Table 3. Contents of marker compounds in Petasites japonicus extracts depending on ethanol concentration and harvest time (mg/g, d.b.¹⁾)

Ethanol content (%)	Harvest time	Protocatechuic acid	Caffeic acid	3,5-DCQA	Bakkenolide B	Total
70	Apr.	0.87±0.00^2)f3)	1.01±0.01^c	1.57±0.01^e	11.39±0.13^c	14.85±0.14^c
	May	0.73±0.01^e	1.67±0.01^d	3.93±0.09^g	10.09±0.09^b	16.43±0.08^e
	Jun.	0.63±0.02^d	1.00±0.02^c	1.69±0.01^f	12.86±0.40^e	16.18±0.43^e
	Jul.	0.85±0.01^f	1.89±0.01^e	4.37±0.04^h	15.13±0.19^g	22.24±0.22^f
95	Apr.	0.35±0.00^c	0.34±0.00^a	0.81±0.04^b	12.37±0.10^d	13.87±0.14^b
	May	0.25±0.00^b	0.41±0.00^b	1.36±0.01^d	9.52±0.11^a	11.55±0.13^a
	Jun.	0.25±0.00^b	0.34±0.00^a	0.52±0.00^a	12.57±0.09^de	13.68±0.10^b
	Jul.	0.23±0.00^a	0.41±0.01^b	1.23±0.03^c	13.91±0.31^f	15.78±0.35^d

Dry basis.
All values are mean±SD (n=3).
Different superscript letters (^a-g) in the same column indicate significant differences by Duncan’s multiple range test (p<0.05).