Table I.

List of identified flavonoids from Scutellaria baicalensis Georgi and quantification data.

Peak no.	Compound	Rt, min	MS [M-H]-	MS/MS	Quantity (mg/kg)
1	Pentahydroxyflavanone derivative	20.64	629	303, 285, 275, 217, 201, 177, 149, 125	174.844±4.017
2	Pentahydroxyflavanone	23.49	303	303, 285, 275, 259, 217, 193, 177, 149, 125, 109	14.833±0.167
3	Viscidulin I-O-diglucoside	25.98	625	301, 283, 273, 258, 229, 185, 151, 125	23.500±0.388
4	Pentahydroxyflavone	29.31	301	301, 283, 269, 259, 240, 191, 179, 161, 139, 124, 121, 109	14.448±0.059
5	Unidentified	34.65	647(+)	647, 501, 467, 347, 321, 303, 285	–
6	Viscidulin III-O-glucoside	35.22	507	345, 330, 315	–
7	Tetrahydroxyflavone	37.69	285	285, 268, 241, 217, 199, 177, 151, 133, 107	50.577±0.158
8	Iridin	40.20	521	383, 359, 344, 329, 313, 300, 285, 212	16.639±0.075
9	Eriodictyol (4′-hydroxynaringenin)	42.25	289(+)	289, 271, 247, 179, 163, 153, 147	23.509±0.244
10	Puerarin	43.24	415	415, 295, 267, 253, 223	6.665±0.045
11	Viscidulin III	43.88	347(+)	347, 332, 317, 314, 289, 286, 183, 169, 150, 142	–
12	Pentahydroxyflavone	45.11	301	301, 283, 269, 241, 225, 197, 179, 165, 161, 139, 133, 124, 107	16.108±0.541
13	Unidentified	52.55	675	675, 529, 481, 361, 335, 317, 285	–
14	Baicalin	53.67	447(+)	447, 343, 271, 253, 225, 169, 149, 123, 105	1.998±0.004
15	Scutellarein	56.25	285	285, 267, 257, 239, 213, 195, 185, 167, 165, 137, 119, 117	25.741±0.119
16	Isoscutellarein	57.35	285	285, 267, 257, 241, 239, 229, 213, 185, 167, 165, 137, 119, 117	7.143±0.025

Rt, retention time; MS, mass spectrometry; MS/MS, tandem MS.