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https://www.readbyqxmd.com/read/28345030/wearable-disposable-sweat-based-glucose-monitoring-device-with-multistage-transdermal-drug-delivery-module
#1
Hyunjae Lee, Changyeong Song, Yong Seok Hong, Min Sung Kim, Hye Rim Cho, Taegyu Kang, Kwangsoo Shin, Seung Hong Choi, Taeghwan Hyeon, Dae-Hyeong Kim
Electrochemical analysis of sweat using soft bioelectronics on human skin provides a new route for noninvasive glucose monitoring without painful blood collection. However, sweat-based glucose sensing still faces many challenges, such as difficulty in sweat collection, activity variation of glucose oxidase due to lactic acid secretion and ambient temperature changes, and delamination of the enzyme when exposed to mechanical friction and skin deformation. Precise point-of-care therapy in response to the measured glucose levels is still very challenging...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28343103/pd-au-carbon-dots-nanocomposite-facile-synthesis-and-application-as-an-ultrasensitive-electrochemical-biosensor-for-determination-of-colitoxin-dna-in-human-serum
#2
Qitong Huang, Xiaofeng Lin, Jie-Ji Zhu, Qing-Xiao Tong
In this study, a green and fast method was developed to synthesize high-yield carbon dots (CDs) via one-pot microwave treatment of banana peels without using any other surface passivation agents. Then the as-prepared CDs was used as the reducing agent and stabilizer to synthesize a Pd-Au@CDs nanocomposite by a simple sequential reduction strategy. Finally, Pd-Au@CDs nanocomposite modified glassy carbon electrode (Pd-Au@CDs/GCE) was obtained as a biosensor for target DNA after being immobilized a single-stranded probe DNA by a carboxyl ammonia condensation reaction...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28343102/acoustic-and-hybrid-3d-printed-electrochemical-biosensors-for-the-real-time-immunodetection-of-liver-cancer-cells-hepg2
#3
Samar Damiati, Seta Küpcü, Martin Peacock, Christoph Eilenberger, Mazin Zamzami, Ishtiaq Qadri, Hani Choudhry, Uwe B Sleytr, Bernhard Schuster
This study presents an efficient acoustic and hybrid three-dimensional (3D)-printed electrochemical biosensors for the detection of liver cancer cells. The biosensors function by recognizing the highly expressed tumor marker CD133, which is located on the surface of liver cancer cells. Detection was achieved by recrystallizing a recombinant S-layer fusion protein (rSbpA/ZZ) on the surface of the sensors. The fused ZZ-domain enables immobilization of the anti-CD133 antibody in a defined manner. These highly accessible anti-CD133 antibodies were employed as a sensing layer, thereby enabling the efficient detection of liver cancer cells (HepG2)...
March 21, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28342355/pd-nanospheres-decorated-reduced-graphene-oxide-with-multi-functions-highly-efficient-catalytic-reduction-and-ultrasensitive-sensing-of-hazardous-4-nitrophenol-pollutant
#4
A T Ezhil Vilian, Sang Rak Choe, Krishnan Giribabu, Sung-Chan Jang, Changhyun Roh, Yun Suk Huh, Young-Kyu Han
We illustrate a facile approach for in situ synthesis of Pd-gum arabic/reduced graphene oxide (Pd-GA/RGO) using GA as the reducing agent, which favors the instantaneous reduction of both Pd ions and GO into Pd nanoparticles (NPs) and RGO. From the morphological analysis of Pd-GA/RGO, we observed highly dispersed spherical 5nm Pd NPs decorated over RGO. The as-synthesized Pd-GA/RGO composite was employed for the catalytic reduction and the electrochemical detection of 4-nitrophenol (4-NP), respectively. The catalytic reduction of 4-NP was highly pronounced for Pd-GA/RGO (5min) when compared to Pd NPs (140min) and Pd/RGO (36min)...
March 8, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340766/flower-like-mos2-decorated-with-cu2o-nanoparticles-for-non-enzymatic-amperometric-sensing-of-glucose
#5
Linxia Fang, Fan Wang, Zhenghua Chen, Yan Qiu, Tianli Zhai, Mengmeng Hu, Cuijie Zhang, Kejing Huang
In this study, a novel nanohybrid consisting of flower-like MoS2 decorated with Cu2O nanoparticles has been successfully synthesized for non-enzymatic amperometric sensing of glucose. Structural characterizations revealed that Cu2O nanoparticles were highly dispersed on MoS2 nanosheets. Electrochemical performances were investigated by cyclic voltammetry (CV) and chronoamperometry. Compared to single Cu2O component, the-synthesized Cu2O/MoS2 nanohybrid showed superior electrocatalysis to the oxidation of glucose...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340736/highly-sensitive-electrochemical-sensor-for-chloramphenicol-based-on-mof-derived-exfoliated-porous-carbon
#6
Lili Xiao, Ruiyu Xu, Qunhui Yuan, Fu Wang
Benefit from the advantages in costless, simplicity and efficiency, solvent exfoliation has been widely used in preparation of two-dimensional nanosheets with enhanced performances in electronics, photonics, and catalysis. In this work, solvent exfoliation was first applied to prepare exfoliated porous carbon (EPC) from an isoreticular metal-organic framework-8 (IRMOF-8) derived porous carbon (DPC). The obtained EPC with high surface area (1854m(2)g(-1)) and improved dispersibility was used as electrode modifier for glassy carbon electrode (GCE) in square wave voltammetry (SWV) detection of chloramphenicol (CAP)...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340723/an-electrochemical-sensor-device-for-measuring-blood-ammonia-at-the-point-of-care
#7
N T Brannelly, A J Killard
The level of ammonia in blood is relevant in a number of medical conditions. While ammonia is a marker of dysfunction, elevated ammonia is itself a serious medical emergency and can lead to significant and permanent neurological impairment if not addressed quickly. Blood ammonia testing is typically performed in the central laboratory. While a number of point of care devices have been developed, these are based on classical enzymatic or colorimetric principles and have not been widely adopted. In this work, an electrochemical sensor device was developed for measuring blood ammonia...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340711/non-enzymatic-sensors-based-on-in-situ-laser-induced-synthesis-of-copper-gold-and-gold-nano-sized-microstructures
#8
Maxim S Panov, Olga A Vereshchagina, Sergey S Ermakov, Ilya I Tumkin, Evgeniia M Khairullina, Mikhail Yu Skripkin, Andrey S Mereshchenko, Mikhail N Ryazantsev, Vladimir A Kochemirovsky
The synthesis of conductive gold and copper-gold microstructures with high developed surface based on the method of laser-induced metal deposition from solution was developed. The topology and crystallization phase of these structures were observed by means of scanning electron microscopy and X-ray diffraction, respectively. The electrochemical properties of the synthesized materials were investigated using cyclic voltamperometry and amperometry. According to the obtained results, it was found out that copper-gold microstructures demonstrate a linear dependence of Faraday current vs...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28340615/glucocorticoids-induce-production-of-reactive-oxygen-species-reactive-nitrogen-species-and-dna-damage-through-an-inos-mediated-pathway-in-breast-cancer
#9
Renée L Flaherty, Matthew Owen, Aidan Fagan-Murphy, Haya Intabli, David Healy, Anika Patel, Marcus C Allen, Bhavik A Patel, Melanie S Flint
BACKGROUND: Psychological stress increases the circulating levels of the stress hormones cortisol and norepinephrine (NE). Chronic exposure to elevated stress hormones has been linked to a reduced response to chemotherapy through induction of DNA damage. We hypothesize that stress hormone signalling may induce DNA damage through the production of reactive oxygen species (ROS)/reactive nitrogen species (RNS) and interference in DNA repair processes, promoting tumourigenesis. METHODS: Breast cancer cell lines were incubated with physiological levels of cortisol and NE in the presence and absence of receptor antagonists and inducible nitric oxide synthase (iNOS) inhibitors and DNA damage measured using phosphorylated γ-H2AX...
March 24, 2017: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/28340386/constructed-ils-coated-porous-magnetic-nickel-cobaltate-hexagonal-nanoplates-sensing-materials-for-the-simultaneous-detection-of-cumulative-toxic-metals
#10
Yuanyuan Dong, Lei Zhang
The different morphologies of magnetic nickel cobaltate (NiCo2O4) electrocatalysts, consisting of nanoparticles (NiCo2O4-N), nanoplates (NiCo2O4-P) and microspheres (NiCo2O4-S) were fabricated. It was found that the electrocatalytic properties of the sensing materials were strongly dependent on morphology and specific surface area. The porous NiCo2O4 hexagonal nanoplates coupled with ILs as modified materials (ILs@NiCo2O4-P) for the simultaneous determination of thallium (Tl(+)), lead (Pb(2+)) and copper (Cu(2+)), exhibited high sensitivity, long-time stability and good repeatability...
March 18, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28338634/construction-of-an-acetylcholinesterase-sensor-based-on-synthesized-paramagnetic-nanoparticles-a-simple-tool-for-neurotoxic-compounds-assay
#11
Adam Kostelnik, Pavel Kopel, Alexander Cegan, Miroslav Pohanka
Magnetic particles (MPs) have been widely used in biological applications in recent years as a carrier for various molecules. Their big advantage is in repeated use of immobilized molecules including enzymes. Acetylcholinesterase (AChE) is an enzyme playing crucial role in neurotransmission and the enzyme is targeted by various molecules like Alzheimer's drugs, pesticides and warfare agents. In this work, an electrochemical biosensor having AChE immobilized onto MPs and stabilized through glutaraldehyde (GA) molecule was proposed for assay of the neurotoxic compounds...
March 24, 2017: Sensors
https://www.readbyqxmd.com/read/28337914/electrically-actuated-valves-for-woven-fabric-lateral-flow-devices
#12
Tanya Narahari, Dhananjaya Dendukuri, Shashi K Murthy
The integration of flow control elements into low-cost biosensors, presents a significant engineering challenge. This article describes the development and integration of active, chemical valves into lateral flow devices, using a scalable, single-step, weaving-based manufacturing approach. The valve was constructed from an electrically conductive polymer, polypyrrole. The polymer switches between wetting and non-wetting states when it is reduced and oxidized via the application of an electrochemical potential...
March 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28337908/detection-of-2-4-6-trinitrotoluene-using-a-miniaturized-disposable-electrochemical-sensor-with-an-ionic-liquid-gel-polymer-electrolyte-film
#13
Holly A Yu, Junqiao Lee, Simon W Lewis, Debbie Sue Silvester
A new electrochemical method to detect and quantify the explosive compound 2,4,6-trinitrotoluene (TNT) in aqueous solutions is demonstrated. A disposable thin-film electrode modified with a droplet of a gel-polymer electrolyte (GPE) was immersed directly into samples of TNT at concentrations of 1-10 μg/mL. The GPE contained the hydrophobic room temperature ionic liquid (RTIL) trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide ([P14,6,6,6][NTf2]) and the polymer poly(hexyl methacrylate) (PHMA)...
March 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28336878/ag-nanoparticles-modified-3d-graphene-foam-for-binder-free-electrodes-of-electrochemical-sensors
#14
Tao Han, Jianli Jin, Congxu Wang, Youyi Sun, Yinghe Zhang, Yaqing Liu
Ag nanoparticles-modified 3D graphene foam was synthesized through a one-step in-situ approach and then directly applied as the electrode of an electrochemical sensor. The composite foam electrode exhibited electrocatalytic activity towards Hg(II) oxidation with high limit of detection and sensitivity of 0.11 μM and 8.0 μA/μM, respectively. Moreover, the composite foam electrode for the sensor exhibited high cycling stability, long-term durability and reproducibility. These results were attributed to the unique porous structure of the composite foam electrode, which enabled the surface of Ag nanoparticles modified reduced graphene oxide (Ag NPs modified rGO) foam to become highly accessible to the metal ion and provided more void volume for the reaction with metal ion...
February 16, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336869/non-enzymatic-glucose-sensor-composed-of-carbon-coated-nano-zinc-oxide
#15
Ren-Jei Chung, An-Ni Wang, Qing-Liang Liao, Kai-Yu Chuang
Nowadays glucose detection is of great importance in the fields of biological, environmental, and clinical analyzes. In this research, we report a zinc oxide (ZnO) nanorod powder surface-coated with carbon material for non-enzymatic glucose sensor applications through a hydrothermal process and chemical vapor deposition method. A series of tests, including crystallinity analysis, microstructure observation, and electrochemical property investigations were carried out. For the cyclic voltammetric (CV) glucose detection, the low detection limit of 1 mM with a linear range from 0...
February 10, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336068/bioapplications-of-electrochemical-sensors-and-biosensors
#16
Eduard Dumitrescu, Silvana Andreescu
Recent progress in the electrochemical field enabled development of miniaturized sensing devices that can be used in biological settings to obtain fundamental and practical biochemically relevant information on physiology, metabolism, and disease states in living systems. Electrochemical sensors and biosensors have demonstrated potential for rapid, real-time measurements of biologically relevant molecules. This chapter provides an overview of the most recent advances in the development of miniaturized sensors for biological investigations in living systems, with focus on the detection of neurotransmitters and oxidative stress markers...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28336065/folding-and-dynamics-based-electrochemical-dna-sensors
#17
Rebecca Y Lai
A number of electrochemical DNA sensors based on the target-induced change in the conformation and/or flexibility of surface-bound oligonucleotides have been developed in recent years. These sensors, which are often termed E-DNA sensors, are comprised of an oligonucleotide probe modified with a redox label (e.g., methylene blue) at one terminus and attached to a gold electrode via a thiol-gold bond at the other. Binding of the target to the DNA probe changes its structure and dynamics, which, in turn, influences the efficiency of electron transfer to the interrogating electrode...
2017: Methods in Enzymology
https://www.readbyqxmd.com/read/28335573/ultratrace-detection-of-histamine-using-a-molecularly-imprinted-polymer-based-voltammetric-sensor
#18
Maedeh Akhoundian, Axel Rüter, Sudhirkumar Shinde
Rapid and cost-effective analysis of histamine, in food, environmental, and diagnostics research has been of interest recently. However, for certain applications, the already-existing biological receptor-based sensing methods have usage limits in terms of stability and costs. As a result, robust and cost-effective imprinted polymeric receptors can be the best alternative. In the present work, molecularly-imprinted polymers (MIPs) for histamine were synthesized using methacrylic acid in chloroform and acetonitrile as two different porogens...
March 21, 2017: Sensors
https://www.readbyqxmd.com/read/28335500/comparison-of-two-types-of-overoxidized-pedot-films-and-their-application-in-sensor-fabrication
#19
Yun Hui, Chao Bian, Jinfen Wang, Jianhua Tong, Shanhong Xia
Poly(3,4-ethylenedioxythiophene) (PEDOT) films were prepared by electro-oxidation on Au microelectrodes in an aqueous solution. Electrolyte solutions and polymerization parameters were optimized prior to overoxidation. The effect of overoxidation time has been optimized by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), which results in the film overoxidized for 45 s at 1.35 V presenting a strong adsorption. The other one-step overoxidation film prepared by direct CV ranging from -0...
March 19, 2017: Sensors
https://www.readbyqxmd.com/read/28335390/a-simple-metallothionein-based-biosensor-for-enhanced-detection-of-arsenic-and-mercury
#20
Gordon W Irvine, Swee Ngin Tan, Martin J Stillman
Metallothioneins (MTs) are a family of cysteine-rich proteins whose biological roles include the regulation of essential metal ions and protection against the harmful effects of toxic metals. Due to its high affinity for many toxic, soft metals, recombinant human MT isoform 1a was incorporated into an electrochemical-based biosensor for the detection of As(3+) and Hg(2+). A simple design was chosen to maximize its potential in environmental monitoring and MT was physically adsorbed onto paper discs placed on screen-printed carbon electrodes (SPCEs)...
March 13, 2017: Biosensors
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