ions within the electrode...
March 15, 2018: Nanoscale
Nina Fu, Yue Hu, Saihua Shi, Shaokang Ren, Wei Liu, Shao Su, Baomin Zhao, Lixing Weng, Lianhui Wang
MiRNAs are small regulatory RNAs that play crucial roles in the oncogenic state in various cancers and have shown highly promising clinical applications as plasma-based markers for cancer classification and prognostication. Due to their electroanalytical advantages, photoelectrochemical biosensors are a very attractive alternative technology for miRNA sensing and detection. In this work, we demonstrated a novel photoelectrochemical (PEC) sensor using the in situ grown Au nanoparticles/two-dimensional molybdenum disulfide (MoS2 ) nanosheet heterojunction (MoS2 -AuNPs) on ITO glass as the photoanode (MoS2 -AuNPs/ITO)...
March 8, 2018: Analyst
Tongfang Xiao, Yanan Jiang, Wenliang Ji, Lanqun Mao
The unique electronic and chemical structures of carbon nanotubes (CNTs) have well enabled their applications in electrochemistry and electroanalytical chemistry, however, the difficulty in reproducibly confining CNTs onto substrate electrode, particularly onto microelectrodes, still remains to be addressed. In this study, we develop a method to reproducibly confine single-walled carbon nanotubes (SWNTs) onto carbon fiber microelectrodes (CFEs) with electrophoretic deposition (EPD) for in vivo measurement of ascorbate...
March 8, 2018: Analytical Chemistry
Sylwia Smarzewska, Ewa Miękoś, Dariusz Guziejewski, Marek Zieliński, Barbara Burnat
The effect of constant magnetic field strength on activation of sensors modified with graphene oxide monolayers was investigated. The use of constant magnetic field resulted in improved electroanalytical properties of the sensors. It was proven that level of GO activation is clearly related to constant magnetic field strength. Moreover, it was demonstrated that observed phenomenon is stable in time.
June 29, 2018: Analytica Chimica Acta
Paolo Ugo
No abstract text is available yet for this article.
February 19, 2018: Analytical and Bioanalytical Chemistry
Sarah J MacEachern, Catherine M Keenan, Evangelia Papakonstantinou, Keith A Sharkey, Bhavik Anil Patel
BACKGROUND AND PURPOSE: Inflammatory bowel disease (IBD) is characterized by pain, bleeding, cramping and altered gastrointestinal (GI) function. Changes in mucosal serotonin (5-HT) signalling occur in animal models of colitis and in humans suffering from IBD. Melatonin is co-released with 5-HT from the mucosa and has a wide variety of actions in the GI tract. Here we examined how melatonin signalling is affected by colitis and determined how this relates to 5-HT signalling. EXPERIMENTAL APPROACH: Using electroanalytical approaches, we investigated how 5-HT release, reuptake and availability as well as melatonin availability are altered in dextran sodium sulfate (DSS)-induced colitis in mice...
February 15, 2018: British Journal of Pharmacology
Shelley D Minteer
No abstract text is available yet for this article.
February 15, 2018: Journal of the American Chemical Society
Aleksandar Zeradjanin
Enormous importance of the energy conversion and storage boosted research interest in various electrocatalytic materials. Characterization of solid/liquid interfaces during faradaic and non-faradaic processes is routinely conducted in many laboratories worldwide on a daily basis. This can be deemed as very positive tendency. However, careful insight into modern literature suggests frequent misuse of electroanalytical tools. This can have very negative implications and postpone overall development of electrocatalytic materials with desired properties...
February 12, 2018: ChemSusChem
Gerson A Ruiz-Córdova, Sabir Khan, Luís Moreira Gonçalves, Maria Isabel Pividori, Gino Picasso, Maria Del Pilar T Sotomayor
The determination of 1-chloro-2,4-dinitrobenzene (CDNB) was used as a proof-of-concept to a simple analytical practical configuration applying magnetic molecularly imprinted particles (mag-MIPs). Mag-MIPs were captured from an emulsion by a home-made magneto-sensor (where a small magnet was entrapped by a graphite-epoxy composite) and then, this sensor, was transferred to the solution containing the analyte, where, after binding to the mag-MIPs, the analyte was directly analysed using differential pulse voltammetry (DPV) since the magneto-sensor acted as the working electrode...
May 1, 2018: Talanta
K L Westmacott, A Crew, O Doran, J P Hart
This paper describes the development of a novel electrochemical assay for the measurement of water-soluble vitamins in food and pharmaceutical products. The optimum conditions for the determination of vitamin B 1 (thiamine), B 2 (riboflavin) and B 6 (pyridoxine) in phosphate buffer were established using cyclic voltammetry in conjunction with screen printed carbon electrodes (SPCEs). The optimum current response for all three vitamins was achieved in 0.1M phosphate buffer pH 11 using an initial potential of -1...
May 1, 2018: Talanta
Rukshan T Perera, Jacob K Rosenstein
Nanoscale working electrodes and miniaturized electroanalytical devices are valuable platforms to probe molecular phenomena and perform chemical analyses. However, the inherent close distance of metallic electrodes integrated into a small volume of electrolyte can complicate classical electroanalytical techniques. In this study, we use a scanning nanopipette contact probe as a model miniaturized electrochemical cell to demonstrate measurable side effects of the reaction occurring at a quasi-reference electrode...
January 31, 2018: Scientific Reports
Deonir Agustini, Lucas Fedalto, Márcio F Bergamini, Luiz Humberto Marcolino-Junior
The use of miniaturized chromatographic systems is an important strategy for reducing the consumption of supplies related to separations, allowing the development of more sustainable analytical methodologies. However, the high cost and complexity in the production of these systems combined with the operational difficulties and the need for the use of solvent and sample pretreatment are challenges to be overcome in order to make the chromatographic methods greener. Here, we report the construction and development of a low cost microfluidic system for green and solvent-free chromatographic separations with electrochemical detection integrated into cotton threads without the use of any mechanical pumping to transport the solutions...
January 26, 2018: Lab on a Chip
Yannick Tauran, Mehmet C Tarhan, Laurent Mollet, Jean Baptiste Gerves, Momoko Kumemura, Laurent Jalabert, Nicolas Lafitte, Ikjoo Byun, Beomjoon Kim, Hiroyuki Fujita, Dominique Collard, Florent Perret, Mickael Desbrosses, Didier Leonard, Christelle Goutaudier, Anthony W Coleman
The couple Calix[4]arene-1,3-O-diphosphorous acid (C4diP) and zinc ions (Zn2+) acts as a synergistic DNA binder. Silicon NanoTweezer (SNT) measurements show an increase in the mechanical stiffness of DNA bundles by a factor of >150, at Zn2+ to C4diP ratios above 8, as compared to Zinc alone whereas C4diP alone decreases the stiffness of DNA. Electroanalytical measurements using 3D printed devices demonstrate a progression of events in the assembly of C4diP on DNA promoted by zinc ions. A mechanism at the molecular level can be deduced in which C4diP initially coordinates to DNA by phosphate-phosphate hydrogen bonds or in the presence of Zn2+ by Zn2+ bridging coordination of the phosphate groups...
January 19, 2018: Scientific Reports
Ya-Ling Su, Shu-Hua Cheng
The toxicity of sulfa drugs has attracted great attention, and the reported electrochemical methods for sulfa drugs usually employ a high oxidation potential. In this work, a one-pot synthesized conducting polymer nanocomposite containing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 was cast on a screen-printed carbon electrode (SPCE), and the modified electrode showed superior electrochemical activity over a bare electrode for sulfamethazine (SMZ) determination. The SMZ detection was based on the electrochemical oxidation product, which showed an adsorptive property and exhibited a redox couple at 0...
April 1, 2018: Talanta
Virgilio X G Oliveira, Anderson A Dias, Leandro L Carvalho, Thiago M G Cardoso, Flavio Colmati, Wendell K T Coltro
This study describes the use of electrochemical paper-based analytical devices (ePADs) drawn with graphite pencil for the determination of ascorbic acid (AA) in commercial tablets. ePADs were fabricated using vegetal paper and graphite pencil. First, the three-electrode electrochemical cell drawn using a graphical software and toner lines were laser printed on the vegetal paper surface to delimit the electrode areas. Then, the electrode regions were manually painted with graphite pencil. Afterwards, the pseudo-reference electrode was defined with the deposition of silver ink over the graphite surface...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Felipe Fantinato Hudari, João Carlos Souza, Maria Valnice Boldrin Zanoni
Hemodialysis is the most commonly used method for the treatment of chronic kidney disease. In this procedure, some patients use diuretics to control weight gain and blood pressure. In this work, a voltammetric sensor based on a glassy carbon electrode modified with carbon nanotubes (GCE/MWCNT) is described for the simultaneous determination of the diuretics hydrochlorothiazide (HCT) and triamterene (TRT). The oxidation of the diuretics on the GCE/MWCNT surface was observed at 1.01 and 1.17V for HCT and TRT, respectively, allowing simultaneous determination, which was not possible with the unmodified glassy carbon electrode...
March 1, 2018: Talanta
Patrícia B Deroco, Romeu C Rocha-Filho, Orlando Fatibello-Filho
The first electroanalytical method for the simultaneous determination of an important antibiotic (amoxicillin - AMX) and an anti-inflammatory drug (nimesulide -NIM), widely used in combination, is here proposed. In this method, a glassy carbon (GC) substrate modified with carbon black (CB) immobilized within a dihexadecylphosphate (DHP) film is used as electrochemical sensor (CB-DHP/GC). The electrochemical activity of this sensor was assessed (comparatively to that of GC) by electrochemical impedance spectroscopy, using the [Fe(CN)6]3-/4- redox couple, when two different active electron transfer regions were clearly characterized...
March 1, 2018: Talanta
Dale A C Brownson, Graham C Smith, Craig E Banks
The modification of electrode surfaces is widely implemented in order to try and improve electron transfer kinetics and surface interactions, most recently using graphene related materials. Currently, the use of 'as is' graphene oxide (GO) has been largely overlooked, with the vast majority of researchers choosing to reduce GO to graphene or use it as part of a composite electrode. In this paper, 'as is' GO is explored and electrochemically characterized using a range of electrochemical redox probes, namely potassium ferrocyanide(II), N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD), dopamine hydrochloride and epinephrine...
November 2017: Royal Society Open Science
Patrícia B Deroco, Roberta A Medeiros, Romeu C Rocha-Filho, Orlando Fatibello-Filho
A novel, unique electroanalytical method was developed for the simultaneous quantification of the dyes indigo carmine (IC) and allura red (AR) in candies by coupling flow injection analysis and multiple pulse amperometry with a cathodically pretreated boron-doped diamond electrode, using 0.30 mol L-1 H2SO4 as supporting electrolyte. A dual-potential waveform was employed, causing the electrooxidation of either IC solely or IC and AR simultaneously. Thence, subtraction of current signals was used to quantify IC and AR in the concentration ranges of 70...
May 1, 2018: Food Chemistry
Adriane F Brito, Patrícia C C S Braga, Lorrane K S Moreira, Dayane M Silva, Daiany P B Silva, Germán Sanz, Boniek G Vaz, Flávio S de Carvalho, Luciano M Lião, Rafaela R Silva, François Noël, Hiasmin F S Neri, Paulo C Ghedini, Murilo F de Carvalho, Eric de S Gil, Elson A Costa, Ricardo Menegatti
In the scope of a research program aimed at developing new drugs for the treatment of central nervous system diseases, we describe herein the synthesis and pharmacological evaluation of 1-(4-(3,5-di-tert-butyl-4-hydroxybenzyl) piperazin-1-yl)-2-methoxyethan-1-one (LQFM180). This compound showed antioxidant activity in two models, electroanalytical assays, and DPPH activity. Moreover, in behavioral tests as the open field test LQFM180 (9.4, 18.8, and 37.6 mg/kg, per oral (p.o.)), we detected anxiolytic-like activity...
December 19, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
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