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https://www.readbyqxmd.com/read/28635631/ag-nanoparticles-drop-casting-modification-of-screen-printed-electrodes-for-the-simultaneous-voltammetric-determination-of-cu-ii-and-pb-ii
#1
Clara Pérez-Ràfols, Julio Bastos-Arrieta, Núria Serrano, José Manuel Díaz-Cruz, Cristina Ariño, Joan de Pablo, Miquel Esteban
A new silver nanoparticle modified screen-printed electrode was developed and applied to the simultaneous determination of Pb(II) and Cu(II). Two different types of silver nanoparticles with different shapes and sizes, Ag nanoseeds and Ag nanoprisms, were microscopically characterized and three different carbon substrates, graphite, graphene and carbon nanofibers, were tested. The best analytical performance was achieved for the combination of Ag nanoseeds with a carbon nanofiber modified screen-printed electrode...
June 21, 2017: Sensors
https://www.readbyqxmd.com/read/28627551/gold-loaded-nanoporous-iron-oxide-nanocubes-a-novel-dispersible-capture-agent-for-tumor-associated-autoantibody-analysis-in-serum
#2
Sharda Yadav, Mostafa Kamal Masud, Md Nazmul Islam, Vinod Gopalan, Alfred King-Yin Lam, Shunsuke Tanaka, Nam-Trung Nguyen, Md Shahriar Al Hossain, Cuiling Li, Md Yusuke Yamauchi, Muhammad J A Shiddiky
Autoantibodies are produced against tumor associated antigens (TAAs) long before the appearance of any symptoms and thus can serve as promising, non-invasive biomarkers for early diagnosis of cancer. Current conventional methods for autoantibody detection are highly invasive and mostly provide diagnosis in the later stages of cancer. Herein we report a new electrochemical method for early detection of p53 autoantibodies against colon cancer using a strategy that combines the strength of gold-loaded nanoporous iron oxide nanocube (Au@NPFe2O3NC)-based capture and purification while incorporating the inherent simplicity, inexpensive, and portable nature of the electrochemical and naked-eye colorimetric readouts...
June 19, 2017: Nanoscale
https://www.readbyqxmd.com/read/28627257/toward-the-development-of-a-glucose-dehydrogenase-based-saliva-glucose-sensor-without-the-need-for-sample-preparation
#3
Chi Lin, Breanna Pratt, Mackenzie Honikel, Alaina Jenish, Bhavna Ramesh, Amnah Alkhan, Jeffrey T La Belle
BACKGROUND: Strict glycemic control is known to be a vital key in the management of diabetes mellitus (DM). However, traditional methods face limitations in their efficacy due to the pain and invasiveness of needle pricking which often discourages DM patients from performing the required number of tests per day. Saliva glucose (SG) sensing has long been considered a noninvasive alternative to blood glucose monitoring for diabetes management, however the sample preparation and sensor detection limit have been deemed as challenges to overcome...
June 1, 2017: Journal of Diabetes Science and Technology
https://www.readbyqxmd.com/read/28609740/enhanced-photovoltaic-performance-of-dye-sensitized-solar-cells-based-on-nickel-oxide-supported-on-nitrogen-doped-graphene-nanocomposite-as-a-photoanode
#4
Palraj Ranganathan, Ragu Sasikumar, Shen-Ming Chen, Syang-Peng Rwei, Pedaballi Sireesha
We applied the nitrogen-doped graphene@nickel oxide (NGE/NiO) nanocomposite doped TiO2 as a photo-anode for dye-sensitized solar cells (DSSCs) on fluorine-doped tin oxide (FTO) substrates by screen printing method. Power conversion efficiency (PCE) of 9.75% was achieved for this DSSCs device, which is greater than that of DSSCs devices using GO/TiO2, and NiO/TiO2 based photo-anodes (PCE=8.55, and 9.11%). Also, the fill factor (FF) of the DSSCs devices using the NGE/NiO/TiO2 nanocomposite photo-anode was better than that of other photo-anodes...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28599178/study-of-small-cell-lung-cancer-cell-based-sensor-and-its-applications-in-chemotherapy-effects-rapid-evaluation-for-anticancer-drugs
#5
Hui Guohua, Lu Hongyang, Jiang Zhiming, Zhu Danhua, Wan Haifang
Small cell lung cancer (SCLC) is a smoking-related cancer disease. Despite improvement in clinical survival, SCLC outcome remains extremely poor. Cisplatin (DDP) is the first-line chemotherapy drug for SCLC, but the choice of second-line chemotherapy drugs is not clear. In this paper, a SCLC cell-based sensor was proposed, and its applications in chemotherapy effects rapid evaluation for anticancer drugs were investigated. SCLC cell lines lung adenocarcinoma cell (LTEP-P) and DDP-resistant lung adenocarcinoma cell (LTEP-P/DDP-1...
May 31, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28576321/quantification-of-gene-specific-dna-methylation-in-oesophageal-cancer-via-electrochemistry
#6
Md Hakimul Haque, Vinod Gopalan, Md Nazmul Islam, Mostafa Kamal Masud, Ripon Bhattacharjee, Md Shahriar Al Hossain, Nam-Trung Nguyen, Alfred K Lam, Muhammad J A Shiddiky
Development of simple and inexpensive method for the analysis of gene-specific DNA methylation is important for the diagnosis and prognosis of patients with cancer. Herein, we report a relatively simple and inexpensive electrochemical method for the sensitive and selective detection of gene-specific DNA methylation in oesophageal cancer. The underlying principle of the method relies on the affinity interaction between DNA bases and unmodified gold electrode. Since the affinity trend of DNA bases towards the gold surface follows as adenine (A) > cytosine (C) > guanine (G)> thymine (T), a relatively larger amount of bisulfite-treated adenine-enriched unmethylated DNA adsorbs on the screen-printed gold electrodes (SPE-Au) in comparison to the guanine-enriched methylated sample...
July 11, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28574350/characterization-of-kerfless-linear-arrays-based-on-pzt-thick-film
#7
Tomasz Zawada, Louise Bierregaard, Erling Ringgaard, Ruichao Xu, Michele Guizzetti, Franck Levassort, Dominique Certon
Multi-element transducers enabling novel cost-effective fabrication of imaging arrays for medical applications have been presented earlier. Due to the favorable low lateral coupling of the screen-printed PZT, the elements can be defined by the top electrode pattern only, leading to a kerfless design with low cross-talk between the elements. The thick-film based linear arrays have proved to be compatible with a commercial ultrasonic scanner and to support linear array beamforming as well as phased array beamforming...
May 26, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28573849/mass-producible-2d-mos2-impregnated-screen-printed-electrodes-which-demonstrate-efficient-electrocatalysis-towards-the-oxygen-reduction-reaction
#8
Samuel James Rowley-Neale, Graham C Smith, Craig E Banks
2D-MoS2 screen-printed electrodes (2D-MoS2-SPEs) have been designed, fabricated and evaluated towards the electrochemical oxygen reduction reaction (ORR) within acidic aqueous media. A screen-printable ink has been developed which allows for the tailoring of the 2D-MoS2 content/mass used in the fabrication of the 2D-MoS2-SPEs, which critically affects the observed ORR performance. In comparison to graphite screen-printed electrodes (G-SPEs) the 2D-MoS2-SPEs are shown to exhibit an electrocatalytic behaviour towards the ORR which is found, critically, to be reliant upon the percentage mass incorporation of 2D-MoS2 in the 2D-MoS2-SPEs; a greater percentage mass of 2D-MoS2 incorporated into the 2D-MoS2-SPEs results in a significantly less electronegative ORR onset potential and a greater signal output (current density)...
June 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28551153/sequential-injection-system-with-amperometric-immunosensor-for-sensitive-determination-of-human-immunoglobulin-g
#9
Chidkamon Thunkhamrak, Preeyaporn Reanpang, Kontad Ounnunkad, Jaroon Jakmunee
Sequential injection (SI) system incorporated with amperometric immunosensor was developed for sensitive determination of human immunoglobulin G (HIgG). A cost effective label-free immunosensor was fabricated by immobilizing anti-HIgG on a graphene oxide (GO) modified screen-printed carbon electrode (SPCE). The developed electrode was characterized by cyclic voltammetry(CV), scanning electron microscope(SEM), and energy dispersive spectroscopy(EDS) which confirmed the selective immunointeraction of HIgG to the anti-HIgG on the electrode, thus reduced the amperometric current of [Fe(CN)6](3-/4-) redox probe...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28534297/single-frequency-impedance-analysis-on-reduced-graphene-oxide-screen-printed-electrode-for-biomolecular-detection
#10
Rajesh, Shobhita Singal, Ravinder K Kotnala
A biofunctionalized reduced graphene oxide (rGO)-modified screen-printed carbon electrode (SPCE) was constructed as an immunosensor for C-reactive protein (CRP) detection, a biomarker released in early stage acute myocardial infarction. A different approach of single frequency analysis (SFA) study was utilized for the biomolecular sensing, by monitoring the response in phase angle changes obtained at an optimized frequency resulting from antigen-antibody interactions. A set of measurements were carried out to optimize a frequency where a maximum change in phase angle was observed, and in this case, we found it at around 10 Hz...
May 22, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28531970/ultrasensitive-cholesterol-biosensor-based-on-enzymatic-silver-deposition-on-gold-nanoparticles-modified-screen-printed-carbon-electrode
#11
Yong Huang, Lijie Cui, Yewei Xue, Songbai Zhang, Nixuan Zhu, Jintao Liang, Guiyin Li
Cholesterol is one of the essential structural constituents of cell membranes. Determination of cholesterol is of great importance in clinical analysis because the level of cholesterol in serum is an indicator in the diagnosis and prevention of heart diseases. In this work, a simple and ultrasensitive cholesterol biosensor based on enzymatic silver deposition was designed by immobilizing cholesterol oxidase (CHOD) and cholesterol esterase (CHER) onto the surface of gold nanoparticles (Au NPs) modified screen-printed carbon electrode (SPE)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531136/a-stretchable-electromagnetic-absorber-fabricated-using-screen-printing-technology
#12
Heijun Jeong, Sungjoon Lim
A stretchable electromagnetic absorber fabricated using screen printing technology is proposed in this paper. We used a polydimethylsiloxane (PDMS) substrate to fabricate the stretchable absorber since PDMS exhibits good dielectric properties, flexibility, and restoring capabilities. DuPont PE872 (DuPont, Wilmington, CT, USA), a stretchable silver conductive ink, was used for the screen printing technique. The reflection coefficient of the absorber was measured using a vector network analyzer and a waveguide...
May 21, 2017: Sensors
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
#13
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/28521528/prevention-and-control-of-emergent-infectious-disease-with-high-specific-antigen-sensor
#14
Hongzhe Zhang, Shanshan Zhang, Nan Liu
This study aims to evaluate the application of a new type of high specificity antigen sensor in detecting the viruses in sudden infectious diseases. Influenza A (H1N1) virus immunosensor was used for the respective determination of the six kinds of antigens of H1N1, H3N2 viral protein, HA protein of H7N9, influenza B virus, adenovirus, and EV71 virus of same dilution degree on the Screen Printed Carbon Electrode (SPCE), so as to test the specificity of the detection method. In addition, various batches of chick embryo allantoic saliva dilution simulation samples were also detected on their recovery (accuracy), repeatability (precision), and stability...
May 18, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28516982/colorimetric-and-electrochemical-quantification-of-global-dna-methylation-using-a-methyl-cytosine-specific-antibody
#15
Md Hakimul Haque, Ripon Bhattacharjee, Md Nazmul Islam, Vinod Gopalan, Nam-Trung Nguyen, Alfred K Lam, Muhammad J A Shiddiky
We report a simple colorimetric (naked-eye) and electrochemical method for the rapid, sensitive and specific quantification of global methylation levels using only 25 ng of input DNA. Our approach utilises a three-step strategy; (i) initial adsorption of the extracted, purified and denatured bisulfite-treated DNA on a screen-printed gold electrode (SPE-Au), (ii) immuno-recognition of methylated DNA using a horseradish peroxidase (HRP)-conjugated methylcytosine (HRP-5mC) antibody and (iii) subsequent colorimetric detection by the enzymatic oxidation of 3,3',5,5'-tetramethylbenzidin (TMB)/H2O2 which generated a blue-coloured product in the presence of methylated DNA and HRP-5mC immunocomplex...
May 18, 2017: Analyst
https://www.readbyqxmd.com/read/28513083/screen-printed-ambulatory-electrode-set-enables-accurate-diagnostics-of-sleep-bruxism
#16
Tomi Miettinen, Katja Myllymaa, Anu Muraja-Murro, Susanna Westeren-Punnonen, Taina Hukkanen, Juha Töyräs, Reijo Lappalainen, Esa Mervaala, Kirsi Sipilä, Sami Myllymaa
Currently, definite diagnosis of sleep bruxism requires polysomnography. However, it is restrictedly available, and too cumbersome and expensive for the purpose. The aim of this study was to introduce an ambulatory electrode set and evaluate its feasibility for more cost-effective diagnostics of sleep bruxism. Six self-assessed bruxers (one male, five females; aged 21-58 years) and six healthy controls (four males, two females, aged 21-25 years) underwent a standard polysomnographic study and a concurrent study with the ambulatory electrode set...
May 17, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28509848/biosensor-based-on-tyrosinase-immobilized-on-graphene-decorated-gold-nanoparticle-chitosan-for-phenolic-detection-in-aqueous
#17
Fuzi Mohamed Fartas, Jaafar Abdullah, Nor Azah Yusof, Yusran Sulaiman, Mohd Izham Saiman
In this research work, electrochemical biosensor was fabricated based on immobilization of tyrosinase onto graphene-decorated gold nanoparticle/chitosan (Gr-Au-Chit/Tyr) nanocomposite-modified screen-printed carbon electrode (SPCE) for the detection of phenolic compounds. The nanocomposite film was constructed via solution casting method. The electrocatalytic activity of the proposed biosensor for phenol detection was studied using differential pulse voltammetry (DPV) and cyclic voltammetry (CV). Experimental parameters such as pH buffer, enzyme concentration, ratio of Gr-Au-Chit, accumulation time and potential were optimized...
May 16, 2017: Sensors
https://www.readbyqxmd.com/read/28501177/determination-of-stability-characteristics-for-electrochemical-biosensors-via-thermally-accelerated-ageing
#18
Peter Panjan, Vesa Virtanen, Adama Marie Sesay
Biosensors are devices that are prone to ageing; this phenomenon can be characterized as a decrease in signal over time. Biosensor stability is of a crucial importance for commercial success and as biosensors are presently being applied to an increasing and variety of applications. Stability characteristics related to shelf life, reusability and/or continuous use stability are often poorly investigated or unreported in literature, yet are important factors. Instability or ageing can be accelerated at an elevated temperature; Arrhenius (exponential) and linear models were investigated in order to propose a novel method for rapid ageing characteristics determination...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28501144/sequential-injection-differential-pulse-voltammetric-method-based-on-screen-printed-carbon-electrode-modified-with-carbon-nanotube-nafion-for-sensitive-determination-of-paraquat
#19
Prakit Chuntib, Suwaphid Themsirimongkon, Surin Saipanya, Jaroon Jakmunee
The screen-printed carbon electrode (SPCE) modified with various nanoparticles has been studied for using as a working electrode in voltammetric technique. The electrochemical behavior of paraquat on different electrodes was studied by cyclic voltammetry (CV), and then differential pulse voltammetry (DPV) has been employed for trace analysis of paraquat based on redox reaction which the peak current was directly proportional to the concentration of paraquat in the solution. The SPCE modified with carbon nanotube dispersed in Nafion and ethanol (SPCE-CNT/Nafion) gave the best result...
August 1, 2017: Talanta
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
#20
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
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