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https://www.readbyqxmd.com/read/28933756/a-disposable-amperometric-sensor-based-on-high-performance-pedot-pss-ionic-liquid-nanocomposite-thin-film-modified-screen-printed-electrode-for-the-analysis-of-catechol-in-natural-water-samples
#1
Francis D Krampa, Yaw Aniweh, Gordon A Awandare, Prosper Kanyong
A conducting polymer-based composite material of poly(3,4-ethylenedioxythiophene) (PEDOT): poly(4-styrenesulfonate) (PSS) doped with different percentages of a room temperature ionic liquid (IL), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]), was prepared and a very small amount of the composite (2.0 µL) was drop-coated on the working area of a screen-printed carbon electrode (SPCE). The SPCE, modified with PEDOT:PSS/IL composite thin-film, was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), profilometry and sessile contact angle measurements...
July 26, 2017: Sensors
https://www.readbyqxmd.com/read/28926245/hno-is-produced-by-the-reaction-of-no-with-thiols
#2
Sebastian A Suarez, Martina Muñoz, Lucia Alvarez, Mateus F Venancio, Willian Rocha, Damian E Bikiel, Marcelo A Marti, Fabio Doctorovich
Azanone (nitroxyl, HNO) is a highly reactive compound whose biological role is still a matter of debate. One possible route for its formation is NO reduction by biological reductants. These reactions have been historically discarded due to the negative redox potential for the NO,H+/HNO couple. However, the NO to HNO conversion mediated by vitamins C, E and aromatic alcohols has been recently shown to be feasible from a chemical standpoint. Based on these precedents we decided to study the reaction of NO with thiols as potential sources of HNO...
September 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28926059/br%C3%A3-nsted-acidity-in-deep-eutectic-solvents-and-ionic-liquids
#3
Andrew P Abbott, Sahar S M Alabdullah, Azhar Y M Al-Murshedi, Karl S Ryder
Despite the importance of ionic liquids in a variety of fields, little is understood about the behaviour of protons in these media. The main difficulty arises due to the unknown activity of protons in non-aqueous solvents. This study presents acid dissociation constants for nine organic acids in deep eutectic solvents (DESs) using standard pH indicator solutes. The pKIn value for bromophenol blue was found by titrating the DES with triflic acid. The experimental method was developed to understand the acid-base properties of deep eutectic solvents, and through this study it was found that the organic acids studied were slightly less dissociated in the DES than in water with pKa values between 0...
September 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28923558/highly-selective-and-sensitive-sensor-based-on-an-organic-electrochemical-transistor-for-the-detection-of-ascorbic-acid
#4
Lijun Zhang, Guiheng Wang, Di Wu, Can Xiong, Lei Zheng, Yunsheng Ding, Hongbo Lu, Guobing Zhang, Longzhen Qiu
In this study, an organic electrochemical transistor sensor (OECT) with a molecularly imprinted polymer (MIP)-modified gate electrode was prepared for the detection of ascorbic acid (AA). The combination of the amplification function of an OECT and the selective specificity of MIPs afforded a highly sensitive, selective OECT sensor. Cyclic voltammetry and electrochemical impedance spectroscopy measurements were carried out to monitor the stepwise fabrication of the modified electrodes and the adsorption capacity of the MIP/Au electrodes...
September 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28922492/highly-sensitive-detection-of-protein-biomarkers-with-organic-electrochemical-transistors
#5
Ying Fu, Naixiang Wang, Anneng Yang, Helen Ka-Wai Law, Li Li, Feng Yan
The analysis of protein biomarkers is of great importance in the diagnosis of diseases. Although many convenient and low-cost electrochemical approaches have been extensively investigated, they are not sensitive enough in the detection of protein biomarkers with low concentrations in physiological environments. Here, this study reports a novel organic-electrochemical-transistor-based biosensor that can successfully detect cancer protein biomarkers with ultrahigh sensitivity. The devices are operated by detecting electrochemical activity on gate electrodes, which is dependent on the concentrations of proteins labeled with catalytic nanoprobes...
September 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28919435/ultrasensitive-and-rapid-immuno-detection-of-human-ige-anti-therapeutic-horse-sera-using-an-electrochemical-immunosensor
#6
Isis C Prado, André L A Souza, David W Provance-Jr, Ricardo J Cassella, Salvatore G De-Simone
Antivenom allergy disease mediated by patient IgE is an important public health care concern. To improve detection of hypersensitive individuals prior to passive antibody therapy, an amperometric immunosensor was developed to detect reactive human IgE. Whole horse IgG3 (hoIgG3) was immobilized onto the surface of carbon or gold screen-printed electrodes through a cross-linking solution of glutaraldehyde on a chitosan film. Sera from persons with a known allergic response to hoIgG3 or non-allergic individuals was applied to the sensor...
September 14, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28917811/electrochemical-characterization-of-in-situ-functionalized-gold-organosulfur-self-assembled-monolayer-with-conducting-polymer-and-carbon-nanotubes-for-determination-of-rutin
#7
Majid Arvand, Mona Farahpour, Masoomeh Sayyar Ardaki
In this study, attempts were made to present a sensitive strategy for determining rutin. To reach the goal of the study, a poly(sulfosalicylic acid) film was electropolymerized on a gold electrode, which was modified by 2-mercaptobenzothiazole self-assembled monolayer and multi-walled carbon nanotubes (PSSA/CNTs/MBT/Au). The proposed sensor was characterized by different techniques including field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917799/a-reagentless-and-reusable-electrochemical-aptamer-based-sensor-for-rapid-detection-of-ampicillin-in-complex-samples
#8
Zhi-Gang Yu, Rebecca Y Lai
We report the design and fabrication of a "signal-on" electrochemical aptamer-based (E-AB) sensor for detection of ampicillin. The signaling of the sensor is based on target binding-induced changes in the conformation and flexibility of the methylene blue-modified aptamer probe. The sensor's response is fast; signal saturation can be reached in ~ 200s. Since all the sensor components are surface-immobilized, it is regenerable and can be reused for at least three times. It has demonstrated good specificity and is capable of differentiating between ampicillin and structurally similar antibiotics such as amoxicillin...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917796/simultaneous-phase-inversion-and-imprinting-based-sensor-for-highly-sensitive-and-selective-detection-of-bisphenol-a
#9
Qian Yang, Xiaqing Wu, Hailong Peng, Longwen Fu, Xingliang Song, Jinhua Li, Hua Xiong, Lingxin Chen
A novel recognition element of molecularly imprinted films (MIFs) was synthesized by wet phase inversion (WPI) on the surface of Ti/TiO2 electrode for highly selective and sensitive electrochemical detection of bisphenol A (BPA). The Ti/TiO2/MIFs sensor was constructed by casting the precursor poly(acrylonitrile-co-acrylic acid) (p(AN-co-AA)) in dimethyl sulfoxide containing template molecule BPA onto the electrode and then immersing into water, resulting in simultaneous p(AN-co-AA) precipitation and BPA imprinting via the facile WPI...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917792/zno-nanotubes-supported-molecularly-imprinted-polymers-arrays-as-sensing-materials-for-electrochemical-detection-of-dopamine
#10
Hai-Hui Wang, Xuan-Jie Chen, Wei-Tian Li, Wen-Hui Zhou, Xiu-Chun Guo, Wen-Yi Kang, Dong-Xing Kou, Zheng-Ji Zhou, Yue-Na Meng, Qing-Wen Tian, Si-Xin Wu
In this study, ZnO nanotubes (ZNTs) were prepared onto fluorine-doped tin oxide (FTO) glass and used as supports for MIPs arrays fabrication. Due to the imprinted cavities are always located at both inner and outer surface of ZNTs, these ZNTs supported MIPs arrays have good accessibility towards template and can be used as sensing materials for chemical sensors with high sensitivity, excellent selectivity and fast response. Using K3[Fe(CN)6] as electron probe, the fabricated electrochemical sensor shows two linear dynamic ranges (0...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917767/hierarchical-oxygen-implanted-mos2-nanoparticle-decorated-graphene-for-the-non-enzymatic-electrochemical-sensing-of-hydrogen-peroxide-in-alkaline-media
#11
Yudong Xue, Govindhan Maduraiveeran, Mingyong Wang, Shili Zheng, Yi Zhang, Wei Jin
Owing to the extensive applications of hydrogen peroxide (H2O2) in biological, environmental and chemical engineering, it is of great importance to investigate sensitive and selective sensing platform towards the detection of H2O2. Herein, oxygen-implanted MoS2 nanoparticles decorated graphene nanocomposite is synthesized via a facile one-pot solvothermal method for the sensitive detection of H2O2 in alkaline media. The structure and morphology of the MoS2/graphene nanocomposites were systematically characterized, showing that Mo-O bonds are formed and oxygen is implanted into the crystal structure in the nanocomposite...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917761/graphene-nanoribbon-fept-bimetallic-nanoparticles-uric-acid-as-a-novel-magnetic-sensing-layer-of-screen-printed-electrode-for-sensitive-determination-of-ampyra
#12
Pegah Hashemi, Hasan Bagheri, Abbas Afkhami, Salimeh Amidi, Tayyebeh Madrakian
A novel electrochemical sensor for sensitive determination of ampyra (Am) based on graphene nanoribbons modified by iron-platinum bimetallic nanoparticles and uric acid (SPCE/FePtGNR/UA) dropped on the screen-printed carbon electrode (SPCE) surface and magnetically captured onto an SPCE working electrode surface is reported in the present work. The modified nanocomposite and sensing layer was characterized by different techniques, including cyclic voltammetry (CV), linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray powdered diffraction (XRD)...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916103/controlled-synchronized-actuation-of-microdroplets-by-gravity-in-a-superhydrophobic-3d-printed-device
#13
P E Oomen, J P S H Mulder, E Verpoorte, R D Oleschuk
Droplet manipulation over open surfaces allows one to perform assays with a large degree of control and high throughput, making them appealing for applications in drug screening or (bio)analysis. However, the design, manufacturing and operation of these systems comes with high technical requirements. In this study we employ a commercial, low-friction, superhydrophobic coating, Ultra-Ever Dry(®), on a 3D-printed microfluidic device. The device features individual droplet compartments, which allow the manipulation of discrete droplets (10-50 μL) actuated by gravity alone...
October 2, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28916036/determination-of-methotrexate-in-spiked-human-blood-serum-using-multi-frequency-electrochemical-immittance-spectroscopy-and-multivariate-data-analysis
#14
Sereilakhena Phal, Britta Lindholm-Sethson, Paul Geladi, Andrey Shchukarev, Solomon Tesfalidet
This article describes an attempt to develop a sensor based on multi-frequency immittance spectroscopy for the determination of methotrexate (MTX) in blood serum using gold electrodes modified with antibodies. The attachment of antibodies was monitored with electrochemical immittance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). The EIS measurements of MTX resulted in a data matrix of size 39 × 55. The data were analysed using multivariate data analysis and showed a concentration dependence and time dependence that could be separated...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915946/a-hydrogen-peroxide-sensor-based-on-tnm-functionalized-reduced-graphene-oxide-grafted-with-highly-monodisperse-pd-nanoparticles
#15
Sait Bozkurt, Berna Tosun, Betül Sen, Süleyman Akocak, Aysun Savk, Mehmet Faruk Ebeoğlugil, Fatih Sen
Addressed herein, we report the synthesis and characterization of a tert-nonyl mercaptan (TNM) functionalized reduced graphene oxide (rGO) supported palladium (Pd) nanoparticles (NPs) (Pd/TNM@rGO) as electrochemical sensor. The highly monodisperse Pd/TNM@rGO nanocomposite was applied for electrochemical determination of hydrogen peroxide (H2O2) at a potential range of -0.6 to +0.8 V. The Pd/TNM@rGO sensor demonstrated very high activity, sensitivity, reusability and durability toward H2O2 sensing. The well dispersed Pd/TNM@rGO nanocomposite has been characterized by using several analytical techniques such as, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS) and electrochemical impedance spectroscopy (EIS)...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28910866/an-aptamer-based-electrochemical-sensor-that-can-distinguish-influenza-virus-subtype-h1-from-h5
#16
Jin-Moo Lee, JunWon Kim, Ilhwan Ryu, Hye-Min Woo, Tae Gyun Lee, Woong Jung, Sanggyu Yim, Yong-Joo Jeong
The surface protein hemagglutinin (HA) mediates the attachment of influenza virus to host cells containing sialic acid and thus facilitate viral infection. Therefore, HA is considered as a good target for the development of diagnostic tools for influenza virus. Previously, we reported the isolation of single-stranded aptamers that can distinguish influenza subtype H1 from H5. In this study, we described a method for the selective electrical detection of H1 using the isolated aptamer as a molecular probe. After immobilization of the aptamer on Si wafer, enzyme-linked immunosorbent assay (ELISA) and field emission scanning electron microscope (FE-SEM) showed that the immobilized aptamer specifically bound to only the H1 subtype but not the H5 subtype...
September 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28906524/spiers-memorial-lecture-%C3%A2-surface-enhanced-raman-spectroscopy-from-single-particle-molecule-spectroscopy-to-%C3%A3-ngstrom-scale-spatial-resolution-and-femtosecond-time-resolution
#17
Anne-Isabelle Henry, Tyler W Ueltschi, Michael O McAnally, Richard P Van Duyne
Four decades on, surface-enhanced Raman spectroscopy (SERS) continues to be a vibrant field of research that is growing (approximately) exponentially in scope and applicability while pushing at the ultimate limits of sensitivity, spatial resolution, and time resolution. This introductory paper discusses some aspects related to all four of the themes for this Faraday Discussion. First, the wavelength-scanned SERS excitation spectroscopy (WS-SERES) of single nanosphere oligomers (viz., dimers, trimers, etc.), the distance dependence of SERS, the magnitude of the chemical enhancement mechanism, and the progress toward developing surface-enhanced femtosecond stimulated Raman spectroscopy (SE-FSRS) are discussed...
September 14, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28902150/an-electrochemical-low-frequency-seismic-micro-sensor-based-on-mems-with-a-force-balanced-feedback-system
#18
Guanglei Li, Junbo Wang, Deyong Chen, Jian Chen, Lianhong Chen, Chao Xu
Electrochemical seismic sensors are key components in monitoring ground vibration, which are featured with high performances in the low-frequency domain. However, conventional electrochemical seismic sensors suffer from low repeatability due to limitations in fabrication and limited bandwidth. This paper presents a micro-fabricated electrochemical seismic sensor with a force-balanced negative feedback system, mainly composed of a sensing unit including porous sensing micro electrodes immersed in an electrolyte solution and a feedback unit including a feedback circuit and a feedback magnet...
September 13, 2017: Sensors
https://www.readbyqxmd.com/read/28898735/electrochemical-co-preparation-of-cobalt-sulfide-reduced-graphene-oxide-composite-for-electrocatalytic-activity-and-determination-of-h2o2-in-biological-samples
#19
Subbiramaniyan Kubendhiran, Balamurugan Thirumalraj, Shen-Ming Chen, Chelladurai Karuppiah
In this work, we describe a simple approach for the preparation of cobalt sulfide/reduced graphene oxide (CoS/RGO) nanohybrids via single step electrochemical method. The electrocatalytic activity of the CoS/RGO nanohybrids was evaluated towards the detection hydrogen peroxide (H2O2). The physiochemical properties of the prepared composite was characterized by means of field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray powder diffraction patterns...
August 30, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28895397/screen-printed-polyaniline-based-electrodes-for-the-real-time-monitoring-of-lamp-reactions
#20
David Gosselin, Maxime Gougis, Mélissa Baque, Fabrice P Navarro, Mohamed Naceur Belgacem, Didier Chaussy, Anne-Gaelle Bourdat, Pascal Mailley, Jean Berthier
Nucleic acid amplification testing is a very powerful method to perform efficient and early diagnostics. However, the integration of a DNA amplification reaction with its associ-ated detection in a low-cost, portable and autonomous device remains challenging. Addressing this challenge, the use of screen-printed electrochemical sensor is reported. To achieve the detection of the DNA amplification reaction, a real-time monitoring of the hydronium ions concentration, a by-product of this reaction, is performed...
September 12, 2017: Analytical Chemistry
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