Carotenoids can act as antioxidants by oxidizing the superoxide radical anion.

@article{Galano2010CarotenoidsCA,
  title={Carotenoids can act as antioxidants by oxidizing the superoxide radical anion.},
  author={Annia Galano and Rubicelia Vargas and Ana Mart{\'i}nez},
  journal={Physical chemistry chemical physics : PCCP},
  year={2010},
  volume={12 1},
  pages={193-200}
}
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 O(2) (-) inverts the direction of the transfer, with respect to ET involving other ROS: the O(2) (-) becomes the electron donor and carotenoids (CAR) the electron acceptor. Therefore the "antioxidant" activity of CAR when reacting with O(2) (-) lies in their capacity to prevent the formation of oxidant ROS. This peculiar… CONTINUE READING

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