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https://www.readbyqxmd.com/read/28107983/characterization-of-inclusion-complexes-of-organic-ions-with-hydrophilic-hosts-by-ion-transfer-voltammetry-with-solvent-polymeric-membranes
#1
José Manuel Olmos, Eduardo Laborda, Joaquín Ángel Ortuño, Ángela Molina
The quantitative characterization of inclusion complexes formed in aqueous phase between organic ions and hydrophilic hosts by ion-transfer voltammetry with solvent polymeric membrane ion sensors is studied, both in a theoretical and experimental way. Simple analytical solutions are presented for the determination of the binding constant of the complex from the variation with the host concentration of the electrochemical signal. These solutions are valid for any voltammetric technique and for solvent polymeric membrane ion sensors comprising one polarisable interface (1PI) and also, for the first time, two polarisable interfaces (2PIs)...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107979/electrochemical-sensing-platform-based-on-molecularly-imprinted-polymer-decorated-n-s-co-doped-activated-graphene-for-ultrasensitive-and-selective-determination-of-cyclophosphamide
#2
Bintong Huang, Lili Xiao, Haifeng Dong, Xueji Zhang, Wei Gan, Shahid Mahboob, Khalid Abdullah Al-Ghanim, Qunhui Yuan, Yingchun Li
A novel electrochemical sensor has been facilely fabricated by applying composite elements consisting of nitrogen and sulfur co-doped activated graphene (N,S-AGR) and molecularly imprinted polymer (MIP). N,S-AGR was synthesized by one-pot pyrogenation of a mixture of thiourea, KOH and graphene oxide, which was introduced to improve electron transfer capability and surface area of the electrode, while the electro-polymerized MIP layer afforded simultaneous recognition and quantification of cyclophosphamide (CPA) by utilizing Fe(CN)6(3-/4-) as probe to indicate electrical signals...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107972/electrochemical-sensor-for-sensitive-detection-of-triclosan-based-on-graphene-palladium-nanoparticles-hybrids
#3
Tingxuan Wu, Tingting Li, Zhiguang Liu, Yujing Guo, Chuan Dong
In this paper, poly (diallyldimethylammonium chloride) functionalized graphene/palladium nanoparticles (PDDA-Gr/PdNPs) have been successfully synthesized through a simple one-pot method with the use of PDDA as stabilizing agents. The electrochemical response of triclosan on the PDDA-Gr/PdNPs modified glassy carbon electrode (GCE) is greatly enhanced comparing to the PDDA-Gr/GCE or the bare GCE. It is suggested that the nanocomposite exhibited good electron transfer ability and catalytic activity. Under the optimal conditions, the oxidation current increased linearly with the concentration of triclosan in the range of 9...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107936/a-simple-and-sensitive-method-for-determination-of-taxifolin-on-palladium-nanoparticles-supported-poly-diallyldimethylammonium-chloride-functionalized-graphene-modified-electrode
#4
Qinqin Wang, Lu Wang, Gaiping Li, Baoxian Ye
Palladium nanoparticles with diameter of around 5-10nm supported on poly (diallyldimethylammonium chloride) (PDDA)-functionalized graphene composites were prepared by a simple chemical method. As-prepared nanocomposites were characterized by transmission electron microscopy (TEM), x-ray diffraction (XRD), ultraviolet-visible spectrophotometry (UV-vis) and electrochemical techniques, which were clearly demonstrated that palladium nanoparticles were uniformly dispersed on the graphene sheets. Based on the PDDA-Gr-Pd nanocomposites, a new voltammetric sensor was established and exhibited excellent electrocatalytic activity and fast electron transfer rate toward taxifolin...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107932/mesoporous-nico2o4-decorated-reduced-graphene-oxide-as-a-novel-platform-for-electrochemical-determination-of-rutin
#5
Shiqiang Cui, Li Li, Yaping Ding, Jiangjiang Zhang, Hua Yang, Yingzi Wang
The glassy carbon electrode (GCE) modified with mesoporous NiCo2O4-decorated reduced graphene oxide (NiCo2O4/rGO) was first applied for the electrochemical determination of rutin. The synthesized NiCo2O4 and NiCo2O4/rGO were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) method. The sensor not only showed a satisfactory linear range (0.1-150μM) and detection limit (0...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107925/green-synthesized-co-nanoparticles-doped-amino-graphene-modified-electrode-and-its-application-towards-determination-of-baicalin
#6
Kai Sheng, Lu Wang, Huichao Li, Lina Zou, Baoxian Ye
The present paper reported an one-pot synthesis of Co nanoparticles doped amino-graphene nanocomposites (Co-amino-Gr), involving in situ generation of Co nanoparticles (NPs). The simultaneous reduction of graphene oxide (GO) and Co(2+) to produce Co-amino-Gr had been achieved under mild reaction conditions using an environmentally benign reducing agent, glycine. By combining the merits of amino-Gr and the Co NPs, a highly sensitive electrochemical sensor was erected to detect baicalin based on the Co-amino-Gr nanocomposites...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107905/a-multi-walled-carbon-nanotubes-based-molecularly-imprinted-polymers-electrochemical-sensor-for-the-sensitive-determination-of-hiv-p24
#7
Ya Ma, Xiao-Lei Shen, Qiang Zeng, Hai-Shui Wang, Li-Shi Wang
To develop a rapid, simple and sensitive method for the determination of human immunodeficiency virus p24 (HIV-p24), a novel molecularly imprinted polymers (MIPs) electrochemical sensor was constructed on the surface of a multi-walled carbon nanotubes (MWCNTs) modified glassy carbon electrode (GCE) by surface polymerization using acrylamide (AAM) as functional monomer, N,N'-methylenebisacrylamide (MBA) as cross-linking agent and ammonium persulphate (APS) as initiator. Each modification step was carefully examined by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and scanning electron microscope (SEM)...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28106820/current-and-emerging-technology-for-continuous-glucose-monitoring
#8
REVIEW
Cheng Chen, Xue-Ling Zhao, Zhan-Hong Li, Zhi-Gang Zhu, Shao-Hong Qian, Andrew J Flewitt
Diabetes has become a leading cause of death worldwide. Although there is no cure for diabetes, blood glucose monitoring combined with appropriate medication can enhance treatment efficiency, alleviate the symptoms, as well as diminish the complications. For point-of-care purposes, continuous glucose monitoring (CGM) devices are considered to be the best candidates for diabetes therapy. This review focuses on current growth areas of CGM technologies, specifically focusing on subcutaneous implantable electrochemical glucose sensors...
January 19, 2017: Sensors
https://www.readbyqxmd.com/read/28105815/in-vivo-analysis-with-electrochemical-sensors-and-biosensors
#9
Tongfang Xiao, Fei Wu, Jie Hao, Meining Zhang, Ping Yu, Lanqun Mao
No abstract text is available yet for this article.
January 3, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28094510/nanoporous-gold-based-electrode-morphology-libraries-for-investigating-structure-property-relationships-in-nucleic-acid-based-electrochemical-biosensors
#10
Zimple Matharu, Pallavi Daggumati, Ling Wang, Tatiana S Dorofeeva, Zidong Li, Erkin Seker
Nanoporous gold (np-Au) electrode coatings significantly enhance performance of electrochemical nucleic acid biosensors due to their three-dimensional nanoscale network, high electrical conductivity, facile surface functionalization, and biocompatibility. Contrary to planar electrodes, the np-Au electrodes also exhibit sensitive detection in the presence of common biofouling media due to their porous structure. However, the pore size of the nano-matrix plays a critical role in dictating the extent of biomolecular capture and transport...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28093592/synthesis-and-optical-and-electrochemical-properties-of-julolidine-structured-pyrido-3-4-b-indole-dye
#11
Toshiaki Enoki, Keishi Matsuo, Joji Ohshita, Yousuke Ooyama
The julolidine-structured pyrido[3,4-b]indole dye ET-1 has been newly designed and developed as a small D-A fluorescent dye. ET-1 showed bathochromic shifts of the fluorescence band upon changing from aprotic solvents to protic solvents, as well as positive fluorescence solvatochromism. Moreover, it was found that ET-1 can form a 1 : 1 Py(N)-B complex with boron trifluoride and a hydrogen-bonded proton transfer (Py(N)-H) complex with trifluoroacetic acid, which exhibit photoabsorption and fluorescence bands at a longer wavelength region than the pristine ET-1...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28088750/continuous-minimally-invasive-alcohol-monitoring-using-microneedle-sensor-arrays
#12
A M Vinu Mohan, Joshua Ray Windmiller, Rupesh K Mishra, Joseph Wang
The present work describes an attractive skin-worn microneedle sensing device for the minimally invasive electrochemical monitoring of subcutaneous alcohol. The device consists of an assembly of pyramidal microneedle structures integrated with Pt and Ag wires, each with a microcavity opening. The microneedle aperture was modified by electropolymerizing o-phenylene diamine onto the Pt wire microtransducer, followed by the immobilization of alcohol oxidase (AOx) in an intermediate chitosan layer, along with an outer Nafion layer...
January 10, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28080058/fabrication-of-pedot-nanocone-arrays-with-electrochemically-modulated-broadband-antireflective-properties
#13
Seulgi So, Han Wai Millie Fung, Kellen Kartub, Adam M Maley, Robert M Corn
Ordered nanocone arrays of the electroactive polymer poly(3,4-ethylenedioxythiophene) (PEDOT) were fabricated by the simultaneous oxygen plasma etching of an electrodeposited PEDOT thin film coated with a hexagonally closed packed polystyrene bead monolayer. PEDOT nanocone arrays with an intercone spacing of 200 nm and an average nanocone height of 350 nm exhibited a low broadband reflectivity of <1.5% from 550 to 800 nm. Electrochemical modulation of the oxidation state of the PEDOT nanocone array film was used to change both its ex situ absorption spectrum (electrochromism) and reflection spectrum (electroreflectivity)...
January 13, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28075594/high-curvature-nanostructuring-enhances-probe-display-for-biomolecular-detection
#14
Phil De Luna, Sahar Mahshid, Jagotamoy Das, Binquan Luan, Edward H Sargent, Shana O Kelley, Ruhong Zhou
High-curvature electrodes facilitate rapid and sensitive detection of a broad class of molecular analytes. These sensors have reached detection limits not attained using bulk macroscale materials. It has been proposed that immobilized DNA probes are displayed at a high deflection angle on the sensor surface, allowing greater accessibility and more efficient hybridization. Here we report the first use of all-atom molecular dynamics simulations coupled with electrochemical experiments to explore the dynamics of ssDNA immobilized on high-curvature vs...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28071894/noninvasive-monitoring-of-blood-glucose-with-raman-spectroscopy
#15
Rishikesh Pandey, Santosh Kumar Paidi, Tulio A Valdez, Chi Zhang, Nicolas Spegazzini, Ramachandra Rao Dasari, Ishan Barman
The successful development of a noninvasive blood glucose sensor that can operate reliably over sustained periods of time has been a much sought after but elusive goal in diabetes management. Since diabetes has no well-established cure, control of elevated glucose levels is critical for avoiding severe secondary health complications in multiple organs including the retina, kidney and vasculature. While fingerstick testing continues to be the mainstay of blood glucose detection, advances in electrochemical sensing-based minimally invasive approaches have opened the door for alternate methods that would considerably improve the quality of life for people with diabetes...
January 10, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28069939/real-time-measurement-of-small-molecules-directly-in-awake-ambulatory-animals
#16
Netzahualcóyotl Arroyo-Currás, Jacob Somerson, Philip A Vieira, Kyle L Ploense, Tod E Kippin, Kevin W Plaxco
The development of a technology capable of tracking the levels of drugs, metabolites, and biomarkers in the body continuously and in real time would advance our understanding of health and our ability to detect and treat disease. It would, for example, enable therapies guided by high-resolution, patient-specific pharmacokinetics (including feedback-controlled drug delivery), opening new dimensions in personalized medicine. In response, we demonstrate here the ability of electrochemical aptamer-based (E-AB) sensors to support continuous, real-time, multihour measurements when emplaced directly in the circulatory systems of living animals...
January 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28069511/in-vivo-characterization-of-magnesium-alloy-biodegradation-using-electrochemical-h2-monitoring-icp-ms-and-xps
#17
Daoli Zhao, Tingting Wang, Keaton Nahan, Xuefei Guo, Zhanping Zhang, Zhongyun Dong, Shuna Chen, Da-Tren Chou, Daeho Hong, Prashant N Kumta, William R Heineman
: The effect of widely different corrosion rates of Mg alloys on four parameters of interest for in vivo characterization was evaluated: (1) the effectiveness of transdermal H2 measurements with an electrochemical sensor for noninvasively monitoring biodegradation compared to the standard techniques of in vivo X-ray imaging and weight loss measurement of explanted samples, (2) the chemical compositions of the corrosion layers of the explanted samples by XPS, (3) the effect on animal organs by histology, and (4) the accumulation of corrosion by-products in multiple organs by ICP-MS...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28068083/simultaneous-electrochemical-detection-of-benzimidazole-fungicides-carbendazim-and-thiabendazole-using-a-novel-nanohybrid-material-modified-electrode
#18
Yuanyuan Dong, Lijun Yang, Lei Zhang
In this work, a novel ZnFe2O4/SWCNTs nanohybrid was successfully synthesized as electrode material and applied to the simultaneous quantitative determination of carbendazim (CBZ) and thiabendazole (TBZ). The electrochemical behaviors of CBZ and TBZ on the ZnFe2O4/SWCNTs/GCE were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The electrochemical active area of modified electrode was calculated, which is nearly 5.5 times that of the bare electrode. The influence of various factors such as accumulation time, pH and scan rates, type of surfactant, and the electrochemical reaction mechanism was studied...
January 18, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28064128/a-novel-luminescence-functionalized-metal-organic-framework-nanoflowers-electrochemiluminesence-sensor-via-on-off-system
#19
Shu Zhu, Xia Lin, Peiyao Ran, Qiao Xia, Chengcheng Yang, Jiao Ma, Yingzi Fu
A novel solid-state electrochemiluminesence (ECL) "on-off" switch system for highly sensitive detection of tryptophan based on the luminescence-functionalized ruthenium metal-organic framework (Ru-MOF) nanoflowers and CdS quantum dots (CdSQDs) was described. Ru-MOF nanoflowers were prepared by a one-step solvothermal method at low temperature and characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectra and fluorescence (FL) spectra...
January 3, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28063965/a-calix-4-arene-derivative-and-its-selective-interaction-with-drugs-clofibric-acid-diclofenac-and-aspirin
#20
Angela F Danil de Namor, Maan Al Nuaim, Jose A Villanueva Salas, Sophie Bryant, Brendan Howlin
The synthesis and characterisation of a partially substituted calix[4]arene, namely, 5,11,17,23-tetra-tert-butyl,25,27-bis[aminoethoxy] 26,28-dihydroxycalix[4]arene are reported. Its interaction with commonly used pharmaceuticals (clofibric acid, diclofenac and aspirin) was investigated by spectroscopic ((1)H NMR and UV), electrochemical (conductance measurements) and thermal (titration calorimetry) techniques. It is concluded on the basis of the experimental work and molecular simulation studies that the receptor interacts selectively with these drugs...
January 4, 2017: European Journal of Pharmaceutical Sciences
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