Table 2.

The partition coefficients (K) of the target compounds in several solvent systems.

Types of solvent system	Ratio (v/v)	Settling time (s)	K values
			Peak 5	Peak 6	Peak 7	Peak 8	Peak 9
n-Heptane-ethyl acetate-methanol-water	1 : 6 : 1 : 6	9	—	9.56	—	—	—
n-Hexane-ethyl acetate-methanol-water	1 : 3 : 1 : 3	13	—	—	—	35.34	—
n-Hexane-ethyl acetate-methanol-water	3 : 7 : 4.5 : 5.5	25	0.34	0.59	—	2.52	0.40
n-Hexane-ethyl acetate-methanol-water	2.5 : 7.5 : 5 : 5	23	0.37	0.57	1.01	2.04	0.33
n-Hexane-ethyl acetate-methanol-water	4 : 6 : 3.5 : 5.5	30	0.37	0.90	0.69	3.73	0.39
n-Hexane-ethyl acetate-methanol-water	4 : 6 : 2.5 : 7.5	28	3.91	4.62	—	15.01	3.39

Peak 5, piceatannol; peak 6, resveratrol; peak 7, daidzein; peak 8, genistein; peak 9, formononetin.