New evidence of anthocyanins reduction in fruit juices on Pt electrode, and separate investigation of their oxidized and reduced forms

Bocharova, Oksana

doi:10.1007/s11694-018-0007-y

Cited by 2 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Along with diffusion from the bulk, a quick reach of the protic equilibrium can replenish the depleted deprotonated dye, while decreasing the amounts of the protonated species. These processes preclude the electrochemical detection of species with more positive potentials than the potential of the deprotonated forms that are the easiest to oxidize [ 64 , 65 ]. That is, the fast proton transfer rates during the potential sweeps result in voltammograms that appear as the oxidation of single species, as the observed patterns reveal ( Figure 3 ).…”

Section: Resultsmentioning

confidence: 99%

Photophysics and Electrochemistry of Biomimetic Pyranoflavyliums: What Can Bioinspiration from Red Wines Offer

et al. 2022

View full text Add to dashboard Cite

Natural dyes and pigments offer incomparable diversity of structures and functionalities, making them an excellent source of inspiration for the design and development of synthetic chromophores with a myriad of emerging properties. Formed during maturation of red wines, pyranoanthocyanins are electron-deficient cationic pyranoflavylium dyes with broad absorption in the visible spectral region and pronounced chemical and photostability. Herein, we survey the optical and electrochemical properties of synthetic pyranoflavylium dyes functionalized with different electron-donating and electron-withdrawing groups, which vary their reduction potentials over a range of about 400 mV. Despite their highly electron-deficient cores, the exploration of pyranoflavyliums as photosensitizers has been limited to the “classical” n-type dye-sensitized solar cells (DSSCs) where they act as electron donors. In light of their electrochemical and spectroscopic properties, however, these biomimetic synthetic dyes should prove to be immensely beneficial as chromophores in p-type DSSCs, where their ability to act as photooxidants, along with their pronounced photostability, can benefit key advances in solar-energy science and engineering.

show abstract

Section: Resultsmentioning

confidence: 99%

Photophysics and Electrochemistry of Biomimetic Pyranoflavyliums: What Can Bioinspiration from Red Wines Offer

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Modifications may include evaluating polarization curves before and after an electrochemical reduction (oxidation). The latter method was shown to be useful in determining the quantity of reduced (oxidized) anthocyanins in fruit juices …”

Section: Evaluation Of Reducing Power Of Antioxidants With An Oxidati...mentioning

confidence: 99%

“…Electrochemical methods give the opportunity to obtain the thermodynamic viability of redox reactions and the most important characteristics of a reducing power: a redox potential and quantities of oxidized and reduced forms of an antioxidant …”

Section: Evaluation Of Reducing Power Of Antioxidants With An Oxidati...mentioning

confidence: 99%

“…To use the volt-ampere method, orders of electrochemical reactions should be known . On the basis of the orders of redox reactions for anthocyanidin, it was established that the total content of anthocyanins, calculated as the content of cyanidin-galactoside, was 250.3 mg per 100 mL FW of aronia juice (100%), including 76.3 mg of reduced forms. As can be seen above, it is vital to know if redox substances contain any reduced forms; otherwise the reducing agent will not be able to reduce any redox compounds.…”

Section: Evaluation Of Reducing Power Of Antioxidants With An Oxidati...mentioning

confidence: 99%

“…New electrochemical data with respect to the mechanism of oxidation–reduction conversions of anthocyanins demonstrated the formation of semiquinones as anthocyanin radicals, which may help in clarifying the function of polyphenols, both as redox systems and as antiradical agents.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Electrochemical Basis for Re-evaluating Antioxidant Effect of Redox Substances in Foodstuffs

Bocharova

2022

ACS Food Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Differences in the mechanisms of in vitro antioxidant actions provide difficulties in evaluating antioxidant power and in choosing correct antioxidants for certain foodstuffs. In view of the reducing, antiradical, and pro-oxidant abilities of certain redox substances, an electrochemical approach was applied in this Review for re-evaluating antioxidant properties. The redox basis was discussed to provide a holistic view with respect to polyphenols acting both as reducing and antiradical agents. Quantitative (quantity of reduced forms) and qualitative (standard redox potential) constituents of reducing power were analyzed. Antioxidant vs pro-oxidant effects of polyphenols in foodstuffs were shown to rely upon the thermodynamic viability of redox reactions. It was demonstrated that the intermediate products of redox reactions of polyphenols (semiquinones) may act as antiradical agents. The article is based on previous works and outlines the further research for a practical application of electrical current in determining and improving the antioxidant capacity of foodstuffs.

show abstract

New evidence of anthocyanins reduction in fruit juices on Pt electrode, and separate investigation of their oxidized and reduced forms

Cited by 2 publications

References 14 publications

Photophysics and Electrochemistry of Biomimetic Pyranoflavyliums: What Can Bioinspiration from Red Wines Offer

Photophysics and Electrochemistry of Biomimetic Pyranoflavyliums: What Can Bioinspiration from Red Wines Offer

Electrochemical Basis for Re-evaluating Antioxidant Effect of Redox Substances in Foodstuffs

Contact Info

Product

Resources

About