Screening of polyphenolic compounds from traditional medicinal herbs

screening of polyphenols by HPLC analysis. The results of screening of polyphenolic compounds obtained by RP-HPLC-DAD analysis
showed that flower of Anethum graveolens has 13-times greater total polyphenols content than its stalk. Flowers of dill were
characterized by the highest content of gallic acid (224.0 μg/g), epicatechin (199.5 μg/g), trans-caffeic acid (38.6 μg/g), trans-pcoumaric acid (76.1 μg/g), kaempferol (10.9 μg/g), and apigenin (49.4 μg/g) in comparison to other analyzed plants from celery family.
It was observed that in comparison to root (Apium graveolens var. rapaceum) and stalk (Apium graveolens var. dulce), leaves of Apium
graveolens var. rapaceum have higher content of polyphenols (∑ 2,755.0 μg/g). Celery leaves are primarily rich in chlorogenic acid
(1,790.2 μg/g), trans-ferulic acid (709.5 μg/g), and resveratrol (32.6 μg/g). Fruits of Tribulus terrestis were characterized by the highest
polyphenols content among all the analyzed plant materials (∑ 4,780.0 μg/g), followed by extract of Calendula officinalis (∑ 3,515.0
μg/g). The results of this study confirmed that oregano is a good source of trans-caffeic acid, trans-ferulic acid, and apigenin. Both types
of mint: Mentha piperita and Mentha longifolia were characterized by the smallest content of polyphenolic compounds among the
herbs. In comparison to mint, over 70% greater content of studied biologically active compounds were present in lavender (Lavendula
angustifolia) and sage (Salvia officinalis). In conclusion, the current study provided an experimental evidence that the extract from
Anethum graveolens flowers and Apium graveolens var. rapaceum leaves, and also Calendula officinalis and Tribulus terrestris, might
be promising candidates as health-promoting agents.