Published Online: March 10, 2023 ISSN: 2684-4478 DOI: 10.24018/ejchem.2023.4.2.129 P. A. Ranaivoson* Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: adrien_ranaivoson yahoo.fr) @ J. V. Rakotoarimanga Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: jv.rakotoarimanga gmail.com) @ J. E. R. Lantovololona Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: lantovololona gmail.com) @ C. Andriamiadamanana Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: chriast yahoo.fr) @ R. Randrianasolo Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: rivoaris17 yahoo.fr) @ A. Ramahazomanana Valorization of natural and renewable resources, Faculty of Sciences and Technology, University of Antananarivo, Madagascar (e-mail: alhisonram20 gmail.com) @ *Corresponding Author

Pauridiantha paucinervis var. Lyalli (Rubiaceae)[1][2] is a plant abounding in alkaloid compounds[3] of which the quinoline derivatives are the majority. An alkaloid quinoline has been isolated for the first time of this plant. The chemical formula of this compound is C26H30N2O9 while its mass is M = 514. This plant can be found and bought everywhere at the markets and at the herbalists on the island. It is a widely known plant of the Malagasy traditional medicine. The structure has been clarified by analyses of its NMR 1D and 2D as well as ESI-MS (coupled with HPLC) spectral data. The test with the DDPH reagent on a thin layer of silica gel chromatogram revealed that the isolated substance has antioxidant activity [4]-[8]. Keywords: Antioxidant, ESI-MS, NMR, Pauridiantha, Quinoline, Rubiaceae.