Phytochemical screening and antioxidant profile of leave decoctions of five wild edible plants from Côte d’Ivoire

This work is devoted to the phytochemical survey and the assessment of the antioxydant capacity of decoctions of 5 wild edible plants leaves (Amaranthus hybridus, Ipomea batatas, Basella alba, Talinum triangulare and Colocasia esculenta) from Côte d’Ivoire. Phytochemical characterization tests revealed the coexistence of polyphenols, flavonoids, tannins, saponins, leucoanthocyanes, steroids and terpenoids in the studied decoctions. The quantitative spectrophotometric assay of each decoction showed that the total polyphenol contents are higher with 1/100 (m/v) ratio for an optimum extraction’s time of about 60 min. For the similar ratio, B. alba, I. batatas, C. esculenta, A. hybridus and T. triangulare showed maximum contents in total phytophenols at different extraction times. The evaluation of the antioxidant activity of these decoctions for the ABTS test allowed to establish a linear correlation between their antioxidant capacity and their content of total phenolic secondary metabolites: T. triangulare (R2 = 0.98), A. hybridus (R2 = 0.93), B. alba (R2 = 0.83), I. batatas (R2 = 0.80) and C. esculenta (R2 = 0.42).