Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2754

Full Length Research Paper

Phytochemical study of the extracts of oilseeds of Staudtia kamerunensis var. gabonensis (Warb.) from Gabon and evaluation of their antiradical activity

Medza M’Ella Darina Livia
  • Medza M’Ella Darina Livia
  • Département de Phytochimie, Institut de Pharmacopée et Médecine Traditionnelle (IPHAMETRA), Centre National de la Recherche Scientifique et Technique (CENAREST), Libreville, Gabon.
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N’Negue ép Mezui-Mbeng Marie Andrée
  • N’Negue ép Mezui-Mbeng Marie Andrée
  • Laboratoire de Chimie-Biochimie de la Faculté de Médecine. Université des Sciences de la Santé, B.P. 4009 Libreville, Gabon.
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Edou Engonga Prosper
  • Edou Engonga Prosper
  • Ecole Normale Supérieure, Département des Sciences Physiques, Laboratoire Pluridisciplinaire des Sciences (LAPLUS), Avenue des Grandes Ecoles, BP: 17009, LBV/Gabon.
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Mengome Line Edwige
  • Mengome Line Edwige
  • Département de Phytochimie, Institut de Pharmacopée et Médecine Traditionnelle (IPHAMETRA), Centre National de la Recherche Scientifique et Technique (CENAREST), Libreville, Gabon.
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Engone Obiang Nestor
  • Engone Obiang Nestor
  • Département de Phytochimie, Institut de Pharmacopée et Médecine Traditionnelle (IPHAMETRA), Centre National de la Recherche Scientifique et Technique (CENAREST), Libreville, Gabon.
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Aboughe-Angone Sophie
  • Aboughe-Angone Sophie
  • Département de Phytochimie, Institut de Pharmacopée et Médecine Traditionnelle (IPHAMETRA), Centre National de la Recherche Scientifique et Technique (CENAREST), Libreville, Gabon.
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  •  Received: 20 December 2021
  •  Accepted: 25 February 2022
  •  Published: 30 June 2022

Abstract

The report focused on phytochemical tests and evaluation of the antiradical activity of seed extracts of Staudtia kamerunensis var. gabonensis. The successive extraction of seed powders from S. kamerunensis var. gabonensis was carried out by maceration at room temperature with solvents of increasing polarities: Cyclohexane, trichlorethylene, acetone, ethanol and distilled water. The antiradical activity was measured by trapping the radical cation of 2,2'-azinobis [3-ethylbenzothiazoline-6-sulfonic acid] (ABTS•+) with gallic acid as reference antioxidant. The total extraction yields were the order of 44.6%. Phytochemical tests demonstrated the presence of secondary metabolites of alkaloids, tannins, polyphenols types, reducing compounds, free anthracene derivatives, anthraquinones, total sugars, coumarins, free quinones, sterols and triterpenes, carotenoids, flavonoids, mucilages and traces of cardiac glycosides and saponins. The results of the anti-free radical activity showed that the polar extracts were much anti-free of the free radicals than the non-polar extracts. The ethanolic extract was the most active with an IC50 of 20 µgmL-1, followed by the aqueous and acetone extracts with IC50 of 25 µgmL-1. The cyclohexane and trichlorethylene extracts have lower antiradical activities with IC50 of 400 µgmL-1. Gallic acid, the reference antioxidant, showed an IC50 of 0.37 µgmL-1.

Key words: Staudtia kamerunensis var. gabonensis, oilseeds, extracts, phytochemical screening, antiradical activity, ABTS, gallic acid.