Periploca angustifolia is a native shrub of Mediterranean regions. Multiple uses (ecological, pastoral and medicinal) of this species incited us to make a chemical phytoscreening of many secondary metabolites and biochemical analysis as well the anti-radical activity of three organs (twigs, root barks and seeds). The qualitative study revealed the presence of several secondary metabolites. Quantitative analysis shows that twigs and root barks are, respectively, a source of protein (5.204 mg.g-1DM) and fatty matter (5.2 mg.g-1DM). Secondary metabolites assays have shown that twigs of P. angustifolia have levels significantly (P <0.05) higher on total polyphenols and carotenoids, than the other two studied parts (root barks and seeds). On the other hand, seeds are very rich in tannins and anthocyanins. The flavonoid content is not significantly different (P> 0.05) between the different studied parts (twigs, root barks and seeds). To determine the effect of secondary metabolites (tannins, total polyphenols, flavonoids and anthocyanins) on anti-radical activity, a correlation was performed. This correlation is a logarithmic type of which the correlation coefficient (R2) varies depending on the compound. The correlation is very high (R2 = 0.939) for tannins. So what is, this compound, which is responsible for the anti-radical activity of Periploca angustifolia.
F. Dghim, S. Zouari, M. Boukhris, M. Neffati
Apocynaceae, Periploca angustifolia, chemical composition, antiradical activity, tannins