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Marwa R El-Zahry
A comparative study of two types of silver nanoparticles was investigated. The effect of the surface chemistry of the studied silver nanoparticles (AgNPs) on their localized surface plasmon resonance was utilized for the quantitative determination of muscle relaxant tizanidine drug. The studied AgNPs are classified according to the type of stabilizing agent used in their synthesis into electrostatically and sterically stabilized AgNPs. The electrostatically-stabilized AgNPs (AA AgNPs) were prepared using ascorbic acid as both reducing and protective agents in alkaline medium...
August 15, 2018: Talanta
Jingjing Jiang, Xinyi Lin, Dong Ding, Guowang Diao
Taking advantages of the toehold-triggered strand displacement reaction (TSDR) and host-guest interaction of β-cyclodextrin (β-CD), a facile enzyme-free and homogeneous electrochemical sensing strategy was designed for the sensitive assay of target DNA using Fe3 O4 @SiO2 @β-CD nanocomposites and ferrocene-labeled hairpin DNA (H-1) as the capture and electrochemical probes, respectively. Upon addition of target molecule, the initiated TSDR process induced the conformational change of H-1, and subsequently stimulated the dynamic assembly of assist probes (A-1 and A-2) to generate H-1:A-1:A-2 duplex along with the release of target sequence...
April 17, 2018: Biosensors & Bioelectronics
Cristian Pezzato, Minh T Nguyen, Dong Jun Kim, Ommid Anamimoghadam, Lorenzo Mosca, Fraser Stoddart
Artificial molecular machines can be operated using either physical or chemical inputs. Light-powered motors display clean and autonomous operations, whereas chemically-driven machines generate waste products and are intermittent in their motions. Herein, we show that controlled changes in applied electrochemical potentials can drive the operation of artificial molecular pumps in a semi-autonomous manner - that is, without the need for consecutive additions of chemical fuel(s). The electroanalytical approach described in this communication promotes the assembly of cyclobis(paraquat-p-phenylene) rings along a positively charged oligomeric chain, providing easy access to the formation of multiple mechanical bonds by means of a controlled supply of electricity...
May 18, 2018: Angewandte Chemie
Navanietha Krishnaraj Rathinam, Abhilash K Tripathi, Alevtina Smirnova, Haluk Beyenal, Rajesh K Sani
The present study is focused on enhancing the rheological properties of the electrolyte and eliminating sedimentation of microorganisms/flocs without affecting the electron transfer kinetics for improved bioelectricity generation. Agar derived from polysaccharide agarose (0.05-0.2%, w/v) was chosen as a rheology modifying agent. Electroanalytical investigations showed that electrolytes modified with 0.15% agar display a nine-fold increase in current density (1.2 mA/cm2 ) by a thermophilic strain (Geobacillus sp...
April 24, 2018: Bioresource Technology
Liuyang Zhang, Jinju Luo, Xinyu Shen, Chunya Li, Xian Wang, Bei Nie, Huaifang Fang
Direct detecting of trace amount Al(III) in aqueous solution by stripping voltammetry is often frustrated by its irreversible reduction, resided at −1.75 V (vs. Ag/AgCl reference), which is in a proximal potential of proton reduction. Here, we described an electroanalytical approach, combined with liquid phase microextraction (LPME) using ionic liquid (IL), to quantitatively assess trace amount aluminum in environmental samples. The Al(III) was caged by 8-hydroxyquinoline, forming a superb hydrophobic metal⁻chelate, which sequentially transfers and concentrates in the bottom layer of IL-phase during LPME...
May 10, 2018: Sensors
Jianjun Liao, Junping Zhang, Cai-Zhuang Wang, Shiwei Lin
In order to further improve the electroanalytical performance toward heavy metal ions, core-ring structured NiCo2 O4 nanoplatelets were used to modify glass carbon electrode (GCE) for the determination of heavy metal ions in water. Owing to the high surface area of NiCo2 O4 nanoplatelets, the Pb(II) sensitivity increased by a factor of 1.70, and the detection limit decreased by a factor of 2.64 as compared to solid NiCo2 O4 nanoparticles modified GCE. Interestingly, NiCo2 O4 nanoplatelets showed different sensitivities toward heavy metal ions with the same valence states, following the order Pb(II) > Cd(II) > Hg(II) > Cu(II)...
August 31, 2018: Analytica Chimica Acta
Ghobad Mohammadi, Elahe Faramarzi, Majid Mahmoudi, Sirous Ghobadi, Ali Reza Ghiasvand, Hector C Goicoechea, Ali R Jalalvand
In this work, voltammetric data recorded by a glassy carbon electrode (GCE) was used to investigate the interactions of tolcapone (Tasmar, TAS) with human serum albumin (HSA) at the electrode surface. The recorded voltammetric data was also combined with spectroscopic data to construct an augmented data matrix which was analysed by multivariate curve resolution-alternating least squares (MCR-ALS) as an efficient chemometric tool to obtain more information about TAS-HSA interactions. The results of MCR-ALS confirmed formation of one complex species (HSA-TAS2 ) and application of MCR-BANDS to the results of MCR-ALS confirmed the absence of rotational ambiguities and existing unambiguous and reliable results...
April 17, 2018: Journal of Pharmaceutical and Biomedical Analysis
Sajad Ahmad Bhat, Nusrat Rashid, Mudasir Ahmad Rather, Sarwar Ahmad Pandit, Ghulam Mohammad Rather, Pravin P Ingole, Mohsin Ahmad Bhat
The recent reports about the promising and tuneable electrocatalytic activity and stability of nanoalloys have stimulated an intense research activity towards the design and synthesis of homogenously alloyed novel bimetallic nano-electrocatalysts. We, herein present a simple one-pot facile wet-chemical approach for the deposition of high quality bimetallic palladium-silver (PdAg) homogenous nanoalloy crystals on reduced graphene oxide (Gr) sheets. Morphological, structural and chemical characterization of the so crafted nanohybrids establishes a homogeneous distribution of 1:1 PdAg nanoalloy crystals supported over reduced graphene oxide (PdAg-Gr)...
April 16, 2018: ACS Applied Materials & Interfaces
Alar Ainla, Maral P S Mousavi, Maria-Nefeli Tsaloglou, Julia Redston, Jeffrey G Bell, M Teresa Fernández-Abedul, George M Whitesides
This paper describes the design and characterization of an open-source universal wireless electrochemical detector (UWED). This detector interfaces with a smartphone (or a tablet) using Bluetooth Low Energy protocol; the smartphone provides (i) a user interface for receiving the experimental parameters from the user and visualizing the result in real-time, and (ii) a proxy for storing, processing, and transmitting the data and experimental protocols. This approach simplifies the design, and decreases both the size and the cost of the hardware; it also makes UWED adaptable to different types of analyses by simple modification of the software...
April 16, 2018: Analytical Chemistry
Jose Muñoz, Cristina Navarro-Senent, Nuria Crivillers, Marta Mas-Torrent
Carbon nanotubes (CNTs) have been studied as an electrochemical recognition element for the impedimetric determination of priority polycyclic aromatic hydrocarbons (PAHs) in water, using hexocyanoferrate as a redox probe. For this goal, an indium tin oxide (ITO) electrode functionalized with a silane-based self-assembled monolayer carrying CNTs has been engineered. The electroanalytical method, which is similar to an antibody-antigen assay, is straightforward and exploits the high CNT-PAH affinity obtained via π-interactions...
April 14, 2018: Mikrochimica Acta
Lei Wang, Tianjiao Meng, Yanwei Fan, Chunxia Chen, Ziwei Guo, Huan Wang, Yufan Zhang
Decoration of leaf-like zeolitic imidazolate framework (ZIF-L) with Au nanoparticles (NPs) by a simple self-assembly method was described in this work. The materials were characterized by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectra, N2 adsorption, and thermogravimetric analysis. Acetaminophen (AP) is most commonly referred to as an over-the-counter antipyretic and analgesic, which is a key factor in relieving fever and pain. It is particular significant to take efforts and conduct research for the development of reliable methods to detect the AP...
April 3, 2018: Journal of Colloid and Interface Science
Bruno R L Ferraz, Tiago Guimarães, Demetrius Profeti, Luciene P R Profeti
For the first time, sulfanilamide (SFD) was determined in otologic solution, human urine and serum by electroanalytical techniques on glassy carbon electrode (GCE). The cyclic voltammetry (CV) experiments showed an irreversible oxidation peak at +1.06 V in 0.1 mol/L BRBS (pH = 2.0) at 50 mV/s. Different voltammetric scan rates (from 10 to 250 mV/s) suggested that the oxidation of SFD on the GCE was a diffusion-controlled process. Square-wave voltammetry (SWV) method under optimized conditions showed a linear response to SFD from 5...
February 2018: Journal of Pharmaceutical Analysis
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 Ti3C2Tx (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 Ti3C2Tx flakes but also increase the accessible surface of the active materials, facilitating fast diffusion of electrolyte ions within the electrode...
March 29, 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 26, 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 electrodes, 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...
April 3, 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.
May 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 5-HT (serotonin) 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...
May 2018: British Journal of Pharmacology
Shelley D Minteer
No abstract text is available yet for this article.
February 28, 2018: Journal of the American Chemical Society
Aleksandar R Zeradjanin
Focus on the importance of 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 a 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 the desired properties...
April 25, 2018: ChemSusChem
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