PHYTOCHEMICAL SCREENING AND ANTIOXIDANT ACTIVITIES OF COLA NITIDA (VENT.) SCHOTT & ENDL STEM BARK (MALVACEAE) AND PALISOTA HIRSUTA (THUNB.) K.SCHUM. EX ENGL LEAVES (COMMELINACEAE): TWO PLANTS USED AS CHILDBIRTH AIDS IN THE AYAMÉ SUB-PREFECTURE (SOUTH-EAST
*Bohi Ablegue Georges, Kouamé N'dri Marie Thérèse, Yao Kouassi Cesar, Kouamé Koa Anderson
ABSTRACT
The traditional use of Palisota hirsuta (Thunb.) K.Schum. ex Engl (Commelinaceae) leaves and stem bark of Cola nitida (Vent.) Schott & Endl (Malvaceae) by the local population of Ayamé Sub-prefecture as a chilbirth facilitator prompted us investigate the biological and phythochemical properties of these two plants. The phytochemical screening of the aqueous and hydroalcoholic extracts of both plants revealed the presence of polyphenols, alkaloids, flavonoids, tannins, reducing sugars, terpene steroids and cardiotonic heterosides. But also the presence of saponosides in aqueous extracts of Palisota hirsuta leaves. Quantitative spectrophotometric analysis of total polyphenols (PH 262,17 24,64 mg EAG/g MS ; CN 50,163,11 mg EAG/g MS), total flavonoids (PH 40,97 5,06 mg EQ / g MS ; CN 46,87 1,96 mg EQ / g MS) and condensed tannins (PH 373,09 39,25 mgEC/g MS ; CN 45,66 3,82 mgEC/g MS) showed variable levels. The best antioxidant activity was obtained with hydroalcoholic extracts (CI50= 0,035 mg/mL) of Palisota hirsuta leaves. The antioxydant power of the extracts was assessed by the DPPH radical scavenging method and the positive reference control was vitamin C. These results suggest a possible self-medication by the pregnant women.
Keywords: Chilbirth facilitator, phytochemical screening, antioxidant activity, medicinal plants.
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