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https://www.readbyqxmd.com/read/28735044/sensing-platform-for-neuron-specific-enolase-based-on-molecularly-imprinted-polymerized-ionic-liquids-in-between-gold-nanoarrays
#1
Xing Wang, Yanying Wang, Xiaoxue Ye, Tsunghsueh Wu, Hongping Deng, Peng Wu, Chunya Li
A molecularly imprinted electrochemical sensor for neuron specific enolase (NSE) was developed by electrochemical polymerizing ionic liquid, which was functionalized with pyrrole moiety, in between gold nanoarrays. A well-defined 3D structured gold nanoarray was fabricated on a glassy carbon electrode (GCE) surface by using template-assisted electrochemical deposition technique. 1-(3-mercaptopropyl)-3-vinyl-imidazolium tetrafluoroborate was self-assembled onto the surface of gold nanoarrays to produce active sites for anchoring the molecularly imprinted film...
July 14, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28734366/a-label-free-genetic-biosensor-for-diabetes-based-on-aunps-decorated-ito-with-electrochemiluminescent-signaling
#2
Suyan Zhai, Chen Fang, Jilin Yan, Qun Zhao, Yifeng Tu
The variation of I27L gene closely relates to increasing risk of type 2 diabetes, thus it is greatly significant to develop various methods for its identification or monitoring. We report here a novel label-free electrochemiluminescent (ECL) biosensor for simple and effective determination of I27L gene based on Au nanoparticles functionalized ITO electrode. The ECL technique is employed to monitor the hybridization of DNA strands by measuring the changes of its intensity. Here, the ECL signal was quenched by blocked access of probe (luminol anion) owing to the electrostatic repulsion of negatively charged sensor surface and the space resistance...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28734357/ysz-based-sensor-using-cr-fe-based-spinel-oxide-electrodes-for-selective-detection-of-co
#3
Sri Ayu Anggraini, Yuki Fujio, Hiroshi Ikeda, Norio Miura
A selective carbon monoxide (CO) sensor was developed by the use of both of CuCrFeO4 and CoCrFeO4 as the sensing electrode (SE) for yttria-stabilized zirconia (YSZ)-based potentiometric sensor. The sensing-characteristic examinations of the YSZ-based sensors using each of spinel oxides as the single-SE sensor showed that CuCrFeO4-SE had the ability to detect CO, hydrocarbons and NOx gases, while CoCrFeO4-SE was sensitive to hydrocarbons and NOx gases. Thus, when both SEs were paired as a combined-SEs sensor, the resulting sensor could generate a selective response to CO at 450 °C under humid conditions...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28732957/sonochemical-synthesis-of-silver-nanoparticles-anchored-reduced-graphene-oxide-nanosheets-for-selective-and-sensitive-detection-of-glutathione
#4
Victor Vinoth, Jerry J Wu, Abdullah M Asiri, Sambandam Anandan
Developed here an eco-friendly, one-pot approach toward rapid synthesis of silver nanoparticles anchored reduced graphene oxide (AgNPs(TMSPED)-rGO) nanosheets via sonochemical irradiation method, using an aqueous solution mixture of GO and AgNO3 in the presence of N-[3(trimethoxysilyl)propyl] ethylenediamine (TMSPED) without any reducing agent. As synthesized decorated nanosheets was thoroughly characterized by transmission electron microscopy (TEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) spectroscopy, Raman spectroscopy and X-ray photoelectron spectroscopy (XPS)...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28732155/relating-redox-properties-of-polyvinylamine-g-tempo-laccase-hydrogel-complexes-to-cellulose-oxidation
#5
Qiang Fu, Alexander Sutherland, Emil Gustafsson, Md Monsur Ali, Leyla Soleymani, Robert H Pelton
The structure and electrochemical properties of adsorbed complexes based on mixtures of polyvinylamine-g-TEMPO (PVAm-T) and laccase were related to the ability of the adsorbed complexes to oxidize cellulose. PVAm-T10 with 10% of the amines bearing TEMPO moieties (i.e. DS= 10%), adsorbed onto gold-sulfonate EQCM-D sensor surfaces giving a hydrogel film, 7 nm thick, 89% water and encasing laccase (200 mM) and TEMPO moieties (33 mM). For DS values >10% all of the TEMPOs in the hydrogel film were redox-active, in that they could be oxidized by the electrode...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28731116/liquid-exfoliation-of-2d-mos2-nanosheets-and-their-utilization-as-a-label-free-electrochemical-immunoassay-for-subclinical-ketosis
#6
Satish K Tuteja, Todd Duffield, Suresh Neethirajan
We report the step-by-step fabrication of a 2D MoS2 nanostructure-based disposable electrochemical immunosensor to detect β-hydroxybutyrate (βHBA), a novel subclinical ketosis biomarker. The MoS2 nanosheets were exfoliated in the liquid phase by ultrasonication, and then followed by deposition on gold colloid modified screen-printed electrodes (Au-SPE). The MoS2-modified electrodes were thoroughly characterized by physical, electrochemical as well as spectroscopic techniques, and the obtained results indicate the successful and irreversible electrodeposition of MoS2 nanosheets...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730812/potential-scanning-localized-plasmon-sensing-with-single-and-coupled-gold-nanorods
#7
Tokuhisa Kawawaki, Heyou Zhang, Hiroyasu Nishi, Paul Mulvaney, Tetsu Tatsuma
Single plasmonic nanoparticles can potentially serve as optical sensors for detecting local refractive index changes. However, simultaneous monitoring of the scattering spectra from multiple nanoparticles is not practical. Here we perform potential-scanning localized surface plasmon resonance (LSPR) sensing. Gold nanorods are immobilized on an ITO electrode. Instead of collecting the full spectrum, as is done in conventional LSPR sensing, the electrode potential is scanned while the rod spectra are monitored at a single wavelength...
July 21, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28730804/wearable-and-transparent-capacitive-strain-sensor-with-high-sensitivity-based-on-patterned-ag-nanowire-networks
#8
Seung-Rok Kim, Jin-Hoon Kim, Jin-Woo Park
In this study, a transparent and stretchable thin-film capacitive strain sensor based on patterned Ag nanowire networks (AgNWs) was successfully fabricated. The AgNWs were patterned using a capillary force lithography (CFL) method and were embedded onto the surface of the polydimethylsiloxane (PDMS) substrate. The strain (ε) sensitivity of the capacitive strain sensor was controlled and enhanced by patterning the AgNWs into electrodes with an interdigitated shape. Interdigitated capacitive strain sensor (ICSS) is expected to have -1...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28729901/aptamer-functionalized-neural-recording-electrodes-for-the-direct-measurement-of-cocaine-in-vivo
#9
I Mitch Taylor, Zhanhong Du, Emma T Bigelow, James R Eles, Anthony R Horner, Kasey A Catt, Stephen G Weber, Brian G Jamieson, X Tracy Cui
Cocaine is a highly addictive psychostimulant that acts through competitive inhibition of the dopamine transporter. In order to fully understand the region specific neuropathology of cocaine abuse and addiction, it is unequivocally necessary to develop cocaine sensing technology capable of directly measuring real-time cocaine transient events local to different brain regions throughout the pharmacokinetic time course of exposure. We have developed an electrochemical aptamer-based in vivo cocaine sensor on a silicon based neural recording probe platform capable of directly measuring cocaine from discrete brain locations using square wave voltammetry (SWV)...
April 7, 2017: Journal of Materials Chemistry. B, Materials for Biology and Medicine
https://www.readbyqxmd.com/read/28729810/the-interplay-of-electrode-and-bio-materials-in-a-redox-cycling-based-clozapine-sensor
#10
Thomas E Winkler, Robert Dietrich, Eunkyoung Kim, Hadar Ben-Yoav, Deanna L Kelly, Gregory F Payne, Reza Ghodssi
We investigate gold, TiN, and platinum in combination with a chitosan-catechol-based redox-cycling system (RCS) for electrochemical detection of the antipsychotic clozapine. We have previously demonstrated the RCS for detection of clozapine in serum, but challenges remain regarding low signal-to-noise ratios. This can be mitigated by selection of electrode materials with beneficial surface morphologies and/or compositions. We employ cyclic voltammetry to assess the redox current generated by clozapine, and differentiate solely surface-area-based effects from clozapine-specific ones using a standard redox couple...
June 2017: Electrochemistry Communications
https://www.readbyqxmd.com/read/28727416/in-situ-electrochemical-sensing-and-real-time-monitoring-live-cells-based-on-freestanding-nanohybrid-paper-electrode-assembled-from-3d-functionalized-graphene-framework
#11
Yan Zhang, Jian Xiao, Qi-Ying Lv, Lu Wang, Xulin Dong, Muhammad Asif, Jinghua Ren, Wenshan He, Yimin Sun, Fei Xiao, Shuai Wang
In this work, we develop a new type of freestanding nanohybrid paper electrode assembled from 3D ionic liquid (IL) functionalized graphene framework (GF) decorated by gold nanoflowers (AuNFs), and explore its practical application in in-situ electrochemical sensing of live breast cell samples by real-time tracking biomarker H2O2 released from cells. The AuNFs modified IL functionalized GF (AuNFs/IL-GF) was synthesized via a facile and efficient dopamine assisted one-pot self-assembly strategy. The as-obtained nanohybrid assembly exhibits a typical 3D hierarchical porous structure, where the highly active electrocatalyst AuNFs are well dispersed on IL-GF scaffold...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28727018/evaluation-of-electrical-broad-bandwidth-impedance-spectroscopy-as-a-tool-for-body-composition-measurement-in-cows-in-comparison-with-body-measurements-and-the-deuterium-oxide-dilution-method
#12
C T Schäff, U Pliquett, A Tuchscherer, R Pfuhl, S Görs, C C Metges, H M Hammon, C Kröger-Koch
Body fatness and degree of body fat mobilization in cows vary enormously during their reproduction cycle and influence energy partitioning and metabolic adaptation. The objective of the study was to test bioelectrical impedance spectroscopy (BIS) as a method for predicting fat depot mass (FDM), in living cows. The FDM is defined as the sum of subcutaneous, omental, mesenteric, retroperitoneal, and carcass fat mass. Bioelectrical impedance spectroscopy is compared with the prediction of FDM from the deuterium oxide (DO) dilution method and from body conformation measurements...
May 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28726727/in-vitro-quantified-determination-of-%C3%AE-amyloid-42-peptides-a-biomarker-of-neuro-degenerative-disorders-in-pbs-and-human-serum-using-a-simple-cost-effective-thin-gold-film-biosensor
#13
Yifan Dai, Alireza Molazemhosseini, Chung Chiun Liu
A simple in vitro biosensor for the detection of β-amyloid 42 in phosphate-buffered saline (PBS) and undiluted human serum was fabricated and tested based on our platform sensor technology. The bio-recognition mechanism of this biosensor was based on the effect of the interaction between antibody and antigen of β-amyloid 42 to the redox couple probe of K₄Fe(CN)₆ and K₃Fe(CN)₆. Differential pulse voltammetry (DPV) served as the transduction mechanism measuring the current output derived from the redox coupling reaction...
July 20, 2017: Biosensors
https://www.readbyqxmd.com/read/28726672/the-influence-of-surface-potential-on-the-optical-switching-of-spiropyran-self-assembled-monolayers
#14
Tobias Garling, Yujin Tong, Tamim Darwish, Martin Wolf, R Kramer Campen
Surfaces whose macroscopic properties can be switched by light are potentially useful in a wide variety of applications. One such promising application is electrochemical sensors that can be gated by optically switching the electrode <i>on</i> or <i>off</i>. One way to make such a switchable electrode is by depositing a self-assembled monolayer of bistable, optically switchable molecules onto an electrode surface. Quantitative application of any such sensor requires understanding how changes in interfacial field affect the composition of photostationary states, <i>i...
July 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28726079/bilirubin-enzyme-biosensor-potentiality-and-recent-advances-towards-clinical-bioanalysis
#15
REVIEW
Vinita Hooda, Anjum Gahlaut, Ashish Gothwal, Vikas Hooda
Bilirubin detection plays a major role in healthcare. Its high concentration in human serum is lethal and must be determined accurately. Clinically, it is vital for assessing patients with deleterious health conditions such as jaundice or icterus, hepatitis, mental disorders, cerebral palsy and brain damage especially in the case of neonates. In evaluating the drawbacks regarding the conventional methodology of bilirubin detection, there is need for a superior analytical tool. Bilirubin oxidase (BOx)-based sensors have been designed for the ultrasensitive analysis of bilirubin and quality deliverance of treatment and this review highlights the different mechanisms of bilirubin detection using different modified electrodes...
July 19, 2017: Biotechnology Letters
https://www.readbyqxmd.com/read/28726002/ultrasound-guided-radiofrequency-ablation-using-a-new-electrode-with-an-electromagnetic-position-sensor-for-hepatic-tumors-difficult-to-place-an-electrode-a-preliminary-clinical-study
#16
Tae Wook Kang, Min Woo Lee, Kyoung Doo Song, Hyunchul Rhim, Hyo Keun Lim, Wonseok Kang, Kyunga Kim
PURPOSE: To evaluate whether a new electrode embedded with an electromagnetic position sensor (EMPS) improves the technical feasibility of percutaneous radiofrequency ablation (RFA) in patients with hepatic tumors difficult to place an electrode under ultrasonography (US) guidance and to assess short-term therapeutic efficacy and safety. MATERIALS AND METHODS: This prospective study was approved by the institutional review board, and written informed consent was obtained from all patients...
July 19, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28725890/one-step-synthesis-of-novel-cu-polymer-nanocomposites-through-a-self-activated-route-and-their-application-as-nonenzymatic-glucose-sensors
#17
Yinlin Tong, Jiaying Xu, Hong Jiang, Feng Gao, Qingyi Lu
In this study, we developed a one-step self-activated route for synthesizing novel core-shell Cu@polymer nanocomposites. Under solvothermal conditions, Cu(2+) was reduced to metal copper by formaldehyde and salicylaldehyde and the newly generated copper crystals acted as the catalysts to activate the condensation polymerization between formaldehyde and salicylaldehyde, resulting in the formation of core-shell Cu@polymer nanocomposites with Cu nanoparticles as the cores and polymer as the shells. The Cu@polymer nanocomposites can be applied as a nonenzymatic sensor for glucose detection...
July 20, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28725175/how-different-eeg-references-influence-sensor-level-functional-connectivity-graphs
#18
Yunzhi Huang, Junpeng Zhang, Yuan Cui, Gang Yang, Ling He, Qi Liu, Guangfu Yin
Highlights: Hamming Distance is applied to distinguish the difference of functional connectivity networkThe orientations of sources are testified to influence the scalp Functional Connectivity Graph (FCG) from different references significantlyREST, the reference electrode standardization technique, is proved to have an overall stable and excellent performance in variable situations. The choice of an electroencephalograph (EEG) reference is a practical issue for the study of brain functional connectivity. To study how EEG reference influence functional connectivity estimation (FCE), this study compares the differences of FCE resulting from the different references such as REST (the reference electrode standardization technique), average reference (AR), linked mastoids (LM), and left mastoid references (LR)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28725015/all-printed-highly-sensitive-2d-mos2-based-multi-reagent-immunosensor-for-smartphone-based-point-of-care-diagnosis
#19
Memoon Sajid, Ahmed Osman, Ghayas Uddin Siddiqui, Hyun Bum Kim, Soo Wan Kim, Jeong Bum Ko, Yoon Kyu Lim, Kyung Hyun Choi
Immunosensors are used to detect the presence of certain bio-reagents mostly targeted at the diagnosis of a condition or a disease. Here, a general purpose electrical immunosensor has been fabricated for the quantitative detection of multiple bio-reagents through the formation of an antibody-antigen pair. The sensors were fabricated using all printing approaches. 2D transition metal dichalcogenide (TMDC) MoS2 thin film was deposited using Electrohydrodynamic atomization (EHDA) on top of an interdigitated transducer (IDT) electrode fabricated by reverse offset printing...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28725000/trivalent-y-3-ionic-sensor-development-based-on-e-methyl-n-nitrobenzylidene-benzenesulfonohydrazide-mnbbsh-derivatives-modified-with-nafion-matrix
#20
Mohammad Musarraf Hussain, Mohammed M Rahman, Muhammad Nadeem Arshad, Abdullah M Asiri
(E)-Methyl-N'-nitrobenzylidene-benzenesulfonohydrazide (MNBBSH) compounds were synthesized using a condensation procedure from the derivatives of nitrobenzaldehyde and 4-Methyl-benzenesulfonylhydrazine, which crystallized in ethanol and methanol as well as characterized by FTIR, UV-Vis, (1)H-NMR, and (13)C-NMR. MNBBSH structure was confirmed using a single crystal X-ray diffraction technique and used for the detection of selective yttrium ion (Y(3+)) by I-V system. A thin layer of MNBBSH was deposited onto a glassy carbon electrode (GCE) with 5% nafion for the sensitive and selective Y(3+) sensor...
July 19, 2017: Scientific Reports
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