Table 1 Linear regression analysis of eleven standard flavonoids

Rutin

8.7

y = 12571.3x-16.62

0.9873

10-250

Myricetin

18.5

y = 9643.4x-11.07

0.9919

10-200

Vitexin

2.5

y = 23085.1x + 3.72

0.9932

10-100

Orientin

2.75

y = 36421.0x + 2.88

0.9869

25-500

Hyperoside

12.5

y = 22758.9x + 1.56

0.9865

10-250

Isovitexin

3.7

y = 31604.2x + 0.98

0.9741

5-150

Luteolin

2.01

y = 19348.6x + 2.08

0.9532

5-100

Isoquercetin

6

y = 26785.6x + 1.60

0.9616

5-500

Apigenin

4.7

y = 10623.5x-9.82

0.9765

25-250

Kaempherol

3.4

y = 26182.8x- + 2.33

0.9417

10-500

Luteolin-7-glucoside

1.6

y = 11434.6x-10.72

0.9536

5-100