Table 2.

Total variance explained and component matrixes for the investigated compounds in S. miltiorrhiza.

Compound	Principal Components					Total
	1	2	3	4	5
Cryptotanshinone	0.939	0.119	−0.132	0.098	0.021	1.044
Tanshinone IIA	0.931	0.092	−0.084	0.077	0.159	1.175
Dihydrotanshinone I	0.908	0.021	−0.179	0.035	0.170	0.955
Tanshinone I	0.702	0.075	−0.298	0.110	0.279	0.869
Miltirone	0.700	0.055	0.000	0.204	−0.231	0.727
Danshensu	0.056	0.899	0.105	0.287	0.108	1.455
Salvianolic acid A	0.199	0.846	−0.257	0.226	0.152	1.166
Lithospermic acid	0.007	0.775	0.426	−0.282	0.031	0.957
Protocatechuic acid	0.185	0.609	−0.133	0.512	0.366	1.539
Rosmarinic acid	−0.299	−0.078	0.854	−0.128	−0.212	0.138
Salvianolic acid B	−0.053	0.818	0.768	−0.222	−0.212	1.099
Caffeic acid	−0.330	−0.136	0.656	0.291	0.344	0.826
Protocatechualdehyde	0.220	0.154	0.031	0.806	0.250	1.461
Isferulic acid	0.098	0.098	−0.120	0.747	−0.086	0.737
Ferulic acid	0.178	0.149	0.054	0.115	0.718	1.215
Cinnamic acid	0.010	0.088	−0.177	0.000	0.693	0.614
Explained variance (%)	33.896	18.533	11.459	7.699	6.686	78.274
Cumulative contributory ratio (%)	33.896	52.429	63.888	71.588	78.274	78.274