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Physico-chemical composition and antioxidant activity of three local cultivars of Hibiscus sabdariffa (Malvaceae) consumed in Congo

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Author Affiliations

  • 1Laboratoire de Physiologie et de production Végétales, Faculté des Sciences et Techniques, Université Marien NGOUABI BP 69 République du Congo
  • 2Laboratoire de Physiologie et de production Végétales, Faculté des Sciences et Techniques, Université Marien NGOUABI BP 69 République du Congo, Laboratoire de Biochimie, Ecole Normale Supérieure, Université Marien NGOUABI BP 69 République du Congo
  • 3Laboratoire de Valorisation des Plantes aromatiques, Alicamentaires et Médicales, Faculté des Sciences et Techniques, Université Marien NGOUABI BP 69 République du Congo
  • 4Laboratoire de Physiologie et de production Végétales, Faculté des Sciences et Techniques, Université Marien NGOUABI BP 69 République du Congo
  • 5Laboratoire de Physiologie et de production Végétales, Faculté des Sciences et Techniques, Université Marien NGOUABI BP 69 République du Congo

Res.J.chem.sci., Volume 7, Issue (2), Pages 34-41, February,18 (2017)

Abstract

Roselle (Hibiscus sabdariffa) is cultivated for its leaves, fibers, fruits and seeds. Its leaves are consumed fresh and cooked proved to be rich in micro-constituent exogenous antioxidants. This study was conducted to identify and to quantify the nourishing elements contents in leaves of Moussa 1, Moussa 2 and Poutou Poutou, local cultivars of Hibiscus sabdariffa. For dry powder of leaves, the aqueous content, total acidity and total sugars content was determined. Polyphenol and flavonoids were extracted from the aqueous, ethanolic and aqueous ethanolic solution and read on a spectrophotometer. The antioxidant and peroxidasic activity were measured with fresh leaves. The most significant total sugar contents is obtained at the cultivar Moussa 2 follow-up of Moussa 1 and Poutou Poutou. The local cultivars, Poutou Poutou are rich in polyphenols and flavonoids. The cultivar Poutou Poutou presented high percentages of polyphenols (10.30, 5.05 and 3.07 EAG/g.MS) and flavonoid (2.54, 1.4 and 0.84) respectively of the ethanolic, aqueous ethanolic and aqueous extracts compared to the cultivars Moussa 1 and Moussa 2. For three extraction solution, the ethanolic extract presents polyphenolic and flavonoids contents as well as antioxidant activity more significant compared with aqueous ethanolic extract. The cultivar Moussa 1 presents an antioxidant capacity very significant follow-up of Poutou Poutou and Moussa 2. The strong peroxidasic activity as well as acidity is recorded at the cultivar Moussa 1 compared to cultivars Poutou Poutou and Moussa 2.

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