Carotenoids can act as antioxidants by oxidizing the superoxideradical anion

Literature Information

Publication Date 2009-11-06
DOI 10.1039/B917636E
Impact Factor 3.676
Authors

Annia Galano, Ana Martínez


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Abstract

The electron transfer (ET) reaction between carotenoids and the superoxide radical anion is found to be not only a viable process but also a very unique one. The nature of the O2˙− inverts the direction of the transfer, with respect to ET involving other ROS: the O2˙− becomes the electron donor and carotenoids (CAR) the electron acceptor. Therefore the “antioxidant” activity of CAR when reacting with O2˙− lies in their capacity to prevent the formation of oxidant ROS. This peculiar charge transfer is energetically feasible in non-polar environments but not in polar media. In addition the relative reactivity of CAR towards O2˙− is drastically different from their reactivity to other ROS. Asthaxanthin (ASTA) is predicted to be a better O2˙− quencher than LYC and the other CAR. The CAR + O2˙− reactions were found to be diffusion controlled. The agreement with available experimental data supports the density functional theory results from the present work.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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