Number of found documents: 380
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Supported Phospholipid Bilayer at the Conductive Interface
Sokolová, Romana; Kocábová, Jana; Kolivoška, Viliam; Gál, M.
2017 - English
The interactions of ethanol and flavonoid compounds with supported phospholipid bilayer\nwere studied by means of electrochemical methods and scanning probe techniques. The\nstability of a 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) phospholipid bilayer\nsupported on different types of conductive substrate was investigated. The relationship\nbetween the method of lipid deposition and the formation of several types of lipid structures\nincluding vesicles, hemimicelles, patches and single bilayers on the interface is discussed. Keywords: Supported phospholipid bilayer; Ethanol; Atomic force microscopy Available at various institutes of the ASCR
Supported Phospholipid Bilayer at the Conductive Interface

The interactions of ethanol and flavonoid compounds with supported phospholipid bilayer\nwere studied by means of electrochemical methods and scanning probe techniques. The\nstability of a ...

Sokolová, Romana; Kocábová, Jana; Kolivoška, Viliam; Gál, M.
Ústav fyzikální chemie J. Heyrovského, 2017

Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation
Zlámalová, Magda; Janda, Pavel; Nesměrák, K.
2017 - English
This research is focused on the electrochemical synthesis and characterization of\npoly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane\nhighly oriented pyrolytic graphite (HOPG) and pencil graphite electrode (PGE), have been\nmodified by conductive film of pMB. Electrochemical properties and nanomorphological\nchanges have been investigated by cyclic voltammetry and atomic force microscopy.\nImproved electroactivity of the modified electrodes (PGE/pMB and HOPG/pMB) towards\nsulfhydryl group has been observed and examined modified electrodes were researched for\ntheir possible application in electrochemical sensor for hydrogen sulfide in aqueous solutions. Keywords: Atomic force misroscopy; Cyclic voltammetry; Electropolymerization Available at various institutes of the ASCR
Graphite Electrode Modified by Poly(Methylene Blue) and its Electrocatalytic Activity towards Hydrogen Sulfide Oxidation

This research is focused on the electrochemical synthesis and characterization of\npoly(methylene blue) (pMB). Two different carbon-based electrode substrates, basal plane\nhighly oriented pyrolytic ...

Zlámalová, Magda; Janda, Pavel; Nesměrák, K.
Ústav fyzikální chemie J. Heyrovského, 2017

Determination of the Rate of Tetraethylammoniumion Transfer across the\nWater/1,2-DCE Interface with Steady-State Voltammetry at a Nano-ITIES
Silver, Barry Richard; Holub, Karel; Mareček, Vladimír
2017 - English
The rate of TEA+ ion transfer across the water/1,2-dichloroethane interface has been\nmeasured using steady-state cyclic voltammetry at a capillary with an orifice of nano-sized\ndimension. It was found that the average rate constant for TEA+ transfer from water to oil and\nfrom oil to water is 0.64 cm/s. The results are repeatable using the same capillary. This value\nis similar to that measured previously using electrochemical impedance spectroscopy and\nfluctuation analysis at the micro-interface. Keywords: Ion transfer kinetics; Tetraethylammonium ion; Nanocapillary Available at various institutes of the ASCR
Determination of the Rate of Tetraethylammoniumion Transfer across the\nWater/1,2-DCE Interface with Steady-State Voltammetry at a Nano-ITIES

The rate of TEA+ ion transfer across the water/1,2-dichloroethane interface has been\nmeasured using steady-state cyclic voltammetry at a capillary with an orifice of nano-sized\ndimension. It was ...

Silver, Barry Richard; Holub, Karel; Mareček, Vladimír
Ústav fyzikální chemie J. Heyrovského, 2017

Charge Transport through Molecular Towers Based on Tetraphenylmethane Tripods
Kolivoška, Viliam; Šebera, Jakub; Lindner, M.; Valášek, M.; Mayor, M.; Mészáros, G.; Gasior, Jindřich; Hromadová, Magdaléna
2017 - English
Molecular platforms with multiple anchors were introduced recently to provide robust\ncoupling between molecular electronic components and metallic electrodes. In this work,\ncharge transport in tower-shaped single molecule conductors based on tetraphenylmethane\ntripod possessing three thiol anchors is investigated by scanning tunneling microscopy break\njunction technique. The effect of tripod substitution pattern and number of repeating units in\nmolecule is addressed. The substitution was found to influence conductance value in early\nstages of molecular junction evolution, where tower lays parallel to surface. In late stages, the\ncharge is transported through principal molecular axis and junction breaks thermally in tilted\nconfiguration. Keywords: Charge Transport Through Single Molecules; Break Junction Technique; Molecular Electronics Available at various institutes of the ASCR
Charge Transport through Molecular Towers Based on Tetraphenylmethane Tripods

Molecular platforms with multiple anchors were introduced recently to provide robust\ncoupling between molecular electronic components and metallic electrodes. In this work,\ncharge transport in ...

Kolivoška, Viliam; Šebera, Jakub; Lindner, M.; Valášek, M.; Mayor, M.; Mészáros, G.; Gasior, Jindřich; Hromadová, Magdaléna
Ústav fyzikální chemie J. Heyrovského, 2017

Miniaturized Boron Doped Diamond Film Electrode for Neuroblastoma Biomarkers Determination
Hrdlička, Voljtěch; Barek, J.; Navrátil, Tomáš; Taylor, Andrew
2017 - English
Cathodically pretreated miniaturized boron doped diamond film\nelectrode was successfully tested for the purposes of in-situ determination\nof neuroblastoma biomarkers after hollow-fibre based\nmicroextraction. Electrode was tested using K3[Fe(CN)6] and vanillylmandelic\nacid as model substances . Limits of detection and\ndetermination are 2.2 and 6.6 mu mol L-1, respectively. Linear range was\n2.2-100 mu mol L-1, repeatability 1.34% (n = 10). Keywords: biomarkers; boron doped diamond film; voltammetry Available at various institutes of the ASCR
Miniaturized Boron Doped Diamond Film Electrode for Neuroblastoma Biomarkers Determination

Cathodically pretreated miniaturized boron doped diamond film\nelectrode was successfully tested for the purposes of in-situ determination\nof neuroblastoma biomarkers after hollow-fibre ...

Hrdlička, Voljtěch; Barek, J.; Navrátil, Tomáš; Taylor, Andrew
Ústav fyzikální chemie J. Heyrovského, 2017

Pilot Experiments With a Micro-Volume Voltammetric Cell for the Determination of Electrochemically Reducible Organic Compounds
Skalová, Štěpánka; Barek, J.; Rodrigues, J. A.; Goncalves, L.M.; Navrátil, Tomáš; Vyskočil, V.
2017 - English
A new micro-volume voltammetric cell for analysis of small volumes\nof electrochemically reducible organic compounds was developed\nand tested. The sample (20-100 mu L) is placed in a narrow glass tube\nwith an agar membrane at the bottom and the working electrode is\nimmersed into the sample. The agar membrane, as anion permeable\nlayer, electrically connects the workin g e lectrode immersed in the\nanalysed sample in the glass tube with a large-volume compartment\n(20 mL) filled with Britton-Robinson buffer, where conventional nonminiaturized\nreference and auxiliary electrodes are placed. The system\nwas tested using a polished silver solid amalgam electrode\n(p-AgSAE) as a working electrode. Sodium anthraquinone-2-sulfonate\nwas used as a model compound because it is intended to use this\nsystem to monitor electrochemically reducible organic compounds. Keywords: agar membrane; micro-volume voltammetric cell; voltammetry Available at various institutes of the ASCR
Pilot Experiments With a Micro-Volume Voltammetric Cell for the Determination of Electrochemically Reducible Organic Compounds

A new micro-volume voltammetric cell for analysis of small volumes\nof electrochemically reducible organic compounds was developed\nand tested. The sample (20-100 mu L) is placed in a narrow glass ...

Skalová, Štěpánka; Barek, J.; Rodrigues, J. A.; Goncalves, L.M.; Navrátil, Tomáš; Vyskočil, V.
Ústav fyzikální chemie J. Heyrovského, 2017

Stereoelectrochemistry of Calixarenes
Liška, Alan; Ludvík, Jiří; Vojtíšek, P.
2017 - English
The relationship between the stereochemical properties (shape or molecular geometry in\ngeneral sense) and electrochemical ones (typically number of separate redox proceses, their\nnature and potentials) is very fundamental, however, not easily answerable. The nitro\nsubstituted calix[4]arenes appeared to be suitable series of compounds enabling correlation of\nelectrochemical data (redox potential, current, reversibility) with actual shape, conformation\nand dynamic behavior of the molecules dissolved in solution due to their well defined\ngeometry and clear polarographic and voltammetric response. Electrochemical methods can\nbe therefore used as a straightforward alternative to e.g. temperature dependent NMR\nspectroscopy. The present contribution is focused on thiacalix[4]arenes, their similarities and\ndistinctions from their methylene bridged analogues.\n Keywords: Calixarenes; Thiacalixarenes; Stereoelectrochemistry Available at various institutes of the ASCR
Stereoelectrochemistry of Calixarenes

The relationship between the stereochemical properties (shape or molecular geometry in\ngeneral sense) and electrochemical ones (typically number of separate redox proceses, their\nnature and ...

Liška, Alan; Ludvík, Jiří; Vojtíšek, P.
Ústav fyzikální chemie J. Heyrovského, 2017

Single Molecule Conductance and Junction Formation in Solution. Solvent Effect
Lachmanová, Štěpánka; Šebera, Jakub; Gasior, Jindřich; Dupeyre, G.; Lainé, P. P.; Mészáros, G.; Hromadová, Magdaléna
2017 - English
The single molecule conductance of expanded pyridinium derivative terminated by pyridyl\nnitrogen as an anchoring group at both ends of the molecule in two different environments\nwas measured by scanning tunneling microscopy break junction technique (STM-BJ). The\nvalues obtained in commonly used 1,3,5-trimethylbenzene (TMB) significantly differ from\nthe values acquired in a mixture of TMB and ethanol. Markedly lower junction length and\nhigher conductance indicate strong influence of adsorption of the molecule to the substrate\nsurface in pure TMB compared to the TMB and ethanol mixture. Keywords: Single molecule conductance; Expanded pyridinium derivatives; Solvent effect Available at various institutes of the ASCR
Single Molecule Conductance and Junction Formation in Solution. Solvent Effect

The single molecule conductance of expanded pyridinium derivative terminated by pyridyl\nnitrogen as an anchoring group at both ends of the molecule in two different environments\nwas measured by ...

Lachmanová, Štěpánka; Šebera, Jakub; Gasior, Jindřich; Dupeyre, G.; Lainé, P. P.; Mészáros, G.; Hromadová, Magdaléna
Ústav fyzikální chemie J. Heyrovského, 2017

Electrochemical biosensors with flow-through enzymatic reactors
Josypčuk, Oksana; Josypčuk, Bohdan
2017 - English
Twelve enzymatic biosensors with various silica powder reactors were fabricated and tested.\nExperiments with six silica materials showed that mesoporous silica SBA-15 was the best one\nin terms of covering by enzymes, sensitivity and lifetime of biosensors. The current response\nof the SBA15-glucose oxidase (GOx) sensor started to decrease only after 200-day testing.\nThe used amalgam tubular detector in a flow system allowed working at highly negative\npotentials. Statistical results of parallel measurements of model solutions with the fabricated\nbiosensors show their high accuracy and sensitivity. The proposed SBA15-GOx biosensor\nwas used for determination of glucose in commercial honey. Keywords: Biosensor; Amperometry; Enzymatic reactor Available at various institutes of the ASCR
Electrochemical biosensors with flow-through enzymatic reactors

Twelve enzymatic biosensors with various silica powder reactors were fabricated and tested.\nExperiments with six silica materials showed that mesoporous silica SBA-15 was the best one\nin terms of ...

Josypčuk, Oksana; Josypčuk, Bohdan
Ústav fyzikální chemie J. Heyrovského, 2017

Voltammetric Determination of Tumor Biomarkers using Flow Injection Analysis with Amperometric Detection
Makrlíková, Anna; Matysik, F.-M.; Barek, J.; Vyskočil, V.
2017 - English
Three tumor biomarkers (homovanillic acid, vanillylmandelic acid,\nand 5-hydroxyindole-3-acetic acid) have been determined by flow\ninjection analysis with amperometric detection at screen-printed\ncarbon electrodes in optimum medium of Britton-Robinson buffer\n(0.04 mol l-1, pH = 2.0). Dependences of the peaks current on the\nconcentration of biomarkers were linear in the tested concentration\nregion from 0.05 to 100 mu mol l-1, with the limits of detection of\n0.065 mu mol l-1 for homovanillic acid, 0.053 mu mol l-1 for vanillylmandelic\nacid, and 0.033 mu mol l-1 for 5-hydroxyindole-3-acetic acid (calculated\nfrom heights), and 0.024 mu mol 1-1 for homovanillic acid,\n0.020 mu mol l-1 forvanillylmandelic acid, and 0.012 mu mol l-1 for 5-hydroxyindole-3-acetic acid (calculated from areas), respectively. Keywords: flow injection analysis; 5-hydroxyindole-3-acetic acid; homovanillic acid Available at various institutes of the ASCR
Voltammetric Determination of Tumor Biomarkers using Flow Injection Analysis with Amperometric Detection

Three tumor biomarkers (homovanillic acid, vanillylmandelic acid,\nand 5-hydroxyindole-3-acetic acid) have been determined by flow\ninjection analysis with amperometric detection at ...

Makrlíková, Anna; Matysik, F.-M.; Barek, J.; Vyskočil, V.
Ústav fyzikální chemie J. Heyrovského, 2017

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