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Voltammetry

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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/29345262/copper-i-complexes-with-phosphine-derived-from-sparfloxacin-part-iii-multifaceted-cell-death-and-preliminary-study-of-liposomal-formulation-of-selected-copper-i-complexes
#2
A Kyzioł, A Cierniak, J Gubernator, A Markowski, M Jeżowska-Bojczuk, U K Komarnicka
The cytotoxic effect of iodide or thiocyanate copper(i) complexes (1-PSf, 2-PSf, 3-PSf, 4-PSf) with phosphine derived from sparfloxacin (HSf) and 2,9-dimethyl-1,10-phenanthroline (dmp) or 2,2'-biquinoline (bq) as diimine auxiliary ligands was proved in vitro on somatic (MRC-5) and neoplastic (MCF7) human cell lines. Differences in mode of action were investigated in-depth for the selected dmp and bq complexes (1-PSf, 3-PSf, respectively) by elucidation of the following: (i) the efficiency to produce reactive oxygen species (ROS) in biological systems (cyclic voltammetry); (ii) their impact on mitochondrial membrane potential; (iii) potency for the activation of caspases 3 and 9; (iv) influence on the degree of DNA degradation (comet assay)...
January 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29342881/development-of-self-assembled-nanoribbon-bound-peptide-polyaniline-composite-scaffolds-and-their-interactions-with-neural-cortical-cells
#3
Andrew M Smith, Harrison T Pajovich, Ipsita A Banerjee
Degenerative neurological disorders and traumatic brain injuries cause significant damage to quality of life and often impact survival. As a result, novel treatments are necessary that can allow for the regeneration of neural tissue. In this work, a new biomimetic scaffold was designed with potential for applications in neural tissue regeneration. To develop the scaffold, we first prepared a new bolaamphiphile that was capable of undergoing self-assembly into nanoribbons at pH 7. Those nanoribbons were then utilized as templates for conjugation with specific proteins known to play a critical role in neural tissue growth...
January 13, 2018: Bioengineering
https://www.readbyqxmd.com/read/29342848/a-voltammetric-electronic-tongue-for-the-resolution-of-ternary-nitrophenol-mixtures
#4
Andreu González-Calabuig, Xavier Cetó, Manel Del Valle
This work reports the applicability of a voltammetric sensor array able to quantify the content of 2,4-dinitrophenol, 4-nitrophenol, and picric acid in artificial samples using the electronic tongue (ET) principles. The ET is based on cyclic voltammetry signals, obtained from an array of metal disk electrodes and a graphite epoxy composite electrode, compressed using discrete wavelet transform with chemometric tools such as artificial neural networks (ANNs). ANNs were employed to build the quantitative prediction model...
January 13, 2018: Sensors
https://www.readbyqxmd.com/read/29342351/organic-mixed-valence-compounds-derived-from-cyclic-alkyl-amino-carbenes
#5
Max M Hansmann, Mohand Melaimi, Guy Bertrand
Readily available room temperature stable organic mixed valence compounds are prepared by one-electron reduction of cyclic bis(iminium) salts [derived from cyclic (alkyl)(amino)carbenes] bridged by various spacers. These compounds show characteristic intervalence charge transfer (IV-CT) bands in the near-infrared (NIR). Cyclic voltammetry, EPR, IR, UV-VIS and X-ray studies, as well as DFT calculations, show that depending on the nature of the spacer, these mixed valence compounds range from class III to borderline class I/II...
January 17, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29340393/ferrocenyl-sulfonium-ionic-liquids-synthesis-characterization-and-electrochemistry
#6
Alexander Venker, Tobias Vollgraff, Jörg Sundermeyer
New ferrocenylsulfonium cation based ionic liquids were prepared by direct alkylation of the corresponding ferrocenyl-based thioethers with N-alkylbis(trifluoromethanesulfonyl)imides (R'TFSI). This convenient direct access to organometallic sulfonium bis(trifluoromethanesulfonyl)imide (TFSI) salts without the need for ion exchange was chosen in order to obtain highly pure and reversibly redox active room temperature ILs in many cases. In other cases the anion cation interaction in the solid state was studied by XRD analyses...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29339058/carboxylic-group-riched-graphene-oxide-based-disposable-electrochemical-immunosensor-for-cancer-biomarker-detection
#7
Sajid Rauf, Geetesh K Mishra, Jahanzaib Azhar, Rupesh K Mishra, K Yugender Goud, Muhammad Azhar Hayat Nawaz, Jean Louis Marty, Akhtar Hayat
In this work, we have developed for the first time a carboxylic group riched graphene oxide based disposable electrochemical immunosensor for cancer biomarker detection using methylene blue (MB). The developed immunosensor is highly sensitive for detection of biomarker Mucin1 (MUC1) in human serum samples. Development of this disposable electrochemical immunosensor was premeditated by applying specific monoclonal antibodies against MUC1. In this method, we explored highly conductive surface of carboxylic group (-COOH-) rich graphene oxide (GO) on screen-printed carbon electrodes (SPCE)...
January 12, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29338195/mesoporous-silica-thin-films-for-improved-electrochemical-detection-of-paraquat
#8
Tauqir Nasir, Gregoire Herzog, Marc Hebrant, Christelle Despas, Liang Liu, Alain Walcarius
An electrochemical method was developed for rapid and sensitive detection of the herbicide paraquat in aqueous samples using mesoporous silica thin film modified glassy carbon electrodes (GCE). Vertically-aligned mesoporous silica thin films were deposited onto GCE by electrochemically assisted self-assembly (EASA). Cyclic voltammetry revealed effective response to the cationic analyte (while rejecting anions) thanks to the charge selectivity exhibited by the negatively-charged mesoporous channels. Square wave voltametry (SWV) was then used to detect paraquat via its one electron reduction process...
January 17, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29337577/preparation-of-nano-au-pt-alloy-microspheres-decorated-with-reduced-graphene-oxide-for-non-enzymatic-hydrogen-peroxide-sensing
#9
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/29337326/synthesis-characterization-and-derivatization-of-hydroxyl-functionalized-iron-ii-bis-nhc-complexes
#10
Anja C Lindhorst, Manuel Kaspar, Philipp J Altmann, Alexander Pöthig, Fritz E Kühn
The syntheses of a novel hydroxyl-functionalized tetradentate NHC/pyridine hybrid ligand and the corresponding Ag(i) and Fe(ii) complexes are presented. Spectroscopic and X-ray diffraction techniques are used for structural investigations and cyclic voltammetry measurements reveal interesting electronic properties. Transmetalation of the trinuclear Ag(i) complex (C1) yields a mononuclear and a dinuclear iron(ii) bis(NHC) complex (C2 and C3), which can be separated by stepwise precipitation. The former is isostructural to iron(ii) bis(NHC) complex A, which is a versatile oxidation catalyst...
January 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29337321/synthesis-spectroscopic-investigation-and-dft-study-of-n-n-disubstituted-ferrocene-based-thiourea-complexes-as-potent-anticancer-agents
#11
Faiza Asghar, Saira Fatima, Sadaf Rana, Amin Badshah, Ian S Butler, Muhammad Nawaz Tahir
In the present work, the synthesis, characterization (FT-IR, multinuclear (1H and 13C) NMR, AAS, Raman, and elemental analyses), DNA binding (cyclic voltammetry, UV-Vis spectroscopy), and in vitro biological screening of nine new ferrocene-incorporated thioureas (A1-A9) are reported. Furthermore, the single-crystal X-ray structure of compound A8 was also determined. The ferrocene-based N,N'-disubstituted thioureas were derived by allowing the ferrocenyl anilines to react with freshly prepared isothiocyanates under a N2 atmosphere in dry acetone...
January 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29336691/the-evaluation-of-cr-curcumin-dna-complexation-by-experimental-and-theoretical-approaches
#12
Farhad Ahmadi, Teymour Vahedpour, Ali Akbar Alizadeh
Chromium(III) chloride mediates DNA-DNA cross-linking. Some chromium complexes promote programmed cell death in specific ligand environment through binding to DNA. One strategy that can be supposed for reduction of Cr3+ binding affinity to DNA is using curcumin as a chelator. In the current study, the [Cr(Curcumin)(EtOH)2](NO3)2 (CCC) was synthesized and characterized by UV/Vis, FT-IR, CHN and spectrophotometric titration techniques. The mole ratio plot revealed a 1:1 complex between Cr3+ and curcumin in solution...
January 16, 2018: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/29336566/electrochemistry-of-bis-pyridine-cobalt-nitrophenyl-corroles-in-nonaqueous-media
#13
Xiaoqin Jiang, Mario L Naitana, Nicolas Desbois, Valentin Quesneau, Stéphane Brandès, Yoann Rousselin, Wenqian Shan, W Ryan Osterloh, Virginie Blondeau-Patissier, Claude P Gros, Karl M Kadish
A series of bis(pyridine)cobalt corroles with one or three nitrophenyl groups on the meso positions of the corrole macrocycle were synthesized and characterized as to their electrochemical and spectroscopic properties in dichloromethane, benzonitrile, and pyridine. The potentials for each electrode reaction were measured by cyclic voltammetry and the electron-transfer mechanisms evaluated by analysis of the electrochemical data combined with UV-visible spectra of the neutral, electroreduced, and electroxidized forms of the corroles...
January 16, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29336558/excited-state-processes-of-cyclometalated-platinum-ii-charge-transfer-dimers-bridged-by-hydroxypyridines
#14
Arnab Chakraborty, James E Yarnell, Roger D Sommer, Subhangi Roy, Felix N Castellano
A series of four anti-disposed dinuclear platinum(II) complexes featuring metal-metal-to-ligand charge-transfer (MMLCT) excited states, bridged by either 2-hydroxy-6-methylpyridine or 2-hydroxy-6-phenylpyridine and cyclometalated with 7,8-benzoquinoline or 2-phenylpyridine, are presented. The 2-hydroxypyridine bridging ligands control intramolecular d8-d8 metal-metal σ interactions, affecting the frontier orbitals' electronic structure, resulting in marked changes to the ground- and excited-state properties of these complexes...
January 16, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29336548/judicious-design-of-cationic-cyclometalated-ir-iii-complexes-for-photochemical-energy-conversion-and-optoelectronics
#15
Isaac N Mills, Jonathan A Porras, Stefan Bernhard
The exponential growth in published studies on phosphorescent metal complexes has been triggered by their utilization in optoelectronics, solar energy conversion, and biological labeling applications. Very recent breakthroughs in organic photoredox transformations have further increased the research efforts dedicated to discerning the inner workings and structure-property relationships of these chromophores. Initially, the principal focus was on the Ru(II)-tris-diimine complex family. However, the limited photostability and lack of luminescence tunability discovered in these complexes prompted a broadening of the research to include 5d transition metal ions...
January 16, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29335183/microwave-assisted-synthesis-of-palladium-nanoparticles-intercalated-nitrogen-doped-reduced-graphene-oxide-and-their-electrocatalytic-activity-for-direct-ethanol-fuel-cells
#16
Rajesh Kumar, Everson T S G da Silva, Rajesh K Singh, Raluca Savu, Andrei V Alaferdov, Leandro C Fonseca, Lory C Carossi, Arvind Singh, Sarita Khandka, Kamal K Kar, Oswaldo L Alves, Lauro T Kubota, Stanislav A Moshkalev
Palladium nanoparticles decorated reduced graphene oxide (Pd-rGO) and palladium nanoparticles intercalated inside nitrogen doped reduced graphene oxide (Pd-NrGO) hybrids have been synthesized by applying a very simple, fast and economic route using microwave-assisted in-situ reduction and exfoliation method. The Pd-NrGO hybrids materials show good activity as catalyst for ethanol electro oxidation for direct ethanol fuel cells (DEFCs) as compared to Pd-rGO hybrids. The enhanced direct ethanol fuel cell can serve as alternative to fossil fuels because it is renewable and environmentally-friendly with a high energy conversion efficiency and low pollutant emission...
January 8, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29332837/a-novel-electroanalytical-assay-for-sulfamethazine-determination-in-food-samples-based-on-conducting-polymer-nanocomposite-modified-electrodes
#17
Ya-Ling Su, Shu-Hua Cheng
The toxicity of sulfa drugs has attracted great attention, and the reported electrochemical methods for sulfa drugs usually employ a high oxidation potential. In this work, a one-pot synthesized conducting polymer nanocomposite containing poly(3,4-ethylenedioxythiophene) (PEDOT) and MnO2 was cast on a screen-printed carbon electrode (SPCE), and the modified electrode showed superior electrochemical activity over a bare electrode for sulfamethazine (SMZ) determination. The SMZ detection was based on the electrochemical oxidation product, which showed an adsorptive property and exhibited a redox couple at 0...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332806/defects-regulating-of-graphene-ink-for-electrochemical-determination-of-ascorbic-acid-dopamine-and-uric-acid
#18
Li Fu, Aiwu Wang, Guosong Lai, Weitao Su, François Malherbe, Jinhong Yu, Cheng-Te Lin, Aimin Yu
A simple water immersing treatment has been established for regulating the electrocatalytic activity of commercial graphene ink. This process enables to remove additives in graphene ink and consequently expose the surface defects. A graphene ink coated glass has been fabricated as an example platform for simultaneous determination of ascorbic acid (AA), dopamine (DA), and uric acid (UA). Cyclic voltammetry studied indicated electrocatalytic reaction can be initiated after the additives leaching during the water immersing treatment...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332802/total-%C3%AE-1-acid-glycoprotein-determination-in-serum-samples-using-disposable-screen-printed-electrodes-and-osmium-vi-as-electrochemical-tag
#19
Tania Sierra, María Cristina González, Begoña Moreno, Agustin G Crevillen, Alberto Escarpa
Alpha-1-acid glycoprotein (AGP) or Orosomucoid is a serum glycoprotein which belongs to the group of acute phase proteins. It is a potential biomarker for inflammatory bowel diseases. In this sense, there is a need for developing fast and cheap analytical methods for diagnosis, prognosis and follow-up of these diseases. In this work, we propose a simple and cheap electrochemical method for total AGP determination using disposable carbon screen-printed electrodes (SPE) and using a selective acidic precipitation of the rest of proteins...
April 1, 2018: Talanta
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
#20
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
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