Novel Pt nanowires modified screen-printed gold electrode by electrodeposited method

Zhao, Hongli; Chang-xiang, Zhou; Teng, Yuanjie; Chen, Chen; Lan, Minbo

doi:10.1016/j.apsusc.2010.11.151

Cited by 6 publications

(4 citation statements)

References 38 publications

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“…They could keep activity of enzyme due to the desirable microenvironment, and enhance the direct electron transfer between the enzyme's active sites and the electrode. Up to now, many inorganic nanomaterials, such as gold nanoparticles and nanoclusters [2][3][4], CNTs [5,6], nanocrystalline diamond [7], calcium carbonate nanoparticles [8], Pt nanowires [9] and Ag nanoparticles [10], have been used as signal transducers and platforms for the enzyme immobilization in biosensors. In biosensors based on CNTs, the CNTs play multiple roles: (1) a substrate to immobilize enzyme, (2) electrocatalytic oxidation or reduction of H 2 O 2 at the CNT surface to reduce overvoltage and avoid interference from other co-existing electroactive species, and (3) an enhanced signal because of its fast electron transfer and large working surface area [11].…”

Section: Introductionmentioning

confidence: 99%

A novel l-lactate sensor based on enzyme electrode modified with ZnO nanoparticles and multiwall carbon nanotubes

Wang

et al. 2011

Journal of Electroanalytical Chemistry

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Section: Introductionmentioning

confidence: 99%

A novel l-lactate sensor based on enzyme electrode modified with ZnO nanoparticles and multiwall carbon nanotubes

Wang

et al. 2011

Journal of Electroanalytical Chemistry

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“…The portability of the electrochemical instruments typically used also makes these systems ideal for point of care (POC) analysis [24][25][26][27]. The working electrode can be modified with various materials and recognition elements such as noble metal nanoparticles (i.e., Cu, Ni, Au, Pt, Ag) [28][29][30][31][32][33][34][35][36][37], nanotubes (CNT) [38][39][40][41][42][43][44], nanofibers (CNF) [43,[45][46][47][48][49], graphene [50], graphene oxide (GO) [51-54], reduced graphene oxide (rGO) [55-58], quantum dots (QDs) [59-64], magnetic beads (MB) [65-68], enzymes (AChE, ALP, GOD, HRP, FDH, OPH, Tyr) [69][70][71][72][73][74][75][76][77][78][79][80], antibodies [81][82][83][84][85][86][87], aptamers…”

Section: Introductionmentioning

confidence: 99%

Electrochemical (Bio)Sensors for Pesticides Detection Using Screen-Printed Electrodes

2020

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Pesticides are among the most important contaminants in food, leading to important global health problems. While conventional techniques such as high-performance liquid chromatography (HPLC) and mass spectrometry (MS) have traditionally been utilized for the detection of such food contaminants, they are relatively expensive, time-consuming and labor intensive, limiting their use for point-of-care (POC) applications. Electrochemical (bio)sensors are emerging devices meeting such expectations, since they represent reliable, simple, cheap, portable, selective and easy to use analytical tools that can be used outside the laboratories by non-specialized personnel. Screen-printed electrodes (SPEs) stand out from the variety of transducers used in electrochemical (bio)sensing because of their small size, high integration, low cost and ability to measure in few microliters of sample. In this context, in this review article, we summarize and discuss about the use of SPEs as analytical tools in the development of (bio)sensors for pesticides of interest for food control. Finally, aspects related to the analytical performance of the developed (bio)sensors together with prospects for future improvements are discussed.

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“…These are small devices that contain an electrochemical cell made by a reference electrode, a working electrode and a counter electrode. The SPCEs have an easily modifiable carbon working electrode in which metallic nanoparticles such as Ni [7,26], Cu [27][28][29], Pt [30,31], Au [32][33][34], bi-metallic nanoparticles [35][36][37][38],…”

Section: Introductionmentioning

confidence: 99%

“…Immunosensor validation: comparison with HPLC-MS/MSOur immunosensor was validated by comparison with HPCL-MS/MS, the reference method used in official laboratories for IMD analysis. The study consisted in the analysis with both methods of a tap water sample doped with an unknown amount of IMD, and the further comparison of the methods by the student's t test, according to the following equation:= ̅ − ̅ √ × +where X ̅ A and X ̅ B are the average of the IMD concentration estimated by the electrochemical immunosensor (675 pmol L -1 ) and the HPLC-MS/MS method (701 pmol L -1 ), N A and N B are the number of replicates (10 for both methods) and S c is the joint standard deviation, calculated as follows:(35) and S B(30) are the individual standard deviation of each method.…”

mentioning

confidence: 99%

Direct competitive immunosensor for Imidacloprid pesticide detection on gold nanoparticle-modified electrodes

Pérez-Fernández

Mercader

Abad‐Fuentes

et al. 2020

Talanta

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A direct competitive immunosensor for the electrochemical determination of Imidacloprid (IMD) pesticide on gold nanoparticle-modified screen-printed carbon electrodes (AuNP-SPCE) is here reported for the first time. Self-obtained specific monoclonal antibodies are immobilized on the AuNP-SPCE taking advantage of the AuNPs biofunctionalization abilities. In our biosensor design, free IMD in the sample competes with IMD conjugated with horseradish peroxidase (IMD-HRP) for the recognition by the antibodies. After that, 3,3′,5,5′-Tetramethylbenzidine (TMB) is enzymatically oxidized by HRP, followed by the oxidized TMB reduction back at the surface of the SPCE. This process gives an associated catalytic current (analytical signal) that is inversely proportional to the IMD amount. The main parameters affecting the analytical signal have been optimized, reaching a good precision (repeatability with a RSD of 6%), accuracy (relative error of 6%), stability (up to one month), selectivity and an excellent limit of detection (LOD of 22 pmol L -1 ), below the maximum levels allowed by the legislation, with a wide response range (50 -10000 pmol L -1 ). The detection through antibodies also allows to have an excellent selectivity against other pesticides potentially present in real samples. Low matrix effects were found when analysisng IMD in tap water and watermelon samples. The electrochemical immunosensor was also validated with HPLC-MS/MS, the reference method used in official laboratories for IMD analysis, through statistical tests. Our findings make the electrochemical immunosensor as an outstanding method for the rapid and sensitive determination of IMD at the point-of-use.

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Novel Pt nanowires modified screen-printed gold electrode by electrodeposited method

Cited by 6 publications

References 38 publications

A novel l-lactate sensor based on enzyme electrode modified with ZnO nanoparticles and multiwall carbon nanotubes

A novel l-lactate sensor based on enzyme electrode modified with ZnO nanoparticles and multiwall carbon nanotubes

Electrochemical (Bio)Sensors for Pesticides Detection Using Screen-Printed Electrodes

Direct competitive immunosensor for Imidacloprid pesticide detection on gold nanoparticle-modified electrodes

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