Introduction: Polygonum convolvulus L. (black bindweed), syn. Fallopia convolvulus (L.) Á. Löve, Polygonaceae family is a plant from the spontaneous flora, spread from the plain zone up to the subalpine zone. The objectives of our researches are the qualitative and quantitative determination of polyphenolic compounds from Polygoni convolvuli herba and the choice of the adequate solvent for obtaining an active pharmacological extract.
Method: The qualitative exam consisted of phytochemical screening and thin layer chromatography. The quantitative determination of the total polyphenols was made through the Folin-Ciocâlteu method.
Results: The flavonoids, the anthocyanins, the tannins and the phenol carboxylic acids (phytochemical screening) were emphasized and the following compounds were identified: rutin, hyperoside, isoquercitroside, quercetin, myricetin, kaempferol and caffeic acid.
Conclusions: In order to establish the technological lab process for obtaining an active pharmacological extract standardized in total polyphenols the adequate solvent is ethanol 50% (v/v).