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https://www.readbyqxmd.com/read/29346076/ultrasensitive-electrochemical-immuno-sensing-platform-based-on-gold-nanoparticles-triggering-chlorpyrifos-detection-in-fruits-and-vegetables
#1
Anita Talan, Annu Mishra, Sergei A Eremin, Jagriti Narang, Ashok Kumar, Sonu Gandhi
Chlorpyrifos (chl) is an organophosphate pesticide extensively used in agriculture and highly toxic for human health. Fluorine doped tin-oxide (FTO) based electrochemical nanosensor was developed for chlorpyrifos detection with gold nanoparticles (AuNPs) and anti-chlorpyrifos antibodies (chl-Ab). AuNPs provides high electrical conductivity and specific resistivity, thus increases the sensitivity of immunoassay. High electrical conductivity of AuNPs reveals that it promotes the redox reaction for better cyclic voltammetry...
January 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29345430/wearable-wireless-tyrosinase-bandage-and-microneedle-sensors-toward-melanoma-screening
#2
Bianca Ciui, Aida Martin, Rupesh K Mishra, Barbara Brunetti, Tatsuo Nakagawa, Thomas J Dawkins, Mengjia Lyu, Cecilia Cristea, Robert Sandulescu, Joseph Wang
Wearable bendable bandage-based sensor and a minimally invasive microneedle biosensor are described toward rapid screening of skin melanoma. These wearable electrochemical sensors are capable of detecting the presence of the tyrosinase (TYR) enzyme cancer biomarker in the presence of its catechol substrate, immobilized on the transducer surface. In the presence of the surface TYR biomarker, the immobilized catechol is rapidly converted to benzoquinone that is detected amperometrically, with a current signal proportional to the TYR level...
January 18, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29342960/a-low-cost-inkjet-printed-aptamer-based-electrochemical-biosensor-for-the-selective-detection-of-lysozyme
#3
Niazul Islam Khan, Alec G Maddaus, Edward Song
Recently, inkjet-printing has gained increased popularity in applications such as flexible electronics and disposable sensors, as well as in wearable sensors because of its multifarious advantages. This work presents a novel, low-cost immobilization technique using inkjet-printing for the development of an aptamer-based biosensor for the detection of lysozyme, an important biomarker in various disease diagnosis. The strong affinity between the carbon nanotube (CNT) and the single-stranded DNA is exploited to immobilize the aptamers onto the working electrode by printing the ink containing the dispersion of CNT-aptamer complex...
January 15, 2018: Biosensors
https://www.readbyqxmd.com/read/29342953/review-of-recent-metamaterial-microfluidic-sensors
#4
REVIEW
Ahmed Salim, Sungjoon Lim
Metamaterial elements/arrays exhibit a sensitive response to fluids yet with a small footprint, therefore, they have been an attractive choice to realize various sensing devices when integrated with microfluidic technology. Micro-channels made from inexpensive biocompatible materials avoid any contamination from environment and require only microliter-nanoliter sample for sensing. Simple design, easy fabrication process, light weight prototype, and instant measurements are advantages as compared to conventional (optical, electrochemical and biological) sensing systems...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29341371/electrochemical-monitoring-of-aflatoxin-m1-in-milk-samples-using-silver-nanoparticles-dispersed-on-%C3%AE-cyclodextrin-gqds-nanocomposite
#5
Rana Shadjou, Mohammad Hasanzadeh, Mohammad Heidar-Poor, Nasrin Shadjou
Aflatoxins are potential food pollutants produced by fungi. One of important toxins is aflatoxin M1 (AFM1). A great deal of concern is associated with AFM1 toxicity. In the present study, an innovative electrochemical interface for quantitation of AFM1 based on ternary signal amplification strategy was fabricated. In this work, silver nanoparticles was electrodeposited onto green and biocompatible nanocomposite containing α-cyclodextrin as conductive matrix and graphene quantum dots as amplification element...
January 17, 2018: Journal of Molecular Recognition: JMR
https://www.readbyqxmd.com/read/29337577/preparation-of-nano-au-pt-alloy-microspheres-decorated-with-reduced-graphene-oxide-for-non-enzymatic-hydrogen-peroxide-sensing
#6
Zhixue Bai, Wenhao Dong, Yipeng Ren, Cong Zhang, Qiang Chen
The flourish of nanotechnology has brought new vitality to the research and development of electrochemical sensing materials. In this work, we successfully synthesized Nano Au & Pt alloy microspheres decorated with reduced graphene oxide (RGO/nAPAMSs) by a simple, facile and eco-friendly one-step reduction strategy for the fabrication of highly sensitive non-enzymatic H2O2 sensing interfaces. Energy-dispersive X-ray spectroscopy mapping (EDX mapping), energy-dispersive X-ray spectroscopy analyzer (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FT-IR) and X-ray diffraction spectrum (XRD) were employed to characterize RGO/nAPAMSs from a microscopic perspective...
January 16, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29335674/noble-metal-nanoparticles-in-biosensors-recent-studies-and-applications
#7
Hedieh Malekzad, Parham Sahandi Zangabad, Hamed Mirshekari, Mahdi Karimi, Michael R Hamblin
The aim of this review is to cover advances in noble metal nanoparticle (MNP)-based biosensors and to outline the principles and main functions of MNPs in different classes of biosensors according to the transduction methods employed. The important biorecognition elements are enzymes, antibodies, aptamers, DNA sequences, and whole cells. The main readouts are electrochemical (amperometric and voltametric), optical (surface plasmon resonance, colorimetric, chemiluminescence, photoelectrochemical, etc.) and piezoelectric...
June 27, 2017: Nanotechnology Reviews
https://www.readbyqxmd.com/read/29334458/direct-electrochemical-vibrio-dna-sensing-adopting-highly-stable-graphene-flavin-mononucleotide-aqueous-dispersion-modified-interface
#8
Tao Yang, Huaiyin Chen, Zhiwei Qiu, Renzhong Yu, Shizhong Luo, Weihua Li, Kui Jiao
A bio-functionalized graphene nanohybrid was prepared by simultaneously sonicating graphene and riboflavin 5'-monophosphate sodium salt (FMNS). FMNS, as a bio-dispersant, shows an efficient stabilization for obtaining highly dispersed graphene nanosheets in an aqueous solution. Due to the superior dispersion of graphene and the excellent electrochemical redox activity of FMNS, a direct electrochemical DNA sensor was fabricated adopting the inherent electrochemical redox activity of Gr-FMNS. The comparison between using traditional electrochemical indicator ([Fe(CN)6]3-/4-) and using the self-signal of Gr-FMNS was fully conducted to study the DNA sensing performance...
January 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29334198/enzyme-based-glucose-sensor-from-invasive-to-wearable-device
#9
REVIEW
Hyunjae Lee, Yongseok Joseph Hong, Seungmin Baik, Taeghwan Hyeon, Dae-Hyeong Kim
Blood glucose concentration is a key indicator of patients' health, particularly for symptoms associated with diabetes mellitus. Because of the large number of diabetic patients, many approaches for glucose measurement have been studied to enable continuous and accurate glucose level monitoring. Among them, electrochemical analysis is prominent because it is simple and quantitative. This technology has been incorporated into commercialized and research-level devices from simple test strips to wearable devices and implantable systems...
January 15, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29333655/preparation-of-high-percentage-1t-phase-transition-metal-dichalcogenide-nanodots-for-electrochemical-hydrogen-evolution
#10
Chaoliang Tan, Zhimin Luo, Apoorva Chaturvedi, Yongqing Cai, Yonghua Du, Yue Gong, Ying Huang, Zhuangchai Lai, Xiao Zhang, Lirong Zheng, Xiaoying Qi, Min Hao Goh, Jie Wang, Shikui Han, Xue-Jun Wu, Lin Gu, Christian Kloc, Hua Zhang
Nanostructured transition metal dichalcogenides (TMDs) are proven to be efficient and robust earth-abundant electrocatalysts to potentially replace precious platinum-based catalysts for the hydrogen evolution reaction (HER). However, the catalytic efficiency of reported TMD catalysts is still limited by their low-density active sites, low conductivity, and/or uncleaned surface. Herein, a general and facile method is reported for high-yield, large-scale production of water-dispersed, ultrasmall-sized, high-percentage 1T-phase, single-layer TMD nanodots with high-density active edge sites and clean surface, including MoS2 , WS2 , MoSe2 , Mo0...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29332791/highly-sensitive-and-reproducible-non-enzymatic-glucose-sensor-fabricated-by-drop-casting-novel-nanocomposite-with-3d-architecture-and-tailorable-properties-prepared-in-controllable-way
#11
Min Ma, Taotao Zhe, Yiyue Ma, Zonghan Wang, Qiang Chen, Jianlong Wang
Novel nanocomposite has tailorable properties and ordered 3D architecture similar to the structure of materials prepared by electrodeposition which is convenient and efficient but the reproducibility is limited because of the uncontrollable preparation process, was scientifically synthetized in controllable way and used for non-enzymatic glucose sensor for the first time. Flower-like α-Ni(OH)2 with high specific surface areas and good anion transport ability benefited from its distinctive stacking faults and turbostratic disorder structure was synthesized through facile one-step hydrothermal method...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331776/low-cost-screen-printed-electrodes-based-on-electrochemically-reduced-graphene-oxide-carbon-black-nanocomposites-for-dopamine-epinephrine-and-paracetamol-detection
#12
G Ibáñez-Redín, D Wilson, D Gonçalves, O N Oliveira
A green approach for the preparation of carbon black (CB) and electrochemically reduced graphene oxide composite (ERGO) is described based on screen printed carbon electrodes (SPCEs) fabricated on poly(ethylene terephthalate) (PET) as electrochemical sensors. This approach leads to a heterogeneous hydrophilic surface with high concentration of defect sites according to scanning electron microscopy, contact angle and Raman spectroscopy measurements. The SPCE/CB-ERGO sensor was tested with dopamine (DA), epinephrine (EP) and paracetamol (PCM), exhibiting an enhanced electrocatalytic performance compared to the bare SPCE...
December 30, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29331430/disposable-inkjet-printed-electrochemical-platform-for-detection-of-clinically-relevant-her-2-breast-cancer-biomarker
#13
Susanita Carvajal, Samantha N Fera, Abby L Jones, Thaisa A Baldo, Islam M Mosa, James F Rusling, Colleen E Krause
Rapidly fabricated, disposable sensor platforms hold tremendous promise for point-of-care detection. Here, we present an inexpensive (< $0.25) fully inkjet printed electrochemical sensor with integrated counter, reference, and working electrodes that is easily scalable for commercial fabrication. The electrochemical sensor platform featured an inkjet printed gold working 8-electrode array (WEA) and counter electrode (CE), along with an inkjet -printed silver electrode that was chlorinated with bleach to produce a Ag/AgCl quasi-reference electrode (RE)...
January 4, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29331428/heating-enhanced-sensitive-and-selective-electrochemical-detection-of-hg2-based-on-t-hg2-t-structure-and-exonuclease-iii-assisted-target-recycling-amplification-strategy-at-heated-gold-disk-electrode
#14
Shao-Hua Wu, Biao Zhang, Fang-Fang Wang, Zhen-Zhen Mi, Jian-Jun Sun
A sensitive and selective electrochemical Hg2+ sensor was developed based on T-Hg2+-T structure and exonuclease (Exo) III -assisted target recycling amplification at heated gold disk electrode (HAuDE). First, a DNA signal probe P1 was for the first time designed and labeled with ferrocene (Fc) near the attached SH-5'-end, so as to shorten the distance between Fc and the electrode and enhance the initial current of Fc compared with that labeled at the 3'-end far from the electrode. Then the signal amplification was achieved by Exo III-assisted Hg2+ recycling...
January 5, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29329705/low-cost-and-disposable-sensors-for-the-simultaneous-determination-of-coenzyme-q10-and-%C3%AE-lipoic-acid-using-manganese-iv-oxide-modified-screen-printed-graphene-electrodes
#15
Kanokwan Charoenkitamorn, Sudkate Chaiyo, Orawon Chailapakul, Weena Siangproh
In this work, for the first time, manganese (IV) oxide-modified screen-printed graphene electrodes (MnO2/SPGEs) were developed for the simultaneous electrochemical detection of coenzyme Q10 (CoQ10) and α-lipoic acid (ALA). This sensor exhibits attractive benefits such as simplicity, low production costs, and disposability. Cyclic voltammetry (CV) was used to characterize the electrochemical behavior of the analyte and investigate the capacitance and electroactive surface area of the unmodified and modified electrode surfaces...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329704/a-detailed-electrochemical-impedance-spectroscopy-study-of-a-bismuth-film-glassy-carbon-electrode-for-trace-metal-analysis
#16
Barbara Petovar, Klodian Xhanari, Matjaž Finšgar
A systematic electrochemical impedance spectroscopy (EIS) analysis at different potentials of an in situ-prepared bismuth-film glassy carbon electrode (BiFE) in 0.1 M acetate buffer solution is reported. This electrode is employed in the square-wave anodic stripping voltammetry (SWASV) technique for the determination of trace amounts of the heavy metals Zn, Cd, and Pb. The method was first validated for detection limit, linear range, sensitivity, precision and accuracy to clearly prove the superior action of BiFE compared with the bare glassy carbon electrode (GCE)...
April 3, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29329274/current-technologies-of-electrochemical-immunosensors-perspective-on-signal-amplification
#17
REVIEW
Il-Hoon Cho, Jongsung Lee, Jiyeon Kim, Min-Soo Kang, Jean Kyung Paik, Seockmo Ku, Hyun-Mo Cho, Joseph Irudayaraj, Dong-Hyung Kim
An electrochemical immunosensor employs antibodies as capture and detection means to produce electrical charges for the quantitative analysis of target molecules. This sensor type can be utilized as a miniaturized device for the detection of point-of-care testing (POCT). Achieving high-performance analysis regarding sensitivity has been one of the key issues with developing this type of biosensor system. Many modern nanotechnology efforts allowed for the development of innovative electrochemical biosensors with high sensitivity by employing various nanomaterials that facilitate the electron transfer and carrying capacity of signal tracers in combination with surface modification and bioconjugation techniques...
January 12, 2018: Sensors
https://www.readbyqxmd.com/read/29328971/ultrasensitive-electrochemical-sensing-of-hg2-based-on-thymine-hg2-thymine-interaction-and-signal-amplification-of-alkaline-phosphatase-catalyzed-silver-deposition
#18
Aigui Xu, Long Chao, Hongbo Xiao, Yuyun Sui, Jia Liu, Qingji Xie, Shouzhuo Yao
We report an ultrasensitive electrochemical sensor for Hg2+ detection, on the basis of two Hg2+-specific oligonucleotide probes (a thiolated capture probe and a biotinated signal probe), "terminal" signal amplification of alkaline phosphatase catalyzed deposition of silver and in situ microliter-droplet anodic stripping voltammetry (ASV). The thiolated capture probe is immobilized on an Au-plated glassy carbon electrode, and the biotinated signal probe is then attached to the electrode surface through the thymine-Hg2+-thymine interaction in the presence of Hg2+...
January 5, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29328969/poly-3-6-diamino-9-ethylcarbazole-based-molecularly-imprinted-polymer-sensor-for-ultra-sensitive-and-selective-detection-of-17-%C3%AE-estradiol-in-biological-fluids
#19
Weilu Liu, Haifeng Li, Shangmin Yu, Jiaxing Zhang, Weihua Zheng, Liting Niu, Gengen Li
In this work, we reported the synthesis of 3, 6-diamino-9-ethylcarbazole and its application as a new monomer for preparation of molecularly imprinted polymer (MIP) electrochemical sensor. The as prepared MIP sensor exhibited ultrahigh sensitivity and selectivity for the detection of 17-β-estradiol in attomolar levels (1 × 10-18molL-1). The sensor works by detecting the change of the interfacial impedance that is derived from recognition of 17-β-estradiol on the MIP layer. The MIP sensor based on 3, 6-diamino-9-ethylcarbazole monomer revealed better performance than that of unmodified carbazole monomer...
January 4, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29324685/novel-spectroscopic-and-electrochemical-sensors-and-nanoprobes-for-the-characterization-of-food-and-biological-antioxidants
#20
REVIEW
Reşat Apak, Sema Demirci Çekiç, Ayşem Üzer, Saliha Esin Çelik, Mustafa Bener, Burcu Bekdeşer, Ziya Can, Şener Sağlam, Ayşe Nur Önem, Erol Erçağ
Since an unbalanced excess of reactive oxygen/nitrogen species (ROS/RNS) causes various diseases, determination of antioxidants that can counter oxidative stress is important in food and biological analyses. Optical/electrochemical nanosensors have attracted attention in antioxidant activity (AOA) assessment because of their increased sensitivity and selectivity. Optical sensors offer advantages such as low cost, flexibility, remote control, speed, miniaturization and on-site/in situ analysis. Electrochemical sensors using noble metal nanoparticles on modified electrodes better catalyze bioelectrochemical reactions...
January 11, 2018: Sensors
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