Marker compounds | tR (min)-m/z | Ions | VIP | Formula (neutral form) | MS/MS fragments | Identification |
---|---|---|---|---|---|---|
a | 43.54–297a | [M+H]+ | 2.63 | C19H20O3 | 279, 264, 251, 223, 208 | Cryptotanshinone |
43.36–615a | [2M+Na]+ | 3.67 | ||||
b | 40.89–277a | [M+H]+ | 2.74 | C18H12O3 | 259, 249, 231, 221, 206, 193, 178 | Tanshinone I |
40.87–575b | [2M+Na]+ | |||||
c | 32.82–279b | [M+H]+ | C18H14O3 | 218, 205, 190 | Dihydrotanshinone I | |
32.94–579a | [2M+Na]+ | 1.57 | ||||
d | 52.17–295a | [M+H]+ | 1.28 | C19H18O3 | 277, 262, 249, 234, 221, 206, 191 | Tanshinone IIA |
51.45–296a | Isotope peak of [M+H]+ | 2.62 | ||||
51.74–317b | [M+Na]+ | |||||
51.84–611a | [2M+Na]+ | 3.60 |