Background: Due to the strong association between the chemistry of medicinal plants
and their biological properties, it is important to determine their phytochemical composition to
justify experimental tests.
Objective: The aim of this study was to evaluate the in vitro antioxidant and the enzyme inhibitory
properties and to identify the bioactive compounds present in the extracts of Ephedra nebrodensis
growing in Algeria.
Methods: Total phenolic and flavonoids content in these extracts were quantified by Folin-
Ciocalteu and aluminum chloride methods. The antioxidant capacity was assessed using DPPH,
ABTS, β-carotene/linoleic acid, CUPRAC and FRAP assays, and in vitro cholinesterase activity
against acetylcholinesterase and butyrylcholinesterase were evaluated. The chemical constituents
of the extracts were analyzed by high-performance liquid chromatography coupled with mass
spectrometric detection and gas chromatography. For the acute toxicity study, extracts were
administered to mice at single dose of 2 g/kg and 5 g/kg by gavage.
Results: Plant extracts were rich in phenolic compounds. Ethyl acetate extract presented the
highest phenolic (238.44 ± 1.50 μg GAE /mg of extract) and flavonoid (21.12 ± 0.00 μg QE /mg
of extract) contents. Likewise, ethyl acetate extract showed potent radical scavenging and reducing
properties. Ethanol-acetone extract showed inhibitory activity against acetylcholinesterase, and
was a potent inhibitor of butyrylcholinesterase. In all extracts, flavonoids were the most abundant
compounds. The phytochemical investigation showed the presence of alkaloids (ephedrine and
pseudo-ephedrine). In the acute toxicity, the LD50 was superior to 5 g/kg body weight. There were
no alterations in the histology of the liver and kidneys.
Conclusion: This study demonstrated a good antioxidant potential and anticholinesterase activity
of aerial parts of E. nebrodensis.