Synthesis and in vitro antioxidant activity of glycyrrhetinic acid derivatives tested with the cytochrome P450/NADPH system

Mourboul Ablise, Brigitte Leininger-Muller, Choi Dal Wong, Gérard Siest, Vincent Loppinet, Sophie Visvikis

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31 Citations (Scopus)


Five glycyrrhetinic acid (Ib) derivatives have been synthesized to try to improve the antioxidant activity. Their in vitro antioxidant activities were studied using a cytochrome P450/NADPH reductase system from rat liver microsomes. The generation of microsomal free radicals was followed by oxidation of the DCFH-DA probe, while evaluating the capacity to inhibit reactive oxygen species (ROS) formation. Two hydroxylated derivatives, 18β-olean-12-ene- 3β,11α,30-triol (II) and 18β-olean-12-ene-3β,11β,30- triol (IV), exhibited strong antioxidant activities. At a concentration of 1.0 mg/ml, these derivatives inhibited ROS formation by 50% and 51%, respectively. Moreover, two homo- and heterocyclic diene derivatives, 18β-olean-11,13(18) -diene-3β,30-diol (III) and 18β-olean-9(11),12-diene-3β,30-diol (V), were also effective in ROS-scavenging activity (inhibition of 41% and 44% of ROS activity, respectively). In the same conditions, the lead compound (Ib) and the reference vitamin E inhibited ROS activity by 31% and 32%, respectively. Our results suggest that the chemical reduction of the 11-keto and 30-carboxyl groups into hydroxyl function (example, II, IV) can increase the antioxidant activity of Ib significantly. In view of these results, our study represents a further approach to the development of potential therapeutic agents from Ib derivatives for use in pathologic events in which, free radical damage could be involved.

Original languageEnglish
Pages (from-to)1436-1439
Number of pages4
JournalChemical and Pharmaceutical Bulletin
Issue number12
Publication statusPublished - 2004 Dec


  • Antioxidant activity
  • Cytochrome P450/NADPH reductase
  • Glycyrrhetinic acid derivative

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery


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