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Fast scan cyclic voltammetry

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https://www.readbyqxmd.com/read/28619545/blast-related-disinhibition-and-risk-seeking-in-mice-and-combat-veterans-potential-role-for-dysfunctional-phasic-dopamine-release
#1
A G Schindler, J S Meabon, K F Pagulayan, R C Hendrickson, K D Meeker, M Cline, G Li, C Sikkema, C W Wilkinson, D P Perl, M R Raskind, E R Peskind, J J Clark, D G Cook
Mild traumatic brain injury (mTBI) caused by exposure to high explosives has been called the "signature injury" of the wars in Iraq and Afghanistan. There is a wide array of chronic neurological and behavioral symptoms associated with blast-induced mTBI. However, the underlying mechanisms are not well understood. Here we used a battlefield-relevant mouse model of blast-induced mTBI and in vivo fast-scan cyclic voltammetry (FSCV) to investigate whether the mesolimbic dopamine system contributes to the mechanisms underlying blast-induced behavioral dysfunction...
June 12, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28617576/ex-vivo-measurement-of-electrically-evoked-dopamine-release-in-zebrafish-whole-brain
#2
Mimi Shin, Thomas M Field, Chase S Stucky, Mia N Furgurson, Michael A Johnson
Zebrafish (Danio rerio) have recently emerged as useful model organism for the study of neuronal function. Here, fast-scan cyclic voltammetry at carbon-fiber microelectrodes (FSCV) was used to measure locally-evoked dopamine release and uptake in zebrafish whole brain preparations and results were compared with those obtained from brain slices. Evoked dopamine release ([DA]max) was similar in whole brain and sagittal brain slice preparations (0.49 ± 0.13 µM in whole brain and 0.59 ± 0.28 µM in brain slices)...
June 15, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28605373/modeling-fast-scan-cyclic-voltammetry-data-from-electrically-stimulated-dopamine-neurotransmission-data-using-qnsim1-0
#3
Rashed Harun, Christine M Grassi, Miranda J Munoz, Amy K Wagner
Central dopaminergic (DAergic) pathways have an important role in a wide range of functions, such as attention, motivation, and movement. Dopamine (DA) is implicated in diseases and disorders including attention deficit hyperactivity disorder, Parkinson's disease, and traumatic brain injury. Thus, DA neurotransmission and the methods to study it are of intense scientific interest. In vivo fast-scan cyclic voltammetry (FSCV) is a method that allows for selectively monitoring DA concentration changes with fine temporal and spatial resolution...
June 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28599176/a-highly-sensitive-immunosensor-based-on-ito-thin-films-covered-by-a-new-semi-conductive-conjugated-polymer-for-the-determination-of-tnf%C3%AE-in-human-saliva-and-serum-samples
#4
Elif Burcu Aydın, Muhammet Aydın, Mustafa Kemal Sezgintürk
A novel, ultrasensitive impedimetric immunosensor was constructed for the detection of tumor necrosis factor α (TNFα) by using Poly(3-thiophene acetic acid) (P3), a conjugated polymer as an immobilization matrix. The polymer P3 contains a lot of carboxylic acid groups on its surface that provide a larger biorecognition surface. This developed immunosensor was prepared on hydroxy-bearing ITO surface via an ester bond linkage of polymer P3 to immobilize anti-TNF α antibodies. The ITO electrode modification steps and interaction between anti-TNF α antibody and TNF α antigen were monitored by cyclic voltammetry (CV) and by electrochemical impedance spectroscopy (EIS) method...
June 2, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28597913/inherent-vulnerabilities-in-monoaminergic-pathways-predict-the-emergence-of-depressive-impairments-in-an-animal-model-of-chronic-epilepsy
#5
Jesús-Servando Medel-Matus, Don Shin, Raman Sankar, Andrey Mazarati
The objective was to determine whether the depression comorbid with epilepsy could be predicted based on inherent premorbid patterns of monoaminergic transmission. In male Wistar rats, despair-like and anhedonia-like behaviors were examined using forced swimming and taste preference tests, respectively. Serotonergic raphe nucleus (RN)-prefrontal cortex (PFC) and dopaminergic ventral tegmental area (VTA)-nucleus accumbens (NAcc) pathways were interrogated by fast scan cyclic voltammetry (FSCV). The assays were performed before and 2 months after pilocarpine status epilepticus...
June 9, 2017: Epilepsia
https://www.readbyqxmd.com/read/28594540/noradrenergic-modulation-of-dopamine-transmission-evoked-by-electrical-stimulation-of-the-locus-coeruleus-in-the-rat-brain
#6
Jin W Park, Rohan V Bhimani, Jinwoo Park
Central norepinephrine (NE) and dopamine (DA) are involved in a variety of physiological functions and behaviors. Accumulating evidence suggests that NE neurons originating from the locus coeruleus (LC) innervate DA neurons of the ventral tegmental area (VTA) and influence VTA-DA neural activity. However, the underlying mechanisms of how LC-NE regulates DA transmission via VTA-DA neurons remain largely unexplored. Herein, we investigated how electrical stimulation of the LC modulates VTA-DA neurotransmission in the nucleus accumbens (NAc)...
June 21, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28593190/nucleus-accumbens-shell-dopamine-preferentially-tracks-information-related-to-outcome-value-of-reward
#7
Deirdre A Sackett, Michael P Saddoris, Regina M Carelli
Effective decision-making requires organisms to predict reward values and bias behavior toward the best available option. The mesolimbic dopamine system, including the nucleus accumbens (NAc) shell and core, is involved in this process. Although studies support a role of the shell and core in specific aspects of decision-making (e.g., risk, effort, delay), no studies have directly compared dopamine release dynamics in these subregions to cues exclusively signaling the availability of different reward magnitudes...
May 2017: ENeuro
https://www.readbyqxmd.com/read/28589201/magnesia-stabilised-zirconia-solid-electrolyte-assisted-electrochemical-investigation-of-iron-ions-in-a-sio2-cao-mgo-al2o3-molten-slag-at-1723-k
#8
Yunming Gao, Chuanghuang Yang, Canlei Zhang, Qingwei Qin, George Z Chen
Production of metallic iron through molten oxide electrolysis using inert electrodes is an alternative route for fast ironmaking without CO2 emissions. The fact that many inorganic oxides melt at ultrahigh temperatures (>1500 K) challenges conventional electro-analytical techniques used in aqueous, organic and molten salt electrolytes. However, in order to design a feasible and effective electrolytic process, it is necessary to best understand the electrochemical properties of iron ions in molten oxide electrolytes...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28531297/mechanisms-of-kappa-opioid-receptor-potentiation-of-dopamine-d2-receptor-function-in-quinpirole-induced-locomotor-sensitization-in-rats
#9
Angélica P Escobar, Marcela P González, Rodrigo C Meza, Verónica Noches, Pablo Henny, Katia Gysling, Rodrigo A España, José A Fuentealba, María E Andrés
Background: Increased locomotor activity in response to the same stimulus is an index of behavioral sensitization observed in preclinical models of drug addiction and compulsive behaviors. Repeated administration of Quinpirole (QNP), a D2/D3 dopamine agonist, induces locomotor sensitization. This effect is potentiated and accelerated by co-administration of U69593, a kappa opioid receptor agonist (KOR). The mechanism underlying KOR potentiation of QNP-induced locomotor sensitization remains to be elucidated...
May 22, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28530394/electrogeneration-of-gold-nanoparticles-on-porous-carbon-paper-based-electrodes-and-application-to-inorganic-arsenic-analysis-in-white-wines-by-chronoamperometric-stripping
#10
Estefanía Nunez-Bajo, M Carmen Blanco-López, Agustín Costa-García, M Teresa Fernández-Abedul
This paper describes the development of simple, sustainable, and low-cost strategies for signal enhancement on paper-based carbon platforms through gold nanoparticles electrogenerated from small volumes of tetrachloroauric (III) acid solutions. Carbon ink is deposited on a hydrophilic working area of the paper delimited with hydrophobic wax. This maskless procedure is fast and cuts down ink waste. The connection of this working electrode to the potentiostat is ensured with the use of screen-printed electrodes (SPEs)...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28498499/heterogeneous-extracellular-dopamine-regulation-in-the-subregions-of-the-olfactory-tubercle
#11
Jinwoo Park, Ken T Wakabayashi, Caitlin Szalkowski, Rohan V Bhimani
Recent studies show that dense dopamine (DA) innervation from the ventral tegmental area (VTA) to the olfactory tubercle (OT) may play an important role in processing multisensory information pertaining to arousal and reward, yet little is known about DA regulation in the OT. This is mainly due to the anatomical limitations of conventional methods of determining DA dynamics in small heterogeneous OT subregions located in the ventral most part of the brain. Additionally, there is increasing awareness that anteromedial and anterolateral subregions of the OT have distinct functional roles in natural and psychostimulant drug reinforcement as well as in regulating other types of behavioral responses, such as aversion...
May 12, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28488873/removal-of-differential-capacitive-interferences-in-fast-scan-cyclic-voltammetry
#12
Justin A Johnson, Caddy N Hobbs, R Mark Wightman
Due to its high spatiotemporal resolution, fast-scan cyclic voltammetry (FSCV) at carbon-fiber microelectrodes enables the localized in vivo monitoring of subsecond fluctuations in electroactive neurotransmitter concentrations. In practice, resolution of the analytical signal relies on digital background subtraction for removal of the large current due to charging of the electrical double layer as well as surface faradaic reactions. However, fluctuations in this background current often occur with changes in the electrode state or ionic environment, leading to nonspecific contributions to the FSCV data that confound data analysis...
June 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28486408/fabrication-of-a-novel-highly-sensitive-and-selective-immunosensor-for-botulinum-neurotoxin-serotype-a-based-on-an-effective-platform-of-electrosynthesized-gold-nanodendrites-chitosan-nanoparticles
#13
Rahim Sorouri, Hasan Bagheri, Abbas Afkhami, Jafar Salimian
In this work, a novel nanocomposite consisting of electrosynthesized gold nanodendrites and chitosan nanoparticles (AuNDs/CSNPs) has been prepared to fabricate an impedimetric immunosensor based on a screen printed carbon electrode (SPCE) for the rapid and sensitive immunoassay of botulinum neurotoxin A (BoNT/A). BoNT/A polyclonal antibody was immobilized on the nanocomposite-modified SPCE for the signal amplification. The structure of the prepared nanocomposite was investigated by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS)...
May 9, 2017: Sensors
https://www.readbyqxmd.com/read/28482543/self-assembly-of-glucose-oxidase-on-reduced-graphene-oxide-magnetic-nanoparticles-nanocomposite-based-direct-electrochemistry-for-reagentless-glucose-biosensor
#14
Saithip Pakapongpan, Rungtiva P Poo-Arporn
A novel approach of the immobilization of a highly selective and stable glucose biosensor based on direct electrochemistry was fabricated by a self-assembly of glucose oxidase (GOD) on reduced graphene oxide (RGO) covalently conjugated to magnetic nanoparticles (Fe3O4 NPs) modified on a magnetic screen-printed electrode (MSPE). The RGO-Fe3O4 nanocomposite has remarkable enhancement in large surface areas, is favorable environment for enzyme immobilization, facilitates electron transfer between enzymes and electrode surfaces and possesses superparamagnetism property...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28458131/eggshell-membrane-templated-synthesis-of-3d-hierarchical-porous-au-networks-for-electrochemical-nonenzymatic-glucose-sensor
#15
Shu-Lin Zhong, Junyang Zhuang, Da-Peng Yang, Dianping Tang
Sensitive and accurate test of blood glucose levels is necessary to monitor and prevent diabetic complications. Herein, we developed a novel and sensitive non-enzymatic glucose sensing platform by employing 3D hierarchical porous Au networks (HPANs) as electrocatalyst for glucose oxidization. The HPANs were prepared through a bio-inspired synthesis method, in which the natural eggshell membrane (ESM) was introduced as template. The structure and properties of the as-prepared HPANs were characterized by a set of techniques, including scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD) and cyclic voltammetry (CV)...
April 26, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28452196/template-and-additive-free-electrosynthesis-and-characterization-of-spherical-gold-nanoparticles-on-hydrophobic-conducting-polydimethylsiloxane
#16
Saurav Kumar Guin, Peter Knittel, Sven Daboss, Anton Breusow, Christine Kranz
Carbon-doped poly(dimethylsiloxane) (C-PDMS) modified with gold nanoparticles (AuNPs) is a highly promising material for the development of flexible lab-on-chip biosensors. Here, we present an electrochemical method to prepare stabilizer-free AuNPs directly on hydrophobic conducting substrates like C-PDMS without physical or chemical pre-treatment of the C-PDMS substrate. Using a potentiostatic triple pulse strategy, spherical, non-stabilized AuNPs of diameter 78 ± 5 nm could be deposited within 5 s with very narrow size-dispersion on the hydrophobic C-PDMS substrate in the absence of any structure directing or stabilizing agent...
April 27, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28445595/ventricular-fibrillation-cardiac-arrest-produces-a-chronic-striatal-hyperdopaminergic-state-that-is-worsened-by-methylphenidate-treatment
#17
Gerald J Nora, Rashed Harun, David F Fine, Daniel Hutchison, Adam C Grobart, Jason P Stezoski, Miranda Munoz, Patrick M Kochanek, Rehana K Leak, Tomas Drabek, Amy K Wagner
Cardiac arrest survival rates have improved with modern resuscitation techniques, but many survivors experience impairments associated with hypoxic-ischemic brain injury. Currently, little is understood about chronic changes in striatal dopamine (DA) systems after hypoxic-ischemic brain injury. Given the common empiric clinical use of DA enhancing agents in neurorehabilitation, investigation evaluating dopaminergic alterations after cardiac arrest (CA) is necessary to optimize rehabilitation approaches. We hypothesized that striatal DA neurotransmission would be altered chronically after ventricular fibrillation cardiac arrest (VF-CA)...
April 26, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28429831/one-step-fabrication-of-monolithic-electrodes-comprising-co9-s8-particles-supported-on-cobalt-foam-for-efficient-and-durable-oxygen-evolution-reaction
#18
Dehua Xiong, Qingqing Zhang, Sitaramanjaneya Mouli Thalluri, Junyuan Xu, Wei Li, Xiuli Fu, Lifeng Liu
A very easy and cost-effective approach to the fabrication of monolithic Co9 S8 water oxidation electrodes (Co@Co9 S8 ), fabricated by one-step hydrothermal treatment of commercially available cobalt foam in the presence of thiourea, is reported. The morphology, crystal structure, microstructure, and composition of as-fabricated Co@Co9 S8 electrodes were examined by using scanning electron microscopy (SEM), powder X-ray diffractometry (XRD), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS), and their electrochemical properties were investigated by cyclic voltammetry (CV), chronopotentiometry (CP), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS)...
April 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28415435/developing-an-electrochemical-sensor-based-on-a-carbon-paste-electrode-modified-with-nano-composite-of-reduced-graphene-oxide-and-cufe2o4-nanoparticles-for-determination-of-hydrogen-peroxide
#19
Ali Benvidi, Mohammad Taghi Nafar, Shahriar Jahanbani, Marzieh Dehghan Tezerjani, Masoud Rezaeinasab, Sudabeh Dalirnasab
In this paper, a highly sensitive voltammetric sensor based on a carbon paste electrode with CuFe2O4 nanoparticle (RGO/CuFe2O4/CPE) was designed for determination of hydrogen peroxide (H2O2). The electrocatalytic reduction of H2O2 was examined using various techniques such as cyclic voltammetry (CV), chronoamperometry, amperometry and differential pulse voltammetry (DPV). CuFe2O4 nanoparticles were synthesized by co-precipitation method and characterized with scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) techniques...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28366206/evaluation-of-carbon-nanotube-fiber-microelectrodes-for-neurotransmitter-detection-correlation-of-electrochemical-performance-and-surface-properties
#20
Cheng Yang, Elefterios Trikantzopoulos, Christopher B Jacobs, B Jill Venton
Fibers made of CNTs are attractive microelectrode sensors because they can be directly fabricated into microelectrodes. Different protocols for making CNT fibers have been developed, but differences in surface structure and therefore electrochemical properties that result have not been studied. In this study, we correlated the surface and electrochemical properties for neurochemical detection at 3 types of materials: CNT fibers produced by wet spinning with (1) polyethylenimine (PEI/CNT) or (2) chlorosulfonic acid (CA/CNT), and (3) CNT yarns made by solid-based CNT drawing...
May 1, 2017: Analytica Chimica Acta
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