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Title: 2,3-Diarylxanthones as strong scavengers of reactive oxygen and nitrogen species: a structure–activity relationship study
Authors: Santos, Clementina M.M.
Freitas, Marisa
Ribeiro, Daniela
Gomes, Ana
Silva, Artur
Cavaleiro, José
Fernandes, Eduarda
Keywords: 2,3-Diarylxanthones
Reactive oxygen species
Reactive nitrogen species
Scavenging activity
Antioxidant activity
Issue Date: 2010
Publisher: Elsevier
Citation: Santos, Clementina; Freitas, Marisa; Ribeiro, Daniela; Gomes, Ana; Silva, Artur; Cavaleiro, José; Fernandes, Eduarda (2010) - 2,3-Diarylxanthones as strong scavengers of reactive oxygen and nitrogen species: A structure–activity relationship study. Bioorganic & Medicinal Chemistry. ISSN 0968-0896. 18:18, p. 6776-6784
Abstract: Xanthones are a class of oxygen-containing heterocyclic compounds widely distributed in nature. The natural derivatives can present different substitutions in the xanthone core that include hydroxyl, methoxyl, prenyl and glycosyl groups. The inclusion of aryl groups has only been reported for a few synthetic derivatives, the 2,3-diaryl moiety being recently introduced by our group. Xanthones are endowed with a broad spectrum of biological activities, many of them related to their antioxidant ability, including the scavenging of reactive oxygen species (ROS) and reactive nitrogen species (RNS), as well as metal chelating effects. Considering the interesting and promising antioxidant activities present in compounds derived from the xanthone core, the main goal of this work was to evaluate the scavenging activity of the new 2,3-diarylxanthones for ROS, including superoxide radical (O2 ), hydrogen peroxide (H2O2), singlet oxygen (1O2), peroxyl radical (ROO ) and hypochlorous acid (HOCl), and RNS, including nitric oxide ( NO) and peroxynitrite anion (ONOO ). The obtained results revealed that the tested 2,3-diarylxanthones are endowed with outstanding ROS and RNS scavenging properties, considering the nanomolar to micromolar range of the IC50 values found. The xanthones with two catechol rings were the most potent scavengers of all tested ROS and RNS. In conclusion, the new 2,3-diarylxanthones are promising molecules to be used for their potential antioxidant properties.
Peer review: yes
ISSN: 0968-0896
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Appears in Collections:PTV - Artigos em Revistas Indexados ao ISI/Scopus

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