Table 1.
Summary of polarity and scan modes for lipid classes using ESI-MS/MSALL
| Lipid Classa | Polarity | Molecular Ion | MS/MS Scan Mode |
|---|---|---|---|
| PC | positive | M + H | Precursor ion of 184.1 |
| PE | positive | M + H | Neutral loss of 141.0 |
| SM | positive | M + H | Precursor ion of 184.1 |
| TAG | positive | M + NH4 | Neutral loss of FAb |
| DAG | positive | M + NH4 | Neutral loss of FA |
| Cer | positive | M + H | Precursor ion of 264.2 |
| AC | positive | M + H | Precursor ion of 85.0 |
| Glycolipid | positive | M + H | Precursor ion of 264.2 |
| PA | negative | M-H | Precursor ion of FA |
| PS | negative | M-H | Precursor ion of FA |
| PI | negative | M-H | Precursor ion of FA |
| PG | negative | M-H | Precursor ion of FA |
a PC phosphatidylcholine, PE phosphatidylethanolamine, PS phosphatidylserine, SM sphingomyelin, PI phosphatidylinositol, PG phosphatidylglycerol, PA phosphatidic acid, TAG triacylglyceride, DAG diacylglyceride, Cer ceramide, AC acylcarnitines, b FA fatty acid