Table II.

Identification of the 11 Target Compounds by LC–ESI-MS

Compounds	Retention time (min)	Molecular weight	Parent ion (m/z)	Scan mode	Fragmentor (V)	Collision energy (V)	Product ion (m/z)
Geniposidic acid	6.4	374	373	−	115	15	210.9 [M−H-GlcR]−; 166.7 [M−H-GlcR-CO2]−; 149.0 [M−H-Glc-COOH]− 122.9 [M−H-GlcR-CO2-CH3CHO]−
Chlorogenic acid	15.9	354	353	−	105	8	190.9 [quinic acid-H]−
Caffeic acid	17.6	180	179	−	100	15	135 [M−H-CO2]−
Geniposide	22.2	404	411	+	162	31	249.3 [M+Na-GlcR]+; 231.0 [M+Na-Glc]+; 216.9 [M+Na-GlcR-CH3OH]+ 202.8 [Glc+Na]+
Luteoloside	33.1	448	447	−	228	26	284.9 [M−H-GlcR]−; 174.9 [M−H-GlcR-catechol]−; 151.1 [1,3A−]; 132.9 [1,3B−]
Isochlorogenic acid C	36.4	516	515	−	130	18	352.9 [M−H-Caffeoyl]−; 190.7 [quinic acid-H]−; 178.8 [caffeoyl-H]− 172.8 [quinic acid-H-H2O]−; 134.7 [caffeoyl-H-CO2]−
Baicalin	40.1	446	445	−	118	8	269.0 [M−H-GluAR]−; 174.7 [GluAR-H]−; 112.7 [GluAR-H-CO2-H2O]−
Luteolin	45.8	286	285	−	180	34	174.9 [M−H-catechol]−; 132.9 [1,3B−]; 131.6 [1,3B−-H]
Wogonoside	47.8	460	459	−	115	10	282.8 [M−H-GluAR]−; 267.9 [M−H-GluAR-CH3]−; 238.8 [M−H-GluA-CO]− 113.0 [GluA-H2O-H-CO2-H2O]−
Baicalein	56.1	270	269	−	165	31	222.7 [M−H-H2O-CO]−; 166.8 [1,3A−]; 138.7 [1,4A−]
Wogonin	67.6	284	283	−	115	15	268.0 [M−H-CH3]−; 162.8 [0,2A−-H2O]

GlcR, glucose residue; GluAR, glucuronic acid residues.