Table 7.

Quantification of flavonoids and their total content in the flowers of 3 Centaurea species extracted by 70% ethanol.

Species	Rutin, mg/L	Quercetin, mg/L	Hesperidin, mg/L	Total Phenolic Content a, mg GAE/l	Total Flavonoid Content b, mg Kv/l	Statistics c
Centaurea cyanus L.	13.2 ± 0.03	5.6 ± 0.01	13.2 ± 0.02	97.9 ± 1.15	118.52 ± 3.11	<0.001
Centaurea jacea L.	52.3 ± 1.72	11.9 ± 0.07	28.9 ± 0.23	163.7 ± 2.25	193.63 ± 2.67	0.001
Centaurea scabiosa L.	11.4 ± 0.19	3.4 ± 0.01	9.7 ± 0.03	91.3 ± 1.07	97.21 ± 1.00	<0.001

^a total phenolic content given as gallic acid equivalents (GAE). ^b total flavonoid content in terms of quercetin (Kv). ^c Statistical differences (p < 0.05) were assessed by applying a 2-tailed paired Student’s t-test.