3. Results and discussion
Initially we standardized the extracts by determining the content of flavonoids, and the sum of caffeic acid derivatives (caffeoyl glucarates and caffeoly quinic acids) and caffeic acid using HPLC method. This analysis revealed that the highest content of flavonoids was determined in G. parviflora ethanolic extract (685.4 ± 69.6 mg Q g−1), while the highest content of sum of caffeic acid derivatives and caffeic acid in G. parviflora aqueous extract (44.3 ± 2.7 mg ChA g−1) (The results of quantitative determinations are shown in Table 1). In the both species ethanolic extracts were characterized by the high amount of flavonoids (over than 60%), while in aqueous extracts the amount of flavonoids and the sum of caffeic acid derivatives and caffeic acid was similar (about 4%).