Antioxidant activity of coumarins and flavonols from the resinous exudate of Haplopappus multifolius.

@article{Torres2006AntioxidantAO,
  title={Antioxidant activity of coumarins and flavonols from the resinous exudate of Haplopappus multifolius.},
  author={R. Torres and F. Faini and B. Modak and Francisco Urbina and C. Labb{\'e} and J. Guerrero},
  journal={Phytochemistry},
  year={2006},
  volume={67 10},
  pages={
          984-7
        }
}
The antioxidant activity of eight coumarins and two flavonols isolated from Haplopappus multifolius was studied with the DPPH radical method. Results show that a high concentration of phenolic coumarins and the presence of quercetin and rhamnetin in the exudates could account for the protection of the plant against oxidative stress. Structures for the coumarins 6-hydroxy-7-[(E,E)-3',7'-dimethyl-2',4',7'-octatrienyloxy] coumarin and 7-[(E)-3'-methyl-4'-hydroxy-2'-butenyloxy] coumarin are… Expand
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