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Background  The aim of our research work was to quantify total flavonoid contents in the leaves of 13 plant species family  Asteraceae , 8 representatives of family  Lamiaceae  and 9 plant species belonging to family  Rosaceae , using the multiplex fluorimetric sensor. Fluorescence was measured using optical fluorescence apparatus Multiplex(R) 3 (Force-A, France) for non-destructive flavonoids estimation. The content of total flavonoids was estimated by FLAV index (expressed in relative units), that is deduced from flavonoids UV absorbing properties.    Results  Among observed plant species, the highest amount of total flavonoids has been found in leaves of  Helianthus multiflorus  (1.65 RU) and  Echinops ritro  (1.27 RU), Rudbeckia fulgida (1.13 RU) belonging to the family  Asteraceae . Lowest flavonoid content has been observed in the leaves of marigold ( Calendula officinalis ) (0.14 RU) also belonging to family  Asteraceae . The highest content of flavonoids among experimental plants of family  Rosaceae  has been estimated in the leaves of  Rosa canina  (1.18 RU) and among plant species of family  Lamiaceae  in the leaves of  Coleus blumei  (0.90 RU).    Conclusions  This research work was done as pre-screening of flavonoids content in the leaves of plant species belonging to family  Asteraceae, Lamiaceae  and  Rosaceae . Results indicated that statistically significant differences (P > 0.05) in flavonoids content were observed not only between families, but also among individual plant species within one family.

The application of multiplex fluorimetric sensor for the analysis of flavonoids content in the medicinal herbs family Asteraceae, Lamiaceae, Rosaceae