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Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy

Тип публикацииJournal Article
Дата публикации2021-12-15
scimago Q1
wos Q1
БС1
SJR0.918
CiteScore9.7
Impact factor4.9
ISSN20734360
General Chemistry
Polymers and Plastics
Краткое описание

Eumelanin is a widespread biomacromolecule pigment in the biosphere and has been widely investigated for numerous bioelectronics and energetic applications. Many of these applications depend on eumelanin’s ability to conduct proton current at various levels of hydration. The origin of this behavior is connected to a comproportionation reaction between oxidized and reduced monomer moieties and water. A hydration-dependent FTIR spectroscopic study on eumelanin is presented herein, which allows for the first time tracking the comproportionation reaction via the gradual increase of the overall aromaticity of melanin monomers in the course of hydration. We identified spectral features associated with the presence of specific “one and a half” C𝌁O bonds, typical for o-semiquinones. Signatures of semiquinone monomers with internal hydrogen bonds and that carboxylic groups, in contrast to semiquinones, begin to dissociate at the very beginning of melanin hydration were indicated. As such, we suggest a modification to the common hydration-dependent conductivity mechanism and propose that the conductivity at low hydration is dominated by carboxylic acid protons, whereas higher hydration levels manifest semiquinone protons.

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ГОСТ |
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Bedran Z. V. et al. Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy // Polymers. 2021. Vol. 13. No. 24. p. 4403.
ГОСТ со всеми авторами (до 50) Скопировать
Bedran Z. V., Zhukov S. S., Abramov P. A., Tyurenkov I. O., Gorshunov B., Mostert A. B., Motovilov K. A. Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy // Polymers. 2021. Vol. 13. No. 24. p. 4403.
RIS |
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TY - JOUR
DO - 10.3390/polym13244403
UR - https://doi.org/10.3390/polym13244403
TI - Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy
T2 - Polymers
AU - Bedran, Zakhar V
AU - Zhukov, Sergey S
AU - Abramov, Pavel A
AU - Tyurenkov, Ilya O
AU - Gorshunov, B.P.
AU - Mostert, A Bernardus
AU - Motovilov, Konstantin A
PY - 2021
DA - 2021/12/15
PB - MDPI
SP - 4403
IS - 24
VL - 13
PMID - 34960952
SN - 2073-4360
ER -
BibTex |
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BibTex (до 50 авторов) Скопировать
@article{2021_Bedran,
author = {Zakhar V Bedran and Sergey S Zhukov and Pavel A Abramov and Ilya O Tyurenkov and B.P. Gorshunov and A Bernardus Mostert and Konstantin A Motovilov},
title = {Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy},
journal = {Polymers},
year = {2021},
volume = {13},
publisher = {MDPI},
month = {dec},
url = {https://doi.org/10.3390/polym13244403},
number = {24},
pages = {4403},
doi = {10.3390/polym13244403}
}
MLA
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Bedran, Zakhar V., et al. “Water-Activated Semiquinone Formation and Carboxylic Acid Dissociation in Melanin Revealed by Infrared Spectroscopy.” Polymers, vol. 13, no. 24, Dec. 2021, p. 4403. https://doi.org/10.3390/polym13244403.