The influence of the host–guest interaction on the oxidation of natural flavonoid dyes

2011 ◽  
Vol 76 (12) ◽  
pp. 1651-1667 ◽  
Author(s):  
Šárka Ramešová ◽  
Romana Sokolová ◽  
Ilaria Degano ◽  
Magdaléna Hromadová ◽  
Miroslav Gál ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Inclusion Complex ◽  
Fluorescence Intensity ◽  
Oxidation Product ◽  
Aqueous Media ◽  
Electrochemical Methods ◽  
Redox Potentials ◽  
Decomposition Products ◽  
Degradation Processes ◽  
Bioorganic Compounds

The influence of the molecular cavity protection on degradation processes of bioorganic compounds quercetin and luteolin used as the original dyes in old tapestries was studied. The degradation processes were studied by electrochemical methods in aqueous media. The products of the exhaustive electrolysis were separated and identified by GC-MS analysis. Cyclic voltammetry characteristics indicate that the inclusion complex is formed. The inclusion affects the redox potentials of both oxidation waves related to the different dissociation forms of the flavonoid molecule. It was shown that decomposition products formed by the oxidation of quercetin are stabilized in the cavity of β-cyclodextrin, including the main oxidation product 2(3′,4′-dihydroxybenzoyl)-2,4,6-trihydroxybenzofuran-3(2H)-one. The formation of the 1:1 inclusion complex of luteolin with β-cyclodextrin is supported by the enhancement of fluorescence intensity. In the case of quercetin, a decrease of fluorescence intensity occurs when 1:1 inclusion complex with β-cyclodextrin is formed.

Physioelectrochemical investigation of the supercapacitive performance of a ternary nanocomposite by common electrochemical methods and fast Fourier transform voltammetry

2015 ◽  
Vol 39 (12) ◽  
pp. 9454-9460 ◽  
Author(s):  
Javad Shabani Shayeh ◽  
Ali Ehsani ◽  
Ayda Nikkar ◽  
Parviz Norouzi ◽  
Mohammad Reza Ganjali ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Fourier Transform ◽  
Fast Fourier Transform ◽  
Composite Electrode ◽  
Electrochemical Methods ◽  
New Technique ◽  
Supercapacitive Performance ◽  
Ternary Nanocomposite ◽  
A New Technique ◽  
Continuous Cyclic Voltammetry

Fast Fourier transform continuous cyclic voltammetry as a new technique for the explanation of a composite electrode for supercapacitors.

scholarly journals Preparation, characterization and featuring of an inclusion complex of nerol with β-cyclodextrin

2017 ◽  
Vol 5 (2) ◽  
pp. 195
Author(s):  
Mayara Coêlho ◽  
Herlane Da Silva ◽  
Muhammad Islam ◽  
Vicente Viana ◽  
Ana Amélia Melo-Cavalcante
Keyword(s):  
Inclusion Complex ◽  
Inclusion Complexes ◽  
Biological Activities ◽  
Aqueous Media ◽  
Limiting Factor ◽  
Thermo Gravimetric ◽  
Drug Molecules ◽  
Complex Cavity ◽  
Nonpolar Molecules ◽  
Low Solubility

Nerol is an acyclic type monoterpene with important biological activities. However, the low solubility in aqueous media is a limiting factor for its user. Cyclodextrins have been widely used in order to improve the solubility, stability and bioavailability of nonpolar molecules through the formation of inclusion complexes. Thus, the present study consists in the development of nerol inclusion complex in combination with the β-cyclodextrin (β-CD) followed by characterizing by thermal analysis and spectrophotometric absorption in the infrared (FTIR). The results suggest a complexation of nerol with β-CD having detours and changed the intensity of various bands. The thermo gravimetric curve of CI found to indicate an output of solvating water molecules from the complex cavity formed for replacement of drug molecules probably included. Thus, it is concluded a possibility to obtain inclusion complexes of nerol monoterpene with β-CD, which will increase its solubility and facilitate delivery process.

The effect of complex formation upon the redox potentials of metallic ions: Cyclic voltammetry experiments

1988 ◽  
Vol 65 (2) ◽  
pp. 173 ◽  
Author(s):  
Jorge G. Ibanez ◽  
Ignacio Gonzalez ◽  
Marco A. Cardenas
Keyword(s):  
Cyclic Voltammetry ◽  
Complex Formation ◽  
Redox Potentials ◽  
Metallic Ions

Interaction between Binuclear Copper(I) Complexes and the Dioxygen Molecule Investigated by Electrochemical Methods

1992 ◽  
Vol 47 (1) ◽  
pp. 109-114 ◽  
Author(s):  
Yuzo Nishida ◽  
Izumi Watanabe ◽  
Kei Unoura
Keyword(s):  
Cyclic Voltammetry ◽  
Thin Layer ◽  
Electrochemical Reduction ◽  
High Reactivity ◽  
Electrochemical Methods ◽  
Tridentate Ligand ◽  
Cyclic Voltammograms ◽  
Binuclear Copper ◽  
Alkyl Chains ◽  
Binucleating Ligands

The cyclic voltammograms of some binuclear copper(II) compounds with binucleating ligands where two molecules of tridentate ligand, N, N -bis(benzimidazol-2-ylmethyl)amine are linked by several alkyl chains, were measured under both argon and dioxygen. The results demonstrate that the binuclear copper(I) species produced by electrochemical reduction exhibit high reactivity towards dioxygen, while the reaction of the corresponding mononuclear species with oxygen is very slow. Thin-layer coulometry ([binuclear copper(I)]/[O2] = 0.47 - 10.6) and thin-layer cyclic voltammetry ([binuclear copper(I)]/[O2] = 4.3 - 10.6 ) revealed that two molecules of the binuclear copper(I) species react with one molecule of dioxygen.

Coordination polymers of 5-substituted 1,2,3,4-tetracyanocyclopentadienides: structural and electrochemical properties of complex compounds of 5-amino- and 5-nitro-tetracyanocyclopentadienide

2021 ◽  
Author(s):  
Patrick Nimax ◽  
Nils Rotthowe ◽  
Florian Zoller ◽  
Tobias Blockhaus ◽  
Friedrich Ernst Wagner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Mössbauer Spectroscopy ◽  
Electrochemical Properties ◽  
Coordination Polymers ◽  
Mossbauer Spectroscopy ◽  
Complex Compounds ◽  
Electrochemical Methods ◽  
Mößbauer Spectroscopy

Compounds of the 5-amino- (ATCC) and 5-nitro-1,2,3,4-tetracyanocyclopentadienide (NTCC) ligand with iron(II) and iron(III), silver(I) and potassium(I) were prepared and characterized by electrochemical methods using EPR, cyclic voltammetry and Mößbauer spectroscopy...

scholarly journals New insights into phenazine-based organic redox flow batteries by using high-throughput DFT modelling

2020 ◽  
Vol 4 (11) ◽  
pp. 5513-5521 ◽  
Author(s):  
Carlos de la Cruz ◽  
Antonio Molina ◽  
Nagaraj Patil ◽  
Edgar Ventosa ◽  
Rebeca Marcilla ◽  
...  
Keyword(s):  
Dft Calculations ◽  
High Throughput ◽  
Aqueous Media ◽  
Redox Potentials ◽  
Structure Property ◽  
Redox Flow Batteries ◽  
Structure Property Relationships ◽  
Flow Batteries ◽  
Dft Modelling ◽  
Interesting Structure

DFT calculations reveal interesting structure–property relationships of the redox potentials of phenazines in non-aqueous media.

Fluorimetric properties of a 2-hydroxypropyl-β-cyclodextrin: 9-methyl-benzo[a]phenothiazine inclusion complex in aqueous media. Analytical usefulness1

Talanta ◽  
1997 ◽  
Vol 44 (12) ◽  
pp. 2193-2199 ◽  
Author(s):  
Mounir Maafi ◽  
Maria Carmen Mahedero ◽  
Jean-Jacques Aaron
Keyword(s):  
Inclusion Complex ◽  
Aqueous Media

Electrochemical methods of hydrogen peroxide control in aqueous media under dynamic conditions

2016 ◽  
Vol 38 (2) ◽  
pp. 71-76
Author(s):  
E. D. Pershina ◽  
K. A. Kazdobin ◽  
A. A. Poliichuk ◽  
V. V. Kokhanenko
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Media ◽  
Electrochemical Methods ◽  
Dynamic Conditions
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