Table 1.

The contents of eight medicinal active ingredients in roots of S. baicalensis with different growth years (mg/g).

Growth years	The contents of medicinal active ingredients (Dry weight, mg/g)
	Baicalin	Wogonoside	Baicalein	Wogonin	Scutellarin	Scutellarein	Apigenin	Chrysin
1-year-old	124.371 ± 0.135 h	22.037 ± 0.035 g	2.691 ± 0.004 g	0.642 ± 0.001 h	1.073 ± 0.003 a	0.017 ± 0.000 g	0.082 ± 0.001 b	0.223 ± 0.000 i
2-year-old	141.807 ± 0.415 d	28.408 ± 0.064 b	7.423 ± 0.020 c	2.584 ± 0.006 c	0.897 ± 0.006 b	0.088 ± 0.001 f	0.068 ± 0.000 c	0.624 ± 0.003 d
3-year-old	132.303 ± 0.342 f	27.795 ± 0.075 c	4.490 ± 0.012 f	1.904 ± 0.003 e	0.564 ± 0.005 d	0.174 ± 0.001 a	0.091 ± 0.001 a	0.397 ± 0.001 e
4-year-old	124.186 ± 0.218 i	21.261 ± 0.021 h	3.229 ± 0.005 h	1.101 ± 0.003 f	0.583 ± 0.005 c	0.140 ± 0.000 c	0.048 ± 0.001 d	0.312 ± 0.000 g
5-year-old	126.376 ± 0.303 g	20.800 ± 0.003 i	6.169 ± 0.004 d	3.107 ± 0.007 a	0.364 ± 0.006 g	0.131 ± 0.002 d	0.031 ± 0.001 e	0.765 ± 0.003 c
7-year-old	146.080 ± 0.152 c	26.989 ± 0.073 d	4.413 ± 0.011 h	1.029 ± 0.004 g	0.356 ± 0.011 g	0.134 ± 0.006 d	0.082 ± 0.001 b	0.269 ± 0.004 h
9-year-old	150.286 ± 0.480 b	24.020 ± 0.035 f	8.532 ± 0.009 a	2.734 ± 0.007 b	0.378 ± 0.005 f	0.131 ± 0.003 de	0.068 ± 0.000 c	0.806 ± 0.006 b
12-year-old	137.354 ± 0.170 e	29.263 ± 0.008 a	5.214 ± 0.004 e	2.521 ± 0.003 d	0.412 ± 0.001 e	0.129 ± 0.001 e	0.091 ± 0.001 a	0.335 ± 0.003 f
15-year-old	155.148 ± 0.301 a	24.272 ± 0.003 e	8.438 ± 0.003 b	2.522 ± 0.002 d	0.321 ± 0.002 h	0.143 ± 0.001 b	0.048 ± 0.001 d	0.832 ± 0.004 a

Note: Different letters indicate significant differences of the content of each medicinal active ingredient in the same column (P ≤ 0.05).