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https://www.readbyqxmd.com/read/28922492/highly-sensitive-detection-of-protein-biomarkers-with-organic-electrochemical-transistors
#1
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/28920906/clotchip-a-microfluidic-dielectric-sensor-for-point-of-care-assessment-of-hemostasis
#2
Debnath Maji, Michael A Suster, Erdem Kucukal, Ujjal D S Sekhon, Anirban Sen Gupta, Umut A Gurkan, Evi X Stavrou, Pedram Mohseni
This paper describes the design, fabrication, and testing of a microfluidic sensor for dielectric spectroscopy of human whole blood during coagulation. The sensor, termed ClotChip, employs a three-dimensional, parallel-plate, capacitive sensing structure with a floating electrode integrated into a microfluidic channel. Interfaced with an impedance analyzer, the ClotChip measures the complex relative dielectric permittivity, ϵ Tr, of human whole blood in the frequency range of 40 Hz to 100 MHz. The temporal variation in the real part of the blood dielectric permittivity at 1 MHz features a time to reach a permittivity peak, Tpeak, as well as a maximum change in permittivity after the peak, ∆εr,max, as two distinct parameters of ClotChip readout...
September 12, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28919435/ultrasensitive-and-rapid-immuno-detection-of-human-ige-anti-therapeutic-horse-sera-using-an-electrochemical-immunosensor
#3
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/28917993/nonsedated-handheld-electroretinogram-as-a-screening-test-of-retinal-dysfunction-in-pediatric-patients-with-nystagmus
#4
Sara F Grace, Byron L Lam, William J Feuer, Carla J Osigian, Kara M Cavuoto, Hilda Capo
PURPOSE: To assess the feasibility, sensitivity, and specificity of nonsedated handheld cone flicker electroretinogram (ERG) as a screening tool to detect retinal dysfunction in children with nystagmus. METHODS: Pediatric patients at a tertiary referral center from December 2015 to July 2016 were enrolled and placed into three age-matched groups: normal, nystagmus with a retinal dystrophy, and nystagmus without a retinal dystrophy. Unsedated 30 Hz cone flicker ERG responses were obtained using a handheld device (RETeval) from both eyes of each patient using skin electrode sensors after pupillary dilation...
September 13, 2017: Journal of AAPOS: the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
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
#5
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/28917796/simultaneous-phase-inversion-and-imprinting-based-sensor-for-highly-sensitive-and-selective-detection-of-bisphenol-a
#6
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/28917761/graphene-nanoribbon-fept-bimetallic-nanoparticles-uric-acid-as-a-novel-magnetic-sensing-layer-of-screen-printed-electrode-for-sensitive-determination-of-ampyra
#7
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/28917742/analysis-of-glutathione-in-the-presence-of-acetaminophen-and-tyrosine-via-an-amplified-electrode-with-mgo-swcnts-as-a-sensor-in-the-hemolyzed-erythrocyte
#8
Fahimeh Tahernejad-Javazmi, Mehdi Shabani-Nooshabadi, Hassan Karimi-Maleh
In this study, we investigated the effect of adding MgO/SWCNTs and 2-Chloro-N'-[1-(2,5-dihydroxyphenyl) methylidene]aniline (2-CDHPMA) to a carbon paste matrix, which could act as a voltammetric sensor for the analysis of glutathione. The electrocatalytic interaction between 2-CDHPMA and glutathione was used as a factor for the analysis of this biological compound in real samples. In addition, the presence of MgO/SWCNTs can help in increasing the sensitivity of the fabricated sensor and for obtaining a low limit of detection in the analysis of glutathione...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917737/3-4-diaminotoluene-sensor-development-based-on-hydrothermally-prepared-mncoxoy-nanoparticles
#9
Mohammed M Rahman, M M Alam, Abdullah M Asiri, M A Islam
A facile hydrothermal process was used to prepare MnCoxOy nanoparticles (NPs) in alkaline medium (pH~10.5) at room temperature. The NPs were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet visible spectroscopy (UV/vis), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), and powder X-ray diffraction (XRD). A thin layer of NPs film as a chemical sensor was fabricated on a glassy carbon electrode (GCE) with the help of a conducting binder...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917732/staying-alive-sensors-used-for-monitoring-cell-health-in-bioreactors
#10
REVIEW
P O'Mara, A Farrell, J Bones, K Twomey
Current and next generation sensors such as pH, dissolved oxygen (dO) and temperature sensors that will help drive the use of single-use bioreactors in industry are reviewed. The current trend in bioreactor use is shifting from the traditional fixed bioreactors to the use of single-use bioreactors (SUBs). However as the shift in paradigm occurs there is now a greater need for sensor technology to play 'catch up' with the innovation of bioreactor technology. Many of the sensors still in use today rely on technology created in the 1960's such as the Clark-type dissolved oxygen sensor or glass pH electrodes...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916036/determination-of-methotrexate-in-spiked-human-blood-serum-using-multi-frequency-electrochemical-immittance-spectroscopy-and-multivariate-data-analysis
#11
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/28916033/ca-2-detection-utilising-algan-gan-transistors-with-ion-selective-polymer-membranes
#12
Mohsen Asadnia, Matthew Myers, Gilberto A Umana-Membreno, Tarun M Sanders, Umesh K Mishra, Brett D Nener, Murray V Baker, Giacinta Parish
We demonstrate highly selective and sensitive potentiometric ion sensors for calcium ion detection, operated without the use of a reference electrode. The sensors consist of AlGaN/GaN heterostructure-based transistor devices with chemical functionalisation of the gate area using poly (vinylchloride)-based (PVC) membranes having high selectivity towards calcium ions, Ca(2+). The sensors exhibited stable and rapid responses when introduced to various concentrations of Ca(2+). In both 0.01 M KCl and 0.01 M NaCl ionic strength buffer solutions, the sensors exhibited near Nernstian responses with detection limits of less than 10(-7) M, and a linear response range between 10(-7)-10(-2) M...
September 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915945/potentiometric-sensor-for-non-invasive-lactate-determination-in-human-sweat
#13
Massimo Onor, Stefano Gufoni, Tommaso Lomonaco, Silvia Ghimenti, Pietro Salvo, Fiodor Sorrentino, Emilia Bramanti
The present work describes a non invasive lactate sensing in sweat during workout. The sensing system is based on a non-equilibrium potentiometric measure performed using disposable, chemically modified, screen printed carbon electrodes (SPCEs) that can be wetted with sweat during the exercise. The potentiometric signal, which is proportional to lactate concentration in sweat, is produced by a redox reaction activated by UV radiation, as opposed to the enzymatic reaction employed in traditional, blood-based measuring devices...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28913978/a-temperature-sensor-implant-for-active-implantable-medical-devices-for-in-vivo-subacute-heating-tests-under-mri
#14
Berk Silemek, Volkan Acikel, Cagdas Oto, Akbar Alipour, Zaliha Gamze Aykut, Oktay Algin, Ergin Atalar
PURPOSE: To introduce a temperature sensor implant (TSI) that mimics an active implantable medical device (AIMD) for animal testing of MRI heating. Computer simulations and phantom experiments poorly represent potential temperature increases. Animal experiments could be a better model, but heating experiments conducted immediately after the surgery suffer from alterations of the thermoregulatory and tissue properties during acute testing conditions. Therefore, the aim of this study was to introduce a temperature sensor implant that mimics an AIMD and capable of measuring the electrode temperature after implantation of the device without any further intervention at any time after the surgery in an animal model...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28911670/voltammetric-sensor-for-tartrazine-determination-in-soft-drinks-using-poly-p-aminobenzenesulfonic-acid-zinc-oxide-nanoparticles-in-carbon-paste-electrode
#15
Ghasem Karim-Nezhad, Zeynab Khorablou, Maryam Zamani, Parisa Seyed Dorraji, Mahdieh Alamgholiloo
Zinc oxide nanoparticles (ZnO NPs) and p-aminobenzenesulfonic acid (p-ABSA) were used to fabricate a modified electrode, as a highly sensitive and selective voltammetric sensor, for the determination of tartrazine. A fast and easy method for the fabrication of poly p-ABSA (Pp-ABSA)/ZnO NPs-carbon paste electrode (Pp-ABSA/ZnO NPs-CPE) by cyclic voltammetry was used. By combining the benefits of Pp-ABSA, ZnO NPs, and CPE, the resulted modified electrode exhibited outstanding electrocatalytic activity in terms of tartrazine oxidation by giving much higher peak currents than those obtained for the unmodified CPE and also other constructed electrodes...
April 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28911630/nonenzymatic-glucose-sensor-based-on-disposable-pencil-graphite-electrode-modified-by-copper-nanoparticles
#16
Sima Pourbeyram, Khadijeh Mehdizadeh
A nonenzymatic glucose sensor based on a disposable pencil graphite electrode (PGE) modified by copper nanoparticles [Cu(NP)] was prepared for the first time. The prepared Cu(NP) exhibited an absorption peak centered at ∼562 nm using UV-visible spectrophotometry and an almost homogenous spherical shape by scanning electron microscopy. Cyclic voltammetry of Cu(NP)-PGE showed an adsorption controlled charge transfer process up to 90.0 mVs(-1). The sensor was applied for the determination of glucose using an amperometry technique with a detection limit of [0...
October 2016: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28902150/an-electrochemical-low-frequency-seismic-micro-sensor-based-on-mems-with-a-force-balanced-feedback-system
#17
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/28901351/all-solid-state-ion-selective-electrodes-with-redox-active-lithium-sodium-and-potassium-insertion-materials-as-the-inner-solid-contact-layer
#18
Shinichi Komaba, Tatsuya Akatsuka, Kohei Ohura, Chihiro Suzuki, Naoaki Yabuuchi, Shintaro Kanazawa, Kazuhiko Tsuchiya, Taku Hasegawa
All-solid-state ion-selective electrodes as potentiometric ion sensors for lithium, sodium, and potassium have been demonstrated by installing a composite layer containing a powder of alkali insertion materials, LixFePO4, Na0.33MnO2, and KxMnO2·nH2O, respectively, as an inner solid-contact layer between the electrode substrate and plasticized poly(vinyl chloride) (PVC)-based ion-sensitive membrane containing the corresponding ionophores for Li(+), Na(+), and K(+) ions. These double-layer ion-selective electrodes, consisting of the composite and PVC layers prepared by a simple drop cast method, exhibit a quick potential response (less than 5 s) to each alkali-metal ion with sufficient Nernstian slopes of calibration curves, ca...
September 13, 2017: Analyst
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/28898465/polar-electrode-bridged-electroluminescent-displays-2d-sensors-remotely-communicating-optically
#20
Xiuru Xu, Dan Hu, Lijia Yan, Shaoli Fang, Clifton Shen, Yueh-Lin Loo, Yuan Lin, Carter S Haines, Na Li, Anvar A Zakhidov, Hong Meng, Ray H Baughman, Wei Huang
A novel geometry for electroluminescent devices, which does not require transparent electrodes for electrical input, is demonstrated, theoretically analyzed, and experimentally characterized. Instead of emitting light through a conventional electrode, light emission occurs through a polar liquid or solid and input electrical electrodes are coplanar, rather than stacked in a sandwich configuration. This new device concept is scalable and easily deployed for a range of modular alternating-current-powered electroluminescent light sources and light-emitting sensing devices...
September 12, 2017: Advanced Materials
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