Table 2 Optimized MS(n) condition for detection of phenylpropanoic acids and 4-hydrocinnaldehydes
Compound | Scan mode | Precursor ion | Collision energy (eV) | Product ion of SRM mode (MS2) |
|---|---|---|---|---|
p-Coumaric acid | − | 164 | 35 | 119 |
Caffeic acid | − | 180 | 34 | 135 |
Ferulic acid | − | 194 | 33 | 149, 178 |
p-Coumaraldehyde | + | 148 | 33 | 121, 131 |
Caffealdehyde | + | 164 | 32 | 147 |
Coniferaldehyde | + | 178 | 33 | 147, 161 |
Sinapaldehyde | + | 208 | 30 | 177, 191 |